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FEM 을 이용한 용접형 금속 벨로우즈의 스프링 상수 해석
박창호(Piao Chang-hao),조종두(Cho Chong-du),허준용(Heo Jun-yong),김명구(Kim Myung-gu),이재한(Lee Jae-han) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This study tries to analyze the spring constant of welded metal bellows by using FEM. For the purpose of application and newly design of welded metal bellows, the prediction of spring constant is very important. We employ a commercial package of ANSYS 8.0 to analysis the spring constant and use UTM to test the spring constant. Plane 42 and shell 51 element are used for spring constant analysis. The predicted spring constants are compared with the experimental one to discuss the rationality of spring constant analysis process. The analytical result agrees well with experimental data hence explaining the validity of FEM model.
김명구(Myoung-Gu Kim),박철희(Chul-Hui Pak),조종두(Chong-Du Cho),박창호(Chang-Hao Piao) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Experimental and theoretical study of the non-planar response motions of a circular cantilever beam subject to base harmonic excitation has been presented in this paper work. Theoretical research is conducted using two non-linear coupled integral-differential equations of motion. These equations contain cubic linearities due do curvature term and inertial term. A combination of the Galerkin procedure and the method of multiple scales are used to construct a first-order uniform expansion for the case of one-to-one resonance. The results show that the non-linear geometric terms are very important for the low-frequency modes of the first and second mode. The non-linear inertia terms are also important for the high-frequency modes. We present the quantitative and qualitative results for non-planar motions of the dynamic behavior.
박철희(Park, Chul-Hui),조종두(Cho, Chong-Du),박창호(Piao, Chang-Hao) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.12
The non-linear responses of a slender rectangular cantilever beam subjected to lateral harmonic base-excitation are investigated by the 2-channel FFT analyzer. Both linear and nonlinear behaviors of the cantilever beam are compared with each other. Bending mode, torsional mode, and transverse mode are coupled in such a way that the energy transfer between them are observed. Especially, superharmonic, subharmonic, and chaotic motions which result from the unstable inertia terms in the transverse mode are analyzed by the FFT analyzer The aim is to give the explanations of the route to chaos, i.e., harmonic motion \longrightarrow superharmonic motion \longrightarrow subharmonic motion \longrightarrow chaos.