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首页> 外文会议>American Society of Mechanical Engineers(ASME)/Society of Tribologists and Lubrication Engineers(STLE) International Joint Tribology Conference 2004(IJTC 2004) vol.1 pt.A; 20041024-27; Long Beach,CA(US) >Evaluation of an Ultrasonic Oil Film Measurement Technique for PTFE Faced Thrust Pad Bearings
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Evaluation of an Ultrasonic Oil Film Measurement Technique for PTFE Faced Thrust Pad Bearings

机译：PTFE推力瓦轴承的超声波油膜测量技术评估

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摘要

There is a growing trend in the replacement of the babbit facing in thrust pad bearings with a composite PTFE surface layer. The PTFE faced bearings have been shown to allow a greater specific pressure, reduce thermal crowning, and in some cases negate the need for an oil-lift (jacking) system. These designs of bearing require new methods for the measurement of oil film thickness both to assist in their development and for plant condition monitoring. In this work, an ultrasonic method of oil film measurement is evaluated for this purpose. An ultrasonic transducer is mounted on the back face of the thrust pad. Pulses are generated and transmitted through the pad material, bonding interlayer, and PTFE surface layer. The proportion of the wave that reflects back from the oil film layer is determined. This is then related to the oil film thickness using a series of calibration experiments and a spring stiffness model. In practice the reflected signal is difficult to distinguish, in the time domain, from other internal reflections from the pad. Signals are compared with reflections when no oil film is present and processing is carried out in the frequency domain. Experiments have been performed on a full size PTFE-faced thrust pad destined for a hydroelectric power station turbine. The instrumented pad was installed in a test facility and subjected to a range of loading conditions both with and without oil lift. Whilst there were some problems with the robustness of the experimental procedure, oil films were successfully measured and used to study the effect of the oil lift system on film formation.
机译：用复合PTFE表面层代替推力轴承中的巴氏合金面的趋势正在增长。 PTFE轴承已显示出可以提供更大的比压力，减少热凸度，并且在某些情况下不需要油提升（举升）系统。这些轴承设计需要新的方法来测量油膜厚度，以帮助其开发和工厂状况监控。在这项工作中，为此目的评估了超声波油膜测量方法。超声换能器安装在止推垫的背面。产生脉冲并通过垫材料，粘合夹层和PTFE表面层传输脉冲。确定从油膜层反射回来的波的比例。然后使用一系列校准实验和弹簧刚度模型将其与油膜厚度相关。实际上，所反射的信号在时域上很难与焊盘的其他内部反射区分开。当不存在油膜并且在频域中进行处理时，将信号与反射进行比较。已经对用于水力发电站涡轮的全尺寸PTFE面止推垫进行了实验。仪表垫安装在测试设备中，并在有和无油提升的情况下经受一系列负载条件。尽管实验过程的鲁棒性存在一些问题，但成功测量了油膜并用于研究油提升系统对成膜的影响。

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