Experimental Study of Kinetic Characteristics for Gid Fin Transmission Mechanism of Reusable Launch Vehicle

WANG Chen1, YUAN Wenquan1,3, GUO Yue1, ZHANG Hongjian1,†, WANG Xiaojun2,†, SHI Yuhong1

1. Beijing Institute of Astronautical Systems Engineering, Beijing 100076; 2. China Academy of Launch Vehicle Technology, Beijing 100076; 3. School of Astronautics, Harbin Institute of Technology, Harbin 150008; † Corresponding authors, E-mail: zhanghj@pku.edu.cn (ZHANG Hongjian), wangxj99@139.com (WANG Xiaojun)

Abstract Grid fin translation mechanism is the key actuator of trajectory and attitude control in reentry flight of the reusable launch vehicle. The kinetic characteristic of translation mechanism is investigated experimentally. An experimental device and experimental schemes comprise position test, transient state test and frequency test are set up. The linear displacement of servo piston rod and the angle displacement of rudder shaft are measured by the displacement sensors. Firstly, the cause of linear displacement abrupt change in position test and angle displacement vibration in transient state test is studied. Furthermore, small shaft turning angle frequency test in low, mid and high frequency are tested and the angle displacement signal delay are comparativly analyzed. The clearances in kinematic pairs are considered as the important affecting factor of kinetic characteristic of translation mechanism and its influencing mechanism is preliminarily proposed. The results provide research object and experimental fundament for farther dynamic analysis and optimal design of transmission mechanism. Key words reusable launch vehicle; grid fin; transmission mechanism; clearance influence