Leung, Andrew Yee TakAndrew Yee TakLeungLi, W.Gu, F.Ball, A. D.2022-06-142022-06-142000https://repository.sfu.edu.hk/handle/sfu/3407The continuous wavelet transform (CWT) is applied to analyse the acoustic signals obtained from a diesel engine. First a brief review in the analysis of engine acoustic signals is given. To obtain condition-indicating information, the characteristics and implementation of the CWT are addressed. Its capability of time-frequency localisation is demonstrated using a numerical example. The CWT representation of the acoustic signals exhibits a clear picture of the combustion process. The feature is then quantified using a local energy index. The results show that the method is able to discriminate a number of abnormal injection faults.enconference paper