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Investigation and Numerical Analysis of Node Connectors in Free-Form Spatial Structures
황경주,Park, Don-U,Park, Sun-Woo,Knippers, Jan 한국공간구조학회 2007 한국공간구조학회지 Vol.7 No.3
The recent completions of free-form spatial structures provide us a very attractive form. To realize such an extraordinary shape, it is absolutely necessary that the connector systems have to be investigated the characteristics of the systems and analyzed with a practicable method. In this context, this research consists of not only literature research but also numerical analysis with selected connector systems, which was adopted in real free-form spatial structures. For numerical analysis, especially, finite element analysis (FEA) is performed with a various test parameter using a commercial program ANSYS. Consequently, the general characteristics of node connectors the moment-rotation-curves are presented by considering a large deformation effect as well as a multi-linear material properties.
접합부 강성과 비대칭 적설하중 적용을 통한 목조 래티스 지붕 구조물의 좌굴하중 특성
황경주 한국공간구조학회 2023 한국공간구조학회지 Vol.23 No.1
A timber lattice roof, which has around 30m span, was constructed. In order to figure out the realistic buckling load level, the structural analysis of this roof structure was performed especially by stiffness of connection with various asymmetric snow load. Due to the characteristics of application of snow load, the load combinations of snow should be considered not only global area but also local part so that the critical buckling load could be observed as easy as possible. Geometrical imperfection was simulated to consider inaccurate shape of structure. And then nonlinear analysis were performed. Finally, this paper could investigate that the asymmetric snow load with the lower level stiffness of connection decreased the level of buckling load significantly.
Magnetopause Waves Controlling the Dynamics of Earth’s Magnetosphere
황경주 한국우주과학회 2015 Journal of Astronomy and Space Sciences Vol.32 No.1
Earth’s magnetopause separating the fast and often turbulent magnetosheath and the relatively stagnant magnetosphereprovides various forms of free energy that generate low-frequency surface waves. The source mechanism of this energyincludes current-driven kinetic physical processes such as magnetic reconnection on the dayside magnetopause andflux transfer events drifting along the magnetopause, and velocity shear-driven (Kelvin-Helmholtz instability) or density/pressure gradient-driven (Rayleigh-Taylor instability) magnetohydro-dynamics (MHD) instabilities. The solar wind externalperturbations (impulsive transient pressure pulses or quasi-periodic dynamic pressure variations) act as seed fluctuationsfor the magnetopause waves and trigger ULF pulsations inside the magnetosphere via global modes or mode conversion atthe magnetopause. The magnetopause waves thus play an important role in the solar wind-magnetosphere coupling, whichis the key to space weather. This paper presents recent findings regarding the generation of surface waves (e.g., Kelvin-Helmholtz waves) at the Earth’s magnetopause and analytic and observational studies accountable for the linking of themagnetopause waves and inner magnetospheric ULF pulsations, and the impacts of magnetopause waves on the dynamicsof the magnetopause and on the inner magnetosphere.