柔性轴在卫星光通信中的使用与优化设计

Application and optimum design of flexible shaft in satellite optical communication

针对卫星光通信粗跟踪系统中机械轴存在空回、轴系摩擦、轴间隙的不足的问题,提出采用柔性轴支撑光端机的方案。首先介绍了采用柔性轴卫星光通信的原理;然后分析了柔铰工作方向的柔度、最小切割处应力特性;从关键点挠度出发推导了回转误差角表达式,并分析了回转误差角对捕获性能的影响;在柔性轴特性研究的基础上,采用遗传算法对柔性铰链进行了优化设计。设计结果为:柔性铰链工作方向柔度0.768 rad/N·m,最小切割处应力1.768e+8 Pa,回转误差角343μrad;最后采用有限元法对设计结果进行了验证,三项指标的相对误差均小于3.5%,证明设计是可靠的。研究内容可为采用柔性轴的卫星光通信系统设计提供一定参考。

For the shortcomings of backlash shaft, friction and clearances in coarse tracking system of satellite optical communication, a scheme of using a flexible shaft to support the terminal was presented.The principle of flexible shaft in satellite optical communication was presented. Then the characteristics of flexibility in working direction and stress in thinnest incision were analyzed. According to the key point deflection, the rotation error angle expression was derived and its influence on capture probability was analyzed. Based on the research of flexible shaft characteristics, the flexible hinge was optimized by genetic algorithm. The results are as follows: the flexibility in working direction is 0.768 rad/N·m, the stress of thinnest incision is 1.768 e +8 Pa and the rotary error angle is 343 μrad. Finally, the finite element method was utilized to verify the design consequences, the relative error of the three indexes was less than 3.5%, which proved that the design was reliable. This study can provide some reference for flexible shaft design in satellite optical communication terminal.