Abstract
Thermoelastic vibration is the main cause of brake jitter and noise, including significant fluctuations in temperature, thermal stress, structure size and braking moment. In order to improve the reliability of thermoelastic vibration results, a multi-physical field coupling modeling method is proposed in this paper, which can realize the simultaneous calculation of temperature field, stress field and air flow field. Firstly, the theoretical analysis of the whole braking coupling process and feasibility analysis is carried out. Secondly, ABAQUS solid model and FLUENT fluid model are established respectively, and MPCCI is used to share the parameters of the two models, including temperature, node displacement and heat transfer coefficient. Finally, different paths are constructed to study the fluctuation of thermoelastic parameters in different directions. The research conclusion of thermoelastic vibration can provide important basis for optimization of brake NVH (Noise Vibration and Harshness).
Highlights
When disc brake is working, a large amount of heat generated by friction between brake disc and brake pad is transmitted to the friction pair through the thermal diffusion process of different materials [1]
This thermal instability will generate a tropical zone on the surface of the brake disc, which will lead to significant fluctuations in thermoelastic vibration, including temperature, thermal stress, deformation and brake moment
The thermoelastic vibration phenomenon of brake is studied by means of multi-physical field coupling in the paper
Summary
When disc brake is working, a large amount of heat generated by friction between brake disc and brake pad is transmitted to the friction pair through the thermal diffusion process of different materials [1] This thermal instability will generate a tropical zone on the surface of the brake disc, which will lead to significant fluctuations in thermoelastic vibration, including temperature, thermal stress, deformation and brake moment. The coupled calculation of temperature field and stress field can be realized precisely by thermo-mechanical coupling, but the dynamic change of heat transfer coefficient in time and space that caused by air flow cannot be considered by this method, which will occur errors in temperature field results inevitably. The scheme can accurately calculate the temperature field, stress field, size fluctuation and braking moment fluctuation of the brake disc
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