Estimating The Thermal Boundary And Reconstructing The Temperature Distribution Of The Brake Disc

Brakes are extremely important core components for vehicle safety system. Brake will be accompanied by a strong field of temperature, stress and wear of the coupling phenomenon during braking process. The premise of studying the coupling phenomenon is obtaining the accurate temperature distribution of brakes during the working period, which has a crucial significance on the brake design optimization, control and braking strategy.With the rapid development of computer science and computational performance, numerical simulation method has been widely used in the study of the temperature field in the brakes. However, during the recent researches on the temperature of brakes, there is a problem about insufficient understanding on heat flux partition coefficient of friction, which will have adverse impact on its determination of thermal boundary conditions(the heat flux distribution on the interface between brake discs and friction plates) and then the solution cannot be obtained accurately to reflect actual changes in temperature field in the process of numerical simulation for brake temperature. To solve this problem, the usage of inverse heat transfer problem method for calculating the thermal boundary conditions according to internal temperature of brake disc's measuring point information and thermal analysis on this basis could be a viable approach.In this paper, the dynamic matrix control inverse algorithm will be used to calculate the transient thermal boundary conditions of disc brakes and then reconstruct the temperature distribution. The main work is as follows:The establishment of a two-dimensional heat transfer model of disc brake(Forward problem model), the finite volume method is applied to solve transient temperature distribution of the brake disc during braking, and the correctness of the model was validated.We established an inverse model on MATLAB software platform according to the measuring temperature information of brake disc's inner points combined with forward problem model. Regarding brake disc's surface heat flux distribution as the inversion amount, using dynamic matrix control inverse algorithm for the reconstruction of the transient temperature field of brake discs.Numerical experiments are performed to obtain the transient heat flow and the brake disc's temperature field under two working status, and discussed the effects of the temperature measuring points,the measurement errors, the future time steps and the location of measuring points on the predicted results, which has proved the validity of dynamic matrix control inverse algorithm method for solving the disc brake thermal boundary conditions and temperature field reconstruction issues.