효율적인 제한조건경계 샘플링을 이용한 신뢰성 기반 순차적 근사 최적화Reliability-based Sequential Approximate Optimization using Efficient Constraint Boundary Sampling
- Other Titles
- Reliability-based Sequential Approximate Optimization using Efficient Constraint Boundary Sampling
- Authors
- 최상인; 김지훈; 이태희; 박정수; 정상현
- Issue Date
- Nov-2019
- Publisher
- 대한기계학회
- Keywords
- 순차적 근사 최적화(Sequential approximate optimization); 순차적 근사 신뢰성 해석(Sequential approximate reliability analysis); 신뢰성 기반 최적설계(Reliability-based design optimization); 전역 최적해(Global optimum)
- Citation
- 대한기계학회 2019년 학술대회, pp.1203 - 1204
- Indexed
- OTHER
- Journal Title
- 대한기계학회 2019년 학술대회
- Start Page
- 1203
- End Page
- 1204
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/4497
- Abstract
- There are two types of sequential approximate method: Sequential approximate optimization (SAO) is a global optimization that finds a global optimum using sequentially constructed surrogate model; and sequential approximate reliability analysis (SARA) is a method that sequentially generates sample points on constraint boundaries and performs reliability analysis using surrogate model. However, the optimums in SAO are likely to fall in failure region because the optimums are found by deterministic design optimization (DDO); and SARA does not guarantee that optimum is the global optimum. Because each method has the drawbacks individually, the method is necessary that complements the drawbacks while having the advantages of each method. In this paper, reliability-based SAO that apply efficient constraint boundary sampling (ECBS) to SAO is proposed to obtain the global optimum in RBDO problem. Reliabilitybased SAO generates sample points sequentially on the constraint boundaries that object function value is lower than the optimum and the region that is high probability of feasibility and far from existing sample points. Therefore, reliability-based SAO enhance not only the probability of finding the global optimum, but also reliability accuracy of the optimums. The accuracy of reliability-based SAO is verified by mathematical examples.
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