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

摘要： 车辆机油泵啸叫噪音阶次较多，频率较宽，倍受驾驶员关注。为研究多阶次啸叫主客 观评价方法和控制方案的有效性，针对叶片式机械油泵不同频率下的阶次啸叫噪音进行了主 客观评价对应分析，并结合机械油泵阶次啸叫噪音的产生机理提出了优化方案。最终得出不 同频率下阶次噪音与背景噪音差值法能较准确评价机械油泵阶次噪音水平；导致车内机油泵 阶次噪音的主要原因是机油泵油品的抗泡性能不足，通过添加含硅抗泡剂优化机油泵油品， 改善了机械油泵噪音问题。通过主观评价改善后的机油泵噪音，并与客观差值数据对比，进 一步论证了不同频率下机油泵阶次噪音与背景阶次噪音差值法的合理性。

关键词: 叶片式机油泵；阶次噪音；背景噪音；抗泡剂；差值法