서지주요정보
하중종속기저와 미분기저를 이용한 변형다물체 시스템의 동적해석 = Dynamic analysis of deformable multibody system using load dependent bases and derivative bases
서명 / 저자 하중종속기저와 미분기저를 이용한 변형다물체 시스템의 동적해석 = Dynamic analysis of deformable multibody system using load dependent bases and derivative bases / 이학수.
저자명 이학수 ; Lee, Hak-Soo
발행사항 [대전 : 한국과학기술원, 1994].
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등록번호

8004211

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 94017

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리뷰정보

초록정보

The purpose of this study is the selection of appropriate bases for the generalized coordinates of a linear and nonlinear deformable bodies in multibody system to improve the computational efficiency for the dynamic analysis. The dynamic equations of a beam-like deformable body which has a rigid body motion coupled with elastic deformation are derived by the principle of virtual work. These deformable bodies are discretized by finite elements. To reduce the number of generalized elastic coordinates resulting from the discretization, the vibrational normal modes, the load-dependent Ritz vectors, the derivative modes and the nonlinear static modes are employed for various dynamic systems. For the impact system, the load-dependent Ritz vectors are tried as a basis for the generalized coordinates of a deformable body. Each of these vectors is obtained from the deflection by a unit force applied at the special point of the elastic body. The impact surfaces of two bodies are modeled as a nonlinear spring-damper system. Comparisions of computational results are presented for three examples. Then it is shown that the load-dependent Ritz vectors provide efficient bases for the analyses of the impact problems. For the nonlinear deformable system, three dynamic cases are presented. In case of the rotating beam analysis, the vibrational normal modes and their derivatives at initial, and steady state configurations are tried as a reduction bases. Two examples are carried out and it is shown that the computational efficiency are increased when the steady state modes and derivatives are added to the reduction bases. In the analysis of fixed-fixed beam with a step loading case, the normal modes and derivative modes at the static equilibrium and the nonlinear static mode are employed. The solutions of this reduction models are converged to the FEM full model solution but the other solutions of the reduction model are not. In the nonlinear mechanism analysis, only the vibrational modes and their derivative are employed. Two examples, such as a slider crank and four-bar mechanisms, are presented to illustrate the effect of geometric nonlinearities. The solutions of the bases well represent the nonlinear behavior of the deformable body.

서지기타정보

서지기타정보
청구기호 {DME 94017
형태사항 xiv, 126 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 수록
저자명의 영문표기 : Hak-Soo Lee
지도교수의 한글표기 : 윤용산
지도교수의 영문표기 : Yong-San Yoon
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 115-120
주제 Bases (Linear topological spaces)
Deformations (Mechanics)
Finite element method.
Nonlinear mechanics.
기저. --과학기술용어시소러스
유한 요소법. --과학기술용어시소러스
비선형 시스템. --과학기술용어시소러스
변형. --과학기술용어시소러스
동력학. --과학기술용어시소러스
Dynamic analysis.
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