Systems Engineering and Electronics ›› 2020, Vol. 42 ›› Issue (6): 1348-1357.doi: 10.3969/j.issn.1001-506X.2020.06.19

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Thrust vector measurement method of micro-nano satellite solid rocket thruster

Pengjun QIAN(), Zhengliang LU(), Wenhe LIAO()   

  1. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
  • Received:2019-08-15 Online:2020-06-01 Published:2020-06-01
  • Supported by:
    国家自然科学基金(61803204);江苏省自然科学基金(BK20180465);江苏省研究生科研与实践创新计划项目(KYCX19_0260);民用航天“十三五”预研项目资助课题

Abstract:

Solid rocket thruster has many advantages when applied to micro-nano satellites, but the thrust vector of such a kind of small solid rocket thruster is difficult to measure. A method for mapping the thrust vector by using the inertial sensor measurement value through the ground dynamic flight test is proposed to solve the problem. Firstly, the dynamics model of the ground test system is established by the Newton-Euler method and the variable mass theory, and the dynamics and kinematics characteristics of the satellite are analysed. Then the measurement equation of the inertial measurement unit (IMU) is constructed, and the thrust measurement model is deduced by the mapping relationship between the thrust vector and the measurement value of the inertial sensor. Finally, the error sources affecting the measurement accuracy of the thrust vector are analyzed by simulations, and the installation configuration of the inertial sensor is optimized. Through numerical simulation experiments, the measurement method after optimization can ensure that the measurement accuracy of the main thrust and the lateral thrust is better than 0.3%.

Key words: micro-nano satellite, solid rocket thruster, variable mass, dynamic model, thrust measurement

CLC Number: 

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