Abstract
Cold mechanical vibration of air-cooled brake disc is mainly caused by the non-uniform geometry, including disk thickness variation (DTV) and side face run-out (SFR). A mathematical model consisting of the non-uniform geometry is constructed, which is imported into the dynamic brake model established by Lagrange equation as initial parameters. The braking moment fluctuation during braking process is obtained by MATLAB software. The experimental verification is realized based on Link3900 NVH test platform, where result shows that the calculated brake pressure is quite consistent with the test value. By single variable method, the key influence factor that affected braking moment fluctuation is analyzed, including DTV, SFR, friction coefficient, contact stiffness coefficient and damping coefficient. The conclusion shows that reducing these parameters within a certain range can significantly reduce the amplitude of cold vibration, except for the contact damping coefficient.
Highlights
Disc brake is one of the most widely used brakes in automobiles at present
As an important and common problem in disc brakes, cold mechanical vibration is mainly caused by the non-uniform geometry formed by machining, assembly, non-uniform wear and corrosion
Whether the computation of discrete vibration with multiple degrees of freedom is suitable and accurate for the disc brake cold vibration and noise research is still not quite clear. This hypothesis is put forward according to the non-uniform geometry of brake disc that caused by disk thickness variation (DTV) and side face run-out (SFR), and it can be verified by NVH experimental method that designed in the paper
Summary
As an important and common problem in disc brakes, cold mechanical vibration is mainly caused by the non-uniform geometry formed by machining, assembly, non-uniform wear and corrosion. It has a bad influence on the comfort, reliability and safety of automobiles, and accelerates the aging and fatigue damage [1] of relevant components of brake system, and increases the cost of quality assurance and maintenance. Whether the computation of discrete vibration with multiple degrees of freedom is suitable and accurate for the disc brake cold vibration and noise research is still not quite clear. This hypothesis is put forward according to the non-uniform geometry of brake disc that caused by disk thickness variation (DTV) and side face run-out (SFR), and it can be verified by NVH experimental method that designed in the paper
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