关键词: 振动与波, 约束阻尼板, 模态实验, 模态阻尼, 有限元

Abstract:

Constrained damping structure can suppress vibration of the structure in a wide frequency band, and has been widely used in the fields of mechanical and traffic. In this paper, the modal experiment of a constrained damping plate is carried out by hammer excitation of the multiple input multiple output (MIMO). The natural frequencies, mode shapes and modal damping ratio are obtained by parameter identification. The reliability of the modal experiment results is verified by comparing the modal test results with the finite element results. On this basis, damping characteristics of the cantilever plate structure with viscoelastic damping layer are studied and the effects of material parameters and structural parameters on modal damping are discussed, which provide a reference for the vibration and noise reduction and optimization design of the structure.