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首页> 外文会议>SAE Noise and Vibration Conference and Exhibition >Cavitation Detection in Automotive Torque Converters Using Nearfield Acoustical Measurements
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Cavitation Detection in Automotive Torque Converters Using Nearfield Acoustical Measurements

机译：使用近场声学测量的汽车扭矩转换器中的空化检测

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As automotive torque converters decrease in both diameter and axial length, the effects of cavitation in the torque converter becomes increasingly important on noise, efficiency, and performance goals. Cavitation is the formation and collapse of vapor bubbles in a working fluid when local static pressure falls below the vapor pressure of the working fluid. A technique to detect cavitation in automotive torque converters using nearfield acoustical measurements is presented. The technique concentrates on high frequency noise that is associated with the collapse of vapor bubbles. The nearfield acoustical technique is compared to two other techniques using static pressure measurements inside the torque converter; one on the torque converter stator blades and the other on the torque converter pump blades. A microwave telemetry transmitter was used to obtain data from inside the torque converter in both previous investigations. The nearfield acoustical technique is demonstrated to be valid on a torque converter dynamometer test stand and in the bell housing of an operating vehicle. Using the nearfield acoustical technique, the effects of temperature and charge pressure on cavitation are shown. These effects are shown to agree with typical cavitation behaviors. The results for different performance torque converters are compared in the vehicle and on the dynamometer test stand. The results from in-vehicle tests show the same trends as test stand results. The nearfield acoustical technique provides a simple, relatively inexpensive procedure that can be utilized on a test stand as well as in the vehicle to determine the onset of cavitation in automotive torque converters.
机译：由于汽车扭矩转换器两者直径和轴向长度减小，空化在变矩器中的影响对于噪声，效率和性能目标变得越来越重要。当局部静压低于工作流体的蒸汽压力时，空化是工作流体中的蒸汽气泡的形成和塌陷。提出了一种使用近场声学测量来检测汽车扭矩转换器中空化的技术。该技术集中在与蒸汽气泡塌陷相关的高频噪声上。将近场声学技术与在变矩器内的静压测量中的另外两种技术进行比较;一个在变矩器定子刀片上，另一个在变矩器泵叶片上。微波遥测变送器用于在先前的研究中从扭矩转换器内部获得数据。近场声学技术被证明是在变矩器测力计测试台和操作车辆的钟形壳体上有效。使用近场声学技术，示出了温度和电荷压力对空化的影响。这些效果被认为与典型的空化行为一致。不同性能扭矩转换器的结果在车辆和测功机测试台上进行了比较。车载试验结果显示与测试支架结果相同的趋势。近场声学技术提供了一种简单，相对便宜的程序，可以在测试台以及车辆中使用，以确定汽车扭矩转换器中的空化发作。

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