沟槽织构化表面影响摩擦振动噪声机理

在列车制动盘蠕墨铸铁材料表面上制备出平行间隔分布的沟槽表面织构，将其和光滑表面进行摩擦噪声对比试验，并利用有限元软件ABAQUS/Explicit(显式动态求解器)对试验进行数值模拟分析，研究沟槽织构化表面影响摩擦振动噪声的机理。结果表明，本试验条件下的光滑表面会产生较高强度的噪声而沟槽表面几乎不产生噪声，利用有限元软件ABAQUS/Explicit可以很好地模拟试验现象并揭示沟槽表面织构影响界面摩擦振动噪声的机理，即沟槽织构表面在对磨球滑过并碰击沟槽时引起的摩擦力波动能有效的打断摩擦界面的连续接触，作为不连续激励扰乱系统的自激振动，抑制界面摩擦力和振动加速度高频成分的形成并最终降低摩擦噪声。

Mechanism of the Effect of Groove-textured Surface on the Friction Vibration and Noise

Groove-textured surface with parallel regular intervals is manufactured on compacted graphite iron materials (brake disc material). Experimental test and numerical simulation (ABAQUS/Explicit) are performed to investigate the influence of grooved surface texturing on friction noise, by comparing the case of smooth surface. The test results show that significant friction noise is generated from the smooth surface, while nearly no friction noise can be measured from the groove-textured surface under the current testing conditions. The results can be well simulated by using finite element software ABAQUS/Explicit. Combing the results of experimental test and numerical simulation, it is showed that the groove-textured surface in this test can effectively interrupt the continuous contact of the friction surfaces when the counterface ball slid across the edge of the groove-textured surface. This will suppress the generation of high frequency components of the friction force and vibration acceleration, disturb the self-excited vibration of the friction system, and finally significantly reduce the friction noise.