Optimization And Parameterization Design Of The Brake Disc Based On The Matching With Vehicle

Firstly, the research source and background is introduced in this thesis, in combination with project requirements of the disc brake company, the main purpose and significances of the thesis is discussed. After the detail introductions of brake parameterization platform and ventilation and heat rejection in both domestic and overseas, according to the company’s requirements, the main principal contents of this thesis are put forward.Then, the basic methods to choose an appropriate brake for a car and the structural features of disc brakes are analyzed. The main contents to designing disc brake are also analyzed. Based on the theoretical analysis of braking dynamics and brake-heat production and rejection during braking progress, the overall plan to design the disc brake is finally affirmed.Based on the detailed analysis of the whole car basic structure and important parameters, combining with designing experience, the needed brake is designed. According to passenger vehicles’braking experimental requirements, braking efficiency of the brake when placed on the vehicle is simulated and analyzed using dynamics software. And the curves of braking distance, velocity, brake torque and braking trace in turn are all achieved.Afterwards, in order to parameterize the important parameters of brake and analyze the braking efficiency, a parameterized platform is built. The demand analysis to the module is given, and then the overall plan of it is put forward. The brake parametric design and the whole platform dialog boxes are both realized through the secondary development.After that, simplified model for brake heat flow simulation is set up, related governing equations is deduced, too. Model’ boundary conditions are analyzed and the simulation mathematical model is built. Then treating the steady-state analysis results as transient analysis’initial condition, transient analysis is preceded. The velocity distribution, heat distribution, turbulent energy distribution and so of the brake airways and around flow are obtained during different time.Finally, the optimization design to the disc brake is processed. Via theory analysis, brake disc airways are design to curve shape instead of straight shape. By comparison of the two kinds of simulation flow results, it’s found that the curve shape disc is better than straight shape in the term of heat rejection. Also, the comparison of free modes indicates that the optimized brake could avoid resonance more effectively.All of the studies not only offer a reference method and parametric platform to brake design, solve company’practical problem, but also provide a basis to brake optimization design as well as new idea and possible ways for brake design and have fine practical significance and research value.