|
Affiliation |
Graduate School of Engineering Science Cooperative Major in Sustainable Engineering |
HIRAYAMA Hiroshi
|
|
|
Research Interests 【 display / non-display 】
-
satellite
-
space engineering
-
electric aircraft
Graduating School 【 display / non-display 】
-
1988.04-1992.03
The University of Tokyo Graduated
Graduate School 【 display / non-display 】
-
1994.04-1997.03
The University of Tokyo Graduate School, Division of Engineering Doctor's Course Accomplished credits for doctoral program
-
1992.04-1994.03
The University of Tokyo Graduate School, Division of Engineering Master's Course Completed
Campus Career 【 display / non-display 】
-
2022.04-Now
Akita University Graduate School of Engineering Science Cooperative Major in Sustainable Engineering Lecturer
-
2020.04-2022.03
Akita University Graduate School of Engineering Science Department of Systems Design Engineering Mechanical Engineering Course Lecturer
-
2017.03-2020.03
Akita University Graduate School of Engineering Science Department of Systems Design Engineering Creative Engineering Course Lecturer
External Career 【 display / non-display 】
-
2009.03-2009.06
Bremen University Center of Applied Space Technology and Microgravity Researcher
-
2007.04-2017.02
Kyushu University Faculty Of Engineering Assistant Professor
-
2000.04-2007.03
Kyushu University Faculty Of Engineering Research Assistant
-
1999.04-2000.03
Kyushu University Faculty Of Engineering Research Assistant
-
1997.04-1999.03
Kyushu University Faculty Of Engineering Research Assistant
Academic Society Affiliations 【 display / non-display 】
-
1997.04-Now
Japan
Japan Society for Aeronautical and Space Scienxces
-
2006.06-Now
Japan
Japan Society of Mechanical Engineers
-
1996.04-Now
Japan
Japanese Rocket Society
-
2003.02-Now
Japan
University Space Engineering Consortium
-
2014.10-Now
Japan
Space Solar Power Systems Society
Research Areas 【 display / non-display 】
-
Frontier Technology (Aerospace Engineering, Marine and Maritime Engineering) / Aerospace engineering
Qualification acquired 【 display / non-display 】
-
Land Special Radio Engineer (1-3 class)
-
Floor Above Operation Type Crane Skilled Person
-
Hang Up and Remove Work Skill Person
Thesis for a degree 【 display / non-display 】
-
Development of an Automatic Truss Beam Builder for Verification in the Gravity Condition on the Ground
48 ( 561 ) 315 - 321 2005.03
Domestic Co-author
-
Adaptive Switching of Connections between Solar Arrays to Drive a DC Motor Efficiently for Space Robots
Hiroshi Hirayama, Kenji Nakano
Proceedings of 22nd International Symposium on Space Technology and Science 2000 717 - 722 2005.03
Domestic Co-author
-
Development of an Automatic Truss Beam Builder for Verification on the Ground
Hiroshi Hirayama, Naohiro Inagaki
Proceedings of 21st International Symposium on Space Technology and Science 1998 98-b-12 2005.03
Domestic Co-author
Research Achievements 【 display / non-display 】
-
Stochastic Analysis of Survivability of Triple Net Tether
Hiroshi HIRAYAMA, Shintaro TAN
Journal of Evolving Space Activities ( 日本航空宇宙学会 ) 2 ( 0 ) n/a 2024.07 [Refereed]
Research paper (journal) Domestic Co-author
A calculation method to estimate the survivability of a net-like tether system is explained in this paper. An electrodynamic tether is a candidate device to decelerate orbital debris without propellant. The major problem with using a tether in space is its vulnerability against collisions by space debris. Some conceptual designs are proposed to enhance the survivability of tether, such as tape tether, multiline tether, or net-type tether. Authors formulated the survivability of multi-segmented double-line tether in the preceding study. In this study, the calculation method is extended to treat a net-type triple tether which has been developed for the EDT by JAXA. The procedure of the calculation is as follows. First, fatality rates of each element in net-type tether are calculated by integrating differential flux multiplied by cross-sectional area, then survivabilities of each tether element are obtained as a function of time. Next, considering the topology of the net, probabilities along possible severing paths are summed up, and the survivability of the whole tether is obtained. At last, a simplified method with desirable precision and faster computation time is introduced. The numerical example shows that the net tether has much higher survivability than the double tether.
-
Yutaka Terao, Hiroshi Hirayama, Hirotaka Sugawara, Hitoshi Oyori
2022 International Power Electronics Conference, IPEC-Himeji 2022-ECCE Asia ( 2022 International Power Electronics Conference, IPEC-Himeji 2022-ECCE Asia ) 2135 - 2140 2022.07 [Refereed]
Research paper (international conference proceedings) Domestic Co-author
-
Attitude Control Simulator for the Small Satellite and Its Validation by On-orbit Data of QSAT-EOS
Masayuki Katayama, Yuta Suzaki, Shigeru Aso, Hiroshi Hirayama
AIAA/USU Conference on Small Satellites SSC17-P1-17 2017.08
Research paper (international conference proceedings) Domestic Co-author
The role of the microsatellites has become significant due to the progress of performance and miniaturization of the electronics devices. For the purpose of earth observation the constellation flight of the microsatellites has made it possible to obtain the continuous data of the designated location and it is expected that the data be utilized in wide variety of the filed such as science, agriculture, industries, and climate monitoring. As the microsatellites take the LEO, the time of observation on the designated location is limited. Therefore the agile and precise pointing performance is required so as the attitude control accuracies. This paper presents the development of the attitude control simulator for the microsatellite for the use of design of the attitude control subsystem. Quaternion feedback control is proved to be effective and stable. Then the on-orbit data of the QSAT-EOS (Kyushu Satellite for Earth Observation System Demonstration) is analyzed to confirm the effectiveness of the quaternion feedback control. QSAT-EOS was launched in 2014 and now is in the deorbit phase after two year operation. Results of the on-orbit data analysis have suggested some necessities of improvement of the simulator and control algorithm which are the future subject.
-
Lecture on Rockets:(History and Technology)
Hiroshi Hirayama
2019.09
Lecture materials etc. (seminar, tutorial, course, lecture and others) Single author
◆Original paper【 display / non-display 】
◆International conference proceedings【 display / non-display 】
◆Other【 display / non-display 】
Presentations 【 display / non-display 】
-
Stochastic State Variable Model to Evaluate Survivability of Net-type Tether
Hiroshi Hirayama,Subaru Suzuki
(Himeji) 2024.11 - 2024.11 Japan Society for Aeronautical and Space Sciences
-
Analytic Response of Redundant Flight Control Actuator in Jamming Failure
Hiroshi Hirayama, Megumi Watanabe, Riho Sawada, Taiga Kudo
61st Aircraft Symposium (Kitakyushu) 2023.11 - 2023.11 Japan Society for Aeronautical and Space Sciences
-
Investigation and Evaluation of Flywheel Battery Model Sizing for Aircraft Electrification
Megumi Watanabe, Riho Sawada, Taiga Kudo, Hiroshi Hirayama
61st Aircraft Symposium (Kitakyushu) 2023.11 - 2023.11 Japan Society for Aeronautical and Space Sciences
-
Applied Velocity Changes Using the Patched-Conic Approximation for Permanent Removal of Orbital Debris from Geostationary Orbit
Kento Komatsu, Hiroshi Hirayama
32nd Space Engineering Conference (Semboku) 2023.11 - 2023.11 The Japan Society of Mechanical Engineers, Space Engineering Division
-
Application of Deep Learning to On-orbit Observation of Micro-debris Impact Features
Hiroshi Hirayama, Motoharu Nakayama, Kengo Saito
32nd Space Engineering Conference (Semboku) 2023.11 - 2023.11 The Japan Society of Mechanical Engineers, Space Engineering Division
Academic Activity 【 display / non-display 】
-
Japan Society for Aeronautical and Space Scienxces
2018.03-Now -
Japan Society for Aeronautical and Space Scienxces
2005.04-Now -
Japan Society for Aeronautical and Space Scienxces
2007.03-Now -
Space Solar Power Systems Society
2015.04-Now -
Japan Society of Mechanical Engineers
2023.04-Now