A method to determine acoustic properties of solids and its application to measuring oil film thickness in bearing shells of unknown composition
A method to determine acoustic properties of solids and its application to measuring oil film thickness in bearing shells of unknown composition
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DOI：
10.1016/j.measurement.2022.111176
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发表时间：
2022-04
期刊：
影响因子：
5.6
通讯作者：
S. Beamish;T. Reddyhoff;A. Hunter;R. Dwyer-Joyce
中科院分区：
文献类型：
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作者：
S. Beamish;T. Reddyhoff;A. Hunter;R. Dwyer-Joyce
声阻抗是一个重要的属性，用于解释测试中的声反射测量，以确定油膜厚度，一个决定润滑部件的效率和磨损率的关键参数。介绍了一种基于弹簧模型的固体声阻抗测量新方法。这种方法相对于现有技术的优势在于，它可以应用于薄的多层材料，其中单个反射无法区分，这在许多摩擦学系统中是常见的，例如轴承、活塞环和活塞衬套。该方法是实验证明了一系列的材料。结果比较以及独立的声速和密度计算值。该方法已应用于轴承试验台，以确定薄壁轴承的声阻抗。这项研究表明，该技术是能够在动态系统中的测量和传统的方法计算声阻抗是不可行的。
Acoustic impedance is an important property used to interpret acoustic reflection measurements in tests to determine oil film thickness, a critical parameter dictating efficiency and wear rates of lubricated components. A new method to measure acoustic impedance of solid media, based on the well-established spring model, is described. The advantage of this method over existing techniques is that it can be applied to thin, multi-layered materials where individual reflections cannot be distinguished, common in many tribological systems such as bearings, piston rings and piston liners. The method is demonstrated experimentally for a range of materials. Results compare well with values calculated independently from acoustic velocity and density. The method has been applied to a bearing test rig to determine acoustic impedance of a thin-walled bearing. This study demonstrates that the technique is capable of measurements in dynamic systems and where traditional methods of calculating acoustic impedance are not feasible.