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针对轴承腔壁面油膜厚度难测的问题,根据脉冲反射法的基本原理,建立了用于测量轴承腔内壁面油膜厚度的超声波测量系统。测量系统主要包括硬件系统和软件系统两大部分,硬件系统主要由数据采集卡、探头、延迟块和相应的电缆等组成;软件系统功能主要有测量参数的设置、测量波形的实时显示、后处理等功能。然后,用所开发的测量系统测量静态条件下八种不同厚度的油膜,并将实验结果与计算值进行对比,第八种油膜厚度下相对误差为6.9%其余七种情况油膜厚度的相对误差均在5%以下,满足工程实践要求。最后,进行油膜厚度动态测量实验,获得相同流量、不同转速下轴承腔壁面的油膜厚度,经过动态测量的信号品质分析和油膜厚度变化规律分析,该测量系统能在较高精度的要求下完成轴承腔壁面油膜厚度的测量。
Aiming at the problem that the film thickness of the bearing cavity wall is difficult to measure, an ultrasonic measuring system for measuring the film thickness of the inner wall of the bearing cavity is established according to the basic principle of pulse reflection method. The measurement system mainly includes two parts: hardware system and software system. The hardware system mainly consists of data acquisition card, probe, delay block and corresponding cables. The main functions of the software system include setting of measurement parameters, real-time display of waveform, post-processing And other functions. Then, with the developed measurement system, eight different thicknesses of oil film were measured under static conditions and the experimental results were compared with the calculated values. The relative error of the eighth film thickness was 6.9%. The relative errors of the remaining seven kinds of film thickness Below 5%, meet the engineering practice requirements. Finally, dynamic measurement of oil film thickness was carried out to obtain the thickness of the oil film on the wall of the bearing cavity under the same flow rate and different rotational speed. After analyzing the signal quality of the dynamic measurement and the change rule of the oil film thickness, the measurement system can complete the bearing with higher precision Cavity wall surface film thickness measurement.