Study on the Fractal Feature of Cylinder-head Vibration Signal for Diesel Engines
Lu Jin-Ming · Noise and Vibration Control · 2013
Wavelet transform and fractal theory was combined and applied to the analysis of the cylinder-head vibration signal of diesel engines and the extraction of the fault features according to the nonlinearity of the vibration signal.The fault of abnormal valve clearance of the diesel engine was diagnosed.The dimension of wavelet-packet frequency-band box,the maximum wavelet transform module and the multi-fractal spectrum of the vibration signal were calculated.The results show that the fractal dimension and the multi-fractal spectrum can be employed as a system measure and a fault characteristic parameter so as to make the diagnosis simple,practical and feasible.