两端固支屈曲梁准零刚度隔振器的微振动隔振性能分析

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (15) : 124-129.

论文

王云峰，李博，王利桐

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Micro-vibration isolation performance of a clamped-clamped buckled beam quasi-zero-stiffness isolator

WANG Yunfeng,LI Bo,WANG Litong

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摘要

航天器微振动具有幅值低、频带宽的特点，传统的被动隔振器难以对其有效隔离，两端固支屈曲梁准零刚度隔振器具有高静刚度低动刚度特性，且避免了铰接引入的间隙和摩擦，可适用于微振动隔振；本文对该隔振系统的动力学特性和隔振特性进行了分析；首先，推导了屈曲梁正负刚度并联系统的零刚度条件，其次，利用谐波平衡法得到系统阻尼、扰动幅值对系统隔振性能的影响；最后，通过SIMULINK仿真对隔振系统的性能进行了验证，结果表明，该隔振系统低频隔振性能优于线性系统，可有效隔离微振动。

Abstract

Micro-vibration in spacecraft is difficult to isolate with traditional passive isolators due to its low amplitude and wide frequency band features. A clamped-clamped buckled beam quasi-zero-stiffness (QZS) isolator has features of high static stiffness and low dynamic stiffness, and it avoids gap and friction in revolute joints, so it is suitable for micro-vibration isolation. Here, its dynamic characteristics and vibration-isolation performance were studied. Firstly, the zero-stiffness condition for the buckled beam with a positive stiffness and negative one parallel connected was derived. Secondly, effects of system damp and disturbance amplitude on the system vibration-isolation performance were investigated using the harmonic balance (HB) method. Finally, the simulation with the software SIMULINK was performed to validate the system’s micro-vibration isolation performance. The results indicated that a clamped-clamped buckled beam quasi-zero-stiffness (QZS) isolator's performance is much better than a linear system’s; the former can effectively isolate micro-vibration.

关键词

固支屈曲梁 / 准零刚度 / 微振动 / 隔振

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王云峰，李博，王利桐. 两端固支屈曲梁准零刚度隔振器的微振动隔振性能分析[J]. 振动与冲击, 2018, 37(15): 124-129

WANG Yunfeng,LI Bo,WANG Litong. Micro-vibration isolation performance of a clamped-clamped buckled beam quasi-zero-stiffness isolator[J]. Journal of Vibration and Shock, 2018, 37(15): 124-129

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