Analysis and research on abnormal noise of idle oil pan of a commercial vehicle
In order to solve the problem of"whine"abnormal noise of the engine oil pan at idle speed of a diesel model in the process of product development,the cause of abnormal noise of the oil pan was analyzed through noise and vibration test and simulation analysis.The results show that the working excitation frequency of the oil pump at idle speed is coupled with the modal frequency of the oil pan,forming a"whine"sound,which radiates through the surface of the oil pan.Further experimental research shows that with the increase of oil temperature,the power and working excitation amplitude of oil pump will gradually decrease,and the abnormal sound will gradually decrease.At the same time,the experimental research shows that the oil quantity has an influence on the oil pan mode.The more oil filling in the oil pan,the lower the oil pan mode,and the vibration amplitude and abnormal sound of the oil pan surface gradually decrease.In view of the abnormal sound problem,the corresponding frequency range of the oil pan when the upper and lower limits of the engine oil filling are defined,and the frequency avoidance of the oil pump excitation frequency and the oil pan mode frequency is solved by optimizing the idle speed and improving the oil pan mode.
NETL
NSTL
万方数据
维普
