制动盘几何特征对结构模态特性影响仿真分析

Analysis of Rotor Geometry Specifications to Structural Modal Characteristics Modification of Vehicle Brake Disc

针对几何特征参数改变对汽车制动盘结构模态特性的影响进行仿真分析,探索通过几何形状变化控制制动盘制动尖叫的可行性。首先建立了制动盘的ANSYS有限元模型,利用试验模态分析结果验证模型正确性的基础上,然后定量分析了安装凸台直径与高度、盘体直径与厚度、散热辐条分布密度的变化对前七阶自由与约束周向模态频率的影响。分析发现:盘体直径与厚度、散热辐条分布密度和安装凸台直径与高度对模态特性影响依次减小;盘体直径与厚度改变可以作为考虑轻量化和热容量的面向制动盘结构模态修改的途径。

The effect of the rotor geometry specifications variation on brake disc modal characteristics was numerically investigated to analyze the feasibility of geometry specifications to vehicle disc brake squeal control. Firstly a finite element model of brake rotor was established in ANSYS software and was validated by comparing the simulation results with the experiment results of the first 7 natural frequencies. Then the effect of geometry specifications on the free and restrict natural frequencies, including brake rotor hat＇s diameter and height, disc diameter and thickness, and the number of ventilated blades, were analyzed based on FEM calculation. It is found that the effect of the three type geometry specifications are ranked as disc diameter and thickness, ventilated blades number and hat structure diameter and height, and that the disc diameter and thickness can be taken into account for further modal optimization considering both weight-light and thermal capacity.