基于压电堆和粘弹性材料的新型整星混合隔振系统

摘　要：为了降低振动载荷对卫星的影响，采用压电堆和粘弹性材料作为主被动隔振元件，设计一种新型的整星混合隔振系统，并对其隔振原理进行理论分析。通过有限元方法建立该隔振系统的有限元模型并分析其频率响应特性，根据分析结果，运用特征系统实现算法获取系统的最小阶状态空间模型来设计控制器，完成离线仿真。在此基础上，对低柔性模拟卫星进行整星混合隔振试验。仿真和试验结果表明，整星混合隔振系统能够有效地降低运载火箭传递到卫星的振动载荷。与整星被动隔振系统相比，整星混合隔振系统对低频振动分量具有显著的抑制作用，证明了该隔振系统的可行性和有效性，大大提高了卫星的安全性和可靠性。

New type of whole-spacecraft hybrid vibration isolation system based on piezoelectric stacks and viscoelastic material

To reduce the impact of vibrations on the satellite,a new type of whole-spacecraft hybrid vibration isolation system(WSHVIS) was designed and its vibration isolation principle was analyzed theoretically.Piezoelectric stacks and viscoelastic materials were employed as active and passive vibration isolation devices in the system.Finite element model of WSHVIS was established and its frequency response was analyzed.According to the analysis results,a minimum-order state-space model of WSHVIS was obtained by using eigensystem realization algorithm.On this basis,simulations and experiments were performed aiming at inspection of the low-flexible simulated satellite.The results show that WSHIVS can effectively inhibit the vibrations transmitted from launch vehicle to satellite.Comparing with the whole-spacecraft passive vibration isolation system,WSHVIS has a significant inhibitory effect on low-frequency vibration,and greatly improve the safety and reliability of satellite.