• Title, Summary, Keyword: 다물체 동역학

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Analysis Method for Multi-Flexible-Body Dynamics Solver in RecurDyn (RecurDyn 솔버에 적용되어 있는 유연 다물체 동역학에 대한 해석기술)

  • Choi, Juhwan;Choi, Jin Hwan
    • Transactions of the KSME C: Technology and Innovation
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    • v.3 no.2
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    • pp.107-115
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    • 2015
  • The analysis of multi-flexible-body dynamics (MFBD) has been an important issue in the area of the computational dynamics. This technique has been developed and improved in RecurDyn solver. This paper reviews the formulation which is applied in the RecurDyn solver. Basically, in order to solve the multi-flexible-body dynamics problem, an incremental finite element formulation using a corotational procedure is used. In particular, in order to solve the rigid and flexible bodies together, a constraint equation between a rigid body and a flexible body is applied, in which a virtual body and a flexible body joint are introduced.

Calculation of Critical Speed of Railway Vehicle by Multibody Dynamics Analysis (다물체 동역학 해석방법을 이용한 철도차량의 임계속도 계산)

  • Kang, Juseok
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.11
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    • pp.1371-1377
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    • 2013
  • In this analysis, a method is presented to calculate the critical speed of a railway vehicle by using a multibody dynamic model. The contact conditions and contact forces between the wheel and the rail are formularized for the wheelset model. This is combined with the bogie model to obtain a multibody dynamic model of a railway vehicle with constraint conditions. First-order linear dynamic equations with independent coordinates are derived from the constraint equations and dynamic equations of railway vehicles using the QR decomposition method. Critical speeds are calculated for the wheelset and bogie dynamic models through an eigenvalue analysis. The influences of the design parameters on the critical speed are presented.

반디호 복합재 착륙장치의 착륙특성에 관한 해석

  • Choi, Sun-Woo;Park, Il-Kyung
    • Aerospace Engineering and Technology
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    • v.4 no.2
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    • pp.15-20
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    • 2005
  • Most of studies for the ground load and ground behavior of landing gear have been conducted with an assumption that the structure of landing gear was rigid body. The assumption of rigid body during design process results in many errors or discrepancy. High ground load occurs in 3 directions on the shock absorbing strut during landing. This ground load initiated high structural deformation. In this study, the flex-multi-body dynamics is applied to adapt flexible bodies, so the results of analysis can be described close to landing gears real behaviour.

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Co-simulation of MultiBody Dynamics and Plenteous Sphere of Contacted Particles Using NVIDIA GPGPU (NVIDIA 의 GPGPU 를 이용한 수 많은 구형 접촉 입자가 포함된 다물체 동역학 해석)

  • Park, Ji-Soo;Yoon, Joon-Shik;Choi, Jin-Hwan;Rhim, Sung-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.4
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    • pp.465-474
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    • 2012
  • In this study, a dynamic simulation model that considers many spherical particles and multibody dynamics (MBD) entities is developed. Plenteous spherical particles are solved using the Discrete Element Method (DEM) technique and simulated on a GPU board in a PC. A fast algorithm is used to calculate the Hertzian contact forces between many spherical particles, and NVIDIA CUDA is used to increase the calculation speed. The explicit integration method is applied to solve the many spheres. MBD entities are simulated by recursive formulation. Constraints are reduced by recursive formulation, and the implicit generalized alpha method is applied to solve the dynamic model. A new algorithm is developed to simulate the DEM and MBD models simultaneously. As a numerical example, a truck car model and gear model are developed. The results show that the proposed algorithm using a general-purpose GPU in a PC has many advantages.

Biomechanical Analysis and Evaluation Technology Using Human Multi-Body Dynamic Model (인체 다물체 동역학 모델을 이용한 생체역학 분석 및 평가 기술)

  • Kim, Yoon-Hyuk;Shin, June-Ho;Khurelbaatar, Tsolmonbaatar
    • Journal of the Korean Society for Nondestructive Testing
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    • v.31 no.5
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    • pp.494-499
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    • 2011
  • This paper presents the biomechanical analysis and evaluation technology of musculoskeletal system by multi-body human dynamic model and 3-D motion capture data. First, medical image based geometric model and material properties of tissue were used to develop the human dynamic model and 3-D motion capture data based motion analysis techniques were develop to quantify the in-vivo joint kinematics, joint moment, joint force, and muscle force. Walking and push-up motion was investigated using the developed model. The present model and technologies would be useful to apply the biomechanical analysis and evaluation of human activities.

다물체 동역학과 베어링의 윤활 해석을 연계한 다중 물리시스템 해석 기법

  • Lee, Jeong-Hui;Kim, Chang-Wan
    • Journal of the KSME
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    • v.49 no.6
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    • pp.30-33
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    • 2009
  • 최근 다물체 동역학과 다른 물리계에 대한 연성 해석이 활발히 추진되고 있다. 이 글에서는 다물체 동역학을 이용한 윤활 해석을 위한 EHD(Elasto-Hydrodynamic Lubrication) 해석 사례를 소개함으로써 베어링 동역학을 기반으로 베어링 해석을 이해하고자 한다.

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Development of Multi-Body Dynamics Simulator for Bio-Mimetic Motion in Lizard Robot Design (도마뱀 로봇 설계를 위한 생체운동 모사 다물체 동역학 시뮬레이터 개발)

  • Park, Yong-Ik;Seo, Bong Cheol;Kim, Sung-Soo;Shin, Hocheol
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.6
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    • pp.585-592
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    • 2014
  • In this study, a multibody simulator was developed to analyze the bio-mimetic motion of a lizard robot design. A RecurDyn multibody dynamics model of a lizard was created using a micro-computerized tomography scan and motion capture data. The bio-mimetic motion simulator consisted of a trajectory generator, an inverse kinematics module, and an inverse dynamics module, which were used for various walking motion analyses of the developed lizard model. The trajectory generation module produces spinal movements and gait trajectories based on the lizard's speed. Using the joint angle history from an inverse kinematic analysis, an inverse dynamic analysis can be carried out, and the required joint torques can be obtained for the lizard robot design. In order to investigate the effectiveness of the developed simulator, the required joint torques of the model were calculated using the simulator.

Dynamic Analysis of Wave Energy Generation System by Using Multibody Dynamics (다물체 동역학을 이용한 파력발전기의 동적거동 분석)

  • Jang, Jin-Seok;Sohn, Jeong-Hyun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.12
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    • pp.1579-1584
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    • 2011
  • This paper discusses an energy system that can convert wave energy into electrical energy. This wave energy generation system is movable and has 12 arms and one generator. A multibody dynamic model for this system is established by using kinematic constraints. A gear mechanism, several kinematic constraints, and force elements are included in the model. Wave forces are obtained numerically from the time domain formulation based on the Morison equation. The MSC/ADAMS program is employed to carry out dynamic analysis of the wave energy generation system. The dynamic behavior responses of this system are analyzed for design verification. According to the results of the dynamic analysis, the yaw motion is relatively stable and kinetic energy sufficient to generate electrical energy is obtained when the wave height exceeds 1m.

Rigid Body Dynamic Analysis on the Spent Nuclear Fuel Disposal Canister under Accidental Drop and Impact to the Ground: Theory (사고로 지면으로 추락낙하 충돌하는 고준위폐기물 처분용기에 대한 기구동역학 해석: 이론)

  • Kwon, Young-Joo
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.26 no.5
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    • pp.359-371
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    • 2013
  • This paper is the first paper among two papers which constitute the paper about the rigid body dynamic analysis on the spent nuclear disposal canister under accidental drop and impact on to the ground. This paper performed the general theoretical study on the rigid body dynamic analysis. Through this study the impulsive force which is occurring in the spent nuclear fuel disposal canister under accidental drop and impact to the ground and required for the structural safety design of the canister is intended to be theoretically formulated. The main content of the theoretical study is about the equation of motion in the multibody dynamics. On the basis of this study the impulsive force which is occurring in the multibody in the case of collision between multibody is theoretically formulated. The application of this theoretically formulated impulsive force to computing the impulsive force occurring in the spent nuclear fuel disposal canister under accidental drop and impact to the ground is investigated.