Dynamics Analysis of Active Variable Stiffness Vibration Isolator for Whole-Spacecraft Systems Based

• 作 者: Kefan Xu Yewei Zhang Yunpeng Zhu Jian Zang Liqun Chen
• 机 构: College of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, China;Department o
• 出 处: 固体力学学报（英文版）
• 发表日期: 2020年6期
• 关键词: Vibration isolation Active variable stiffness vibration isolator Nonlinear outpu

In order to improve the harsh dynamic environment experienced by heavy rockets during different external excitations,this study presents a novel active variable stiffness vibration isolator(AVS-VI)used as the vibration isolation device to reduce excessive vibration of the whole-spacecraft isolation system.The AVS-VI is composed of horizontal stiffness spring,positive stiffness spring,parallelogram linkage mechanism,piezoelectric actuator,acceleration sensor,viscoelastic damping,and PID active controller.Based on the AVS-VI,the generalized vibration transmissibility determined by the nonlinear output frequency response functions and the energy absorption rate is applied to analyze the isolation performance of the whole-spacecraft system with AVS-VI.The AVS-VI can conduct adaptive vibration suppression with variable stiffness to the whole-spacecraft system,and the analysis results indicate that the AVS-VI is effective in reducing the extravagant vibration of the whole-spacecraft system,where the vibration isolation is decreased up to above 65％under different acceleration excitations.Finally,different parameters of AVS-VI are considered to optimize the whole-spacecraft system based on the generalized vibration transmissibility and the energy absorption rate.