Method and system for measuring ultrasonic proportionality coefficient of thickness of lubricating film of sliding bearing

By calculating the proportional coefficients of the reflected echo signal of the sliding bearing lubricant film and the reflected echo signal of the substrate-linear interface, a comprehensive response coefficient and proportional coefficient are constructed, and the amplitude spectrum and phase spectrum of the lubricant film reflection coefficient are separated, which solves the measurement error problem caused by the change of the sensor binding force and realizes high-precision measurement of the lubricant film thickness.

CN120368891APending Publication Date: 2025-07-25XI AN JIAOTONG UNIV
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Patent Information

Application Number
CN202510605340.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-12
Publication Date
2025-07-25

AI Technical Summary

Technical Problem

In the prior art, the measurement method for measuring the thickness of the sliding bearing lubricant film has a problem of poor robustness, especially due to the measurement error caused by the change in the bonding force between the sensor and the substrate, which affects the accuracy of the lubricant film thickness.

Method used

By calculating the proportional coefficients of the reflective echo signal of the bearing shell at the air medium and the reflected echo signal of the matrix-liner interface, a comprehensive response coefficient and proportional coefficient are constructed, the amplitude spectrum and phase spectrum of the lubricating film reflection coefficient are separated, and the thickness of the lubricating film is calculated using the resonance model method or the composite model method to reduce interference from external factors.

Benefits of technology

It improves the robustness and accuracy of measuring the thickness of the sliding bearing lubricant film, and can monitor the thickness of the lubricant film for a long time and reliably, and is suitable for high-precision detection in industrial sites.

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Abstract

The invention discloses a method and system for measuring the ultrasonic proportionality coefficient of the thickness of a lubricating film of a sliding bearing, and the method comprises the steps: firstly, obtaining the comprehensive response coefficient of sound waves in a transition combination layer of a substrate and a lining through calculating the proportionality coefficient of a reflection echo signal of a bearing bush in an air medium and a reflection echo signal of a substrate-lining interface; characterizing the propagation rule of sound waves in a base body and lining combination layer; secondly, a proportionality coefficient is constructed based on a lubricating film reflection echo signal and a matrix-lining interface reflection echo signal, a lubricating film reflection coefficient is calculated in combination with a comprehensive response coefficient of sound waves in a matrix-lining transition combination layer, and finally the thickness of the lubricating film is solved through a resonance model method or a composite model method. According to the invention, the influence of the change of the binding force between the sensor and the substrate and the unstable voltage of ultrasonic pulse emission equipment on the reference signal can be avoided, the robustness is high, and the long-term reliable monitoring of the thickness of the lubricating film of the sliding bearing is facilitated.
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