A method for predicting frictional starting noise of an engineering plastic under grease lubrication

By combining low-speed start-up and continuous step acceleration tests with the measurement of transient friction coefficient and Stribek curve using a friction and wear testing machine, the accuracy and cost issues of predicting friction noise in engineering plastics in existing technologies are solved, and a standardized noise prediction method is provided.

CN122448670APending Publication Date: 2026-07-24ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV
Filing Date
2026-06-29
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies are insufficient for the rapid, low-cost, and accurate prediction of friction noise in engineering plastic friction pairs during startup or extremely low-speed operation in the industrial sector, and conventional methods are prone to omissions or misjudgments.

Method used

A dual-criteria testing method of low-speed start-up and continuous step acceleration is adopted. The transient friction coefficient and Stribek curve are measured by a friction and wear testing machine. The friction noise risk is predicted by combining the difference between dynamic and static friction coefficients and the friction coefficient-relative velocity slope.

Benefits of technology

It enables accurate identification of noise from engineering plastic friction pairs, avoids the failure of single-mechanism diagnosis and dependence on complex equipment, and provides a standardized and practical noise prediction tool.

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Abstract

The application discloses a kind of engineering plastics friction start noise prediction methods under grease lubrication.First, the pin disc sample of the engineering plastics friction pair to be measured is prepared, and the grease to be measured is applied at the contact interface of the pin disc sample;Then, the pin disc sample to which the grease to be measured is applied is tested on a friction and wear testing machine to obtain the transient friction coefficient time curve of the start-up stage;And the pin disc sample to which the grease to be measured is applied is tested on a friction and wear testing machine to obtain the Stribeck curve;Finally, according to the transient friction coefficient time curve of the start-up stage and the Stribeck curve, it is predicted whether the current engineering plastics friction pair to be measured will produce friction noise under the current working condition of the grease to be measured.The application method comprehensively covers the transient energy burst and the double instability mechanism of steady-state negative damping, effectively and accurately predicts whether the engineering plastics friction pair produces friction start noise.
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