Brake material friction coefficient evaluation method

Abstract

The invention discloses a brake material friction coefficient testing method. When the rotating speed of a main shaft of a testing machine reaches a specified value, axial load is applied to a sample. A dynamic friction sample with an average friction coefficient, a static friction sample and a dynamic friction sample with a transient friction coefficient are tested at different braking speeds, temperatures and specific pressures to obtain the average friction coefficient and the transient friction coefficient. The average friction coefficient and the transient friction coefficient are subjected to temperature field and vibration simulation, and the matching degree of the result and the test is 98%. Friction coefficients of a brake material under different brake rotating speeds, different temperatures and different specific pressures are considered, technical support is provided for finite element simulation of brake wheel temperature and vibration problems, temperature analysis and brake vibration analysis based on the friction coefficients are carried out through finite elements, a weak area with the high temperature is obtained, before the test, the structure of the brake disc is improved, and corresponding anti-vibration measures are taken, so that the economic loss caused by test failure is reduced, and the cycle of repeated test is shortened.

Description

technical field [0001] The invention relates to the field of performance testing of aircraft brake materials, in particular to a method for measuring the relationship between the friction coefficient of brake materials and temperature, specific pressure and brake speed. Background technique [0002] Aircraft wheel brakes are a complex multi-degree-of-freedom dynamic system. Among all aircraft equipment, the working conditions of wheel brakes are second only to engines in terms of severity, and the complexity of the mechanical problems involved is almost equivalent to that of aircraft engines. Wheel brakes are the core elements to ensure the safety and reliability of aircraft take-off and landing, an important link to improve aircraft maintainability and economic indicators, and an important guarantee to enhance aircraft maneuverability and combat effectiveness. With the rapid development of aviation technology, the fundamental problem in the process of thermal protection and...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency that the existing technology cannot obtain the friction coefficient value that changes with the rotational speed V, the specific pressure P and the temperature T during the whole process of braking, the present invention proposes A method for testing the coefficient of friction of brake materials

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