Noise Analysis of Air Disc Brake Systems Using Wavelet Synchro Squeezed Transform

Year 2019, Volume: 15 Issue: 4, 409 - 414, 30.12.2019

Zeynep Ertekin , Nalan Özkurt

https://doi.org/10.18466/cbayarfbe.522686

Abstract

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Recently, signal processing methods are shown to be
successful while diagnosing faults in mechanical systems, using noise or
vibration data.  In this study, two
different faulty air disc brakes; noisy and less noisy ones are investigated
using Wavelet Synchrosqueezed Transform on audio recordings. The difference
between two types are shown in scalogram and also verified by a quantitative
measure of entropy. The audio recording has been carried out by using two
identical microphones sited on the brakes via data acquisition unit at a
sampling rate of 20 kHz, 16-bit resolution and these data are analyzed in
MATLAB software. The average of the entropy values of faulty and non-faulty
brakes were found to be 0.98 and 0.65, respectively. Therefore, it has been
concluded that, the entropy could be used as a distinguishing tool to
discriminate the faults.

Keywords

Air Disc Brake, Entropy, Noise analysis, Sound Processing, Wavelet Synchro Squeezed Transform

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