실험계획법을 이용한 현가 부품의 피로수명 형상 최적설계

In order to maximize the fatigue life of the suspension component of vehicle, a new shape optimization method is presented. In this method, the shape control point concept is introduced to reduce the numbers of shape design variables. Also, the two-level orthogonal array is employed to evaluate the design sensitivity of fatigue life with respect to those shape design variables, because the analytical design sensitivity information is not directly supplied from the commercial CAE softwares. In this approach, only the six design variables are used to approximate the shape of lower control arm. Then, performed are only 10 fatigue life analyses including the baseline design, 8 DOE models and the final design. The final design, the best combination obtained from the sensitivity information, can maximize the fatigue life nearly two times as that of the baseline design, while reducing the 14 percentage of weight than it.