Study On Contribution Of Back Plate Shape Of Brake Pad To Disc Brake System Noise

摘要

This research focuses on braking pad back plate of disc brake system. Firstly building original 3D model of brake pad and the prototype is manufactured, then 3D model is imported into ANSYS for modal simulation and noise bench test with prototype is conducted. To verify the validity and precision of ANSYS simulation, at the original phase, two cross comparing experiments are made to verify the accuracy of simulation. With laser deformation detector and hammer impact experiment, the natural frequency and vibration modes of brake pad are confirmed. During simulation process, different restriction condition are set based on the different material characteristic of brake pad components which makes the simulation results more accurate. Above two jobs are used to detect the the contribution of back plate to brake noise. Based on simulation and test results, two modifications are 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. With the rapid popularization of automobile in the world, the requirement of vehicle riding comfort is raising, more importance is attached to vehicle NVH attributes. So far, main noise such as the noise generated by vehicle engine vibration are well handled, secondary noise like brake squeal now is becoming a hot research issue. Particularly, most passenger vehicles are applied with two disc brake systems at both front and rear tires, thus, brake squeal deserves more attention. From the 80s of 20 century, more and more scholars start to research brake noise by studying the system structure. This paper focus on the structure change of back plate of brake pad to study the influence on brake squeal. The final result shows that brake pad with structure changed back plate can reduce the occurrence of brake squeal effectively.