月基对地观测跟踪转台设计与分析

针对登月过程严酷的力学条件、月球表面复杂的环境特征以及严格的重量要求,设计了一种可适用于月基观测的跟踪转台.该转台主要由水平轴系及驱动机构和竖直轴系及驱动机构组成,采用霍耳元件作为位置检测元件,其综合指向准确度≤0.1°.基于有限元分析方法确定转台结构方案、优化主要支撑件结构及合理选材,并对驱动机构与轴系对转台刚度、温度适应性和指向准确度的影响做了深入分析与计算.同时进行了整机的力学模拟试验和运动机构的高低温试验,一阶谐振频率为49 Hz,在-40 ℃ ～+80 ℃温度范围内工作正常.结果表明转台各项性能指标满足工程任务要求,具有结构紧凑、可靠性高、重量轻的特点.

Design and Analysis of Lunar-based Tracking Turntable for Earth Observation

Aiming at the mechanical condition during the moon landing,complex environment lunar surface features,and strict weight requirements,a tracking turntable for lunar-based earth observation was designed which consists of two main components: horizontal shaft and elevation actuator modules,and vertical shaft and azimuth actuator modules.In addition,Hour sensors were selected as the rotation position detector of elevation and azimuth shafts,and the pointing accuracy is better than 0.1°.An effective tracking turntable design configuration,optimized structure of supporter and selection of material were performed based on the finite element analysis method,and the stiffness of axis system and transmission accuracy of actuator module were analyzed to obtain the trade-off design with better capabilities of deep space environmental adaptability.To qualify the design for the specific mission requirements,the vibration and thermal vacuum tests were carried out with the result of 41 Hz eigenfrequencies and the required running temperature changing range (—40℃~+80℃).The experimental results show that the proposed design has advantages of compact volume,light weight and high reliability.