Shock response of a vibration isolation system with displacement restrictors

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (21) : 172-177.

LIU Haichao1, YAN Ming1, FENG Linhan2

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Abstract

In order to improve impact resistance of shipborne equipment and ameliorate the secondary impact problem caused by mismatch of limit parameters, the mechanical model with 8 parameters set independently for a vibration isolation system with displacement restrictors was established.The shock simulation computation results obtained with this model and the 4-order Runge-Kutta integration algorithm were compared with those of impact tests.The effects of restrictor parameters including stiffness ratio and installation gap on the system’s shock responses were analyzed.The results showed that when stiffness ratio is large enough, there is a specific gap making the system acceleration response the maximum, it is called resonance gap; the existence of resonance gap amplifies the system’s acceleration response and intensifies the system’s impact collision; but the resonance gap phenomenon can be effectively avoided by choosing a smaller installation gap and matching a reasonable stiffness ratio to effectively improve impact resistance of shipborne equipment.

Key words

displacement restrictors / Runge -Kutta / stiffness ratio / resonance gap / impact resistance

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LIU Haichao1, YAN Ming1, FENG Linhan2. Shock response of a vibration isolation system with displacement restrictors[J]. Journal of Vibration and Shock, 2019, 38(21): 172-177

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