Multi-objective optimization of disc brake structure based on heat transfer performance

Abstract

As an important basis for its structural optimization design, the heat transfer performance has a key influence on the reliability of automobile brake. Based on the finite element method, the transient heat transfer of automobile disc brake is analyzed under the condition of dynamic convection heat transfer coefficient. According to the simulation results, the CCD (Central Composite Design) sampling scheme is used to transform the optimization variable and target variable into multiple design points in the decision space. The optimization variable includes the total thickness, the height of the ventilation slot, the angle between the sides of the ribs, the number of ribs while the target variable includes the mass and temperature peak. According to the multiple quadratic regression model, the response surface function is constructed, and the approximate model of optimization analysis is obtained. The error analysis shows that the response surface function is equipped with good fitting accuracy. In order to facilitate the extremum search, the optimization of the quality is transformed into the constraint condition, and the multi-objective optimization problem of the brake disc is transformed into the single objective optimization problem. Through the sequential quadratic programming method, the Pareto optimal solution set of the optimal mathematical model is found. The results show that the temperature peak value is reduced by 7.8 % under the condition where the quality of the ventilation plate is basically unchanged. By weighting the Pareto optimal solution sets of different quality intervals, a good result evaluation of ventilation panel optimization is achieved.

Multi-Objective Optimization Design of an Origami-Inspired Combined Cushion Airbag

“…Based on the stress contours of the cushion airbags, the maximum stress strength criterion is utilized to evaluate the strength of the cushion airbags, indicating that the cushion airbag meets the design strength requirement and the material does not undergo any plastic deformation. To evaluate the cushioning performance, two key indicators are employed here: maximum overload and specific energy absorption (SEA) during the landing attenuation process [23]. The expression of SEA is…”

“…Through a calculation using Equation (10), the SEA of the cushion airbags is 1648 J/kg. The results, To evaluate the cushioning performance, two key indicators are employed here: maximum overload and specific energy absorption (SEA) during the landing attenuation process [23]. The expression of SEA is…”

“…The static/dynamic friction coefficients of the contact are defined as 0.6. The contact between the airbags adopts a self-contact, and the static/dynamic friction coefficients of the contact are also defined as 0.6 [23].…”

A Co-Simulation Platform with Tire and Brake Thermal Model for the Analysis and Reproduction of Blanking

“…This heat follows a double path, with a portion dissipating into the ambient air through strategically designed intakes, thereby averting the risk of thermal fatigue fractures. Simultaneously, this thermal energy very much affects the temperature of the rim of the tire which heats the internal air of the wheel, thus affecting the pressure, and subsequently also affects the temperature of the layer-defined inner liner in direct contact with the air inside the tire [4][5][6]. The inherent variability among race tracks, dictated by distinct characteristics such as velocity profiles, turn geometries, and energy dissipation levels, renders the task of maintaining tires within their ideal thermal operating range a complex undertaking.…”