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전역좌표계에 근거한 부분구조합성법과 국부좌표계에 근거한 부분구조합성법의 비교
곽문규(Kwak, Moon-K.),나성수(Na, Sung-Soo),배병찬(Bae, Byung-Chan) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.7
This paper is concerned with the comparison of substructure synthesis methods based on global and local coordinates. The substructure synthesis methods based on the global coordinates were first proposed for the dynamic analysis of complex structure and the substructure synthesis method based on the local coordinates was proposed to solve the dynamic problem of tree-like structure. However, the conceptual difference between two methods in solving the dynamic problem has never been explained. In this paper, a structure consisting of two beams is considered to show the conceptual difference of two methods. The dynamic formulation shows the characteristics and differences of two methods explicitly. The procedure for choosing proper substructure modes in each method is also explained in detail. In addition, the advantage of the substructure synthesis method based on the local coordinate system is discussed based on the numerical example. Numerical examples show how two methods are applied to the addressed problem.
공은호(Kong, Eun-Ho),강부병(Kang, Bu-Byoung),나성수(Na, Sung-Soo) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.2
This study is proposed to develop a numerical interaction model of the magnetically levitated(maglev) train and guideway. For this purpose, equation of motion for 6-DOF vehicle model, EMS, guideway and guideway irregularity are derived as the state-space equation. In order to solve the state space equations, the present work was performed via matlab simulation using Runge-Kutta method. Through the simulation, the effect of dynamic response of maglev system to different vehicle speeds, guideway rigidity(EI) and masses is investigated.
초기 비틀림각이 고려된 블레이드-축 통합 시스템의 동적 특성
이환희(Lee, Hwan-Hee),송지석(Song, Ji-Seok),나성수(Na, Sung-Soo) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.7
A nonlinear dynamic model for the shaft-disk-blade unit is developed in this study. In this regard, the rotating flexible blade, with a pre-twist angle, attached to a rigid disk driven by a shaft which is flexible in torsion is developed. The rotor-blade coupled model is derived using Lagrange equation in conjunction with the assumed mode method to discretize the blade deformation. The equations of motion are analyzed based on the small deformation theory for the blade and shaft torsional deformation to obtain the system natural frequencies for various system parameters.