机载光电平台隔振系统振动耦合分析

为避免载机线振动耦合为光电平台角振动，减小角振动对成像质量和指向精度的影响，对机载光电平台隔振系统进行了分析与研究。针对以往单自由度振动模型仅能分析线振动衰减，无法分析线振动与角振动耦合的缺点，建立了隔振系统的双自由度振动模型，推导出载机线振动与光电平台角振动间的传递函数，分析了减振器刚度、阻尼参数偏差以及减振器布局不合理对振动耦合的影响，为隔振系统的设计和安装提供理论基础。结合工程实际，提出了减小光电平台隔振系统振动耦合的具体措施。

Analysis of Coupled Vibration in Isolation System for Airborne Optoelectronic Pod

In order to prevent translational aircraft vibratory disturbances from transforming into angular vibration of optoelectronic pod and reduce the influences of angular vibration on the image quality and accuracy of line-of-sight(LOS), a passive isolation system was analyzed and developed. For the point that angular vibration transmissibility could not be analyzed with the model of single degree of freedom, a mathematical model of two degree of freedom vibration isolation system was established. The transfer function between translational aircraft vibration and rotational responses of optoelectronic pod was derived. The coupled vibration in isolation system with stiffness error , damping error and unreasonable layout were analyzed.These analyses provided theoretic basis for the design and assembly of the vibration isolation system. Finally, combining engineering practices, the methods to reduce angular vibration from aircraft linear vibration were proposed.