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    Title: 改良式調和搜尋演算法於結構之最佳化設計
    Other Titles: An improved harmony search algorithm for structural optimization
    Authors: 劉宇哲;Liou, Yu-Jhe
    Contributors: 淡江大學航空太空工程學系碩士班
    張永康
    Keywords: 調和搜尋演算法;最佳化設計;Harmony Search Algorithm;Optimum Design
    Date: 2015
    Issue Date: 2016-01-22 15:05:18 (UTC+8)
    Abstract: 調和搜尋演算法是一種模仿樂團演奏練習將曲目調整至最協調的現象應用到最佳化系統之方法。調和搜尋演算法參數設定簡單並以隨機方式進行搜尋,可以作大範圍之全域搜尋。本研究是應用改良式調和搜尋演算法於結構最佳化設計之研究。改良式調和搜尋演算法採用了新的改良機制,藉由線性變化的調和記憶考慮機率及調音機率改善搜尋範圍的控制能力,並改良微調步距隨搜尋過程作變化增加區域搜尋能力,以提升準確性並優化搜尋能力。
    本研究將ANSYS有限元素分析軟體中的APDL語法與FORTRAN程式結合成一系統程式,並以六種不同的範例執行結構最佳化設計。數值範例中將對各種結構做分析與討論,以結構輕量化為目的。範例中將結構最佳化問題轉為數學函數,再利用改良式調和搜尋演算法對結構系統執行最佳化設計。由數值分析範例之結果,顯示改良式調和搜尋演算法於結構最佳化設計上可得到不錯的結果。
    The Harmony Search (HS) Algorithm is conceptualized by using the musical process of searching for a perfect state of harmony. The HS algorithm does not required the setting of initial values of decision variables and was used stochastic random search. In addition, the HS algorithm is simple in concept, few parameters needed, and easy implementation. The Improved Harmony Search (IHS) Algorithm for structural optimization is developed in this study. IHS employs a novel method that enhances accuracy and search capability of harmony search (HS) algorithm. The harmony memory consideration rate (HMCR) and pitch adjustment rate (PAR) are linearly adapted by the improved mechanisms proposed. The distance bandwidth (BW) is dynamically adjusted to favor exploration in the early stages and exploitation during the final stages of the search process.
    The FORTRAN and APDL of ANSYS software are integrated into a systematic IHS 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 IHS algorithm. The results of IHS algorithm are better than other references in the examples.
    Appears in Collections:[航空太空工程學系暨研究所] 學位論文

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