• Title/Summary/Keyword: 다물체 시스템

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Dynamic Analysis of the Latch Needle of the Circular Knitting Machine (환편기 편직바늘의 동역학해석)

  • Jeong, K.Y.
    • Proceedings of the KSME Conference
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    • 2001.11a
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    • pp.584-589
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    • 2001
  • The latch needle cam system of circular knitting machines is analysed using multibody dynamics. A formulation is made to obtain the vertical stiffness between the needle and the cam. By implementing this formulation into data of the multibody dynamics program, the motion and the force between the needle and the cam are obtained.

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Flexible 효과를 고려한 다물체 시스템의 동역학적 해석에 관한 연구

  • 최승렬;한창수
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1992.10a
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    • pp.349-353
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    • 1992
  • The purpose of this paper is to develop methods for the dynamic analysis of multibody system that consist of interconnected rigid and deformable component. The equations of motion are derived by using the Lagrange's equation and finite element theory for the elastic mechanism systems. The type of equation of motion is the differential algebraic equation included kinematic nonlinear algebraic equation. The generalized coordinate partitioning method is used for solving this equation. To show the validity of this analysis solver, couple of models were canalized and those results were compared with the commercial package(ADAMS).

DESIGN SENSITIVITY ANALYSIS FOR MULTIBODY SYSTEMS (다물체 시스템의 민감도 해석)

  • Lee, Jong-Nyun;Park, Soo-Hong
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.04a
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    • pp.378-382
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    • 1996
  • This paper presents a 'mixed' method for performing the sensitivity analysis for multibody dynamics. The mixed method uses both the analytical derivation and the numerical evaluation, in which premitive derivations rely on the analytical process and their associated individual terms are evaluated by the numerical precess. Therefore, this method can eliminate difficulty in dervation of the direct differentiation. Furthermore, by using the joint coordinate formulation for the equations of motion, compulational efficiencyand numerical accuracy are achieved.

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다물체동역학 시스템의 불확실성 분석 및 설계

  • Yu, Hong-Hui
    • Journal of the KSME
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    • v.54 no.2
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    • pp.41-45
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    • 2014
  • 이 글에서는 조인트, 부싱, 댐퍼 그리고 구동기 등으로 연결된 일반적 다물체계의 질량, 강성, 감쇠, 기하학적 제원 등에 존재하는 불확실성의 영향을 동적 해석 및 설계 시 어떻게 체계적으로 고려해야 하는지 대표적인 방법을 중심으로 관련 내용을 소개하고자 한다.

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Multi-body Dynamic Analysis for the Drivetrain System of a Large Wind Turbine Based on GL 2010 (GL 2010 기반 대형 풍력터빈 드라이브트레인 시스템 다물체 동역학 해석기법)

  • Jeong, Dae-Ha;Kim, Dong-Hyun;Kim, Myung-Hwan
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.24 no.5
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    • pp.363-373
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    • 2014
  • In this study, computational multi-body dynamic analyses for the drivetrain system of a 5 MW class offshore wind turbine have been conducted using efficient equivalent modeling technique based on the design guideline of GL 2010. The present drivetrain system is originally modeled and its related system data is adopted from the NREL 5 MW wind turbine model. Efficient computational method for the drivetrain system dynamics is proposed based on an international guideline for the certification of wind turbine. Structural dynamic behaviors of drivetrain system with blade, hub, shaft, gearbox, supports, brake disk, coupling, and electric generator have been analyzed and the results for natural frequency and equivalent torsional stiffness of the drivetrain system are presented in detail. It is finally shown that the present multi-body dynamic analysis method gives good agreement with the previous results of the 5 MW class wind turbine system.

Development of a Synchronization Test System for a Variable Nozzle (가변노즐의 동기화시험장치 개발)

  • Park, Dong-Chang;Lee, Sang-Youn;Lee, Ju-Young;Yun, Su-Jin;Cho, Sung-Won;Youn, Hyun-Gul
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.04a
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    • pp.130-131
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    • 2011
  • In the present work, a synchronization test system for variable nozzle is described. Variable nozzles are used to enhance the effectiveness of aircraft engines at various altitudes. The synchronization test system was developed to verify the dynamic characteristics and synchronization of variable nozzle mechanism including flaps. The system with a variable nozzle was analyzed, before its fabrication, by a multi-body dynamics analysis software RecurDyn. The newly developed test system is being used to show the synchronization capability of a variable nozzle system.

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A Study on Indirect Adaptive Decentralized Learning Control of the Vertical Multiple Dynamic System (수직다물체시스템의 간접적응형 분산학습제어에 관한 연구)

  • Lee Soo Cheol;Park Seok Sun;Lee Jae Won
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.4
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    • pp.92-98
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    • 2005
  • The learning control develops controllers that learn to improve their performance at executing a given task, based on experience performing this specific task. In a previous work, the authors presented an iterative precision of linear decentralized learning control based on p-integrated learning method for the vertical dynamic multiple systems. This paper develops an indirect decentralized teaming control based on adaptive control method. The original motivation of the teaming control field was loaming in robots doing repetitive tasks such as on an assembly line. This paper starts with decentralized discrete time systems, and progresses to the robot application, modeling the robot as a time varying linear system in the neighborhood of the nominal trajectory, and using the usual robot controllers that are decentralized, treating each link as if it is independent of any coupling with other links. Some techniques will show up in the numerical simulation for vertical dynamic robot. The methods of learning system are shown up for the iterative precision of each link.

Flexible Multibody Dynamic Analysis of the Wiper System for Automotives (자동차 와이퍼 시스템의 유연 다물체 동역학 해석)

  • Jung, Sung-Pil;Park, Tae-Won;Cheong, Won-Sun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.2
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    • pp.175-181
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    • 2010
  • This paper presents the dynamic analysis method for estimating the performance of flat-type blades in wiper systems. The blade has nonlinear characteristics since the rubber is a hyper-elastic material. Thus, modal coordinate and absolute nodal coordinate formulations were used to describe the dynamic characteristic of the blade. The blade was structurally analyzed to find the bending characteristics of the cross section of the blade. According to the analysis results, the blade section is divided into three deformation bodies: rigid, small, and large. For the small deformation body, the modal coordinate formulation is used, while the absolute nodal coordinate formulation is used for the large deformation body. To verify the dynamic analysis result, an experiment was performed. The simulation and experiment results were compared to verify the flexible multi-body dynamic model.

Analysis and Experiment on Dynamic Characteristics for Deployable Composite Reflector Antenna (전개형 복합재료 반사판 안테나의 동특성 분석 및 시험)

  • Chae, Seungho;Roh, Jin-Ho;Lee, Soo-Yong;Jung, Hwa-Young;Lee, Jae-Eun;Park, Sung-Woo
    • Journal of Aerospace System Engineering
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    • v.13 no.5
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    • pp.94-101
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    • 2019
  • The dynamic characteristics of the composite reflector panels are numerically and experimentally investigated. A dynamics model of the panel is analytically developed based on a deployment mechanism of the antenna. The deployment is passively activated using elastic energy of a spring with two rotational degrees of freedom. Using the flexible multi-body dynamic analysis ADAMS, dynamic behavior of the panels such as velocities, deformations, as well as reaction forces during the deployment, are investigated in the gravity and zero-gravity cases. The reflector panel is manufactured using carbon fiber reinforced plastics (CFRPs) and its deployment characteristics are experimentally observed using a zero-gravity deployment test. The impact response and vibration problems that occur during deployment of the antenna panel have been identified and reliably deployed using dampers.