关键词: 叶片式机油泵；阶次噪音；背景噪音；抗泡剂；差值法

Abstract: The howling noise of vehicle oil pump has multiple orders and a relatively wide frequency range, get the driver's attention. In order to study the subjective and objective evaluation methods for multi-order howling and the effectiveness of control schemes, the corresponding analysis of subjective and objective evaluations is carried out for the order howling noise of vane-type mechanical oil pump at different frequencies. And an optimization scheme is proposed based on the generation mechanism of the order howling noise of mechanical oil pump. Ultimately, it is concluded that the difference method between order noise and background noise at different frequencies can accurately evaluate the order noise level of mechanical oil pump. The main reason for the order noise of oil pump in vehicle is the insufficient anti-foaming performance of the oil pump's oil. By adding an anti-foaming agent with silicon to optimize the oil pump's oil, the noise problem of mechanical oil pumps is optimized. Subjective evaluation of the improved oil pump noise, in combination with objective difference data, further validates the rationality of the difference method between order noise and background noise at different frequencies.

Key words: vane-type oil pump; order noise; background noise; anti-foaming agent; difference method