피로수명을 고려한 전방 서브프레임의 점용접 이음 위치 최적설계

Optimization of the number and location of the spot welds under fatigue conditions is a major economic consideration. Because of mass production, a small reduction of the number of spot welds, through their efficient and optimal usage. can mean a great saving in production cost. Thus, this paper addresses the optimization method for spot welds of a spot-welded structure under fatigue conditions. Location optimization is performed to enhance fatigue life of spot welds. The three-level orthogonal array is employed to evaluate the design sensitivity and the best combination of the design variables is obtained. The final design, the best combination obtained from the sensitivity information, can improve the fatigue life nearly 8 percent as that of the baseline design, while reducing the 20 percent of the number of spot welds than the baseline design.