Author(s)

Imed El Fray, Jerzy Slonecki & Miroslawa El Fray

Abstract

Viscoelastic material such as rubbers and polyurethanes are widely used for acoustic attenuation and vibration insulation. Synthesised termoplastic copolyester elastomers are characterized by high values of the loss factor (TJD= 0.13 to 0.36) over a broad frequency range (from 35 to 4500 Hz). The energy adsorbing abilities were measured by dynamic thermomechanical analysis and vibration transfer function method. 1 Introduction The vibration control problems are usually identifiable as directly associated with some abnormal dynamic behavior of the part affected, and not with some far distant point which may be the source in the case of some other noice problems. The one phenomenon which dominates the dynamic behaviour of structures and machines is resonance.

Keywords