Abstract
Keywords:
wavelet analysis, fault detection, engine diagnostics, valvetrain, multibody dynamics
Abstract:
We propose a time-frequency method based on wavelet transform to detect, locate, and diagnose common faults in valve train mechanism and combustion process. For this purpose, a flexible multibody dynamic model has been developed using ADAMS. The model includes the valve train system, cylinder head, and gas pressure effect. The vibration response of the cylinder head surface under simulated excessive valve clearance is investigated. The spectral properties of vibrations caused by highly transient dynamics are analyzed using continuous wavelet transform. Wavelet decomposition is performed to identify and correlate dynamical response of the system with corresponding sources of excitation. Fault detection procedure is presented and discussed.