Oil film thickness measurement system of crankshaft based on ultrasonic reflection signal

被引：0
|
作者：
Zhang Y. [1 ]
Liang G. [1 ]
Cao C. [2 ]
Tang Z. [3 ]
机构：
[1] Department of Mechanical Engineering, Tsinghua University, Beijing
[2] School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu
[3] Neijiang Jinhong Crankshaft Co., Ltd., Neijiang
来源：
Qinghua Daxue Xuebao/Journal of Tsinghua University | 2022年 / 62卷 / 09期
关键词：
acoustic reflection signal; linear model; oil film thickness of crankshaft; ultrasonic measurement;
D O I：
10.16511/j.cnki.qhdxxb.2022.21.019
中图分类号：
学科分类号：
摘要：
The performance of an internal combustion engine is related to the lubrication state of the crankshaft. In this paper, a thickness measurement system is developed using an ultrasonic reflection signal to monitor the change of oil film thickness in real time. Based on acoustic theory. the relationship between oil film thickness and acoustic reflection coefficient in multilayer media is derived, and the application methods of the spring, resonance, and phase shift models are given. For the crankshaft. the oil film thickness ranges from 0 to 50 μm, an ultrasonic double crystal straight probe with a center frequency of 1.056 MHz is used to generate and receive the ultrasonic signal, and a long axis with four annular grooves with different depths is processed to obtain the functional relationship between the oil film thickness and the spectral peak of the acoustic reflection signal. To calculate the oil film thickness, the fitted linear model is embedded into Lab VIEW software. The test shows that the relative error of the measurement system is less than 10%, and the oil film thickness can be measured well. © 2022 Press of Tsinghua University. All rights reserved.
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页码：1484 / 1491
页数：7
相关论文
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