• Title, Summary, Keyword: 다물체 동역학

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Optimization of the Cam Profile of a Vacuum Circuit Breaker by Using Multibody Dynamics Techniques (다물체동역학기법을 이용한 진공 회로차단기의 캠윤곽 최적설계)

  • Jang, Jin-Seok;Sohn, Jeong-Hyun;Yoo, Wan-Suk
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.7
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    • pp.723-728
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    • 2011
  • Since the performance of a vacuum circuit breaker (VCB) mainly depends on the spring operating mechanism, an analysis of the spring operating mechanism is required in order to improve the design of a VCB. In this study, the static stiffness of the spring was determined by using a material testing machine, and the test results were used to model the spring through computer simulation. The multi-body dynamic model of the spring was established by using the RecurDyn program. The dynamic model was verified by comparing the results of stem displacements and rotating angles of the brake shaft obtained from the simulation and from the experiments. After verification of the dynamic model of VCB, the cam profile of the VCB was optimized through multi-body dynamics simulation in order to improve the performance of the closing mechanism.

Multibody Dynamic Simulation and Running Characteristics of DMT Freight (다물체 동역학해석을 이용한 DMT 화차의 주행특성 연구)

  • Lee, Seung-Il;Eom, Beom-Gyu;Lee, Hi-Sung
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.19 no.1
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    • pp.35-41
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    • 2009
  • Through the multibody dynamic simulation, the analysis model of the modalohr freight car of the DMT freight car was developed. By using the developed analysis model, the running dynamic characteristics was inquired through the dynamic analysis about the modalohr freight car. As the running speed and the primary suspension were increased, the lateral and vertical vibration accelerations of the car-body and the bogie were also increased. In case of the lateral vibration acceleration of the car-body, however, review should be considered since it can be influenced by the nonlinear characteristic of the primary suspension. The lateral and vertical vibration of the car-body were generated at the frequency of $2{\sim}3\;Hz$ and $7{\sim}8\;Hz$. And the lateral and vertical vibration of the bogie were generated at the frequency of $25{\sim}35\;Hz$ at the low speed section, $40{\sim}50\;Hz$ at the high speed section.

Mechatronic Analysis for Feeding a Structure of a Machine Tool Using Multi-body Dynamics (다물체 동역학을 활용한 공작기계 구조물 이송을 위한 메카트로닉 해석)

  • Choi, Jin-Woo
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.21 no.5
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    • pp.691-696
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    • 2012
  • In this study, a rigid multi-body dynamic model has been developed for mechatronic analysis to evaluate dynamic behavior of a machine tool. The development environment was the commercialized analysis tool, ADAMS, for rigid multi-body dynamic analysis. A simplified servo control logic was implemented in the tool using its functions in order to negate any external tool of control definition. The advantage of the internal implementation includes convenience of the analysis process by saving time and efforts. Application of this development to a machine tool helps to evaluate its dynamic behavior against feeding its component, to calculate the motor torque, and to optimize parameters of the control logic.

Gun System Vibration Analysis using Flexible Multibody Dynamics (유연 다물체 동역학을 이용한 포신-포탑시스템의 진동해석)

  • 김성수;유진영
    • Journal of KSNVE
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    • v.8 no.1
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    • pp.203-211
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    • 1998
  • In order to find out relationship between hit probability and gun firing of a moving tank, a turret and flexible gun system model has been developed using a recursive flexible multibody dynamics. For a firing simulation model, nodal coordinates for a finite element model of a flexible gun have been employed to include transverse loads to the gun tube due to moving bullet and ballistic pressure. Modal coordinates are also used to represent the motion induced gun vibration before a firing occurs. An efficient switching technique from modal equations to nodal equation has been introduced for an entire gun firing simulation with a rotating turret.

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Multi-flexible Body Dynamic Analysis of a Heavy Trailer Vehicle Passing a Bump (대형 트레일러 차량의 범프 통과 시 유연다물체 동역학 해석)

  • Kim, J.Y.;Kim, H.S.;Kim, J.G.
    • Journal of Power System Engineering
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    • v.13 no.5
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    • pp.40-45
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    • 2009
  • This article deals with the transient analysis using multi-flexible body dynamics of a trailer vehicle, which is passing a bump on the flat road. In order to investigate the transient dynamic behavior of the trailer, we developed an equivalent finite element model for the trailer and a vehicle dynamic model for the truck using multi-body dynamics. The driving condition considered here is set as the trailer vehicle passes a bump on the flat road in 7km/h. And we investigate the time histories of vertical load and deflections on connecting points between the trailer and truck during the vehicle passes a bump. Due to the dynamic load resulted from the driving condition, additional stress concentrations are found in the trailer and the suspension connecting points between the trailer and rear axles along with kingpin.

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Modeling of the Maglev Vehicle Running over the Elevated Guideway Using Flexible Multibody Dynamics (유연다물체 동역학을 이용한 자기부상열차 동역학 모델링 연구)

  • Lee, Jong-Min;Kim, Young-Joong;Kim, Kuk-Jin;Kim, Dong-Sung;Kim, Sook-Hee;Han, Hyung-Suk
    • Journal of the Korean Society for Railway
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    • v.9 no.6
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    • pp.792-797
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    • 2006
  • In general, the Maglev vehicle is ran over the elevated guideway consisted of steel or concrete structure. Since the running behaviour of the vehicle is affected by the flexibility of the guideway, the consideration of the flexibility of guideway is needed for evaluation of dynamics of both the vehicle and guideway. A new technique based on flexible multibody dynamics is proposed to model the Maglev vehicle, levitation controller, and guideway into a coupled model. To verify the technique, an urban Maglev vehicle is analyzed using the technique and discussions are carried out.

A Study on the Efficient Flexible Multibody Dynamics Modeling of Deep Seabed Integrated Mining System with Subsystem Synthesis Method (부분시스템 합성방법을 이용한 심해저 통합 채광시스템의 효율적인 유연 다물체 동역학 모델링 연구)

  • Yun, Hong-Seon;Kim, Sung-Soo;Lee, Chang Ho;Kim, Hyung-Woo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.12
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    • pp.1213-1220
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    • 2015
  • A deep seabed integrated mining system consists of a mining vessel, a lifting pipe, a buffer station, a flexible pipe, and a mining robot for collecting manganese nodules. Recently, the concept of multiple mining robots was introduced to enhance to mining productivity. In this paper, the subsystem synthesis method was applied to the deep seabed integrated mining system in order to improve the efficiency of system analysis and to facilitate its extension to the system of multiple mining robots. Large deflections of the lifting and flexible pipe were considered by dividing a flexible pipe into several substructures, and applying flexible multibody dynamics to each substructure. Theoretical study has been carried out for the efficiency of the subsystem synthesis method for the integrated mining system, by comparing the arithmetic operational counts of the subsystem synthesis method with those of the conventional method.

Flexible Multibody Dynamic Analysis of the Deployable Composite Reflector Antenna (전개형 복합재 반사판 안테나의 유연 다물체 동역학 해석)

  • Lim, Yoon-Ji;Oh, Young-Eun;Roh, Jin-Ho;Lee, Soo-Yong;Jung, Hwa-Young;Lee, Jae-Eun;Kang, Deok-Soo;Yun, Ji-Hyeon
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.47 no.10
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    • pp.705-711
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    • 2019
  • Dynamic behaviors of the deployable composite reflector antenna are numerically and experimentally investigated. Equations of the motion are formalized using Kane's equation by considering multibody systems with two degrees of freedom such as folding and twisting angles. To interpret structural deformations of the reflector antenna, the composite reflector is modeled using a beam model with the FSDT(First-order Shear Deformation Theory). To determine design parameters such as a torsional spring stiffness and a damping coefficient depending on deployment duration, an inverted pendulum model is simply applied. Based on the determined parameters, dynamic characteristics of the deployable reflector are investigated. In addition, its results are verified and compared through deployment tests using a gravity compensation device.

Study on Parallel Processing for Efficient Flexible Multibody Analysis based on Subsystem Synthesis Method (병렬 처리를 이용한 부분 시스템 기반 유연다물체 동역학의 효율적인 해석 연구)

  • Han, Jong-Boo;Song, Hajun;Kim, Sung-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.41 no.6
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    • pp.507-515
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    • 2017
  • Flexible multibody simulations are widely used in the industry to design mechanical systems. In flexible multibody dynamics, deformation coordinates are described either relatively in the body reference frame that is floating in the space or in the inertial reference frame. Moreover, these deformation coordinates are generated based on the discretization of the body according to the finite element approach. Therefore, the formulation of the flexible multibody system always deals with a huge number of degrees of freedom and the numerical solution methods require a substantial amount of computational time. Parallel computational methods are a solution for efficient computation. However, most of the parallel computational methods are focused on the efficient solution of large-sized linear equations. For multibody analysis, we need to develop an efficient formulation that could be suitable for parallel computation. In this paper, we developed a subsystem synthesis method for a flexible multibody system and proposed efficient parallel computational schemes based on the OpenMP API in order to achieve efficient computation. Simulations of a rotating blade system, which consists of three identical blades, were carried out with two different parallel computational schemes. Actual CPU times were measured to investigate the efficiency of the proposed parallel schemes.