A vibration and damping analysis of circular plates with constrained damping layer treatment

This technique permits the extraction of acoustic intermodal coupling information from numerically modeled, baffled planar structures. The technique generates results in close agreement to a parallel analytical development. Below the coincidence wave number ratio, the intermodal coupling effects cannot be neglected with respecty to the total radiated power.

Effect of modal interaction on sound radiation from vibrating structures

Vibration and damping analysis of cylindrical shells with a constrained damping layer

Partial coverage of rectangular plates by unconstrained layer damping treatments

A new 1-3 viscoelastic composite material (VECM) layer is designed in order to achieve improved passive damping characteristics of the unconstrained (UCLD)/constrained (PCLD) layer damping treatment of structural vibration. The present 1-3 VECM layer is used instead of traditional monolithic viscoelastic material (VEM) layer within the UCLD/PCLD treatment. The corresponding change in damping is studied through the static as well as dynamic finite element (FE) analyses of a substrate beam integrated with the UCLD/PCLD treatment. The static analysis reveals augmentations of damping in the use of 1-3 VECM layer. The dynamic analysis quantifies improvement in the passive unconstrained/constrained layer damping through the present design.

S. Narayanan

Papers

Response of plates with unconstrained layer damping treatment to random acoustic excitation, part I: Damping and frequency evaluations

Response of plates with unconstrained layer damping treatment to random acoustic excitation, part II: Response evaluation