基于非对称复合材料层合板的准零刚度隔振系统
郭怀攀，李昊，陈卫东，周徐斌
摘要:提出了基于正交铺设复合材料层合板的准零刚度隔振系统。采用理论分析与有限元方法研究了有残余热应力的正交铺设复合材料层合板的双稳定特性及负刚度特性。发现层合板具有负刚度特性的变形区间随层板厚度增加而逐渐变窄。正交铺设复合材料层合板在其厚度略厚于失去双稳定特性临界厚度时具有准零刚度特性。利用准零刚度正交铺设复合材料层合板构造了简单的隔振系统，研究其在中心加速度激励下的加速度传递幅值，并与线性隔振系统的隔振效果进行比较。结果显示该准零刚度隔振系统固有频率低于线性隔振系统固有频率，加速度传递峰值小于线性隔振系统，有效隔振频率范围宽于线性隔振系统。
关键词：双稳定, 负刚度, 准零刚度, 非线性, 振动隔离
A quasi-zero-stiffness vibration isolation system based on unsymmetric composite laminate
Huaipan Guo, LI Hao, Weidong Chen, Xubin Zhou
Abstract：A novel quasi-zero-stiffness (QZS) vibration isolation system based on cross-ply composite laminates was proposed in this paper.A theoretical model and a finite element model (FEM) were established to explore the bistability and negative stiffness characteristics of cross-ply composite laminates with residual thermal stress.The deformation range corresponding to the negative stiffness was narrowed as the thickness of the laminate increases.As long as the laminate thickness is slightly thicker than a critical thickness, the cross-ply laminate loses bistability and then shows the characteristics of quasi-zero-stiffness.The proposed vibration isolator takes advantage of the quasi-zero-stiffness of cross-ply laminate.The characteristics of the proposed isolator was evaluated theoretically and numerically, and compared with the corresponding linear vibration isolation system.The proposed QZS vibration isolator exhibits lower nature frequency than the linear isolator.Moreover, significant lower acceleration transmissibility and wider frequency range of vibration isolation were observed for the QZS vibration isolator.
Keyword：bistable, negative stiffness, quasi-zero-stiffness, nonlinear, vibration isolation
