Structural optimization of ventilation channels in brake disc based on nonlinear regression

In order to enhance the heat dissipation capability of ventilated brake disc, its internal channel structure is optimized. 16 schemes of ventilation channel are proposed according to the orthogonal design of experiments, the heat dissipation power of inner wall is calculated by using CFD technique, and the significance levels of the factors affecting the heat dissipation of ventilated disc are determined with variance analysis. Then with insignificant factors ignored and the number, the inlet angle and the rib section features of channel taken as arguments, a calculation model for the heat dissipation power of inner wall in brake disk is set up based on nonlinear regression method. Finally genetic algorithm is adopted to find the optimum solutions of ventilation channel: 80 channels with an angle of 20° for both inlet and outlet and No.4 rib. The results of CFD analysis show that the heat dissipation power of inner wall of optimal ventilation channel is 10.465kW, which is 2 times as high as the lowest value among schemes in orthogonal table and is 1.62% higher than the highest value in table, meaning that the optimized ventilation channel structure can effectively improve the heat dissipation capacity of brake disc.