Vibration Characteristic Analysis of a Cavity Treated with Passive Constrained Layer Damping

A semi-analytical method was proposed to analyze the dynamics characteristics of a cavity treated with passive constrained layer damping (PCLD). Based on the laminated theory，the dynamics equations of a PCLD beamwas derivedfirstly. Then the transfer matrix between beams was developed according to the displacement continuity conditions and equilibrium equations of the junction. Combing the state equations of the beams, the transfer matrix between beams, and the boundary conditions, the dynamic model of a PCLD cavity was established in this paper. The comparisons with the results of FEM and document have certificated the correction of the present model.The numerical calculations show that the PCLD treatment can damp the vibration well, especially in the higher frequency, and the damping effect increases with the increasing of the thickness of the viscoelastic, but it may be decrease when the thickness of the constrained increases.

Passive constrained layer damping; cavity; dynamic model; vibration characteristic

Lu Jing, Wang Yuxiang, Yuan Liyun. Vibration Characteristic Analysis of a Cavity Treated with Passive Constrained Layer Damping. 2019 International Conference on Advanced Manufacturing, Computation and Optimization (AMCO 2019), 2019, Vol.1: 98-105. DOI: https://doi.org/10.35532/JCES.V1.017.