机载多框架光电吊舱两级隔振设计

Study on Two-Level Vibration Isolation Based on Multi-Frame Airborne Optronic Payload

在分析了目前常用的机载光电设备-振系统的基础上,针对两轴四框架的结构特点,提出了一种基于多框架的两级-振方案,克服了目前-振系统体积、重量大,加工装配要求高的缺点。基于-振模型的理论计算表明,根据系统给定的质量比和频率比,优化选择内外框架的刚度比,即选择合适的内外框隔振器可达到理想的隔振效果。通过某型光电吊舱的扫频实验证明该隔振系统原理正确,设计合理,能够满足高精度光电吊舱的使用要求。

Vibration dampers commonly used for airborne optronic payload are presented in this paper. One type of twoqevel multi-frame based vibration isolation conception is proposed for a payload featuring two-axis four-frame structure to over- come the shortcomings of currently used vibration damper, such as big size, heavy weight, and high accuracy manufacturing and assembly. It is shown by theoretic calculation based on vibration isolation model that ideal vibration isolation can be a- chieved by selecting proper internal-external frame vibration damper depending on quality ratio and frequency ration given by the system and optimizing the rigidity ratio of internal-external frame. It is proved by a frequency sweep test performed on a type of airborne optronic payload that this vibration isolation conception is theoretically correct and reasonably designed up to the appliaeiotn requirement of high accuracy airborne optronie payload.