Research On Structure Optimization Method Of Disc Brake For Noise Control

As a convenient transportation tool,passenger cars have become an indispensable part of our lives.With the continuous improvement of its functions,the application scenarios continue to be enriched,and the usage rate is also rising.The NVH(Noise,Vibration,and Vibration Roughness)performance of passenger car braking systems has also become an important evaluation parameter for vehicle comfort.This topic is based on the theory and research techniques of brake noise(Chapter 1 and 2).First,the finite element method is used to simulate and analyze the disc brake.Then optimize the brake pads,which is the structure most likely to cause braking noise.Finally,the occurrence probability of brake noise is reduced,and the optimization of the brake structure for brake noise control is completed.Collect the relevant parameter information of the disc brake,and reasonably simplify the actual structure of the brake.The finite element model of the brake assembly is established by Hyper Mesh software and Abaqus software,and the finite element model of the brake assembly is numerically solved.The extraction frequency is 0-16000 Hz.By analyzing the eigenvalues,negative damping ratios and mode shapes of each order of the brake,the main structure of the brake that causes braking noise is found.(Chapter 3)Based on the existing brake pad structure and research,10 sets of simulation experiments were established on the groove structure and combination form on the surface of the brake pad.The positive single sloping groove on the surface of the moving pad has the best suppression effect on braking noise.The influence of the width of the guide angle and the angle on the braking noise is analyzed through a complete experiment.Then,the comprehensive analysis of the The influence of the groove and lead angle structure on the brake noise,and the sensitivity of the structural parameters of the brake pad was evaluated by two methods,namely intuitive analysis and analysis of variance,and the optimization parameters and parameter optimization range of the brake pad structure were determined.(Chapter 4)Based on the response surface experiments,a regression equation between the optimization parameters(trench inclination angle,trench width,and lead angle width)and the response target(TOI)is established.Then,the optimal design parameter combination of the brake pad is found based on the firework algorithm.The optimized model was analyzed by finite element simulation.It was found that the brake vibration and noise tendency index(TOI)was reduced by 69.2%,which proved that the improvement of the brake pad structure to reduce the probability of occurrence of brake noise has achieved significant results.The optimization scheme is feasible.(Chapter 5).