基于iSIGHT软件的协同优化算法若干问题研究 -- 西北工业大学,2013,31(1):145-149
论文:2013,Vol:31,Issue(1):145-149
引用本文:
温庆国, 宋保维, 王鹏. 基于iSIGHT软件的协同优化算法若干问题研究[J]. 西北工业大学
Wen Qingguo, Song Baowei, Wang Peng. Some Problems of Collaborative Optimization Based on iSIGHT[J]. Northwestern polytechnical university

基于iSIGHT软件的协同优化算法若干问题研究
温庆国, 宋保维, 王鹏
西北工业大学 航海学院, 陕西 西安 710072
摘要:
协同优化算法的学科自治,系统协调思想易被工程设计者所接受,有很广的发展前景。文中基于iSIGHT软件,通过对该算法的研究,发现存在3个问题:松弛因子ξ的取值带有一定的主观性和盲目性;系统最优点若在约束边界上,协同优化算法往往会收敛到一个不满足子学科约束的最优值;动态松弛法在某些情况下有可能无法达到预期的增强全局搜索能力的目的。针对上述问题提出如下解决方法:结合算法的准确性和快速性给出了ξ的推荐取值区间;采用区间微缩法消除了系统最优值违背子学科约束的情况,提高了算法的适用性;改进了动态松弛法使其全局搜索能力进一步增强。最后经算例验证了上述方法的有效性,在一定程度上充实了协同优化算法体系。
关键词:    协同优化    松弛因子    区间微缩法    动态松弛法    全局最优   
Some Problems of Collaborative Optimization Based on iSIGHT
Wen Qingguo, Song Baowei, Wang Peng
College of Marine Engineering,Northwestern Polytechnical University,Xi'an 710072,China
Abstract:
The Collaborative Optimization (CO) is an easily accepted technique which has been utilized by engi-neering designer.There are three problems on how to actualize CO in iSIGHT: (1) the ξ called the relaxation pa-rameter has some subjectivity and blindness in choosing an exact value; (2) CO will be converged sometimes at apoint which does not meet the constraint of sub-discipline, if the actual optimal point is at the boundary of the sub-discipline constraint; (3) a technique called the Dynamic Relaxation could not improve the ability of universalsearch under some conditions.We emphasize that, in the full paper, we explain the methods of solving these threeproblems in some detail.The core of our explanation consists of: “The first topic is how to confirm an exact ξ.Inthe first topic, the optimal points of CO based on the diverse ξ have been calculated, and an advisable region of ξhas been given.The second topic is the case that the optimal point violates the constraint of sub-discipline.Amethod called the Shrunk Region improves this situation based on the confirmed ξ.The third topic is about the Dy-namic Relaxation.In this topic, an improved Dynamic Relaxation has been developed.Section 1 describes the flowof CO by iSIGHT.The history plot of response f is shown by Fig.5.Subsections 2.1, 2.2 and 2.3 introduce howthe problems have been discovered, analyzed and solved by certain methods.Tab.1 gives the optimal points of CObased on the diverse ξ.Fig.6 shows how the Shrunk Region improves this situation based on the confirmed ξ andenhances its applicability.An improved Dynamic Relaxation has been introduced in subsection 2.3 which increasesthe probability of finding global optimal point, and the history plot of response f is shown by Fig.10.”.
Key words:    algorithms    calculations    computer software    constrained optimization    flowcharting    global optimiza-tion    iterative methods    probability    schematic diagrams;collaborative optimization    dynamic relaxa-ion    relaxation parameter    shrunk region   
收稿日期: 2011-12-20     修回日期:
DOI:
基金项目: 国家高新技术研究发展计划(2011AA09A104);西北工业大学“翱翔之星”(11GH0317)资助
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作者简介: 温庆国(1981-),西北工业大学博士研究生,主要从事水下航行器总体设计技术及多学科设计优化技术研究.
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