Analysis of influence of stiffness characteristics on vibration and shock isolation performance of eight-element isolator

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (11) : 288-294.

GAO Peng1,2, DU Zhipeng1,2, ZHANG Lei1,2, YAN Ming1

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Abstract

In order to improve the protective capability of isolator of inertial navigation equipment, a multi-element parallel isolator was designed, which can unload impact loads in any direction by a large margin, and a disc spring which can bear large loads with small deformation was selected as an elastic element. At the same time, quasi-static compression test, vibration test and impact test were carried out to analyze the stiffness characteristics of isolator and its influence on isolation performance. It is found that with the increase of the number of disc springs in a single spacer, the preload increases，and the quasi-zero stiffness characteristic of the elastic component is gradually stronger, and then the vertical and horizontal vibration isolation capabilities are weakened to varying degrees. In the study of the isolation performance, when the quasi-zero stiffness characteristics are more obvious, the peaks of the acceleration response obtained by the test and simulation are larger, but with the increase of the impact load, the isolation rate tends to be stable. Finally, when the elastic element has weak quasi-zero stiffness characteristics, it is beneficial to ensure that the isolator keeps good vibration isolation and shock isolation ability under complex impact environment, which provides a reference for the optimal design of multi- element parallel isolator.

Key words

isolator / Disc spring / quasi-zero stiffness / anti-shock performance

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GAO Peng1,2, DU Zhipeng1,2, ZHANG Lei1,2, YAN Ming1. Analysis of influence of stiffness characteristics on vibration and shock isolation performance of eight-element isolator[J]. Journal of Vibration and Shock, 2020, 39(11): 288-294

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