Method and system for measuring lubrication film thickness of sliding nearing based on ultrasonic proportional coefficient

A method for measuring a lubrication film thickness of a sliding bearing based on an ultrasonic proportional coefficient, the sliding bearing comprising a runner plate, a liner, a lubrication film and a substrate, and the method comprising:

• calculating a first proportional coefficient, wherein the first proportional coefficient is a proportional coefficient between an echo signal reflected from a liner-air interface and an echo signal reflected from a substrate-liner interface;
• and based on the first proportional coefficient, obtaining a comprehensive response coefficient of an acoustic wave in a transition bonding layer between the substrate and the liner;
• based on an echo signal reflected from the lubrication film and the echo signal reflected from the substrate-liner interface, constructing a second proportional coefficient;
• based on the second proportional coefficient and the comprehensive response coefficient, obtaining a reflection coefficient of the lubrication film;
• and dividing the reflection coefficient of the lubrication film into an amplitude spectrum of the reflection coefficient of the lubrication film and a phase spectrum of the reflection coefficient of the lubrication film;
• and
• based on the amplitude spectrum and the phase spectrum, calculating a thickness of the lubrication film.