盘式制动器刹车片钢背结构对制动噪声影响研究

通过改变刹车片钢背形状方法来研究汽车制动噪声,主要分为2阶段:1)通过建立实体和运动学模型进行分析和仿真研究; 2)采用声振实验进行验证.在声振实验过程中,采取激光测振仪以及LMS冲击锤2个实验,同仿真分析结果交叉对比以证明仿真分析的准确性; 采用3层结构的刹车片,相比传统的2层结构刹车片,该刹车片在不改变制动强度、保证安全系数的基础上具有更好的阻尼特性,有效地抑制噪声的发生.根据制动器噪声台架试验的结果,确定了刹车片固有频率对制动器噪声的贡献,并在此基础上,设计了不同结构形状的钢背刹车片来改变刹车片固有频率,利用ANSYS进行模态分析并制作样品进行噪声实验.仿真和实验结果表明,新设计的钢背刹车片能有效地减小汽车制动噪声的产生.

The Contribution of Back Plate Shape of Brake Pad to Disc Brake System Noise

The purpose of this study was to study brake squeal by changing the shape of back plate of brake pad,which can be divided into two phases,3D model and dynamic model is built during first phase,the second phase is verification experiment.Laser vibration detector and LMS hammer impacting are applied during the experiment phase,these two experiments are for the cross comparing with accuracy of simulation result; three layer structure brake pad is proposed in this paper,which gets more damping characteristics comparing to traditional two layer structure and reduce the occurrence of brake squeal.Baseline bench experiment is set to confirm the contribution of natural frequency of back plate to the brake noise.Based on simulation and test results,two modifications have been done on back plate to change the critical frequency of braking pad,modal analysis and noise bench test are also carried on these two new models.Finally,comparing the results of both two new types braking pads to research the effect of back plate change on disk brake system brake noise.The test result returns that the new design back plate can reduce the occurrence of brake squeal.