Characterization of acoustic black hole effect using a one-dimensional fully-coupled and wavelet-decomposed semi-analytical model

Passive constrained viscoelastic layers to improve the efficiency of truncated acoustic black holes in beams

Enhanced Acoustic Black Hole effect in beams with a modified thickness profile and extended platform

An improved acoustical damping wall (ceiling or floor) or door material comprises a laminar structure having as an integral part thereof one or more layers of viscoelastic material which also functions as a glue and one or more constraining layers, such as metal, cellulose, wood, or petroleum-based products such as plastic, vinyl, plastic or rubber. In one embodiment, standard wallboard, typically gypsum, comprises the external surfaces of the laminar structure; and one or more constraining layers are fabricated between the gypsum exterior. The resulting structure improves the attenuation of sound transmitted through the structure.

Accoustical sound proofing material and methods for manufacturing same

A 2D Daubechies wavelet model on the vibration of rectangular plates containing strip indentations with a parabolic thickness profile

This paper presents a study on vibration damping by means of partial viscoelastic coating applied to the surface of vibrating panels. An optimization procedure seeking the location as well as the shape of coverage giving the best damping performance for a given weight of material is established. Emphasis is also put on the temperature and frequency dependent characteristics of the viscoelastic material. The results show the effects of the operating temperature and the great potential of using optimized partial coverage, either to reduce the weight while maintaining the same damping level or to increase the performance with the same amount of material.

R. Lapointe

Papers

Vibration Attenuation of Panel Structures by Optimally Shaped Viscoelastic Coating with Added Weight Considerations