基于弹性关节的二维宽频隔振结构的设计及优化

为了得到具有隔振功能的新型材料,本文对带有弹性关节的新型二维隔振结构的形状、尺寸及材料的选取进行了研究.探究了负泊松比结构实现宽频的带隙功能的作用,分析其在低频处的隔振性能.首先,文章建立了基于弹性关节单元的有限元模型,并以弹性关节的角度作为设计变量,确定角度与单元模型前三阶模态频率之间的关系,获得了最优的结构参数及单元构型.其次,对单元结构进行了动力学分析,给出了结构的动力学响应曲线,得到了隔振频带与结构参数的关系,并且确定了最优角度下的带隙深度和宽度.最后,建立了二维隔振结构有限元模型,对此二维结构进行了动力学分析,得到了在不同方向激励下的动力学响应曲线.结果表明,该二维隔振结构在低频处具有宽而深的频率带隙,实现了将弹性关节与二维隔振结构相结合的低频宽频隔振,为隔振领域的结构和材料设计提供了新思路.

Design and optimization of broadband vibration isolation structure with elastic joints

To fulfill broadband low-frequency vibration isolation,a new two-dimensional negative Poisson′s ratio structure with elastic joints was proposed.Firstly,the finite element model of the unit cell was established,and the angle of the elastic joint was taken as a design variable.The effect of the angle on the first three natural frequencies was analysed,and the optimal angle and element configuration were obtained.Secondly,the dynamic analysis of the unit cell was carried out to reveal the relationship between the isolation frequency band and the angle.Finally,the dynamic analysis of the vibration isolation structure was carried out,and the dynamic responses under different excitation directions were obtained.The results showed that this vibration isolation structure achieves a wide and deep band gap at low frequencies,and realizes low-frequency and wide-frequency vibration isolation,which provides a new idea for the structure and material design for vibration isolation.