Research on testing method of abnormal sound from oil pump gear
Aiming at the abnormal sound from the oil pump gear of small internal combustion engine, the frequency spectrum analysis method and envelope analysis method are used to analyze the abnormal sound of right shell engine; then the acoustic interaction filtering technique is used for the frequency analysis of abnormal sound that could not be identified by the frequency spectrum analysis method and envelope analysis method. The testing results show that the abnormal sound frequencies of oil pump gear do not appear in the frequency spectrum of gear mesh, but can find in the multiple high frequency bands. And, with the rotaing speed going up, the frequency of abnormal sound keeps constant and the energy increases. The sources of superficial radiation sound and the parts of generating abnormal noise are determined by the sound intensity method, and the above-mentioned testing results can be verified. The research indi-cates that the abnormal sound from the oil pump gear can be correctly recognized by the combination of methods.
the abnormal noise of gearfrequency spectrum analysisenvelope analysisacoustic interaction filtersound intensity method
NETL
NSTL
万方数据
维普
