SHAPE AND SIZE OPTIMIZATION OF TRUSS STRUCTURES WITH FREQUENCY CONSTRAINTS USING ENHANCED CHARGED SYSTEM SEARCH ALGORITHM

Natural frequencies are relatively easy parameters to obtain and they represent useful information about the dynamic behavior of structures. Controlling these parameters can help the designer to minimize destructive effect of dynamic loading on the structure. Apart from the aforementioned practical application, weight optimization of the structures with frequency constraints is a notorious problem because of its highly non-linear behavior. Thus form a challenging field to apply the optimization techniques. In this paper, the charged system search algorithm and its enhanced version are utilized to optimize various truss structures with multiple frequency constraints. The examples investigated here, are well-known benchmark problems. The results show that the presented algorithms perform better than other optimization techniques for most of the benchmark examples.