http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Hirpa Lemu (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
Development of a metamodel assisted sampling approach to aerodynamic shape optimization problems
Amir Safari,Adel Younis,Gary Wang,Hirpa Lemu,Zuomin Dong 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.5
A new metamodel-assisted sampling search approach applied to the aerodynamic shape optimization of turbomachinery airfoils is presentedin this paper. The proposed methodology integrates a non-uniform rational B-spline (NURBS) geometry representation, a twodimensionalflow analysis, and an improved metamodel driven optimization algorithm named approximated promising region identifier(APRI), which represents a momentous advancement of the existing space exploration techniques specifically for the high-dimensionalexpensive black-box (HEB) problems. The novel optimization method prospects the whole design space by generating sample points,reporting evaluating information using a surrogate model, and then focusing the search in the most promising region by deploying moreagents. Using the integration of these adaptive tools and methods, the optimization results are considerably promising in terms of computationalefficiency and performance enhancement of the turbomachinery blade airfoil shape in both design and off-design conditions.
-
Analytical approximation of nonlinear vibration of string with large amplitudes
Mojtaba Parvizi Omran,Amin Amani,Hirpa Gelgele Lemu 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.4
Study of nonlinear problems in strings with large amplitude is a very important research area in many fields of physics and engineering. variational approach method (VAM) is in particular selected because the method is appropriate to solve nonlinear vibration of a constanttension string. VAM is an explicit method with high capability for resolving strong nonlinear oscillation system problems. It has been found that VAM is well suited for a range of parameters and the approximate frequencies and periodic solutions show a good agreement with the exact ones. This paper compares the various aspects of VAM in relative to exact approaches and higher-order approximate solutions for the constant-tension string. The comparison indicates that VAM is very fast, effective and convenient. The method does not require any linearization or small perturbation, and it leads to high accuracy of the solutions in a single iteration.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
