Analysis of structure and shock isolation characteristics of 8-bar isolator

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (9) : 160-165.

ZHANG Lei1,2, GAO Peng1,2, YAN Ming1, DU Zhipeng1,2

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Abstract

In order to improve the protective capability of isolator of inertial navigation equipment, based on the concept of Stewart platform, an 8-bar isolator was proposed to be able to greatly unload impact load in any direction.The isolator could significantly improve the protection ability of inertial navigation equipment.Firstly, stiffness characteristics of the structure were analyzed, and it was found that its static stiffness is consistent with the theoretical design value.Based on vibration tests, it was concluded that the natural frequency of the structure meets design requirements, and its vibration isolation effect is better.At the same time, based on large number of shock tests and simulation, through analyzing equipment response peaks and isolation rate, it was proved that the structure has better shock isolation performance, and its horizontal direction is more prominent.The simulation and test data were used to draw the structure’s shock response spectrum, it was concluded that the shock isolation ability of the structure in frequency domain is also significant.In summary, it was shown that in time domain and frequency domain, the 8-bar isolator has stronger shock isolation ability; the analysis of structure and shock isolation characteristics of the isolator can provide a reference for optimal design of the isolator.

Key words

isolator / dynamic stiffness / shock isolation performance / frequency domain analysis

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ZHANG Lei1,2, GAO Peng1,2, YAN Ming1, DU Zhipeng1,2. Analysis of structure and shock isolation characteristics of 8-bar isolator[J]. Journal of Vibration and Shock, 2021, 40(9): 160-165

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