• Title/Summary/Keyword: 강체동역학해석

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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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A Three Dimensional Wheelset Dynamic Analysis considering Wheel-rail Two Point Contact (차륜-레일 2점 접촉을 고려한 3차원 윤축 동역학 해석)

  • Kang, Ju-Seok
    • Journal of the Korean Society for Railway
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    • v.15 no.1
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    • pp.1-8
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    • 2012
  • Wheelset dynamic analysis is a key element to determine the degree of accuracy of railway vehicle dynamics. In this study, a three-dimensional wheelset dynamic analysis is presented in such a way that the precise wheel-rail contact analysis in three-dimension is implemented into the dynamic equations of a wheelset. A numerical procedure that can be used for the analysis of a wheelset dynamics when the wheel-rail two point contact occurs in a cornering maneuver is developed. Numerical solutions of the constraint equations and the dynamics equations of a wheelset are achieved by using Runge-Kutta method. The proposed wheelset dynamic analysis is validated by comparison against results obtained from VI-RAIL analysis.

Development of a Dynamic Simulation Program Including a Wheel-Rail Contact Module (휠-레일 접촉모듈을 포함한 동역학 해석 프로그램 개발)

  • Cho, Jae-Ik;Park, Tae-Won;Yoon, Ji-Won;Lee, Soo-Ho;Jung, Sung-Pil
    • Journal of the Korean Society for Railway
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    • v.13 no.1
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    • pp.16-22
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    • 2010
  • Various programs for dynamic simulation of the railway vehicle have advantages and disadvantages. These programs have limitation that cannot express a large deformable body for an wire of the railway vehicle. In this study, a program for dynamic simulation of the railway vehicle is developed. And the rigid, flexible and large deformable body can be simulated using this program. Its reliability is verified by comparison with a commercial program. Also, a wire is considered as the large deformable body and a sliding joint which connects the rigid body to the large deformable body is included. Moreover, as the wheel-rail contact module is added, the dynamic simulation of the railway vehicle can be analyzed using the developed program.

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 Education
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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.

Analysis for the Driving Dynamic Characteristics of Large Scale Semi-Trailer Equipped with Swivel Axle and Hydropneumatic Suspension Unit (회전 차축 및 유기압 현가장치를 장착한 대용량 세미 트레일러의 주행 동특성 해석)

  • Ha, Taewan;Park, Jungsoo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.25 no.2
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    • pp.196-209
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    • 2022
  • Driving dynamic characteristics of semi-trailer loaded with precise equipments are very important to protect them from vibration, impact or other disturbances. In this paper, in order to identify the driving dynamic characteristics of the large scale semi-trailer equipped with swivel axle and hydropneumatic suspension unit, Dynamics Modeling & Simulation(M&S) were performed using general Dynamics Analysis Program(RecurDyn V9R2). The semi-trailer was modeled as two types - one is Multi Rigid Body Dynamics(MRBD) model, and the other Rigid-Flexible Body Dynamics(RFlex) one. The natural vibration mode and frequencies of semi-trailer body, acceleration of dummy-weight, pitch, roll and yaw of dummy-weight, swivel axle and hydropneumatic suspension cylinder support structure, and acting force of hydropneumatic suspensions etc. were obtained from the M&S. Additionally frequency analysis were performed using the data of behavior obtained from above M&S. Generally the quantitative results of RFlex are larger than them of MRBD in view of magnitude of the comparable parametric values.

Dynamic analysis of railway vehicle by using track coordinates (트랙 좌표계를 이용한 철도차량 운동 해석)

  • Kang, Ju-Seok
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.818-823
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    • 2011
  • 6-generalized coordinates of absolute translational displacements and angular displacements measured at Cartesian coordinates system fixed at the ground has been used to describe general dynamic behavior of a rigid body in mechanical systems. However, track coordinates system moving with the centerline of the track can be used to develop dynamic formulations for railway vehicle. It is easy to impose the constraints of track coordinates by the virtue of track coordinates system moving with track centerline. In this analysis, dynamic equations of railway vehicle by using track coordinates system is derived and the simulation results are presented.

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Bearing Performance Evaluation Based on Rigid Body Dynamic Analysis Considering Rotation and Loads Over Time (시간에 따른 회전 및 하중을 고려한 강체 동역학 해석에 기반한 베어링 성능 평가)

  • Seungpyo Lee
    • Tribology and Lubricants
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    • v.39 no.2
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    • pp.35-42
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    • 2023
  • Bearing is a mechanical component that supports loads and transmits rotation. As the application of high-value-added products such as semiconductors, aviation, and robots have recently become diverse and more precise, an accurate bearing performance prediction and evaluation technology is required. Bearing performance evaluation can be divided into evaluations based on bearing theory and on numerical analysis. An evaluation based on numerical analysis is a technique that has been highlighted because the problems that remained unsolved owing to time problems can be solved through recent developments in computers. However, current studies have the disadvantage of not considering the essential changes over time and bearing rotation. In this study, bearing performance evaluation based on rigid body dynamic analysis considering rotation and load over time is performed. Rigid body dynamic analysis is performed for deep groove ball bearing to calculate the load applied by the ball. The reliability of the analysis is verified by comparing it with the results calculated using bearing theory. In addition, rigid body dynamic analysis is performed for automotive wheel bearings to calculate the contact angle and load applied by the ball for cases where axial load and radial load are applied, respectively. The effect of rotation and load over time is evaluated from these results.

Estimation on Heavy Handling Robot using Flexible-Rigid Multibody Analysis (변형체-강체 다물체 해석을 이용한 초중량물 핸들링로봇의 평가)

  • Kim, Jin-Kwang;Ko, Hae-Ju;Park, Ki-Beom;Kim, Tae-Gyu;Jung, Yoon-Gyo
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.4
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    • pp.46-52
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    • 2010
  • A flexible-rigid multibody analysis was pen armed to examine the dynamic response of a heavy handling robot system under a worst motion scenario. A rigid body dynamics analysis was solved and compared with flexible-rigid multibody analysis. The modal analysis and test were also carried out to establish the accuracy and the validation of the finite element model used in this paper. For the flexible-rigid multibody simulation, stresses in several major bodies were interested, so that those parts are flexible and other parts are modeled as rigid body in order to reduce computer resources.

Analytical Closed Form Solution for the Impact Load of a Collision between Rigid Bodies and its Application to a Spent Nuclear Fuel Disposal Canister Accidentally Dropped and Impacted on the Ground: Application(Numerical Analysis) (강체간의 충돌에 의한 충격력에 대한 수학적 정해 및 고준위폐기물 처분용기의 지면 추락낙하사고 시의 충돌충격에의 응용: 적용(수치해석))

  • Kwon, Young-Joo
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.28 no.5
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    • pp.451-457
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    • 2015
  • This paper presents the analytical closed form solution for the impact load of a collision between rigid bodies and its application to a spent nuclear fuel disposal canister accidentally dropped and impacted on the ground. This paper performed a study on the numerical rigid body dynamic analysis to compute the impact load between two rigid bodies, especially, the impulsive force which is applied to the spent nuclear fuel disposal canister in the accidental drop and impact event on the ground. Through this study the impulsive force which is occurring in the spent nuclear fuel disposal canister under accidental drop and impact event on the ground and required in the process of structural safety design of the canister is computed numerically. The main content of this numerical study is about the technical method how to compute the impulsive force applied to the canister under the accidental drop and impact event on the ground by using the commercial computer code for the rigid body dynamic analysis. On the basis of this study a problem to compute the impulsive force which is occurring in the canister in the case of collision with the ground is numerically treated. This numerically computed impulsive force is compared with the theoretical value, which shows a good agreement.

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.