光电跟踪系统结构动态特性分析及优化

Structure Analysis and Its Optimization of Photoelectric Seeking System Under Vibration

针对光电跟踪系统在振动冲击环境条件下结构发生变形导致跟踪精度下降的问题,应用Ansys软件对其结构动态特性进行分析和优化.建立了结构有限元模型,通过应用激光测振仪测试系统在约束情况下的固有频率和振型,验证了有限元模型的正确性与合理性.对系统在给定振动冲击环境条件下,反射镜与各姿态轴之间最大相对转角和角速度进行了数值模拟.通过对基座与反射镜进行结构优化,使系统在满足轻量化要求条件下,反射镜与各轴的最大相对角速度满足了指标要求,从而保证了系统的跟踪精度.

As the tracking precision of photoelectric seeking system decreases with the structural distortion under vibration and impact shock, it is essential to study the dynamic characteristics and to optimize the structure system using Ansys software. The structure＇s finite element analysis （FEA） model was established and its feasibility was validated by modal testing results with laser Doppler velocimetry （LDV）. On the basis of the simulation results under impact shock conditions, the relations of angle and angular velocity of reflector to the attitude axle are clarified and the structure is optimized to meet the design requirements.