• Title/Summary/Keyword: Coupling equations

Search Result 426, Processing Time 0.044 seconds

Design Equation of a Coupled Beam to Limit Deflection of Modular Unit Structures (모듈러 유닛 구조물의 사용성 향상을 위해 연결된 보의 처짐 제한을 위한 설계식 개발)

  • Park, Ji-Hun;An, Seok-Hyun;Cho, Bong-Ho;Lee, Sang-Hyun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2007.11a
    • /
    • pp.471-475
    • /
    • 2007
  • Design equations of coupling plates, which connects floor beam of the upper modular unit and overhead beam of the lower one in order to improve serviceability in vibration, are proposed. End conditions of the coupled beams is semi-rigid and the optimal location of the coupling plates are assumed. Rotational constraints for both ends of the coupling plate modeled with beam elements are released and flexibility method is applied to obtain deflection equations of the coupled beam. Proposed equations are defined using the flexibility of the coupling plate, of which size can be determined inversely. Based on numerical analysis, coefficients of the design equations are calibrated and the revised equations are verified to be useful in the design of the coupled beam.

  • PDF

The Steel Coupling Beam-Wall Connections Strength

  • Park, Wan-Shin;Yun, Hyun-Do
    • Journal of the Korea Concrete Institute
    • /
    • v.18 no.1 s.91
    • /
    • pp.135-145
    • /
    • 2006
  • In high multistory reinforced concrete buildings, coupled shear walls can provide an efficient structural system to resist horizontal force due to wind and seismic effects. Coupled shear walls are usually built over the whole height of the building and re laid out either as a series of walls coupled by beams and/or slabs or a central core structure with openings to accommodate doors, elevators walls, windows and corridors. A number of recent studies have focused on examining the seismic response of concrete, steel, and composite coupling beams. However, since no specific equations are available for computing the bearing strength of steel coupling beam-wall connections, it is necessary to develop such strength equations. There were carried out analytical and experimental studies to develop the strength equations of steel coupling beam-connections. Experiments were conducted to determine the factors influencing the bearing strength of the steel coupling beam-wall connection. The results of the proposed equations were in good agreement with both test results and other test data from the literature. Finally, this paper provides background for design guidelines that include a design model to calculate the bearing strength of steel coupling beam-wall connections.

COMPARISON OF COUPLING METHODS FOR NAVIER-STOKES EQUATIONS AND TURBULENCE MODEL EQUATIONS (Navier-Stokes 방정식과 난류모델 방정식의 연계방법 비교)

  • Lee, Seung-Soo;Ryu, Se-Hyun
    • 한국전산유체공학회:학술대회논문집
    • /
    • 2005.10a
    • /
    • pp.111-116
    • /
    • 2005
  • Two coupling methods for the Navier-Stokes equations and a two-equation turbulence model equations are compared. They are the strongly coupled method and the loosely coupled method. The strongly coupled method solves the Navier-Stokes equations and the two-equation turbulence model equations simultaneously, while the loosely coupled method solves the Navier-Stokes equation with the turbulence viscosity fixed and subsequently solves the turbulence model equations with all the flow quantities fixed. In this paper, performances of two coupling methods are compared for two and three-dimensional problems.

  • PDF

Dynamic Analysis of Spindle System with Magnetic Coupling(ll) (마그네틱 커플링을 장착한 축계의 동적해석(II))

  • Kim, S.G.;Lee, J.M.
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.12 no.7
    • /
    • pp.107-113
    • /
    • 1995
  • Using the mathematical model of the torsional vibration in spindle system with magnetic coupling, which was proposed in the paper of dynamic analysis of spindle system with magnetic coupling(l), we derive the equations of the motion and the form of the derived equations represents Duffing equation. Numerical analyses are executed in many conditions, namely the various types in magnetic coupling, changes of the gap between driver and follower. To verify the results of the therorectical analyses, a precision dynamic drive system is manufactured and methods of the test to measure the torsional vibration of the spindle system with magnetic coupling are presented ad thests in various conditions are carried out.

  • PDF

Multidimensional Frictional Coupling Effect in the Photoisomerization of trans-Stilbene

  • Gwak, Gi Jeong;Lee, Sang Yeop;Sin, Guk Jo
    • Bulletin of the Korean Chemical Society
    • /
    • v.16 no.5
    • /
    • pp.427-432
    • /
    • 1995
  • A model based on two coupled generalized Langevin equations is proposed to investigate the trans-stilbene photoisomerization dynamics. In this model, a system which has two independent coordinates is considered and these two system coordinates are coupled to the same harmonic bath. The direct coupling between the system coordinates is assumed negligible and these two coordinates influence each other through the frictional coupling mediated by solvent molecules. From the Hamiltonian which is equivalent to the coupled generalized Langevin equations, we obtain the transition state theory rate constants of the stilbene photoisomerization. The rates obtained from this model are compared to experimental results in n-alkane solvents.

The Equations of Motion for the Stretcthing, Bending and Twisting of a Marine Pipeline Containing Flowing Fluids (내부 유체 유동을 포함한 해저 파이프 라인의 인장 굽힘 비틀림 운동 방정식)

  • 서영태
    • Journal of Ocean Engineering and Technology
    • /
    • v.8 no.2
    • /
    • pp.151-156
    • /
    • 1994
  • The equations of motion of a submarine pipeline with the internal flowing fluid and subject to hydrodynamic loadings are derived by using Hamilton's principle. Coupling between the bending and the longitudinal extension due to axial load and thermal expansion are considered. Coupling between the twisting and extension are not considered. The equations of motion are well agreed with the results which are derived by the vector method.

  • PDF

The Bearing Strength of Connections Between Steel Coupling Beam and Reinforced Concrete Shear Walls

  • Yun, Hyun Do;Park, Wan Shin;Han, Min Ki;Kim, Sun Woo;Kim, Yong Chul;Hwang, Sun Kyung
    • Architectural research
    • /
    • v.7 no.1
    • /
    • pp.27-38
    • /
    • 2005
  • No specific guidelines are available for computing the bearing strength of connection between steel coupling beam and reinforced concrete shear wall in a hybrid wall system. There were carried out analytical and experimental studies on connection between steel coupling beam and concrete shear wall in a hybrid wall system. The bearing stress at failure in the concrete below the embedded steel coupling beam section is related to the concrete compressive strength and the ratio of the width of the embedded steel coupling beam section to the thickness of the shear walls. Experiments were carried out to determine the factors influencing the bearing strength of the connection between steel coupling beam and reinforced concrete shear wall. The test variables included the reinforcement details that confer a ductile behavior in connection between steel coupling beam and shear wall, i.e., the auxiliary stud bolts attached to the steel beam flanges and the transverse ties at the top and the bottom steel beam flanges. In addition, additional test were conducted to verify the strength equations of the connection between steel coupling beam and reinforced concrete shear wall. The proposed equations in this study were in good agreement with both our test results and other test data from the literature.

A Study on the Determination of Mode Coupling Coefficient in Graded-Index Optical Fiber (Graded Index 광섬유의 Mode Coupling Coefficient 결정에 관한 연구)

  • 이호준;김병찬
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.13 no.2
    • /
    • pp.149-159
    • /
    • 1988
  • In this paper, the Fourier Transform is employed to solve the coupled differential equations of modal power and three equations of the mode coupling coeficient are dierived using the phasor form trial soluation. The theory of the mode coupling coefficient contains a few theories proposed by earlier authers. Also it is seen that in case the optical source is modulated by a sinusoidal function, this theory is applied as well. In experiment, the mode coupling coefficient is determinded for a multimode graded-index fiber by using the optical source, which modulated by a sinusoidal function.

  • PDF

A study on the coupling of electromagnetic field to transmission lines (외부전자파와 전송선로 결합해석 연구)

  • Myung, Sung-Ho;Lee, Ki-Chul
    • Proceedings of the KIEE Conference
    • /
    • 1988.11a
    • /
    • pp.302-305
    • /
    • 1988
  • In this paper, the coupling of external electromagnetic fields to transmission lines is studied. The emphasis is on the practical solution of Problems involving the excitation of currents on the wires by natural and man-made sources of electromagnetic fields, First, this study develops the theory of excitation of a two-wire transmission line illuminated by electromagnetic field the coupling equations are solutions of differential equations which include the source terms due to the incident fields. And equations in this paper reduce to simple forms when the incident field is a plane wave.

  • PDF

Stochastic space vibration analysis of a train-bridge coupling system

  • Li, Xiaozhen;Zhu, Yan
    • Interaction and multiscale mechanics
    • /
    • v.3 no.4
    • /
    • pp.333-342
    • /
    • 2010
  • The Pseudo-Excitation Method (PEM) is applied to study the stochastic space vibration responses of train-bridge coupling system. Each vehicle is modeled as a four-wheel mass-spring-damper system with two layers of suspension system possessing 15 degrees-of- freedom. The bridge is modeled as a spatial beam element, and the track irregularity is assumed to be a uniform random process. The motion equations of the vehicle system are established based on the d'Alembertian principle, and the motion equations of the bridge system are established based on the Hamilton variational principle. Separate iteration is applied in the solution of equations. Comparisons with the Monte Carlo simulations show the effectiveness and satisfactory accuracy of the proposed method. The PSD of the 3-span simply-supported girder bridge responses, vehicle responses and wheel/rail forces are obtained. Based on the $3{\sigma}$ rule for Gaussian stochastic processes, the maximum responses of the coupling system are suggested.