流体微振动隔振器的热振耦合特性研究  

Study on thermo-vibration coupling characteristics of a type of fluid micro-vibration isolator

作　　者：王杰 苟仲秋[1] 赵寿根[2] 张永[1] 张柏楠[1] 魏传峰[1] WANG Jie;GOU Zhongqiu;ZHAO Shougen;ZHANG Yong;ZHANG Bainan;WEI Chuanfeng(Institute of Manned Space System Engineering,China Academy of Space Technology,Beijing 100094,China;School of Aeronautic Science and Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China)

机构地区：[1]中国空间技术研究院载人航天总体部,北京100094 [2]北京航空航天大学航空科学与工程学院,北京100191

出　　处：《振动与冲击》2020年第11期248-257,共10页Journal of Vibration and Shock

基　　金：国家重大科技专项工程。

摘　　要：隔振是一种航天器振动控制的重要方法,隔振器动力学特性的理论研究是隔振设计的重要基础。针对一种航天新型黏性流体微振动隔振器,基于非牛顿流体物理属性、隔振器宏观传热特性、运载火箭-卫星轴向振动特性,提出了发射段的隔振器及运载火箭-卫星-隔振器系统的非线性热-振耦合模型;通过自行设计基础激励试验测试平台,对不同环境温度下的流体阻尼系数和体积刚度系数进行测试,并将试验得到的阻尼、刚度数据输入隔振模型中进行仿真分析。研究结果表明,隔振系统具有时变性和非线性,流体黏性热导致共振频率漂移、共振幅值变化,隔振器性能与激励幅值、激励频率相关,需要采用新的“共振带”和“隔振带”的概念进行设计;理论模型和研究方法可为隔振器热振耦合特性评估、优化设计及工程应用提供理论依据和参考。Vibration isolation is an important method of spacecraft vibration control,and the theoretical study of the dynamic characteristics of vibration isolator is an important foundation of its design.In this paper,a new type of micro-vibration isolator which contains viscous fluid was studied.Based on the Non-Newtonian fluid property,macroscopic heat transfer characteristics of the isolator and the axial vibration behavior of a typical launch vehicle-satellite system,the nonlinear thermo-vibration coupling models of the isolator and the launch vehicle-satellite-isolator system during the launch stage were firstly proposed.Then the damping coefficients and volumetric stiffness coefficients under different temperature environments were measured with the self-designed base excitation test-setup,and these parameters were input into the above models to conduct a simulation.The results show that the behavior of the vibration isolation system is nonlinear and time-variant,and the fluid viscous heating can lead to the shift of resonant frequency and the fluctuation of resonant amplitude.Moreover,the performance of the isolator is also closely related to the excitation amplitude and excitation frequency.Two new conceptions,i.e.,resonant band and isolated band,should be adopted to design the isolator.Thus the presented theory and method can provide reference and theoretical basis for the thermo-vibration coupling characteristics evaluation,optimal design and engineering application of this type of fluid micro-vibration isolators.

关 键 词：流体微振动隔振器 黏性热 热振耦合特性 隔振性能 频率漂移 

分 类 号：V11[航空宇航科学与技术—人机与环境工程] O328[理学—一般力学与力学基础]