The disc brakes on ADAMS simulation of flexible multibody

With the social and economic development, cars have become an important means of transport in the daily life of one of the brakes on car safety and comfort important influence, how to reduce brake noise and vibration has become an important topic in social studies . Paper introduces the development history of the brake, brake noise and vibration research status at home and abroad, and then introduced a multi-flexible body dynamics model of the theoretical basis of self-excited vibration of disc brake theory, this study provides for the brake theory basis; followed by the use of a dynamic finite element software ANSYS and ADAMS software disc brake set up dynamic model of flexible multi-body methods and steps of how to use finite element software ANSYS brake discs and brake pads to establish the mode of neutral File (MNF), and in the process of the brake discs and brake blocks free modal analysis; be modal neutral file, brakes and more flexible body dynamics model in ADAMS, the modeling process, including: Import flexible body, through the preparation of the flexible macro systems impose fixed disk and brake pads to reduce the computational dumb objects; on imported components is required rigid body confers certain material properties, followed by the assembly, adding constraints between the components Finally, the model calibration. For the brake disc and brake pads are pressure and friction between the contacts with the preparation of Leehom commands ways. Disc brake on the flexible multi-body dynamics model of the simulation, the brake disc angular velocity, angular deceleration, friction and other curves. Brake disc compared under different friction coefficients of these simulation curves we can see: brake disc and brake pads with the friction between the friction coefficient increases, but the friction coefficient, the more likely to occur brake noise and vibration, This will affect the vehicle's comfort and stability; reduce the friction coefficient, although you can effectively reduce brake vibration and noise, but also lower the car's braking performance. So in the choice of brake friction materials necessary to meet the braking performance of vehicle braking requirements, we need to meet automotive requirements for comfort and stability.Installation error occurred in the car brakes, the brake disc axis of rotation axis does not coincide with their own circumstances, can cause the car brake noise and vibration.Modeling process not only considers the deformation of brake discs and brake pads on the brake performance, taking into account the quality of vehicle rotation and translation effects on vehicle braking performance, so that the disc brake of the simulation more realistic situation. This modeling method is universal, the modeling for all types of brake, brake noise and vibration analysis and structure optimization design of an effective reference method. 

Keywords: disc brake, vibration, virtual prototyping, flexible multi-body model