变截面粘弹性波导吸振器阻尼耗能机理的研究

The Investigation on Energy Dissipation Principle of Viscoelastic Waveguide Absorber with Changeable Section

以粘弹性材料的分型本构关系为基础，建立了一种截面呈指数规律变化的梁类粘弹性波导吸振器动力学模型．通过对其进行力学分析，导出了粘弹性波导吸振器能量耗散量与波的频率、材料参数、结构参数等之间的关系方程．仿真结果表明，粘弹性波导吸振器有良好的减振效果，特别是对于中频和高频，效果非常理想，而且对波导吸振器的长度要求很低．

A dynamic model of viscoelastic waveguide absorber, whose section along its longitudinal axis is reduced according to an exponential function, is presented based on the differential constitutive relations of viscoelastic materials. By analyzing its dynamic properties, an energy dissipation equation concerned with parameters of wave frequencies, structures, materials and so on is deduced. The simulation results show that the viscoelastic waveguide absorber has good effect on vibration damping. Especially, when the system vibrates at the intermediate or high frequency, the effect is ideal and the length limit of the viscoelastic waveguide absorber is loosened a lot.