42 Structural Design and Verification of Aeronomy Study Satellite ALE-1 By Pasith TANGDHANAKANOND, 1) Toshinori KUWAHARA, 1) Yoshihiko SHIBUYA, 1) Tomoyuki HONDA, 1) Alperen Ahmed PALA, 1) Shinya FUJITA, 1) Yuji SATO, 1) Tomomasa SHIBUYA 1) , and Koh KAMACHI 2) 1) Department of Aerospace Engineering, Tohoku University, Sendai, Japan 2) ALE Co., Ltd., Tokyo, Japan (Received July 12th, 2019) ALE-1 is a collaborative microsatellite project between ALE Co., Ltd. and Tohoku University. The mission objective of ALE-1 is to perform an aeronomy study by generating artificial meteors. Due to the uniqueness of the mission and an extremely limited development time, the project posed many challenges in the structural subsystem point of view. To cope with this, several key design concepts were proposed in the preliminary design phase. Moreover, ALE-1 is the first microsatellite developed by Space Robotics Laboratory (SRL) of Tohoku University to be launched by JAXA Epsilon rocket. Being a secondary payload of this rideshare, ALE-1 was launched in the sideway configuration. This is an unconventional way of launching microsatellite and is necessary to consider in the design process. Verification of the structural design of ALE-1 was also conducted by software simulation and environmental tests. Finite element method was implemented in the design process. Environmental test such as shock test, vibration test, and mass property test were also conducted to verify the launch survivability of the satellite structure. This paper aims to use ALE-1 as a demonstration of a microsatellite development with unique mission for Epsilon rocket in the structural subsystem point of view. Key Words: Structural Design, Mass Property Test, Vibration Test, Artificial Meteors, Epsilon Rocket Nomenclature CM x : distance from the origin to the line of force, m D : bolt circle diameter, m F x : axial force, N f : natural frequency of the satellite, Hz G MAX : maximum acceleration, G M x : maximum torsional moment, Nm n : number of bolts PSD : power spectral density, G 2 /Hz P eq : maximum axial load per bolt, N/bolt Q : magnification response S MAX : maximum shear load per bolt, N/bolt V : force in orthogonal direction, N Subscripts LB : Lightband RMS : root mean square SC : spacecraft 1. Introduction ALE-1 (Fig. 1) is a collaborative microsatellite project 1) between ALE Co., Ltd. and Tohoku University. ALE Co., Ltd is responsible for the development of artificial meteors unit, which is the main payload of ALE-1. The mission of the project is to perform an aeronomy study by generating artificial meteors 2) from this unit. On the other hand, Tohoku University is responsible for the development of bus system of the satellite. The two systems initially did not exist and had Fig. 1. Models of ALE-1. The order is from left to right: Mechanical Test Model, Engineering Model, and Flight Model. to be developed independently in parallel. The artificial meteors unit was designed to maximize the carrying capacity of the artificial meteor particle called “pellets”. 3) This caused the payload hardware to be relatively large in mass and posed a critical issue on the satellite mass budget. Despite the project mission being the first of its kind, the total development time available was only 2 years. This is because of a strict launch window deadline specified by Innovative Satellite Technology Demonstration-1 project of JAXA. ALE-1 was successfully launched by JAXA Epsilon Rocket from Uchinoura Space Center on January 18th, 2019. 4) In this launch, ALE-1 is a secondary payload, and was unconventionally launched in the sideway configuration. The initial orbit altitude is 500 km due to primary payload requirement. Releasing artificial meteor pellets at this altitude poses a threat on astronauts in the International Space Station (ISS). Therefore, ALE-1 is equipped with drag-sail like Separable De-Orbit Mechanism 5,6) (SDOM). The drag-sail will © 2021 The Japan Society for Aeronautical and Space Sciences Trans. JSASS Aerospace Tech. Japan Vol. 19, No. 1, pp. 42-51, 2021 DOI: 10.2322/tastj.19.42
Structural Design and Verification of Aeronomy Study Satellite ALE-1
Jun 14, 2023
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