| Summary: | 碩士 === 淡江大學 === 航空太空工程學系碩士班 === 102 === The Harmony Search (HS) Algorithm was applied to the optimum design of structures in this study. The Harmony Search algorithm was conceptualized using the musical process of searching for a perfect state of harmony. The best natural musical performance occurs when a musician searches a best state of harmony, just as the optimization process searches to find a global solution. The set of sounds are produced by a group of instruments, just as objective function is determined by the set of the values produced by design variables . The sound for better harmony can be improved through practice over and over again, just as the values for better objective function can be improved through iteration by iteration. Therefore the heuristic algorithm derived from an artificial phenomenon found in musical performance, in essence the process of searching the better harmony, can be implemented. The Harmony Search algorithm does not require the setting of initial values of decision variables and uses the random search based on the Harmony Memory Considering Rate (HMCR) and Pitch Adjusting Rate (PAR) for guiding a global search. These features increase the flexibility of the HS algorithm and obtain better solutions efficiently.The FORTRAN and APDL of ANSYS software are integrated into a systematic Harmony Search optimization program. The optimization problem can be transformed into a mathematical function. Minimum weight design will be developed in six numerical examples. Then the optimum deign of structures can be obtained by Harmony Search algorithm. The results of Harmony Search algorithm are better than other references in the examples.
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