A MULTIOBJECTIVE OPTIMIZATION STRATEGY WITH PRIORITY RANKING OF THE DESIGN OBJECTIVES

Generally, two types of priorities are considered among multiple objec tives in the design of machine structures. One of these objectives is named the ''hard objective'' and is the absolutely indispensable desig n requirement while the other is called ''soft objective'' and has a l ower priority order. This paper proposes a multiobjective structural o ptimization strategy with priority ranking of the design objectives. F urther, this strategy is demonstrated on the actual example of a motor cycle frame structural design which has three design objectives: (1) a n increase in static torsional rigidity, (2) a reduction of dynamic re sponse level, and (3) a decrease in the weight of the motorcycle frame .