• Title/Summary/Keyword: Force equilibrium

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Form-finding of Tensegrity Structures with constraints by using Force Method (하중법을 이용한 텐세그리티 구조물의 자기평형 응력 탐색)

  • Chung, Woo-Sung;Lee, Jae-Hong;Kang, Joo-Won
    • Journal of Korean Association for Spatial Structures
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    • v.11 no.4
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    • pp.49-59
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    • 2011
  • This paper presents a new numerical method by using Singular Value Decomposition force method for form-finding of tensegrity structures with constraints. In order to maintain the tensegrity structures stable, state of self-equilibrium stress should be introduced. The existing force method has some advantages about form-finding of tensegrity structures. However, this method has complex formulation. In force density method, dummy members are required for form -finding of tensegrity structures with constraints. Therefore this study proposes new force method using Singular value decomposition. The proposed method is both having easy basic consept and simple computation than existing force method. A numerical example is presented to demonstrate the efficiency and robustness in searching initial single integral feasible self-stress mode for tensegrity structures with constraints.

Calculation of equivalent friction coefficients in V-belt (V벨트에서 상당마찰계수 계산)

  • Hong, J.P.
    • Proceedings of the KSME Conference
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    • 2001.11a
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    • pp.740-745
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    • 2001
  • There are two kinds of method to calculate the equivalent friction coefficients at V groove. One is to consider the firction in radial direction. The other is to neglect the friection in radial direction. The values calculated from the two methods is different of which ratio is in the range from two times to five times. So it is necessary to study which is correct in the view of force equilibrium and machine design.

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A Form-finding of Planar Tensegrity Structures

  • Lee, Sang Jin
    • Architectural research
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    • v.14 no.4
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    • pp.143-152
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    • 2012
  • A form-finding procedure is presented for planar tensegrity structures. Notably, a simple decision criteria is proposed to select the desirable candidate position vector from the unitary matrix produced by the eigenvalue decomposition of force density matrix. The soundness of the candidate position vector guarantees faster convergence and produces a desirable form of tensegrity without any member having zero-length. Several numerical examples are provided to demonstrate the capability of the proposed form-finding process.

Behavior Prediction of Strengthened! Reinforced! Concrete Beam using Nonlinear Analysis (비선형 해석을 통한 보강된 RC 보의 거동 예측)

  • 박중열;황선일;조홍동;한상훈
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.561-566
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    • 2003
  • In this study, to predict the behavior of RC beam strengthened with Carbon fiber reinforced polymer(CFRP) plate, analytical program considering material non-linearity is developed. Strain compatibility and force equilibrium are applied and internal forces of constitutive material are calculated using nonlinear stress-strain relationship. Also, to certainty the reliability of analytical program, deflection, strain of CFRP plate, change of neutral axis on cross section and crack distribution at failure are compared with those of experiment, and each results are almost coincident.

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A Study on the Snake Motion of a Machine Tool Cross-Head Moving with Dry Friction on LM Guides (LM 가이드 상에서 건마찰 접촉을 하면서 운동하는 Cross Head의 사행동에 관한 연구)

  • 최영휴
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.04a
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    • pp.708-713
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    • 2000
  • This paper reviews the concepts of the snake motion which can be often observed on the bodies moving along guide rails. A simple modelling is proposed in order to analyze the snake motion of the cross head assembly and force and moment equilibrium equations are established. It is determined the critical conditions at which snake motion just brings about. Some possible methods to reduce or prevent snake motion are discussed in detail.

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Magnetic Levitation System of High Tc Superconductor (초전도 자기부상 시스템)

  • Lee, Sang-Heon
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.55 no.4
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    • pp.213-216
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    • 2006
  • The magnetic levitation effect a high Tc superconductor beneath the toroidal permanent magnet was examined by means of a improved magnetic seesaw method. Magnetic effects associated with penetration and pinning in superconductor. One of these was focussing of magnetic field by superconductor and the other was magnetic levitation. The existence of equilibrium was shown to be related to hysteresis observed in the force separation for a toroidal permanent magnet and superconductor. Obtained results indicate that magnetic levitation effect in the present case was mainly due to diamagnetic effect.

Mechanics of orthogonal regression (직교 회귀의 역학적 고찰)

  • 채경철
    • The Korean Journal of Applied Statistics
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    • v.3 no.1
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    • pp.47-58
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    • 1990
  • Orthogonal regression is reviving due to the current development of software to control robotized coordinate measuring machines. Known features of orthogonal regression are summarized and geometry of the problem is interpreted in terms of equilibrium of force. A class example is given.

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Perturbed Finite Element Analysis of Fold Bifurcations in Load/unload Bard Disk Drive Systems (Load/Unload 하드디스크 드라이브 시스템에의 Fold Bifurcations의 교란 유한요소 해석)

  • Hwang Pyung;Khan Polina V.
    • 정보저장시스템학회:학술대회논문집
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    • 2005.10a
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    • pp.177-178
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    • 2005
  • The load/unload behavior of the hard disk drive slider is studied in terms of the air bearing static characteristics. The numerical continuation methods are applied to calculate suspension force - equilibrium position curve. The critical preloads of the femto size slider are analyzed. The hi-stability conditions are depicted on the skew angle - preload diagram. The perturbation method is used to check the stability of the solution branches.

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Electric Charge and Magnetic Flux on Astrophysical Black Hole

  • LEE HYUN KYU
    • Journal of The Korean Astronomical Society
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    • v.34 no.4
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    • pp.301-303
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    • 2001
  • We suggest a possible scenario of an astrophysical black hole with non-vanishing electric charge and magnetic flux. The equilibrium charge on a rotating black hole in a force-free magnetosphere is calculated to be Q $\~$ BJ with a horizon flux of ${\~}BM^2$, which is not large enough to disturb the background Kerr geometry. Being similar to the electric charge of a magnetar, in sign and order of magnitude, both electric charge and magnetic flux are supposed to be continuous onto a black hole.

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Modeling and simulation of partially delaminated composite beams

  • Mahieddine, A.;Ouali, M.;Mazouz, A.
    • Steel and Composite Structures
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    • v.18 no.5
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    • pp.1119-1127
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    • 2015
  • A finite-element model for beams with partially delaminated layers is used to investigate their behavior. In this formulation account is taken of lateral strains and the first-order shear deformation theory is used. Both displacement continuity and force equilibrium conditions are imposed between the regions with and without delamination. Numerical results of the present model are presented and its performance is evaluated for static and dynamic problems.