Shape Optimal Design for Tori of Torque Converter using Design of Experiments

Abstract

(2) the optimum TC shape that meets the requirements is achieved. As a result, it is expected to contribute to reduce product design cost and time, which were required due to repetitive design changes and performance evaluation. Then, an inexperienced designer would become capable of efficient TC design.; Recently, a new concept torque converter (TC) is required to be smaller than before while improving the efficiency in power transmission, in order to reduce the vehicle weight and improve the fuel economy. However, consumptive redesigns and design changes have to be repeated to find the optimum design of TC with satisfying the required space and performance. In addition, a lot of time and cost are required in the testing processes and analyses for TC performance evaluation. This paper proposes a method for supporting TC design satisfying the requirements using a concept of optimal shape design. This approach is accomplished through correlation analyses between the TC performance and the TC shapes. As a method of optimization, we adapted design optimization based on approximate model. To make approximate model, OA(Orthogonal array) was used as DOE(Design of Experiments). The PR(polynomial regression) method was selected as an approximate model. To find optimum value of the PR, STDQAO(Sequential Two-point Diagonal Quadratic Approximate Optimization) was used as an optimization algorithm. The proposed method has two objectives: (1) the TC hydrodynamic performance is predicted with a few geometric parameters in the conceptual design phase