A Study on Drum Brake Noise by Holographic Vibration Analysis

Abstract

<div class="htmlview paragraph">Holographic analysis of vibrations on squealing drum brake systems is a useful method to localize vibration sources on drum brake components. The results described in this paper are obtained by combinations of holographic as well as classical vibration measurements.</div> <div class="htmlview paragraph">This report describes experiments and illustrates how results in preventing brake squeal can be obtained, and used as a logical basis for the efficiency of this method.</div> <div class="htmlview paragraph">As a consequence easier principles for suppression of brake noise can be developed.</div> <div class="htmlview paragraph">Experiments carried out on three different types of rear brake systems show, that the main part of noise (1 to 2 kHz) is transmitted by the backing plate. Improved constructions without any tendency to squeal are demonstrated.</div> <div class="htmlview paragraph">A main result of this new testing method is that the observations and experiments carried out are of a general nature and so they are easily transferable to other brake noise problems on drum brake systems.</div>