隔振器安装位置对卫星载荷隔振性能的影响研究

Effect of Installation Position of Isolators on Micro-Vibration Isolation Performance for Satellite Payload

研究了隔振器安装位置对星载系统隔振性能的影响。针对敏感载荷隔振系统,将隔振器安装位置位移转为敏感载荷在平动与转动方向上的自由度,建立了系统的动力学方程,分析了系统的自由响应和受迫响应,自由响应的结果验证了系统的耦合性以及仿真结果的正确性;受迫响应结果表明耦合系统会出现两个自由度的共振峰,也会出现反共振点。针对平动和转动自由度分别定义了力传递率和力矩传递率,并考虑两种典型隔振器安装位置进行分析,求解了对应于安装位置过质心的耦合系统以及安装位置不过质心的非耦合系统的传递率。发现耦合系统的隔振性能在某些频段和转动方向上优于非耦合系统。结论对微振动的工程设计有一定的参考价值。

The effect of installation position on the performance of vibration isolation system on borne was analyzed.Considering the vibration isolation system of sensitive payload,the isolation position of the isolator was transfered into translational and rotational degree of the payload.The dynamic equation of the system was established.The free and forced vibration responses of the system were analyzed.The result of free response has verified the existence of coupling in the system and the accuracy of the simulation result.Meanwhile,the result of forced response shows that the frequency resonance change from one to two accompanied with one anti-resonance point.For translational and rotational degree of freedom,the force transmissibility and moment transmissibility were defined.The two typical installation positions of the isolator were analyzed.The transmissibility was analyzed for both coupling and non-coupling systems respectively.It is found that the performance of the coupling system can be superior to the non-coupling system for different frequency range and isolation direction.The result can provide meaningful instruction to design micro-vibration isolation system in engineering.