Method for testing dynamic characteristics of lubricating film of sliding bearing

Abstract

The invention discloses a method for testing the dynamic characteristics of a lubricating film of a sliding bearing. The method comprises the following steps of: (1) assembling a test platform and a signal acquisition system, adjusting the rotating speed of a main shaft and the temperature and the flow rate of a lubricant, supplying a lubricating medium and starting a drive motor and a signal acquisition instrument; (2) applying excitation force on the main shaft by an electromagnet loading device of the invention, measuring the excitation force by a pressure sensor, measuring the vibration response of the main shaft in horizontal and vertical directions by electric vortex sensors and acquiring and storing signals; (3) changing the rotating speed of the main shaft, keeping the temperatureof the lubricant unchanged, and repeating the steps; (4) changing the temperature of the lubricant, and repeating the steps; (5) carrying out time-frequency domain analysis processing on the acquiredsignals and recognizing the dynamic characteristic parameters of the lubricating film by using an equation of solving frequency domain response by a least square method of solid and virtual frequencycoupling; and (6) fitting and analyzing the eight dynamic characteristics parameters of the lubricating film at different rotating speeds and different lubricating temperatures, namely obtaining the three-dimensional dynamic characteristics of the lubricating film of the sliding bearing at varied speeds and varied temperatures.

Description

Technical field: [0001] The invention belongs to the field of machinery, and relates to a method for testing the dynamic characteristics of a sliding bearing lubricating film, in particular to an electromagnetic loading excitation device, a method for testing the dynamic characteristics of a sliding bearing lubricating film based on a real-imaginary frequency coupling least squares algorithm . Background technique: [0002] The dynamic characteristics of the sliding bearing lubricant film is a very important feature of the bearing, which directly affects the performance, life, safety and reliability of the sliding bearing and the state of mechanical work. With the expansion of the application scope and occasions of sliding bearings, as well as the diversity and complexity of working conditions, use environments, and applied forces, the traditional method of testing the dynamic characteristics of the lubrication film can no longer meet the accuracy and extensiveness of the te...

AI Technical Summary

Problems solved by technology

This method needs to solve an 8-dimensional or 12-dimensional matrix equation to obtain the identification result of a single excitation, but multiple measurements will easily lead to complex response equations, the number of frequency items is too high, the amount of calculation is large, and the phase error of the instrument is difficult. Elimination, resulting in large errors in parameter identification results;

[0005] At present, when solving the eight dynamic characteristics of the lubrication film, it is usually only tested at a single working temperature, ignoring the influence of the temperature of the lubrication film on its dynamic characteristics, and the two-dimensional dynamic characteristics at this temperature are obtained, and the test results have limitations.

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