机载光电吊舱无角位移隔振设计

Irrotational displacement vibration isolation on airborne optoelectronic pod

为减小振动对机载光电吊舱成像质量和稳定精度的影响,依据平行四边形原理、隔振理论及吊舱模态分析数据设计了无角位移隔振装置,该隔振装置能够将载机振动引起的角位移转化成线位移并有效地抑制线振动。对无角位移隔振装置进行了动态仿真分析,仿真结果显示最大线位移仅为0.7 mm,并能够在较短时间内迅速地衰减。利用光学测量法测量了无角位移隔振装置的减振效果,测量结果表明无角位移隔振装置最大角位移为10″,与以往采用金属减振器的隔振方式相比减振效果提高了一个数量级,基本实现了无角位移,减振效果非常明显。外场试飞图像效果也验证了无角位移隔振装置减振的有效性。

To reduce the airborne vibration influence of airborne optoelectronic pod on quality and stability, the irrotational displacement vibration isolation device was designed according to the parallelogram principle, vibration isolation theory and the analysis data of pod modal. This vibration isolation device can make the angular displacement caused by onboard vibration into line and reject the iinear vibration effectively. The simulation results of dynamic simulation analysis on irrotational displacement vibration isolation device show that the biggest displacement is only 0.7 mm and it can decay quickly in a short time. The damping effects of irrotational displacement vibration isolation device on the basis of optical measurement indicate that the biggest angular vibration of the device is 10″. Compared with past vibration isolation mode adopted for metal vibration damper, this damping effect raises two magnitude orders and basically realize the irrotational displacement, and also improves the imaging quality of the optical system greatly. The field test image effects also prove the damping effectiveness of irrotational displacement vibration isolation device.