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압축성 오일러 방정식을 이용한 익형의 형상 설계최적화

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Alternative Title
Airfoil Shape Optimization Technique based on the Euler Equations
Abstract
오일러 방정식에 근거한 천음속 영역에서 익형의 형상설계를 위한 수치최적화 과정을 정립하였다. 여기에는 설계진행에 따라 반복적으로 설계공간을 국부적으로 제한하고 이 공간 내에서 목적함수와 제약조건을 근사하여 최적화를 수행하는 순차근사최적화기법과, 목적함수와 제약조건의 근사를 위해 좌표변형에 근거한 중간매개변수의 민감도를 이용하는 방법, 그리고 반복적 오일러 유동해석의 효율화를 위하여 표면 경계조건의 개조 등을 채택하여 전체 계산시간을 실제 설계에도 충분히 적용 가능할 만큼 감소시켰다. 근사최적화의 진행 시에는 이동한계를 설계변수 절대값으로 지정 적용하는 방법이 오일러 유동방정식을 이용한 근사 설계최적화 문제에서 가장 효율적인 것으로 판명되었다.
Numerical optimization procedures were tested for the design of airfoil shapes in transonic flow based on the Euler equations. Specific techniques such as sequential approximation optimization, sensitivity calculations of the intermediate parameter using coordinate straining and modification of Euler surface boundary conditions were implemented in the procedures to reduce computational burden. Optimization with large move limits specified in absolute values of the design variables was found to be deficient and robust in solving the approximate optimization problem based on the Euler equations.
Numerical optimization procedures were tested for the design of airfoil shapes in transonic flow based on the Euler equations. Specific techniques such as sequential approximation optimization, sensitivity calculations of the intermediate parameter using coordinate straining and modification of Euler surface boundary conditions were implemented in the procedures to reduce computational burden. Optimization with large move limits specified in absolute values of the design variables was found to be deficient and robust in solving the approximate optimization problem based on the Euler equations.
Author(s)
조창열
Issued Date
1996
Type
Research Laboratory
URI
https://oak.ulsan.ac.kr/handle/2021.oak/3865
http://ulsan.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002024416
Alternative Author(s)
Joh,Chang Yeol
Publisher
공학연구논문집
Language
kor
Rights
울산대학교 저작물은 저작권에 의해 보호받습니다.
Citation Volume
27
Citation Number
2
Citation Start Page
69
Citation End Page
80
Appears in Collections:
Research Laboratory > Engineering Research
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