In the process of automobile braking, the interaction between the temperature and the dynamic stress of disc brake is a very complex work. In order to simulate this problem accurately, a three-dimensional finite element model was built. Meanwhile the displacement and thermal boundary conditions for solution were determined, in which the coefficient of convection varies with the transient changing of temperature and time. The distributions of stress field and temperature field of the rotor and pads in an emergency braking were analyzed by the direct coupling method. The results of analysis prove that the thermal-structural direct coupling method can simulate the interaction between the stress field and the temperature field more exactly than the axisymmetric method and sequential coupling method do. The changing of stress field is mainly influenced by the temperature field. The results extracted from coupled simulation can give references for the material selection and structural designs in the development of disc brake.
a heat engine coupling analysis with the method of three-dimensional finite element model of a specialized caliper disc brake is built. In addition, working condition analysis of an emergency brake has also been completed to get the temperature rise, the stress level and their distribution regularity. What's more, possible failure causes are also added as well. The results demonstrate that analysis results is basically in line with the real working condition, which can be a definite guidance to design the caliper disc brake.Keywords-Vehicle Engineering, caliper disc brake, heat engine coupling, thermal stress, finite element method.
Based on the research on the internal characteristic of the passive-suspension, in this paper, we get the piecewise linear damping coefficient of the two-mode variable damper, and the speed characteristic matching it. To meet the requirements of the damper's speed characteristic, an optimum design method based on the vehicle's parameters and the damping range was established. The valves' parameters were determined, and by simulation, we got the indicator diagram under different excitations and its comparison diagram compared to theoretical speed characteristic. The results indicate that, the external characteristic of the designed variable-damper is in accordance with the typical damper's characteristic, and this design method can help to design variable dampers.
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