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

摘要：

为了研究栅格舵传动机构的动态特性, 搭建栅格舵传动机构的实验装置, 设计位置特性、瞬态特性和频率特性3种实验方案, 通过位移传感器, 测量伺服活塞杆的线位移和舵轴转动的角位移时域信号。分析位置特性实验线位移信号突变和瞬态特性实验角位移信号震荡现象的成因, 进行低、中、高3个频率的小转角频率特性实验, 并对频率特性实验中出现的角位移信号滞后现象进行定量分析, 判断出传动机构动态特性的重要影响因素是运动副间隙, 并初步提出其影响机理, 为进一步的动力学分析和优化设计提供良好的研究对象和实验基础。

关键词: 重复使用火箭, 栅格舵, 传动机构, 间隙影响