This paper introduces a method to quickly and accurately identify the sound quality of automatic transmission in a vehicle by testing the objective vibration parameters on automatic transmission EOL (end of line) test bench. In this study, 50 automatic transmissions serve as the research object, and the vibration parameters of each gear of the transmission are measured on the EOL bench. Then, the transmission is mounted on a vehicle, the vibration parameters and acoustic parameters of corresponding working conditions are measured, and the subjective evaluation of the noise quality of the vehicle is carried out by using a grade scoring method. After this data is collected, the specific vibration parameters and acoustic parameters that are the dominant factors of sound quality are determined by correlation analysis. Based on the multiple linear regression method, the following mathematical models are formulated: the vibration parameters and the subjective evaluation of a vehicle, and the acoustic parameters and the subjective evaluation of a vehicle. Among these models, the mathematical models of the vibration parameters and the subjective evaluation of a vehicle were verified to be more accurate. The consistency between the vibration value in a vehicle and the vibration value on EOL test bench is analyzed and the EOL vibration value is determined to be the most objective evaluation of the data. After batch testing of 100 sets, the effectiveness of this model is within 95%. Finally, the value of critical amplitude of the condition of each gear of transmission is analyzed to form the judgment standard of transmission EOL vibration to ensure better sound quality for the vehicle.

中文翻译：

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自动变速器下线测试声音质量与振动的相关性

介绍了一种通过在自动变速器EOL（end of line）试验台上测试客观振动参数来快速、准确地鉴定汽车自动变速器音质的方法。本研究以50台自动变速器为研究对象，在EOL台架上测量了变速器各档位的振动参数。然后将变速器安装在车辆上，测量相应工况的振动参数和声学参数，采用等级评分法对车辆噪声质量进行主观评价。收集这些数据后，通过相关分析确定作为音质主导因素的具体振动参数和声学参数。基于多元线性回归方法，建立了车辆振动参数与主观评价、车辆声学参数与主观评价数学模型。其中，振动参数和车辆主观评价的数学模型经验证较为准确。分析了车内振动值与EOL试验台振动值的一致性，确定EOL振动值是对数据最客观的评价。经过100套批量测试，该模型的有效性在95%以内。最后，分析变速器各档位工况的临界振幅值，形成变速器EOL振动的判断标准，以保证车辆更好的音质。