Dynamics of a passive micro-vibration isolator based on a pretensioned plane cable net structure and fluid damper

13th International Conference on Motion and Vibration Control; 12th International Conference on Recent Advances in Structural Dynamics

Chen, Yanhao^1 ; Lu, Qi^1 ; Jing, Bo^1 ; Zhang, Zhiyi^1

Institute of Vibration, Shock and Noise, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai

200240, China^1

关键词: Cable net structures;    Equivalent damping coefficient;    Frequency response functions;    Modelling and experiments;    Passive vibration isolator;    Resonance amplification;    Resonance frequencies;    Vibration attenuation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/744/1/012226/pdf
DOI  :  10.1088/1742-6596/744/1/012226

来源: IOP

【 摘 要 】

This paper addresses dynamic modelling and experiments on a passive vibration isolator for application in the space environment. The isolator is composed of a pretensioned plane cable net structure and a fluid damper in parallel. Firstly, the frequency response function (FRF) of a single cable is analysed according to the string theory, and the FRF synthesis method is adopted to establish a dynamic model of the plane cable net structure. Secondly, the equivalent damping coefficient of the fluid damper is analysed. Thirdly, experiments are carried out to compare the plane cable net structure, the fluid damper and the vibration isolator formed by the net and the damper, respectively. It is shown that the plane cable net structure can achieve substantial vibration attenuation but has a great amplification at its resonance frequency due to the light damping of cables. The damping effect of fluid damper is acceptable without taking the poor carrying capacity into consideration. Compared to the plane cable net structure and the fluid damper, the isolator has an acceptable resonance amplification as well as vibration attenuation.