• Title, Summary, Keyword: 다물체 동역학

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The Efficient Dynamic Modeling of a Manipulator Robot System (제조 공정용 로봇 매니퓰레이터의 효율적 다물체 동역학 해석 모델링 기술 개발)

  • Song, In-Ho;Ryu, Han-Sik;Choi, Jin-Hwan
    • Transactions of the KSME C: Technology and Education
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    • v.3 no.2
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    • pp.155-164
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    • 2015
  • Recently, the robot manipulators are needed more slim size and longer reach and more accurate movement for increasing productivity. So, in this paper, the simulation modeling method and the efficient modeling method for new slim & long reach robot has been investigated for forecasting the slim robot performance before making prototype. To do this investigation, the major parts of robot driving system such as motor, belt and reducer devices and parts assembly method have been investigated mainly. And then, using this developed modeling method the new designed robot will be forecasted about the dynamic performance of new designed robot.

Wind Turbine Simulation Program Development using an Aerodynamics Code and a Multi-Body Dynamics Code (풍력발전시스템의 유연체 다물체 동역학 시뮬레이션 프로그램 개발)

  • Song, Jin-Seop;Rim, Chae-Whan;Nam, Yong-Yun;Bae, Dae-Sung
    • New & Renewable Energy
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    • v.7 no.4
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    • pp.50-57
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    • 2011
  • A wind turbine simulation program for the coupled dynamics of aerodynamics, elasticity, multi-body dynamics and controls of turbine is newly developed by combining an aero-elastic code and a multi-body dynamics code. The aero-elastic code, based on the blade momentum theory and generalized dynamic wake theory, is developed by NREL(National Renewable Energy Laboratory, USA). The multi-body dynamics code is commercial one which is capable of accounting for geometric nonlinearity and twist deflection. A turbulent wind load case is simulated for the NREL 5-MW baseline wind turbine model by the developed program and FAST. As a result, the two results agree well enough to verify the reliability of the developed program.

Recent Trends in Multibody Dynamics Researches reviewed from the papers presented in the Multibody2003 and in the 2003 ASME DETC (Multibody2003와 2003 ASME DETC의 논문들을 통해본 다물체동역학 연구의 세계적 연구추세)

  • Yoo, Wan-Suk
    • Proceedings of the KSME Conference
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    • pp.1714-1717
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    • 2003
  • ECCOMAS Thematic Conference Multibody 2003 was held at IST (Instituto Superior Technico), Lisbon, Portugal from July 1 to July 4. 2003. And MBDV(Multibody Dynamics and Vibration) in the 2003 ASME DETC was held at Chicago, U.S.A. from September 2 to September 6. In this paper, the presented papers in these conferences were reviewed and the trends in the multibody dynamics are summarized. The session titles in these conferences include Flexible Multibody Dynamics, Vehicle Dynamics, Contact, Biomechanics, Real-time Challenges, Spatial manipulator and Control, Multidisciplinary Applications, and Advanced Education. The poster session was also organized for more discussions in the Multibody2003 conference.

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Study on a 2-Dimensional Dynamic Modeling Technique to Analyze the Overriding Phenomena of Rollingstock (열차의 타고오름 해석을 위한 2차원 충돌동역학 모델링 기법 연구)

  • Kim, Geo-Young;Koo, Jeong-Seo;Kwon, Tae-Soo
    • Journal of the Korean Society for Railway
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    • v.14 no.1
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    • pp.11-18
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    • 2011
  • This paper proposed a new 2-D multi-body dynamic modeling technique to analyze overriding behaviors taking place during train collision. This dynamic model is composed of nonlinear springs, dampers and masses by considering the deformable characteristics of carbodies as well as energy absorbing structures and components. By solving this dynamic model for rollingstock, energy absorbing capacities of collision elements, accelerations of passenger sections, impact forces applied to interconnecting devices, and overriding displacements can be well estimated. For a case study, we chose KHST (Korean High Speed Train), obtained crush characteristic data of each carbody section from 3-D finite element analysis, and established a 2-D multi-body dynamic model. This 2-D dynamic model was simulated under the train-to-train collision scenarios, and evaluated with 3-D virtual testing model. It was founded from the simulation results that this 2-D dynamic model could well predict overriding behaviors, and the modeling technique of carbody deformation was very important in overriding estimation.

좌표계 연성에 의한 동력전달계 포함 차량 운동 시뮬레이션 연구

  • 양홍익;정일호;윤지원;박태원;한형석
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.92-92
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    • 2004
  • 최근의 자동차 산업의 발달과 컴퓨터 산업의 발전으로 인해 컴퓨터를 이용한 연구개발이 중요시되고 있다. 때문에 CM (Computer Aided Engineering) 분야는 설계의 비용과 손실을 줄이고 좀 더 경쟁력 있는 제품을 생산하기 위한 방편으로 자리 잡고 있다. 다물체 동역학 해석 분야는 기존의 실험으로는 해석하기 어려웠던 복잡한 자동차의 거동 해석을 가능하게 함으로서 설계에 있어 좋은 방향을 제시하고 있다.(중략)

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An Efficient Solution for Multibody Dynamics Composed of Flexible Beams (유연한 보로 구성된 다물체 동역학의 효율적인 해법)

  • 이기수;금영탁
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.12
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    • pp.2298-2305
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    • 1992
  • To obtain the convenient solution of the multibody dynamic systems composed of flexible beams, linear finite element technique is adopted and the nodal coordinates are interpolated in the global inertia frame. Mass matrix becomes an extremely simple constant matrix and the force vector also becomes extremely simple because Coriolis acceleration and centrifugal force are not required. And the elastic force is also simply computed from the moving frame attached to the material. To solve the global differential algebraic euation. an ODE technique is adopted after Lagrange multiplier is computed by the accelerated iterative technique, and the time demanding procedures such as Newton-Raphson iterations and decomposition of the big matrix are not required. The accuracy of the present solution is checked by a well-known example problem.

Development and Implementation of Real Time Multibody Vehicle Dynamics Model (실시간 다물체 차량 동역학 모델 개발 및 구현)

  • O, Yeong-Seok;Kim, Seong-Su
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.5
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    • pp.834-840
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    • 2001
  • A real time multibody vehicle dynamics model has been developed and implemented using a subsystem synthesis method based on recursive formulation. To verify real time simulation capability the developed model has been applied to HMMWV(High Mobility Multipurpose Wheeled Vehicle) with steering system. For the kinematically driven steering system, the coupled front suspension-steering subsystem can be decoupled into two SLA suspension subsystems, which improves the efficiency of simulation. To investigate theoretical efficiency, operational counting method has been also employed to compare the proposed model with the conventional recursive dynamics model. Various simulations such as unsymmetric bump run, step steering(J-turn) and sine steering input test have been carried out to verify the real time feasibility of the proposed model.

Real-time Dynamic Simulation Using Multibody Vehicle Model (다물체 차량모델을 이용한 실시간 동역학 시뮬레이션)

  • Choe, Gyu-Jae;No, Gi-Han;Yu, Yeong-Myeon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.3
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    • pp.486-494
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    • 2001
  • This paper presents a real-time multibody vehicle dynamic analysis method using recursive Kanes formulation and suspension composite joints. To shorten the computation time of simulation, relative coordinate system is used and the equations of motion are derived using recursive Kanes formulation. Typical suspension systems of vehicles such as MacPherson strut suspension system is modeled by suspension composite joints. The joints are derived and utilized to reduce the computation time of simulation without any degradation of kinematical accuracy of the suspension systems. Using the develop program, a multibody vehicle dynamic model is formed and simulations are performed. Accuracy of the simulation results is compared to the real vehicle field test results. It is found that the simulation results using the proposed method are very accurate and real-time simulation is achieved on a computer with single PowerPC 604 processor.

A Real-time Multibody Vehicle Dynamics and Control Model for a Virtual Reality Intelligent Vehicle Simulator (가상현실 지능형 차량 시뮬레이터를 위한 실시간 다물체 차량 동역학 및 제어모델)

  • 김성수;손병석;송금정;정상윤
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.4
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    • pp.173-179
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    • 2003
  • In this paper, a real-time multibody vehicle dynamics and control model has been developed for a virtual reality intelligent vehicle simulator. The simulator consists of low PCs for a virtual reality visualization system, vehicle dynamics and control analysis system a control loading system, and a network monitoring system. Virtual environment is created by 3D Studio Max graphic tool and OpenGVS real-time rendering library. A real-time vehicle dynamics and control model consists of a control module based on the sliding mode control for adaptive cruise control and a real-time multibody vehicle dynamics module based on the subsystem synthesis method. To verify the real-time capability of the model, cut-in, cut-out simulations have been carried out.