Study on Characteristic Parameters of Engine Vibration Signal Based on Multi-Fractal
Guobin Li · Transactions of Csice · 2008
A method to characterize engine vibration signal characteristics was proposed using multi-fractal spectrum parameters.The vibration signals picked up from the engine cylinder body were analyzed by using the multi-fractal theory,and the multi-fractal parameters of vibration signals under different operating conditions were calculated.The relationship between the multi-fractal parameters and the operating condition was discussed.The study shows that the multi-fractal spectrum parameters can be used to quantitatively describe the characteristics of the vibration signals.The multi-fractal spectrum parameters of the signals will vary with the variation of engine state.When the vibration intensity of cylinder body increases,the multi-fractal spectrum parameters will increase and can reflect the real operating conditions of the engine.Therefore,the multi-fractal spectrum parameters can be used to the state monitoring and fault diagnosing.