Dynamic characteristics of skyhook semi-active inerter-based vibration isolator

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (15) : 65-72.

TANG Feng1, WANG Yong1,2, DING Hu1, CHEN Liqun1

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Abstract

The 3-element parallel passive inerter-based vibration isolator based on “inerter-spring-damping” can further broaden vibration isolation frequency band of traditional linear isolator, but its high-frequency vibration isolation performance deteriorates significantly. Here, a semi-active inerter-based vibration isolator based on the skyhook-inertance control was proposed to improve its high-frequency vibration isolation performance. The skyhook-inertance control strategy used the absolute-relative acceleration switch control to switch the inertance of the semi-active inerter between its maximum and minimum values, and approximately simulate the mechanical property of the ideal skyhook inerter. Dynamic characteristics of the semi-active inerter-based vibration isolator under base harmonic displacement excitation were studied. The average method was used to solve the approximate analytical solution to the system, and it was verified using the numerical solution. The results showed that compared with the passive inerter-based vibration isolator, the semi-active inerter-based vibration isolator has lower absolute displacement peak value, lower transmissibility peak value and wider vibration isolation frequency band; the latter’s high frequency absolute displacement transmissibility drops obviously, it has a significant advantage over the former.

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vibration isolator / semi-active inerter / skyhook-inertance control / dynamic characteristics

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TANG Feng, WANG Yong, DING Hu, CHEN Liqun. Dynamic characteristics of skyhook semi-active inerter-based vibration isolator[J]. Journal of Vibration and Shock, 2021, 40(15): 65-72

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