主动约束层阻尼结构的一种新模型

NEW MODEL FOR STRUCTURES TREATED WITH ACTIVE CONSTRAINED LAYER DAMPING

提出一种主动约束层阻尼结构的新力学模型。该模型假定阻尼层既横向剪切变形又横向拉压变形,主动约束层和基层存在不同的横向位移。使用有限元法建立主动约束层阻尼梁的动力学方程,并针对典型算例进行数值计算。与传统模型比较发现:粘弹性层的横向拉压变形不但会影响系统的动态特性,而且会降低压电层的主动控制作用。研究表明,粘弹性层横向压缩变形不应忽略。

In present study, a new model for ACLD structures is introduced. The new model considers both the thickness deformation and the shear deformation of the damping layer, and permits to assume different transverse displacements in the active constrained layer and the host structure. The finite element method (FEM) is used to analyze the coupled vibration of beams fully treated with ACLD. With a typical example, the results of the new model are compared with those of the traditional model. It is found that the thickness deformation in the damping layer not only changes the dynamic characteristics of the control system, but also reduces the control effort of the active constrained layer. It seems that the thickness deformation should not be neglected.