Optimization of coupling stiffness obtained from closed-loop coupling model for a disk brake

For determining the coupling stiffness of key coupling interfaces in a disk brake, firstly a modal test is performed on a stationary disc brake with both hydraulic pressure and braking torque applied to get modal parameters. Then non-linear optimization method is used to minimize the differences between the results of model calculation and stationery modal test, thus a coupling stiffness is obtained which is as close as possible to the real operation condition. Finally the results with optimized model and original model are compared with bench test results. The outcomes show that the unstable modes calculated with the coupling stiffness obtained from optimized model are closer to the results of brake squeal bench test than that with original model, verifying the rationality and effectiveness of the method proposed.