飞轮微振动的准零刚度多向隔振方法  

Quai-zero-stiffness multi-direction isolation method for the micro-vibration isolation of flywheels

作　　者：余松 黄可凡 蒋建平 YU Song;HUANG Kefan;JIANG Jianping(School of Aeronautics and Astronautics,Sun Yat-sen University,Shenzhen 518107,China)

机构地区：[1]中山大学航空航天学院,广东深圳518107

出　　处：《振动与冲击》2022年第2期123-129,共7页Journal of Vibration and Shock

基　　金：国防科技大学装备综合保障技术重点实验室基金(61420030402)。

摘　　要：针对航天器飞轮微振动的低频隔振难题,提出了基于准零刚度机理的多自由度非线性隔振方法。建立基于准零刚度支杆的Stewart隔振平台的动力学模型,通过增量谐波平衡(incremental harmonic balance,IHB)法分析了支杆刚度、激励力和力矩幅值对隔振性能的影响。在四自由度飞轮线性扰动模型的基础上,建立飞轮和隔振平台的耦合动力学模型,并用数值仿真分析了隔振效果。结果表明:该隔振方法能避免传统线性隔振在低频处的扰动放大现象,提升低频隔振性能,实现飞轮的全转速隔振,并且飞轮角位移响应幅值能满足动量矩矢量的指向精度要求。In order to solve the low-frequency micro-vibration isolation of flywheels in spacecrafts,a multi-degree-of-freedom nonlinear vibration isolation method based on quasi-zero-stiffness mechanism was proposed.The dynamic model of a Stewart vibration isolation platform supported by quasi-zero-stiffness struts was established.Influences of the strut’s stiffness and excitation amplitude on the vibration isolation performance were analyzed using the incremental harmonic balance(IHB)method.Based on a flywheel’s four-degree-of-freedom linear disturbance model,a coupling dynamic model of the flywheel and vibration isolation platform was established.The vibration isolation effect was analyzed using numerical simulation.The results show that the vibration isolation method can avoid the disturbance amplification of traditional linear vibration isolators at low frequency,improving the low-frequency vibration isolation performance and achieving flywheel’s full-speed vibration isolation.Meanwhile,the angular displacement response amplitude of the flywheel can meet the pointing accuracy requirement of the angular momentum vector.

关 键 词：飞轮微振动 非线性隔振 准零刚度 六自由度隔振平台 增量谐波平衡(IHB)法 

分 类 号：O328[理学—一般力学与力学基础]