서지주요정보
허용하중 집합과 새로운 구조물의 최적설계 수식화에 관한 연구 = Concept of allowable load set and its use for a new structural optimal design formulation
서명 / 저자 허용하중 집합과 새로운 구조물의 최적설계 수식화에 관한 연구 = Concept of allowable load set and its use for a new structural optimal design formulation / 김재현.
저자명 김재현 ; Kim, Jae-Hyun
발행사항 [대전 : 한국과학기술원, 2002].
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소장정보

등록번호

8013634

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 02047

SMS전송

도서상태

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반납예정일

초록정보

Allowable Load Set (ALS) has been introduced as a new concept, which allows an understanding of some unique characteristics of a structure in relation to its integrity under uncertain loading conditions. The ALS helps visualize the relation between a prescribed load and a degree of safety of the structure. Using the cone property of ALS, however, efficient algorithms for the ALD have been possible without adding slack variables. It is only required to select the active constraint nearest the origin in the load space. For linear structural problems, one finite element analysis is enough to obtain the information on the stress and displacement coefficients that is necessary for checking the constraint equations. During the application of the algorithms, critical or weak areas of the structure can be identified and can be related to the particular load that makes them critical. Examples shown have illustrated the nature of the ALS and the algorithms developed. A methodology to obtain the ALS of multi-body mechanical systems with a minimum number of finite element analyses is introduced and shown very effective in understanding the safety characteristics of multi-body systems. A new reliability measure based on the concept of the ALS, which is called a relative safety index, is defined as the distance to ALD from the prescribed mean load. This safety index does not require any probability data, but is a good indicator of structural integrity especially when they are not available. As illustrated by examples of excavator, robot arm and Stewart platform, the analysis by ALS reveals important characteristics of the structural integrity of a system. By maximizing a relative safety index, a robust design can be obtained. This criterion is adopted to obtain a new biomechanical formulation of stable working postures and results are compared with those by previously used force minimization approach. It is also shown that how low back disorders affect working postures and human body reactions. The criterion is also applied to optimize multi-body systems, for examples, a planar Stewart platform and an excavator. A slightly modified global optimization algorithm is utilized for the multi-body system examples based on a multi start method with domain elimination. Although the suggested approach takes more time, it produces more local solutions increasing the probability of finding the global solution. In summary, it is shown that the ALS is a useful concept not only to show the characteristics of the structural integrity of a system, but also to do a robust design without knowing detailed probability data.

서지기타정보

서지기타정보
청구기호 {DME 02047
형태사항 xii, 99 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : A, 오일러-뉴튼 법
저자명의 영문표기 : Jae-Hyun Kim
지도교수의 한글표기 : 곽병만
지도교수의 영문표기 : Byung-Man Kwak
수록잡지명 : "Concept of allowable load set and its application for evaluation of structural integrity". Mechanics of structures and machines, v. 30 no. 2, pp. 213-247 (2002)
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학전공,
서지주기 참고문헌 : p. 91-98
주제 허용하중
강건설계
전역최적화
인체역학
Allowable load
robust design
global optimization
biomechanics
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