Optimal Design of Torque Converter Blade Angle Based on Surrogate Model Method

Abstract In this paper, the blade cascade system of the basic torque converter JQB 2 is redesigned and changed into a hydraulic torque converter with an adjustable stator. Firstly, the basic torque converter cascade system is modified to realize the adjustable stator. In order to study the influence of the blade angles on the performance of the torque converter, the blade angles were parameterized. Taking the peak efficiency of the torque converter at the design opening as the optimization objection, the pump torque factor is not less than 90% of the initial torque converter as the constraint condition. The central composite experimental design method was used to generate 49 design points, and the Kriging surrogate model was selected to construct the response surface of efficiency and pump torque factor, and to verify the goodness of fit of the response surface, and then iteratively search for the optimal response surface. The peak efficiency of the optimized JQB 2 X is 89.7%, which is 1.6% higher than that before optimization. After optimization, the pump torque factor is 6.1×10 −6 , which is slightly lower than that of the basic torque converter, but it can still maintain the large capacity of the torque converter.