机载光电侦察平台复合减振设计

Vibration damping design for airborne electro-optical surveillance platform

为减小振动对机载光电侦察平台成像质量和稳定精度的影响,对光电平台进行了复合减振设计。分析了复合减振原理,针对以往单级隔振系统存在的缺点在平台内框架和外框架之间设计了二级减振系统,更加有效地隔离了外框架传递到内框架上的振动。采用二维参数优化方法计算出了复合减振系统的最优固有频率比fopt为1.43,最优阻尼比ζopt为0.243。最后,通过振动试验验证了光电平台复合减振效果。与以往单级隔振系统相比,复合减振系统的最大振动传递率降低了50%,振动传递率小于1的频率范围更宽,高频时传递率的衰减程度也大大优于单级隔振系统。得到的结果表明了光电平台复合减振设计的合理性和有效性。

In order to reduce the influence of vibration on the image quality and precision stability of a airborne electro-optical surveillance platform,a vibration damping design was performed.Based on the detailed analysis of complex damping theory,a two-grade damping system between the inter and outer frames of the platform was designed to isolate the vibration from inter frame to outer frame effectively in view of the shortcoming of the single-stage vibration isolation system.By using the two-dimensional parameter optimization method,the optimum natural frequency ratio fopt and the optimum damping ratio ζopt of the vibration damping system were calculated to be 1.43 and 0.243,respectively.Finally,the vibration damping effect was illustrated through a vibration test.Compared with the previous single-stage vibration isolation system,experimental results show that the maximum vibration transmissibility of vibration damping system is lower by 50%,the frequency range of vibration transmission rate less than 1 is wider,and the amplitude range of transmissibility on high frequency is much better than that of the single-stage vibration isolation system.It is concluded that the vibration damping design is feasible and effective for electro-optical surveillance platforms.