Details of the Researcher

PHOTO

Yuji Saito
Section
Frontier Research Institute for Interdisciplinary Sciences
Job title
Associate Professor
Degree

  • 博士（工学）（北海道大学）

  • 修士（工学）（北海道大学）

Research History 10

  • 2025/05 - Present
    Distinguished Researchers of Tohoku University

  • 2025/04 - Present
    Tohoku University　Frontier Research Institute for Interdisciplinary Sciences　Associate Professor

  • 2024/01 - Present
    Tohoku University　Green Goals Initiative (concurrent)

  • 2021/07 - Present
    東北大学プロミネントリサーチフェロー

  • 2021/04 - 2025/03
    Tohoku University　Institute of Fluid Science (concurrent)

  • 2021/04 - 2025/03
    Tohoku University　Frontier Research Institute for Interdisciplinary Sciences, Creative Interdisciplinary Research Division　Assistant professor

  • 2019/01 - 2021/03
    Tohoku University　Graduate School of Engineering　Assistant Professor

  • 2018/04 - 2018/12
    The University of Tokyo　Graduate School of Frontier Sciences　Project Researcher

  • 2017/04 - 2018/03
    Hokkaido University　Graduate School of Engineering　Research Fellowship for Young Scientists

  • 2017/11 - 2017/12
    The Sapienza, University of Rome　Research Intern

Show all Show first 5

Education 4

  • Hokkaido University　Graduate School of Engineeering

    2016/04 - 2018/03

  • Hokkaido University　Graduate School of Engineering

    2014/04 - 2016/03

  • Hokkaido University　Faculty of Engineering

    2012/04 - 2014/03

  • 国立沼津工業高等専門学校　機械工学科

    2007/04 - 2012/03

Committee Memberships 3

  • 宇宙工学委員会　研究メンバ

    2024/06 - Present

  • 日本航空宇宙学会　北部支部幹事

    2024/04 - Present

  • International Astronautical Federation (IAF)　Space Propulsion Committee

    2023/04 - Present

Professional Memberships 4

  • Combustion Society of Japan

    2021/05 - Present

  • AIAA

  • THE JAPAN SOCIETY OF MECHANICAL ENGINEERS

  • THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES

Research Interests 2

  • Space propulsion

  • Hybrid rocket

Research Areas 1

  • Aerospace, marine, and maritime Engineering / Aerospace engineering /

Awards 12

  1. The Young Scientists’ Award

    2025/04　Ministry of Education, Culture, Sports, Science and Technology

  2. 第16回宇宙科学奨励賞

    2024/03　Society for Promotion of Space Science

  3. 2018 AIAA Hybrid Rockets Best Paper

    2019/08　American Institute of Aeronautics and Astronautics　Investigation of Graphite Nozzle Erosion in Hybrid Rockets Using O2/C2H4

  4. Young Researcher Award

    2019/04　The Japan Society for Aeronautical and Space Sciences

  5. 2016 AIAA Best Hybrid Rockets Student Paper

    2017/07　American Institute of Aeronautics and Astronautics　Experimental and Analytical Investigation of Effect of Pressure on Regression Rate of Axial-Injection End-Burning Hybrid Rockets

  6. 第35回（令和6年度）トーキン科学技術賞

    2025/03　トーキン科学技術振興財団　革新的ハイブリッドロケットの推進性能解明と実用化研究

  7. 学会賞（論文賞）

    2022/08

  8. 第 7 回東北大学若手アンサンブルワークショップ優秀ポスター賞

    2021/05　東北大学附置研究所若手アンサンブルプロジェクト　アルミニウムと水燃焼による革新的宇宙推進システム実現に向けて

  9. 第48回日本航空宇宙学会年会講演会 優秀発表賞

    2017/04　日本航空宇宙学会

  10. Good Presentation Award for Student

    2016/03

  11. The Second Prize -International Students Symposium and Competition-

    2014/05　14th International Space Conference of Pacific-basin Societies

  12. 畠山賞

    2012/03　日本機械学会

Show all ︎Show 5

Papers 53

  1. Anomaly Detection using Data-driven Sparse Sensors: Combination of Modal Representation and Sensor Optimization for Sensing of Targeted Variable International-journal Peer-reviewed

    Yuji Saito, Ryoma Inoba, Yasuo Sasaki, Takayuki Nagata, Keigo Yamada, Taku Nonomura

    IEEE Sensors Letters　1-4　2025/07/21

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/lsens.2025.3591066 　

    eISSN： 2475-1472

  2. Simplified Data-Reduction Method for Hybrid Propulsion International-journal Peer-reviewed

    Yuji Saito, Shota Kameyama, Toshinori Kuwahara

    Journal of Propulsion and Power　40　(3)　490-496　2024/05

    Publisher: American Institute of Aeronautics and Astronautics (AIAA)

    DOI： 10.2514/1.b39387 　

    ISSN： 0748-4658

    eISSN： 1533-3876

  3. Sensor Selection with Cost Function using Nondominated-Solution-based Multi-objective Greedy Method International-journal Peer-reviewed

    Yuji Saito, Kumi Nakai, Takayuki Nagata, Keigo Yamada, Taku Nonomura, Kazuki Sakaki, Yoshio Nunome

    IEEE Sensors Journal　23　(24)　31006-31016　2023/12/14

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/jsen.2023.3328005 　

    ISSN： 1530-437X

    eISSN： 1558-1748 2379-9153

  4. High Pressure Fuel Regression Characteristics of Axial-Injection End-Burning Hybrid Rockets International-journal Peer-reviewed

    Yuji Saito, Masaya Kimino, Ayumu Tsuji, Yushi Okutani, Kentaro Soeda, Harunori Nagata

    Journal of Propulsion and Power　35　(2)　328-341　2019/03

    DOI： 10.2514/1.B37135 　

    ISSN： 0748-4658

    eISSN： 1533-3876

  5. Fuel Regression Characteristics of a Novel Axial-Injection End-Burning Hybrid Rocket Peer-reviewed

    Yuji Saito, Toshiki Yokoi, Hiroyuki Yasukochi, Kentaro Soeda, Tsuyoshi Totani, Masashi Wakita, Harunori Nagata

    Journal of Propulsion and Power　34　(1)　247-259　2018/01

    DOI： 10.2514/1.B36369 　

    ISSN： 0748-4658

    eISSN： 1533-3876

  6. Fast Data-Driven Greedy Sensor Selection for Ridge Regression International-journal Peer-reviewed

    Yasuo Sasaki, Keigo Yamada, Takayuki Nagata, Yuji Saito, Taku Nonomura

    IEEE Sensors Journal　25　(6)　10030-10045　2025/03/15

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/jsen.2025.3537702 　

    ISSN： 1530-437X

    eISSN： 1558-1748 2379-9153

  7. Simulation Evaluation of Re-entry Control Technique for Small Satellite ELS-R100 International-journal Peer-reviewed

    Takumi Saito, Toshinori Kuwahara, Yuta Ishihara, Shinya Fujita, Yuji Saito, Nobuo Sugimura, Yuji Saito, Kasumi Nakura

    Journal of Evolving Space Activities　2　1-9　2025/02

    DOI： 10.57350/jesa.216 　

  8. Guidance strategies for controlled Earth reentry of small spacecraft in low Earth orbit International-journal Peer-reviewed

    Takumi Saito, Toshinori Kuwahara, Yuji Saito, Yuji Sato

    Acta Astronautica　2024/12/26

    Publisher: Elsevier BV

    DOI： 10.1016/j.actaastro.2024.12.054 　

    ISSN： 0094-5765

  9. Aerodynamic Characteristics of Magnetically Suspended Square Cylinders with Low Fineness Ratio International-journal Peer-reviewed

    Hiroyuki Okuizumi, Rintaro Makino, Masatoshi Horiguchi, Yuji Saito, Hideo Sawada, Yasufumi Konishi, Shigeru Obayashi, Keisuke Asai, Taku Nonomura

    Journal of Aircraft　1-7　2024/12/08

    Publisher: American Institute of Aeronautics and Astronautics (AIAA)

    DOI： 10.2514/1.c038102 　

    ISSN： 0021-8669

    eISSN： 1533-3868

    More details Close

    It is common that bluff bodies form complex wake structures and act on themselves with significant influence on aerodynamic forces. A square cylinder was studied as a typical model that makes complex flowfields. A magnetic suspension and balance system (MSBS) was used to support the model with magnetic forces and eliminate the influence of mechanical supports on the flowfield of wind-tunnel testing. The aerodynamic forces and base pressure of the square cylinder models with fineness ratios (L/D) of 1.0, 1.2, 1.68, and 2.0 were measured using the MSBS. The employed Reynolds numbers were from [Formula: see text] to [Formula: see text]. The drag coefficients were independent of the Reynolds number Re and could be divided into two regions between [Formula: see text] and 1.68. The base pressure coefficient decreased monotonically from 1.0 to 1.68. The drag did not significantly change for [Formula: see text] and 1.2 with angles of attack from -2 to 2 deg. In contrast, it quadratically increased from [Formula: see text] and 2.0. The lift–curve slopes were negative from [Formula: see text] to 1.2 and positive from [Formula: see text] to 2.0, confirming the reversal. The moment–curve slopes were negative for all fineness ratios. Notably, these changed linearly from [Formula: see text] to 1.2 and nonlinearly from [Formula: see text] to 2.0. The visualization test using the surface-oil-flow method revealed that the square cylinders had a reattachment position near [Formula: see text] for [Formula: see text] and [Formula: see text] for [Formula: see text]. This suggests that the reversal of the lift–curve slope was caused by reattachment.

  10. High-efficiency sound source localization using data-driven sparse sampling with validation using monopole laser sound source International-journal Peer-reviewed

    Sayumi Kaneko, Yuta Ozawa, Kumi Nakai, Yuji Saito, Keisuke Asai, Taku Nonomura, Hiroki Ura

    AIP Advances　14　(6)　2024/06/01

    Publisher: AIP Publishing

    DOI： 10.1063/5.0205567 　

    eISSN： 2158-3226

    More details Close

    This study proposes a framework that reduces the calculation cost of sound source localization with the Amiet model, using a data-driven sparse sampling method. This method accelerates the calculation of the steering vector used in conventional beamforming. An aeroacoustic wind tunnel test was conducted in a 2 × 2 m2 low-speed wind tunnel, and the proposed method was verified. During the test, a monopole laser sound source, which does not interfere with the flow, was used, and its acoustic signals were measured using a microphone array. Next, steering vectors were reconstructed by discovering dominant modes and optimized sampling points from the training data based on the Amiet model and the modified data-driven sparse sampling method. Finally, the sound-source positions when the steering vector of the proposed model was used were compared with the positions observed when the steering vector of which all the grid points were calculated was used. The error was less than 2 mm when 16 modes were used, and the calculation time was reduced to ∼1/33 of that of the previous Amiet model.

  11. Sensor Selection by Greedy Method for Linear Dynamical Systems: Comparative Study on Fisher-Information-Matrix, Observability-Gramian and Kalman-Filter-Based Indices International-journal Peer-reviewed

    Shun Takahashi, Yasuo Sasaki, Takayuki Nagata, Keigo Yamada, Kumi Nakai, Yuji Saito, Taku Nonomura

    IEEE Access　11　67850-67864　2023/06/03

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/access.2023.3291415 　

    eISSN： 2169-3536

  12. Randomized Group-Greedy Method for Large-Scale Sensor Selection Problems International-journal Peer-reviewed

    Takayuki Nagata, Keigo Yamada, Kumi Nakai, Yuji Saito, Taku Nonomura

    IEEE Sensors Journal　23　(9)　9536-9548　2023/05/01

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/jsen.2023.3258223 　

    ISSN： 1530-437X

    eISSN： 1558-1748 2379-9153

  13. Observation site selection for physical model parameter estimation towards process-driven seismic wavefield reconstruction International-journal Peer-reviewed

    Kumi Nakai, Takayuki Nagata, Keigo Yamada, Yuji Saito, Taku Nonomura, Msayuki Kano, Shin-ichi Ito, Hiromichi Nagao

    Geophysical Journal International　234　(3)　1786-1805　2023/04/18

    Publisher: Oxford University Press (OUP)

    DOI： 10.1093/gji/ggad165 　

    ISSN： 0956-540X

    eISSN： 1365-246X

    More details Close

    SUMMARY The ‘big’ seismic data not only acquired by seismometers but also acquired by vibrometers installed in buildings and infrastructure and accelerometers installed in smartphones will be certainly utilized for seismic research in the near future. Since it is impractical to utilize all the seismic big data in terms of the computational cost, methods which can select observation sites depending on the purpose are indispensable. We propose an observation site selection method for the accurate reconstruction of the seismic wavefield by process-driven approaches. The proposed method selects observation sites suitable for accurately estimating physical model parameters such as subsurface structures and source information to be input into a numerical simulation of the seismic wavefield. The seismic wavefield is reconstructed by the numerical simulation using the parameters estimated based on the observed signals at only observation sites selected by the proposed method. The observation site selection in the proposed method is based on the sensitivity of each observation site candidate to the physical model parameters; the matrix corresponding to the sensitivity is constructed by approximately calculating the derivatives based on the simulations, and then, observation sites are selected by evaluating the quantity of the sensitivity matrix based on the D-optimality criterion proposed in the optimal design of experiments. In this study, physical knowledge on the sensitivity to the parameters such as seismic velocity, layer thickness, and hypocentre location was obtained by investigating the characteristics of the sensitivity matrix. Furthermore, the effectiveness of the proposed method was shown by verifying the accuracy of seismic wavefield reconstruction using the observation sites selected by the proposed method.

  14. Seismic wavefield reconstruction based on compressed sensing using data-driven reduced-order model International-journal Peer-reviewed

    Takayuki Nagata, Kumi Nakai, Keigo Yamada, Yuji Saito, Taku Nonomura, Masayuki Kano, Shin-ichi Ito, Hiromichi Nagao

    Geophysical Journal International　233　(1)　33-50　2023/04

    Publisher: Oxford University Press (OUP)

    DOI： 10.1093/gji/ggac443 　

    ISSN： 0956-540X

    eISSN： 1365-246X

    More details Close

    SUMMARY Reconstruction of the distribution of ground motion due to an earthquake is one of the key technologies for the prediction of seismic damage to infrastructure. Particularly, the immediate reconstruction of the spatially continuous wavefield is valuable for decision-making of disaster response decisions in the initial phase. For a fast and accurate reconstruction, utilization of prior information is essential. In fluid mechanics, full-state recovery, which recovers the full state from sparse observation using a data-driven model reduced-order model, is actively used. In this study, the framework developed in the field of fluid mechanics is applied to seismic wavefield reconstruction. A seismic wavefield reconstruction framework based on compressed sensing using the data-driven reduced-order model (ROM) is proposed and its characteristics are investigated through numerical experiments. The data-driven ROM is generated from the data set of the wavefield using the singular value decomposition. The spatially continuous seismic wavefield is reconstructed from the sparse and discrete observation and the data-driven ROM. The observation sites used for reconstruction are effectively selected by the sensor optimization method for linear inverse problems based on a greedy algorithm. The proposed framework was applied to simulation data of theoretical waveform with the subsurface structure of the horizontally stratified three layers. The validity of the proposed method was confirmed by the reconstruction based on the noise-free observation. Since the ROM of the wavefield is used as prior information, the reconstruction error is reduced to an approximately lower error bound of the present framework, even though the number of sensors used for reconstruction is limited and randomly selected. In addition, the reconstruction error obtained by the proposed framework is much smaller than that obtained by the Gaussian process regression. For the numerical experiment with noise-contaminated observation, the reconstructed wavefield is degraded due to the observation noise, but the reconstruction error obtained by the present framework with all available observation sites is close to a lower error bound, even though the reconstructed wavefield using the Gaussian process regression is fully collapsed. Although the reconstruction error is larger than that obtained using all observation sites, the number of observation sites used for reconstruction can be reduced while minimizing the deterioration and scatter of the reconstructed data by combining it with the sensor optimization method. Hence, a better and more stable reconstruction of the wavefield than randomly selected observation sites can be realized, even if the reconstruction is carried out with a smaller number of observations with observation noise, by combining it with the sensor optimization method.

  15. Nondominated-Solution-Based Multi-Objective Greedy Sensor Selection for Optimal Design of Experiments International-journal Peer-reviewed

    Kumi Nakai, Yasuo Sasaki, Takayuki Nagata, Keigo Yamada, Yuji Saito, Taku Nonomura

    IEEE Transactions on Signal Processing　70　5694-5707　2022/12

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/tsp.2022.3224643 　

    ISSN： 1053-587X

    eISSN： 1941-0476

  16. Simultaneous measurement of pressure and temperature on the same surface by sensitive paints using the sensor selection method International-journal International-coauthorship Peer-reviewed

    Neetu Tiwari, Kazuki Uchida, Ryoma Inoba, Yuji Saito, Keisuke Asai, Taku Nonomura

    Experiments in Fluids　63　(11)　2022/11

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s00348-022-03501-x 　

    ISSN： 0723-4864

    eISSN： 1432-1114

  17. Data-Driven Sensor Selection Method Based on Proximal Optimization for High-Dimensional Data With Correlated Measurement Noise International-journal Peer-reviewed

    Takayuki Nagata, Keigo Yamada, Taku Nonomura, Kumi Nakai, Yuji Saito, Shunsuke Ono

    IEEE Transactions on Signal Processing　70　1-13　2022/10

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/tsp.2022.3212150 　

    ISSN： 1053-587X

    eISSN： 1941-0476

  18. Proof-of-concept study of sparse processing particle image velocimetry for real time flow observation International-journal Peer-reviewed

    Naoki Kanda, Chihaya Abe, Shintaro Goto, Keigo Yamada, Kumi Nakai, Yuji Saito, Keisuke Asai, Taku Nonomura

    Experiments in Fluids　63　(9)　2022/09

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s00348-022-03471-0 　

    ISSN： 0723-4864

    eISSN： 1432-1114

  19. Feasibility Study of Controlling Supersonic Boundary-layer Flows Using Jets Flapping at Several Tens of Kilohertz Peer-reviewed

    Rui Aoki, Ikuhiro Fujimura, Taro Handa, Chungil Lee, Yuta Ozawa, Yuji Saito, Taku Nonomura, Keisuke Asai

    Transactions of the Japan Society for Aeronautical and Space Sciences　65　(5)　221-229　2022/09

    Publisher: Japan Society for Aeronautical and Space Sciences

    DOI： 10.2322/tjsass.65.221 　

    ISSN： 0549-3811

    eISSN： 2189-4205

  20. Optimal gate selection method for simultaneous lifetime-based measurement of PSP and TSP International-journal Peer-reviewed

    Miku Kasai, Takayuki Nagata, Taku Nonomura, Yuji Saito, Keisuke Asai

    Measurement Science and Technology　33　(9)　095203-095203　2022/09/01

    Publisher: IOP Publishing

    DOI： 10.1088/1361-6501/ac769b 　

    ISSN： 0957-0233

    eISSN： 1361-6501

  21. Optimization of sparse sensor placement for estimation of wind direction and surface pressure distribution using time-averaged pressure-sensitive paint data on automobile model Peer-reviewed

    Ryoma Inoba, Kazuki Uchida, Yuto Iwasaki, Takayuki Nagata, Yuta Ozawa, Yuji Saito, Taku Nonomura, Keisuke Asai

    Journal of Wind Engineering and Industrial Aerodynamics　227　105043-105043　2022/08

    Publisher: Elsevier BV

    DOI： 10.1016/j.jweia.2022.105043 　

    ISSN： 0167-6105

  22. Evaluation of Optimization Algorithms and Noise Robustness of Sparsity-Promoting Dynamic Mode Decomposition International-journal Peer-reviewed

    Yuto Iwasaki, Taku Nonomura, Kumi Nakai, Takayuki Nagata, Yuji Saito, Keisuke Asai

    IEEE Access　10　80748-80763　2022/07

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/access.2022.3193157 　

    eISSN： 2169-3536

  23. Greedy Sensor Selection for Weighted Linear Least Squares Estimation Under Correlated Noise International-journal Peer-reviewed

    Keigo Yamada, Yuji Saito, Taku Nonomura, Keisuke Asai

    IEEE Access　10　79356-79364　2022/07

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/access.2022.3194250 　

    eISSN： 2169-3536

  24. Time-resolved particle image velocimetry and pressure sensitive paint measurements of afterbody flow dynamics International-coauthorship Peer-reviewed

    Fernando Zigunov, Prabu Sellappan, Farrukh Alvi, Yuta Ozawa, Yuji Saito, Taku Nonomura, Keisuke Asai

    Physical Review Fluids　7　(2)　2022/02/01

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevfluids.7.024701 　

    eISSN： 2469-990X

  25. Single-pixel correlation applied to background-oriented schlieren measurement International-journal Peer-reviewed

    Hikaru Sugisaki, Chungil Lee, Yuta Ozawa, Kumi Nakai, Yuji Saito, Taku Nonomura, Keisuke Asai, Yu Matsuda

    Experiments in Fluids　63　(1)　2022/01

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s00348-021-03373-7 　

    ISSN： 0723-4864

    eISSN： 1432-1114

  26. Aeroacoustic Fields of Supersonic Twin Jets at the Ideally Expanded Condition Peer-reviewed

    Yuta Ozawa, Taku Nonomura, Yuji Saito, Keisuke Asai

    Transactions of the Japan Society for Aeronautical and Space Sciences　64　(6)　312-324　2021/11/04

    Publisher: Japan Society for Aeronautical and Space Sciences

    DOI： 10.2322/tjsass.64.312 　

    ISSN： 0549-3811

    eISSN： 2189-4205

  27. Proposal and verification of optical flow reformulation based on variational method for skin-friction-stress field estimation from unsteady oil film distribution Peer-reviewed

    Kanta Endo, Takumi Ambo, Yuji Saito, Taku Nonomura, Lin Chen, Keisuke Asai

    Journal of Visualization　25　(2)　263-280　2021/09/28

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s12650-021-00794-8 　

    ISSN： 1343-8875

    eISSN： 1875-8975

  28. Fast greedy optimization of sensor selection in measurement with correlated noise Peer-reviewed

    Keigo Yamada, Yuji Saito, Koki Nankai, Taku Nonomura, Keisuke Asai, Daisuke Tsubakino

    Mechanical Systems and Signal Processing　158　107619-107619　2021/09

    Publisher: Elsevier BV

    DOI： 10.1016/j.ymssp.2021.107619 　

    ISSN： 0888-3270

    eISSN： 1096-1216

  29. Data-Driven Determinant-Based Greedy Under/Oversampling Vector Sensor Placement International-journal Peer-reviewed

    Yuji Saito, Keigo Yamada, Naoki Kanda, Kumi Nakai, Takayuki Nagata, Taku Nonomura, Keisuke Asai

    Computer Modeling in Engineering & Sciences　129　(1)　1-30　2021/08

    Publisher: Computers, Materials and Continua (Tech Science Press)

    DOI： 10.32604/cmes.2021.016603 　

    ISSN： 1526-1506

    eISSN： 1526-1506

  30. Feasibility Study on Real-time Observation of Flow Velocity Field using Sparse Processing Particle Image Velocimetry International-journal Peer-reviewed

    Naoki Kanda, Kumi Nakai, Yuji Saito, Taku Nonomura, Keisuke Asai

    Transactions of the Japan Society for Aeronautical and Space Sciences　64　(4)　242-245　2021/07/04

    Publisher: Japan Society for Aeronautical and Space Sciences

    DOI： 10.2322/tjsass.64.242 　

    ISSN： 0549-3811

    eISSN： 2189-4205

  31. Data-Driven Sparse Sensor Selection Based on A-Optimal Design of Experiment With ADMM Peer-reviewed

    Takayuki Nagata, Taku Nonomura, Kumi Nakai, Keigo Yamada, Yuji Saito, Shunsuke Ono

    IEEE Sensors Journal　21　(13)　15248-15257　2021/07/01

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/jsen.2021.3073978 　

    ISSN： 1530-437X

    eISSN： 2379-9153

  32. Analysis of transonic buffet on ONERA-M4 model with unsteady pressure-sensitive paint Peer-reviewed

    Kazuki Uchida, Yosuke Sugioka, Miku Kasai, Yuji Saito, Taku Nonomura, Keisuke Asai, Kazuyuki Nakakita, Yusuke Nishizaki, Yoshiyuki Shibata, Seiichi Sonoda

    Experiments in Fluids　62　(6)　2021/06

    DOI： 10.1007/s00348-021-03228-1 　

    ISSN： 0723-4864

    eISSN： 1432-1114

  33. Data-Driven Sparse Sampling for Reconstruction of Acoustic-Wave Characteristics Used in Aeroacoustic Beamforming Peer-reviewed

    Sayumi Kaneko, Yuta Ozawa, Kumi Nakai, Yuji Saito, Taku Nonomura, Keisuke Asai, Hiroki Ura

    Applied Sciences　11　(9)　4216-4216　2021/05/06

    Publisher: MDPI AG

    DOI： 10.3390/app11094216 　

    eISSN： 2076-3417

  34. Determinant-Based Fast Greedy Sensor Selection Algorithm Peer-reviewed

    Yuji Saito, Taku Nonomura, Keigo Yamada, Kumi Nakai, Takayuki Nagata, Keisuke Asai, Yasuo Sasaki, Daisuke Tsubakino

    IEEE Access　9　68535-68551　2021/04

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/access.2021.3076186 　

    eISSN： 2169-3536

  35. Effect of Objective Function on Data-Driven Greedy Sparse Sensor Optimization Peer-reviewed

    Kumi Nakai, Keigo Yamada, Takayuki Nagata, Yuji Saito, Taku Nonomura

    IEEE Access　9　46731-46743　2021/03

    DOI： 10.1109/access.2021.3067712 　

    ISSN： 2169-3536

    eISSN： 2169-3536

  36. Effect of Oxygen Mole Fraction on Static Properties of Pressure-Sensitive Paint Peer-reviewed

    Tomohiro Okudera, Takayuki Nagata, Miku Kasai, Yuji Saito, Taku Nonomura, Keisuke Asai

    Sensors　21　(4)　1062-1062　2021/02/04

    DOI： 10.3390/s21041062 　

    eISSN： 1424-8220

  37. Randomized Subspace Newton Convex Method Applied to Data-Driven Sensor Selection Problem Peer-reviewed

    Taku Nonomura, Shunsuke Ono, Kumi Nakai, Yuji Saito

    IEEE Signal Processing Letters　28　284-288　2021/01

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/lsp.2021.3050708 　

    ISSN： 1070-9908

    eISSN： 1558-2361

  38. Stabilized combustion of circular fuel duct with liquid oxygen Peer-reviewed

    Ayumu Tsuji, Yuji Saito, Landon Kamps, Masashi Wakita, Harunori Nagata

    Proceedings of the Combustion Institute　38　(3)　4845-4855　2020/07

    Publisher: Elsevier BV

    DOI： 10.1016/j.proci.2020.07.001 　

    ISSN： 1540-7489

  39. Data-Driven Vector-Measurement-Sensor Selection Based on Greedy Algorithm Peer-reviewed

    Yuji Saito, Taku Nonomura, Koki Nankai, Keigo Yamada, Keisuke Asai, Yasuo Sasaki, Daisuke Tsubakino

    IEEE Sensors Letters　4　(7)　1-4　2020/07

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/lsens.2020.2999186 　

    eISSN： 2475-1472

  40. Investigation of Graphite Nozzle Erosion in Hybrid Rockets Using Oxygen/High-Density Polyethylene

    Landon Kamps, Shota Hirai, Kazuhito Sakurai, Tor Viscor, Yuji Saito, Raymond Guan, Hikaru Isochi, Naoto Adachi, Mitsunori Itoh, Harunori Nagata

    Journal of Propulsion and Power　36　(3)　423-434　2020/05

    Publisher: American Institute of Aeronautics and Astronautics (AIAA)

    DOI： 10.2514/1.b37568 　

    eISSN： 1533-3876

  41. Mission to Earth–Moon Lagrange Point by a 6U CubeSat: EQUULEUS Peer-reviewed

    Ryu Funase, Satoshi Ikari, Kota Miyoshi, Yosuke Kawabata, Shintaro Nakajima, Shunichiro Nomura, Nobuhiro Funabiki, Akihiro Ishikawa, Kota Kakihara, Shuhei Matsushita, Ryohei Takahashi, Kanta Yanagida, Daiko Mori, Yusuke Murata, Toshihiro Shibukawa, Ryo Suzumoto, Masahiro Fujiwara, Kento Tomita, Hiroki Aohama, Keidai Iiyama, Sho Ishiwata, Hirotaka Kondo, Wataru Mikuriya, Hiroto Seki, Hiroyuki Koizumi, Jun Asakawa, Keita Nishii, Akihiro Hattori, Yuji Saito, Kosei Kikuchi, Yuta Kobayashi, Atsushi Tomiki, Wataru Torii, Taichi Ito, Stefano Campagnola, Naoya Ozaki, Nicola Baresi, Ichiro Yoshikawa, Kazuo Yoshioka, Masaki Kuwabara, Reina Hikida, Shogo Arao, Shinsuke Abe, Masahisa Yanagisawa, Ryota Fuse, Yosuke Masuda, Hajime Yano, Takayuki Hirai, Kazuyoshi Arai, Ritsuko Jitsukawa, Eigo Ishioka, Haruki Nakano, Toshinori Ikenaga, Tatsuaki Hashimoto

    IEEE Aerospace and Electronic Systems Magazine　35　(3)　30-44　2020/03/01

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/maes.2019.2955577 　

    ISSN： 0885-8985

    eISSN： 1557-959X

  42. Experimental Investigation of the Continuous Transition of Flame-Spreading near the Blow-Off Limit Peer-reviewed

    K. Komizu, Y. Saito, A. Tsuji, H. Nagata

    Journal of Combustion　2020　2020/02

    DOI： 10.1155/2020/3187694 　

    ISSN： 2090-1968

    eISSN： 2090-1976

  43. Investigation of Graphite Nozzle Erosion in Hybrid Rockets Using O2/HDPE Peer-reviewed

    Landon Kamps, Shota Hirai, Kazuhito Sakurai, Tor Viscor, Yuji Saito, Raymond Guan, Hikaru Isochi, Mitsunori Itoh, Harunori Nagata

    AIAA Propulsion and Energy Forum and Exposition, 2019　2020

    DOI： 10.2514/6.2019-4264 　

  44. Data-driven Vector-measurement-sensor Selection based on Greedy Algorithm for Particle-image-velocimetry Measurement

    Yuji Saito, Taku Nonomura, Koki Nankai, Keisuke Asai, Yasuo Sasaki, Daisuke Tsubakino

    arXiv　2019/05

    More details Close

    A reduced-order modelling for fluid analysis and flow control gathers a lot of attentions. With regard to reduced order modelling, proper orthogonal decomposition (POD) is one of the effective methods to decompose the high-dimension fluid data into several significant mode of flow fields. Previous studies show that the limited sensor placed at appropriate positions gives us the approximated full state information. In this study, the extension of the vector-measurement sensor selection of the greedy algorithm was conducted in addition to that of convex approximation. This applied to test and PIV data to reconstruct the full state based on the information given by the sparse vector-measurement sensors.

  45. Comprehensive Data Reduction for N2O/HDPE Hybrid Rocket Motor Performance Evaluation Peer-reviewed

    Landon Kamps, Kazuhito Sakurai, Yuji Saito, Harunori Nagata

    AEROSPACE　6　(4)　2019/04

    DOI： 10.3390/aerospace6040045 　

    ISSN： 2226-4310

    eISSN： 2226-4310

  46. Study on Hysteresis Characteristics of Axial-injection End-burning Hybrid Rockets under Throttling Operation Peer-reviewed

    Kimino Masaya, Saito Yuji, Okutani Yushi, Tsuji Ayumu, Soeda Kentaro, Nagata Harunori

    JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES　67　(4)　119-125　2019

    Publisher: THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES

    DOI： 10.2322/jjsass.67.119 　

    ISSN： 1344-6460

    More details Close

    <p>In this study, the authors conduced ten firings to investigate a hysteresis characteristics in Axial-Injection End-Burning hybrid rockets under throttling operation. Oxidizer mass flow rate and chamber pressure were throttled by two methods, actuating valves in a fluid circuit consisting of two oxidizer supply lines and a motor controlling. Chamber pressure and oxidizer mass flow rate were measured during each firing. The results show that two types of hysteresis characteristics were observed when throttling operation is repeated. One is a hysteresis with respect to increase and decrease of the oxidizer mass flow rate. Another is a hysteresis for the cycle. It is considered that the former hysteresis has the influence of a chamber pressure response time. In addition, the latter hysteresis is not necessarily observed even in the same chamber pressure region. </p>

  47. Combustion Mechanisms of Axial-Injection End-Burning Hybrid Rockets

    SAITO YUJI

    Hokkaido University　2018/03

    DOI： 10.14943/doctoral.k13203 　

  48. Investigation of Throttling Response Characteristics of Axial-Injection End-Burning Hybrid Rockets Peer-reviewed

    Yuji SAITO, Masaya KIMINO, Ayumu TSUJI, Kazunobu OMURA, Hiroyuki YASUKOCHI, Kentaro SOEDA, Tsuyoshi TOTANI, Masashi WAKITA, Harunori NAGATA

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN　16　(1)　9-18　2018

    DOI： 10.2322/tastj.16.9 　

  49. Method for Determining Nozzle-Throat-Erosion History in Hybrid Rockets Peer-reviewed

    Landon Kamps, Yuji Saito, Ryosuke Kawabata, Masashi Wakita, Tsuyoshi Totani, Yusuke Takahashi, Harunori Nagata

    JOURNAL OF PROPULSION AND POWER　33　(6)　1369-1377　2017/11

    DOI： 10.2514/1.B36390 　

    ISSN： 0748-4658

    eISSN： 1533-3876

  50. Verification Firings of End-Burning Type Hybrid Rockets Peer-reviewed

    Harunori Nagata, Hayato Teraki, Yuji Saito, Ryuichiro Kanai, Hiroyuki Yasukochi, Masashi Wakita, Tsuyoshi Totani

    JOURNAL OF PROPULSION AND POWER　33　(6)　1473-1477　2017/11

    DOI： 10.2514/1.B36359 　

    ISSN： 0748-4658

    eISSN： 1533-3876

  51. Investigation of axial-injection end-burning hybrid rocket motor regression Peer-reviewed

    Yuji Saito, Toshiki Yokoi, Lukas Neumann, Hiroyuki Yasukochi, Kentaro Soeda, Tsuyoshi Totani, Masashi Wakita, Harunori Nagata

    ADVANCES IN AIRCRAFT AND SPACECRAFT SCIENCE　4　(3)　281-296　2017/05

    DOI： 10.12989/aas.2017.4.3.281 　

    ISSN： 2287-528X

    eISSN： 2287-5271

  52. Investigation of the Throttling Characteristics of Axial-injection End-burning Hybrid Rockets Peer-reviewed

    SAITO Yuji, YOKOI Toshiki, TSUJI Ayumu, OMURA Kazunobu, YASUKOCHI Hiroyuki, SOEDA Kentaro, TOTANI Tsuyoshi, WAKITA Masashi, NAGATA Harunori

    JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES　65　(4)　157-167　2017

    Publisher: THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES

    DOI： 10.2322/jjsass.65.157 　

    ISSN： 1344-6460

    More details Close

    In this study, the authors conducted twice experiments to verify the throttling characteristics of axial-injection end-burning hybrid rockets. Oxidizer mass flow rate and chamber pressure were throttled by actuating valves in a fluid circuit consisting of two oxidizer supply lines. Chamber pressure and oxidizer mass flow rate were measured during each firing. The results show that oxidizer to fuel ratio remains constant for similar values of oxidizer mass flow rate. However, two weak points were identified in these throttling firing tests. First, a pressure transient was observed when oxidizer mass flow rate was increased (turn-up operation). The pressure transient consisted of two distinguishable first order lags, a fast lag followed by a slow lag, which are treated by separate curve fitting functions. The fast response is explained by a thermal lag in the solid fuel, whereas the slow response requires further inquiry. Second, the chamber pressure history exhibited hysteresis characteristics of oxidizer mass flow rate due to the increasing fuel regression rate. Therefore, in the throttling tests where oxidizer flow rate was turned-up and returned to the initial condition twice back-to-back, the chamber pressure history was higher in the second iteration than in the first.

  53. Estimation of Hybrid Rocket Nozzle Throat Erosion History Peer-reviewed

    Yuji SAITO, Tsutomu UEMATSU, Hikaru ISOCHI, Masashi WAKITA, Tsuyoshi TOTANI, Harunori NAGATA

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN　14　(ists30)　Pa_145-Pa_151　2016

    DOI： 10.2322/tastj.14.Pa_145 　

Show all ︎Show first 5

Misc. 11

  1. 端面燃焼式ハイブリッドロケットの実用化に向けて Invited

    齋藤勇士

    ISASニュース　(6)　1-3　2024/06

    Publisher: 国立研究開発法人 宇宙航空研究開発機構 宇宙科学研究所

  2. Data-Driven Sparse Sensing for Aerospace Development Invited

    Yuji Saito

    Journal of the Robotics Society of Japan　41　(8)　665-668　2023/10/25

    DOI： 10.7210/jrsj.41.665 　

  3. Data-Driven Sparse Sensor Selection

    Yuji SAITO, Taku NONOMURA, Keisuke ASAI

    Journal of The Society of Instrument and Control Engineers　59　(8)　559-564　2020/08

    DOI： 10.11499/sicejl.59.559 　

  4. Searching for an Ignition System for a Lab-Scale Axial-Injection End-Burning Hybrid Rocket

    SAITO YUJI

    2020 年 68 巻 2 号 p. 31　68　(2)　31-31　2020/02/05

    DOI： 10.14822/kjsass.68.2_31 　

  5. Application of Axial-injection End-burning Hybrid Rockets to Small Spacecraft Propulsion

    SAITO Yuji, KIMINO Masaya, SOEDA Kentaro, TOTANI Tsuyoshi, NAGATA Harunori

    Aeronautical and Space Sciences Japan　66　(10)　291-295　2018

    Publisher: THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES

    DOI： 10.14822/kjsass.66.10_291 　

    ISSN： 0021-4663

  6. Development of Hybrid Thruster Ignition System with Low-Toxicity Fuel and Catalytic Reaction International-journal

    Yuji Saito, Alejandro Taiki Padilla Torres, Ikeda Hirohide, Taiichi Nagata, Yoshiki Matsuura, Shinji Igarashi, Hironori Chiba, Kosuke Kida, Toshinori Kuwahara

    Proceedings of the 74th International Astronautical Congress　IAC-23,C4,4,11,x79623　2023/10

  7. Investigation of graphite nozzle erosion in hybrid rockets using o2/c2h4

    Landon Kamps, Shota Hirai, Kazuhito Sakurai, Tor Viscor, Yuji Saito, Raymond Guan, Hikaru Isochi, Naoto Adachi, Mitsunori Itoh, Harunori Nagata

    2018 Joint Propulsion Conference　2018/01/01

    DOI： 10.2514/6.2018-4531 　

  8. The accuracy of reconstruction techniques for determining hybrid rocket fuel regression rate

    Yuji Saito, Landon Kamps, Kodai Komizu, Kentaro Soeda, Daniele Bianchi, Francesco Nasuti, Harunori Nagata

    2018 Joint Propulsion Conference　2018/01/01

    DOI： 10.2514/6.2018-4923 　

  9. Investigation of regression characteristics under relatively high-pressure in Axial-injection End-Burning Hybrid Rockets

    Yuji Saito, Masaya Kimino, Tsuji Ayumu, Yushi Okutani, Kazunobu Omura, Hiroyuki Yasukochi, Kentaro Soeda, Tsuyoshi Totani, Masashi Wakita, Harunori Nagata

    53rd AIAA/SAE/ASEE Joint Propulsion Conference, 2017　2017/01/01

  10. Experimental and analytical investigation of effect of pressure on regression rate of axial-injection end-burning hybrid rockets

    Yuji Saito, Toshiki Yokoi, Harunori Nagata, Hiroyuki Yasukochi, Kentaro Soeda, Tsuyoshi Totani, Masashi Wakita

    52nd AIAA/SAE/ASEE Joint Propulsion Conference, 2016　47　9p　2016/01/01

    Publisher: 日本航空宇宙学会

  11. Verification of the throttling characteristics of axial-injection end-burning type hybrid rockets

    Yuji Saito, Toshiki Yokoi, Hiroyuki Yasukochi, Kentaro Soeda, Tsuyoshi Totani, Masashi Wakita, Harunori Nagata

    Proceedings of the International Astronautical Congress, IAC　2016　S1920202　2016/01/01

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jsmemecj.2016.s1920202 　

    ISSN： 0074-1795

    eISSN： 2424-2667

Show all ︎Show first 5

Presentations 65

  1. Research and Development of Chemical Hybrid Propulsion System Invited

    Yuji Saito

    2025/03/04

  2. Experimental Study on Internal Ballistics for ELS-R100 Hybrid Thruster International-presentation

    Yuji Saito, Shota Kameyama, Kosuke Kida, Hinata Kariya, Toshinori Kuwahara, Kazuhisa Fujita, Ryohei Kobayashi, Hirohide Ikeda, Taiichi Nagata

    21st International Conference on Flow Dynamics (ICFD2024)　2024/11/19

  3. Research and Development of Hybrid Thruster for ELS-R100: Mission Concept & Firing Test Results International-presentation International-coauthorship

    Yuji Saito, Shota Kameyama, Kosuke Kida, Toshinori Kuwahara, Kazuhisa Fujita, Ryohei Kobayashi, Ikeda Hirohide, Taiichi Nagata

    75th International Astronautical Congress　2024/10/15

  4. Solver development for spreading diffusion flame over regressive solid fuel in opposed flow

    Yuji Saito, Youhi Morii

    The 61st Symposium (Japanese) on Combustion　2023/11/17

  5. Development of Hybrid Thruster Ignition System with Low-Toxicity Fuel and Catalytic Reaction International-presentation

    Yuji Saito, Alejandro Taiki, Padilla Torres, Ikeda Hirohide, Taiichi Nagata, Yoshiki Matsuura, Shinji Igarashi, Hironori Chiba, Kosuke Kida, Toshinori Kuwahara

    74th International Astronautical Congress　2023/10/04

  6. Reconstruction techniques for determining O/F in hybrid rockets

    Yuji Saito, Landon T. Kamps, Ayumu Tsuji, Harunori Nagata

    AIAA Propulsion and Energy 2021 Forum　2021/08/09

  7. Initial Firing Tests of Aluminum Rod/Water Hybrid Rockets

    Yuji Saito, Landon T. Kamps, Ayumu Tsuji, Masashi Wakita, Koizumi Hiroyuki, Keisuke Asai, Harunori Nagata

    AIAA Propulsion and Energy 2020 Forum　2020/08/24

  8. Residual thrust problems and actual measurements for HILS construction of hybrid thrusters

    2025/04/03

  9. ハイブリッドスラスタの残推⼒問題と実計測に向けたシステム設計

    仮屋 陽太, 古田 雄大, 齋藤 勇士, 桒原 聡文

    ⽇本航空宇宙学会北部⽀部２０２５年講演会ならびに第６回再使⽤型宇宙輸送系シンポジウム　2025/03/11

  10. ハイブリッドスラスタの残推力問題と熱輻射の影響に関する研究

    仮屋陽太, 齋藤勇士, 桒原聡文

    第7回ハイブリッドロケットシンポジウム　2025/03/04

  11. ハイブリッドロケット燃料の時空間解像計測の提案

    水川雄介, 佐貫眞人, 川合慧実, 齋藤勇士

    第7回ハイブリッドロケットシンポジウム　2025/03/04

  12. 簡易再現法とその推進剤定数

    川合慧実, 水川雄介, 佐貫眞人, 齋藤勇士

    第7回ハイブリッドロケットシンポジウム　2025/03/04

  13. スティングを含むベース流れのスペクトル固有直交分解解析

    李 忠日, 小澤雄太, 山田圭吾, 齋藤勇士, 野々村拓, 大山 聖

    令和6年度宇宙航行の力学シンポジウムプログラム　2024/12/16

  14. ハイブリッドスラスタの詳細燃料後退形状を考慮した残推力推定

    仮屋 陽太, 齋藤 勇士, 桒原 聡文

    第68回宇宙科学技術連合講演会　2024/11/07

  15. 高頻度低軌道実験・回収システム実証機 ELS-R100 の開発進捗

    藤田 和央, 杉村 伸雄, 山田 建一郎, 苅宿 充博, 佐々木 司, 小林 稜平, 桒原 聡文, 齋藤 勇士

    第68回宇宙科学技術連合講演会　2024/11/05

  16. Reconstruction Technique for Hybrid Rocket Fuel Regression towards Overcoming Multiple Solutions International-presentation

    Alejandro Taiki, Padilla Torres, Yuji Saito, Toshinori Kuwahara

    Twentieth International Conference on Flow Dynamic　2023/11/07

  17. Lunar Orbit Mission using Spatial-resolved Fuel Regression Rate of Hybrid Thrusters International-presentation

    Alejandro Taiki Padilla, Torres, Tomoya Takuma, Yuji Saito, Toshinori Kuwahara

    34th International Symposium on Space Technology and Science　2023/06/08

  18. Simulation Evaluation of Re-entry Control Technique for Small Satellite ELS-R100

    Takumi Saito, Toshinori Kuwahara, Mitsuki Takaoka, Yo Kawamata, Shinya Fujita, Yuji Saito, Nobuo Sugimura, Yuji Sato, Ryotaro Murakami

    34th International Symposium on Space Technology and Science　2023/06/07

  19. Analysis of Transonic Base-Flow based on Double-Pulse Schlieren Measurement

    2022/11/04

  20. Development of Optimal Design Method for Axial-Injection End-Burning Hybrid Rockets and Performance Comparison with Variable Strength Oxidizer Flow Swirl-Type Hybrid Rockets

    2022/11/04

  21. Design Analysis of Re-entry Trajectory of Small Recovery Capsule Technology Demonstration Satellite ELS-R100

    2022/11/03

  22. Applying single-pixel ensemble correlation to process of calculating displacements in background oriented schlieren International-presentation

    Hikaru Sugisaki, Chungil Lee, Yuta Ozawa, Kumi Nakai, Yuji Saito, Taku Nonomura, Keisuke Asai, Yu Matsuda

    AIAA AVIATION 2022 Forum　2022/06/27

  23. Optimizing Sparse Sensor Placement for Flow Field Estimation Using Time-Averaged Pressure-Sensitive Paint Data: Application to Ground Vehicle International-presentation

    Ryoma Inoba, Kazuki Uchida, Yuto Iwasaki, Takayuki Nagata, Yuta Ozawa, Yuji Saito, Taku Nonomura, Keisuke Asai

    AIAA AVIATION 2022 Forum　2022/06/27

  24. 「塊状アルミニウム-水」ハイブリッド燃焼を用いた推進系の開発

    齋藤勇士, 小泉宏之, 浅川純

    JAXA 宇宙探査オープンイノベーションフォーラム　2022/01/21

  25. Innovative Space Propulsion System Invited

    Yuji Saito

    The 8th Young researchers ensemble workshop　2021/11/17

  26. 観測ノイズを考慮したスパースセンサ位置最適化 Invited

    齋藤勇士

    第1回設計と運用に活かすデータ同化研究会　2021/02/19

  27. A new position and attitude measurement method for complex shape models with non-circular cross section in Magnetic Suspension and Balance System

    Masatoshi Horiguchi, Yuji Saito, Taku Nonomura, Keisuke Asai, Hideo Sawada, Yasfumi Konishi, Hiroyuki Okuizumi, Shigeru Obayashi

    AIAA Scitech 2021 Forum　2021/01/11

  28. Optimal Gate Selection Method for Pressure-Sensitive and Temperature-Sensitive Paint Measurement with Lifetime-based Method

    笠井美玖, 永田貴之, 野々村拓, 齋藤勇士, 浅井圭介

    可視化情報シンポジウム(CD-ROM)　2021

  29. Optimization of Sparse Sensor Placement for Prediction of Wind Direction Using Time-Averaged Pressure-Sensitive Paint Data on Automobile Model

    井野塲遼馬, 内田和樹, 小澤雄太, 永田貴之, 齋藤勇士, 野々村拓, 浅井圭介

    流体力学講演会/航空宇宙数値シミュレーション技術シンポジウム講演集(CD-ROM)　2021

  30. Data-Driven Sparse Sensor Selection

    Yuji SAITO, Taku NONOMURA, Keisuke ASAI

    Journal of The Society of Instrument and Control Engineers　2020/08

  31. Development of Reconstruction Techniques in Hybrid Rockets

    永田晴紀, KAMPS Landon, 齋藤勇士

    燃焼シンポジウム講演論文集(CD-ROM)　2020

  32. Evaluation of effects of oxygen concentration on the characteristics of pressure-sensitive paints

    奥寺智弘, 永田貴之, 笠井美玖, 齋藤勇士, 野々村拓, 浅井圭介

    可視化情報シンポジウム(CD-ROM)　2020

  33. Pressure and temperature sensitive paint measurement of rotor blade surface using lifetime-based method

    笠井美玖, 小澤雄太, 齋藤勇士, 野々村拓, 浅井圭介

    可視化情報シンポジウム(CD-ROM)　2020

  34. Feasibility Study on Sparse Processing Particle Image Velocimetry International-presentation

    Naoki Kanda, Koki Nankai, Yuji Saito, Taku Nonomura, Keisuke Asai

    72nd Annual Meeting of the APS Division of Fluid Dynamics　2019/11/26

  35. Determinant based Fast Greedy Optimization on Sparse Sensor Selection International-presentation

    Yuji Saito, Keigo Yamada, Taku Nonomura, Keisuke Asai, Daisuke Tsubakino, Yasuo Sasaki

    72nd Annual Meeting of the APS Division of Fluid Dynamics　2019/11/25

  36. Fast Greedy Optimization of Sensor Selection in Measurement with Correlated Noise International-presentation

    Keigo Yamada, Yuji Saito, Taku Nonomura, Keisuke Asai, Tomohiro Okudera

    72nd Annual Meeting of the APS Division of Fluid Dynamics　2019/11/25

  37. Response Mechanisms in Axial-Injection End-Burning Hybrid Rockets International-presentation

    Yuji Saito, Ayumu Tsuji, Ai Yamada, Harunori Nagata

    AIAA Propulsion and Energy 2019 Forum　2019/08

  38. System Integration of AQUARIUS, Propulsion System Installed on 6U CubeSat: EQUULEUS

    秋山茉莉子, 西井啓太, 菊池航世, 室原昌弥, WANG Qihang, 安宅泰穂, 齋藤勇士, 服部旭大, 浅川純, 小泉宏之, 柿原浩太, 柳田幹太, 鈴本遼, 飯山敬大, 船瀬龍, 小紫公也

    日本航空宇宙学会年会講演会講演集(CD-ROM)　2019

  39. Flight Model Development of the Water Resistojet Propulsion System for Deep Space Exploration by the CubeSat: EQUULEUS International-presentation

    Asakawa, J, Nishii, K, Hattori, A, Koizumi, H, Saito, Y, Kikuchi, K, Akiyama, M, Wang, Q, Ataka, Y, Komurasaki, K

    69th International Astronautical Congress　2018/09

  40. Investigation of Regression Rate under High-Pressure in Axial-Injection End-Burning Hybrid Rockets International-presentation

    Yushi Okutani, Yuji Saito, Masaya Kimino, Ayumu Tsuji, Kentaro Soeda, Harunori Nagata

    54th AIAA/SAE/ASEE Joint Propulsion Conference　2018/07

  41. Investigation of Graphite Nozzle Erosion in Hybrid Rockets Using O2/C2H4 International-presentation

    Landon Kamps, Shota Hirai, Kazuhito Sakurai, Tor Viscor, Yuji Saito, Raymond Guan, Hikaru Isochi, Naoto Adachi, Mitsunori Itoh, Harunori Nagata

    54th AIAA/SAE/ASEE Joint Propulsion Conference　2018/07

  42. The Accuracy of Reconstruction Techniques for Determining Hybrid Rocket Fuel Regression Rate International-presentation

    Yuji Saito, Landon Kamps, Kodai Komizu, Kentaro Soeda, Daniele Bianchi, Francesco Nasuti, Harunori Nagata

    54th AIAA/SAE/ASEE Joint Propulsion Conference　2018/07

  43. The Effect of Gravity on the Evaporation at the Gas-Liquid Separation System of Water Resistojet Thruster

    服部旭大, 西井啓太, 浅川純, 齋藤勇士, 菊池航世, 小泉宏之, 小紫公也

    宇宙科学技術連合講演会講演集(CD-ROM)　2018

  44. The accuracy of reconstruction techniques for determining hybrid rocket fuel regression rate

    Yuji Saito, Landon Kamps, Kodai Komizu, Kentaro Soeda, Daniele Bianchi, Francesco Nasuti, Harunori Nagata

    2018 Joint Propulsion Conference　2018/01/01

    More details Close

    © 2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. This study is an investigation of the accuracy of reconstruction techniques for determining instantaneous fuel regression rate. Results of reconstruction techniques are compared with results obtained through the measurement of the pressure drop across the fuel in an Axial-Injection End-Burning hybrid rocket (EBHR). The results of numerous firing tests show that this method allows for the evaluation of the accuracy of the instantaneous fuel regression rates obtained by reconstruction techniques. The error bias of O/F values calculated by the reconstruction techniques were around ±10%, and were mainly caused by uncertainties in the measured values of oxidizer mass flowrate and the definition of firing duration. The instantaneous length of an EBHR-type fuel can be calculated from the measurement of the pressure drop across the fuel. However, the calculated fuel length history obtained by the pressure drop in a port does not coincide with that obtained by the reconstruction technique because of an underestimation in pressure drop.

  45. Investigation of regression rate under high-pressure in axial-injection end-burning hybrid rockets

    Yushi Okutani, Yuji Saito, Masaya Kimino, Ayumu Tsuji, Kentaro Soeda, Harunori Nagata

    2018 Joint Propulsion Conference　2018/01/01

    More details Close

    © 2018 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. This study is an investigation of preeminent fuel regression rate in Axial-injection End-burning hybrid rockets under high pressure conditions. The authors overcame a back firing problem at high pressure conditions by redesigning and optimizing the fuel port diameter. The fuel grain outer diameter was 38 mm and the port diameter was 0.4 mm. Firing tests were conducted using gaseous oxygen as oxidizer at chamber pressures range from 0.98 MPa to 1.44 MPa. The results of four static firing tests show that fuel regression rate increases as the chamber pressure increases, which is consistent with previous research results. Fuel regression rate reached approximately 12.6 mm/s at 1.44 MPa. The authors reformulated the relationship between fuel regression rate and chamber pressure based on the results of high chamber pressure region, and showed that the pressure exponent increased from 1.09 to 1.20.

  46. Investigation of graphite nozzle erosion in hybrid rockets using o2/c2h4

    Landon Kamps, Shota Hirai, Kazuhito Sakurai, Tor Viscor, Yuji Saito, Raymond Guan, Hikaru Isochi, Naoto Adachi, Mitsunori Itoh, Harunori Nagata

    2018 Joint Propulsion Conference　2018/01/01

    More details Close

    © 2018 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. A recently developed reconstruction technique titled nozzle-throat reconstruction technique is used to investigate graphite nozzle-throat-erosion in two scales of hybrid rocket motors, 30N-thrust class and 2000N-thrust class, using oxygen as the oxidizer and high density polyethylene as the fuel. Thirty seven static firing tests were conducted under varying experimental conditions to confirm the validity of the reconstruction technique results, investigate the conditions at the onset of erosion and to formulate an empirical predictive model of nozzle erosion rate. Results show that nozzle erosion increases the convective heat transfer coefficient to upwards of 2-4 times the value predicted by Bartz correlation. Furthermore, an empirical model is introduced that treats the combustion gas as a single oxidizing agent with heterogeneous rate constants that are distributions of equivalence ratio of the bulk fluid flow. This empirical model predicts the nozzle throat erosion histories in multiple tests to within ± 5%.

  47. VERIFICATION OF THE THROTTLING CHARACTERISTICS OF AXIAL-INJECTION END-BURNING TYPE HYBRID ROCKETS International-presentation

    Y. Saito, T. Yokoi, H. Yasukochi, K. Soeda, T. Totani, M. Wakita, H. Nagata

    67th International Astronautical Congress　2017/10

  48. Investigation of Regression Characteristics under Relatively High-Pressure in Axial-Injection End-Burning Hybrid Rockets International-presentation

    Yuji Saito, Masaya Kimino, Ayumu Tstuji, Yushi Okutani, Hiroyuki Yashukochi, Kentaro Soeda, Harunori Nagata

    53rd AIAA/SAE/ASEE Joint Propulsion Conference　2017/07

  49. Investigation of Throttling Response Characteristics of Axial-Injection End-Burning Hybrid Rockets International-presentation

    Yuji SAITO, Masaya KIMINO, Ayumu TSUJI, Kazunobu OMURA, Hiroyuki YASUKOCHI, Kentaro SOEDA, Tsuyoshi TOTANI, Masashi WAKITA, Harunori NAGATA

    31st International Symposium on Space Technology and Science　2017/06

  50. Study on Response Time under Throttling Operation of End-Burning Hybrid Rockets

    齋藤 勇士, 君野 正弥, 津地 歩, 尾村 和信, 安河内 裕之, 添田 建太郎, 戸谷 剛, 脇田 督司, 永田 晴紀

    年会講演会講演集　2017/04/13

  51. Feasibility of End-Burning Hybrid Rockets with Liquid Oxygen

    津地歩, 齋藤勇士, 尾村和信, 君野正弥, 戸谷剛, 脇田督司, 永田晴紀

    宇宙科学技術連合講演会講演集(CD-ROM)　2017

  52. Study on Hysteresis Characteristics of Axial-Injection End-Burning Hybrid Rockets under Throttling Operation

    君野正弥, 齋藤勇士, 津地歩, 尾村和信, 安河内裕之, 添田建太郎, 戸谷剛, 脇田督司, 永田晴紀

    宇宙科学技術連合講演会講演集(CD-ROM)　2017

  53. Fuel Regression Characteristics of Axial-Injection End-Burning Hybrid Rockets Using N2O as an Oxidizer

    尾村和信, 津地歩, 齋藤勇士, 君野正弥, 奥谷勇士, 小水弘大, 戸谷剛, 脇田督司, 永田晴紀

    宇宙科学技術連合講演会講演集(CD-ROM)　2017

  54. 燃料微小管内を燃え拡がる火炎への雰囲気圧力の影響

    横井俊希, 齋藤勇士, 尾村和信, 津地歩, 安河内裕之, 添田建太郎, 脇田督司, 戸谷剛, 永田晴紀

    燃焼シンポジウム講演論文集　2016/11/26

  55. 端面燃焼式ハイブリッドロケットの燃料後退モデルに関する考察

    齋藤勇士, 横井俊希, 津地歩, 尾村和信, 安河内裕之, 添田建太郎, 戸谷剛, 脇田督司, 永田晴紀

    燃焼シンポジウム講演論文集　2016/11/26

  56. 液体酸素を用いた固体燃料管内燃え拡がりに関する研究

    津地歩, 齋藤勇士, 横井俊希, 尾村和信, 嶋田泰三, 戸谷剛, 脇田督司, 永田晴紀

    燃焼シンポジウム講演論文集　2016/11/26

  57. Accuracy and Applicability of a Reconstruction Technique for Determining Nozzle Throat Erosion History in Hybrid Rockets

    2016/09/06

  58. Method for Determining Nozzle Throat Erosion History in Hybrid Rockets International-presentation

    Landon T. Kamps, Yuji Saito, Ryosuke Kawabata, Yusuke Takahashi, Harunori Nagata

    52nd AIAA/SAE/ASEE Joint Propulsion Conference　2016/07

  59. Experimental and Analytical Investigation of Effect of Pressure on Regression Rate of Axial-Injection End-Burning Hybrid Rockets International-presentation

    Yuji Saito, Toshiki Yokoi, Harunori Nagata, Hiroyuki Yasukochi, Kentaro Soeda, Tsuyoshi Totani, Masashi Wakiata

    52nd AIAA/SAE/ASEE Joint Propulsion Conference　2016/07

  60. Experimental and Analytical Investigation of Effect of Pressure on Regression Rate of Axial-Injection End-Burning Hybrid Rockets

    齋藤勇士, 横井俊希, 嶋田泰三, 安河内裕之, 添田建太郎, 戸谷剛, 脇田督司, 永田晴紀

    日本航空宇宙学会年会講演会講演集(CD-ROM)　2016/04/14

  61. Verification of the throttling characteristics of axial-injection end-burning type hybrid rockets

    Yuji Saito, Toshiki Yokoi, Hiroyuki Yasukochi, Kentaro Soeda, Tsuyoshi Totani, Masashi Wakita, Harunori Nagata

    Proceedings of the International Astronautical Congress, IAC　2016/01/01

    More details Close

    Copyright © 2016 by the International Astronautical Federation (IAF). All rights reserved. The axial-injection end-burning type hybrid rocket originally proposed twenty years ago by Nagata and Hashimoto et al. recently recaptured the attention of researchers for its virtues such as constant ξ (oxidizer to fuel mass ratio) during firing and throttling operations. Previous studies revealed that, for combustion in a single-port fuel grain, the end-face regression rate in the axial direction is proportional to pressure, with a pressure exponent of 0.95. Accordingly, these rockets were expected to display good throttling characteristics. Given that no ξ shift occurs, keeping the oxidizer mass flow rate within 1% of its initial design point ensures specific impulse will remain within 97% of its design point. There are several requirements for realizing this type of hybrid rocket: 1) high fuel filling rate for obtaining an optimal ξ 2) small port intervals for increasing port merging rate; 3) ports arrayed across the entire fuel section. Because common manufacturing methods were unable to produce a fuel that satisfied these requirements, no previous researchers have conducted experiments with this kind of hybrid rocket. Recent advances in high-accuracy 3D printing have enabled such fuels to be produced for the first time. The fuel grains used in this study were produced by a high-precision light polymerized 3D printer. Each grain consisted of an array of 0.3 mm diameter ports for a fuel filling rate of 98%. Last year, the authors reported the results of multiple firing tests of an axial-injection end-burning type hybrid rocket using 3D printed fuel grains and verified that solid fuel regression rate is linearly dependent on pressure. In this study, the authors conducted a unique set of experiments to verify the throttling characteristics of the axial-injection end-burning type hybrid rocket. Oxidizer mass flow rate and chamber pressure were throttled during firings by actuating valves in a fluid circuit consisting of four oxidizer supply lines. Chamber pressure and oxidizer mass flow rate were measured during each firing. These experimental data were analyzed by a reconstruction technique to obtain ξ history. The results show that ξ remains almost constant during firing, even during throttling operations. Therefore, this study verifies that the axial-injection end-burning type hybrid rocket has superb throttling characteristics. Additionally, the study supports findings in previous research that indicate the pressure exponent is close to unity.

  62. Throttling characteristics of end-burning type hybrid rockets

    NAGATA Harunori, SAITO Yuji, YOKOI Toshiki, SHIMADA Taizo, YASUKOCHI Hiroyuki, SOEDA Kentaro, TOTANI Tsuyoshi, WAKITA Masashi

    The Proceedings of Mechanical Engineering Congress, Japan　2016

    More details Close

    <p>The authors have previously proposed the concept of end burning type hybrid rockets which would use cylindrical fuel grains consisting of an array of many small ports running in the axial direction through which oxidizer gas would flow. Because of difficulty in manufacturing a fuel grain that satisfied requirements such as high volumetric filling rate (above 0.97) and micro-sized port intervals, the end burning hybrid rocket had yet to be achieved. The authors succeeded to verify the novel end burning type hybrid rocket for the first time owing recent progress in 3D printing technology. This paper reports throttling firing tests to verify the excellent throttling characteristic of end-burning type hybrid rockets, that is, virtually no O/F shift during throttling.</p>

  63. Verification Firings of End-burning Type Hybrid Rockets International-presentation

    H. Nagata, H.Teraki, Y. Saito, R.Kanai, H. Yasukochi, M.Wakiata, T. Totani

    51st AIAA/SAE/ASEE Joint Propulsion Conference　2015/07

  64. Estimation of Hybrid Rocket Nozzle Throat Erosion History International-presentation

    Yuji SAITO, Tsutomu UEMATSU, Hikaru ISOCHI, Masashi WAKITA, Tsuyoshi TOTANI, Harunori NAGATA

    30th International Symposium on Space Technology and Science　2015/07

  65. Evaluations of Data Reduction Methods for Hybrid Rockets International-presentation

    H.Nagata, Y.Saito, T.Ishiyama, Y.Inaba, M.Wakita, T.Totani

    65th International Astronautical Congress　2014/09

Show all Show first 5

Industrial Property Rights 6

  1. SPACECRAFT-BORNE PROPULSION DEVICE

    KAWAGUCHI Junichiro, SAITO Yuji

    Property Type: Patent

  2. 固体燃料トーチ装置、ハイブリッドロケット燃焼システムおよびハイブリッドロケット燃焼方法

    Kamps Landon, 永田 晴紀, 池田 華子, 平井 翔大, 齋藤 勇士, 高梨 知広

    Property Type: Patent

  3. マルチモード推進装置および飛翔体

    齋藤勇士, 高橋和貴, 桒原聡文

    Property Type: Patent

  4. ハイブリッドロケットエンジン用着火装置、ハイブリッドロケットエンジン着火方法、およびロケット推進システム

    齋藤勇士, 桒原聡文, 喜田耕介, 亀山頌太, 長田泰一, 池田博英

    Property Type: Patent

  5. ハイブリッドロケットエンジンの固体燃料の時空間解析方法、時空間解析システム、および時空間解析プログラム

    齋藤勇士, 桒原聡文, 小林稜平

    Property Type: Patent

  6. ハイブリッドロケットエンジンの燃焼状態解析方法、燃焼状態解析システム、および燃焼状態解析プログラム

    齋藤勇士, 桒原聡文, 小林稜平

    Property Type: Patent

Show all Show first 5

Research Projects 15

  1. High time/space-resolved solid fuel regression and combustion mechanism of a hybrid propulsion system Competitive

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2023/04 - 2027/03

  2. Space Demonstration of Hybrid Thruster with 6-DOF Motion Control for Small Spacecraft Mobility Competitive

    Offer Organization: New Energy and Industrial Technology Development Organization

    Institution: Tohoku University

    2021/03 - 2027/03

  3. Biomass Space Propulsion Systems for Sustainable Space Exploration Competitive

    Yuji Saito, Yuta Nakayasu, Kayoko Kobayashi

    Offer Organization: Tohoku University

    System: Creative Interdisciplinary Collaboration Program

    Institution: Frontier Research Institute for Interdisciplinary Sciences

    2023/04 - 2025/03

  4. Low-O/F Hybrid Thruster for Long-firing Duration Space Orbit Maneuver Competitive

    Offer Organization: New Energy and Industrial Technology Development Organization

    Institution: Tohoku University

    2023/08 - 2024/02

  5. Data-driven-science-based spatio-temporal super-resolution measurement of a large scale turbulent structure of supersonic jet

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2020/04/01 - 2023/03/31

  6. データ駆動型スパースセンシングによる航空宇宙開発の飛躍

    Offer Organization: 科学技術振興機構（JST）

    System: 戦略的創造研究推進事業（ACT-X）

    2020/12 - 2023/03

  7. Next-generation flow control using the reduced-order model based on advanced unsteady flow measurement

    Asai Keisuke

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

    Institution: Tohoku University

    2019/10/07 - 2022/03/31

    More details Close

    The purpose of this joint research is to establish a new concept of flow control theory for controlling flows with large-scale vortex structures and shock-wave oscillations by means of dynamic feedback. In collaboration with a research group at the Florida State University (FSU) in the United States, both parties brought their knowledge and technology to the research and development of three key technologies: construction of an unsteady flow database based on high-precision advanced measurements, understanding of fluid phenomena based on reduced-order models of flow fields, and driving fast-response actuators. By conducting demonstration experiments using FSU's large-scale experimental facilities for a separated flow on the afterbody model and supersonic impinging jet on the ground plate, we have established a research foundation to realize a dramatic improvement in flow control capability, which was considered impossible by conventional methodologies.

  8. Measurement of unsteady flow generated by deformable object for understanding locomotion principle

    Asai Keisuke

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2019/04/01 - 2022/03/31

    More details Close

    The purpose of this study was to clarify the aerodynamic mechanism of locomotion caused by unsteady flow forces on a moving wing surface and to establish the experimental methods necessary for this purpose. By combining a pressure-sensitive paint (PSP) consisting of dye molecules having oxygen quenching properties with a lifetime measurement method and three-dimensional deformation measurement (VDM) using data assimilation, we developed a technique to image unsteady pressure distribution on a deforming wing surface and demonstrated its effectiveness in the benchmark experiments on a rotating wing and a flapping wing. Using the newly-developed techniques, we investigated the relationship between the large-scale separation vortex and the hydrodynamic forces acting on the wing surface, and obtained many insights into the mechanism by which a moving wing surface generates lift and thrust, paving the way to solving design problems that could not be solved by theory alone.

  9. 「アルミニウム-水」ハイブリッド燃焼を用いた推進系の開発

    Offer Organization: JAXA／宇宙探査イノベーションハブ

    System: TansaXチャレンジ研究

    Institution: 東北大学

    2020/12 - 2022/03

  10. 金属／水を用いたハイブリッドスラスタの燃焼機構の解明 Competitive

    齋藤 勇士

    Offer Organization: 日本学術振興会

    System: 研究活動スタート支援

    2018/10 - 2020/03

  11. Investigation of Combustion Mechanisms of Innovative Hybrid Rockets Competitive

    SAITO YUJI

    Offer Organization: TEPCO Memorial Foundation

    System: Support for International Technological Interaction

    2019/08 - 2019/08

  12. 拡大流路内を燃え拡がる対向流拡散火炎の吹き飛び限界に関する研究 Competitive

    齋藤 勇士

    Offer Organization: 公益財団服部報公会

    System: 工学研究奨励援助金

    2017/10 - 2018/10

  13. 端面燃焼式ハイブリッドロケットの燃焼機構の解明 Competitive

    齋藤 勇士

    Offer Organization: 日本学術振興会

    System: 特別研究員（DC2）

    2017/04 - 2018/03

  14. 端面燃焼式ハイブリッドロケットの燃料後退特性に関する研究 Competitive

    齋藤 勇士

    Offer Organization: 公益財団法人東電記念財団

    System: 奨学金

    2016/04 - 2017/03

  15. 平成28年度若手研究者海外渡航助成 Competitive

    齋藤 勇士

    Offer Organization: 一般財団法人総合研究奨励会

    2016 - 2016

Show all Show first 5

Teaching Experience 2

  1. 機械知能・航空実験Ⅱ　東北大学

  2. 機械知能・航空実験Ⅰ　東北大学

Social Activities 6

  1. 将来の宇宙開発を担うハイブリッドロケット

    ロクトサイエンスレクチャー2024 宇宙の最新研究に触れよう　多摩六都科学館

    2025/01/26 - 2025/01/26

  2. 大学研究者として、宇宙開発に貢献

    東北大学 大学案内 2025年度入学者用

    2024/04 - 2024/12

  3. 理科実験教室 アルコールロケットで燃焼試験をやってみよう！

    2024/08/25 - 2024/08/25

  4. 沼津工業高等専門学校「社会と産業」

    オンライン

    2023/10/19 - 2023/10/19

  5. 東北大学講演会－流体科学ってなんだろう？－

    オンライン

    2022/02/22 - 2022/02/22

  6. 沼津高専機械工学科4年生進路決定を控えた学生向けへのオンライン説明会

    オンライン

    2021/12/15 - 2021/12/15

Show all Show first 5

Media Coverage 11

  1. 東北から世界へ。異分野融合で学際的研究を開拓 ―学際科学フロンティア研究所

    東北大学総務企画部広報室　まなびの杜

    2025/05

    Type: Internet

  2. 2時間の計算を一瞬で実現！？宇宙機用ハイブリッドエンジンの実証に向けて世界をリード！

    Space Connect株式会社

    2024/04/09

    Type: Internet

  3. 【論文掲載】ハイブリッドスラスタの課題である 燃料と酸化剤の質量混合比（O/F）履歴を即座に取得できる方法を開発

    株式会社ElevationSpace

    2024/04/04

    Type: Internet

  4. 世界初の宇宙実証を目指す、小型人工衛星を地球に帰還させるための "ハイブリッドスラスタ"、実機に近い試験モデルによる長時間燃焼と、真空環境下での推力計測に成功

    東北大学

    2024/03/26

    Type: Internet

  5. 学際科学フロンティア研究所の齋藤勇士助教が宇宙科学奨励賞を受賞

    東北大学

    2024/03/12

    Type: Internet

  6. 世界初の宇宙実証へ向け、小型人工衛星を地球に帰還させるための高推力＆経済性＆安全性を兼ね備える"ハイブリッドスラスタ"、軌道離脱に必要な長時間燃焼に成功

    東北大学

    2023/08/25

    Type: Internet

  7. ハイブリッドスラスタへの着火技術に関する三者間共同研究契約の締結および燃焼実験の実施について

    株式会社ElevationSpace

    2023/03/23

    Type: Internet

  8. 高速な空気の流れをリアルタイム計測 従来比２０倍速を実現 ～変化する流体に呼応するアクティブ制御に期待～

    科学技術振興機構（ＪＳＴ）

    2022/08/30

    Type: Internet

  9. 自動車表面の風圧分布を瞬時に推定する技術を開発 ～自動運転車の安全性向上と燃費削減に期待～

    科学技術振興機構（ＪＳＴ）

    2022/06/24

    Type: Internet

  10. 2023年の軌道上実証を目指し、世界最高性能の小型推進装置の開発を加速 株式会社ElevationSpaceと東北大学の共同研究がNEDO「若サポ」に採択

    東北大学

    2022/04/21

    Type: Internet

  11. 世界初の小型宇宙利用プラットフォームを開発するElevationSpaceが東北大学と共同で世界最高性能の小型推進装置の開発を開始

    株式会社ElevationSpace

    2021/09/21

    Type: Internet

Show all Show first 5

Academic Activities 4

  1. 日本航空宇宙学会北部支部２０２５年講演会ならびに第６回再使用型宇宙輸送系シンポジウム

    東北大学片平キャンパス（さくらホール，流体科学研究所）

    2025/03/10 - 2025/03/10

    Activity type: Competition, symposium, etc.

  2. ICFD2024, OS4: Flow Dynamics and Combustion Technology of Hybrid Rocket Propulsion, 16th Edition

    Sendai International Center

    2024/11/19 - 2024/11/20

    Activity type: Academic society, research group, etc.

  3. The 75th International Astronautical Congress (IAC) C4 4 Solid and Hybrid Propulsion (2)

    Milan, Italy

    2024/10/14 - 2024/10/18

    Activity type: Academic society, research group, etc.

  4. ICFD2023, OS4: Flow Dynamics and Combustion Technology of Hybrid Rocket Propulsion, 15th Edition

    Sendai International Center

    2023/11/07 - 2023/11/07

    Activity type: Academic society, research group, etc.

Other 1

  1. 高圧ガス製造保安責任者（乙種機械）