• Title/Summary/Keyword: RecurDyn

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Dynamic Analysis of a Flow Passage Opening Device in Flight Profile of a High-speed Vehicle (고속 비행체의 비행궤적별 유로개방장치 동역학 해석)

  • Jung, Sungmin;Park, Jeong-Bae
    • Journal of the Korean Society of Propulsion Engineers
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    • v.19 no.5
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    • pp.98-103
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    • 2015
  • A flow passage opening device utilizing an acceleration follow-up technique allows fuel to flow continuously through a pressurized fuel tank system. It is very difficult to test the device in a real flight situation because of severe test condition and a cost problem. In this paper, therefore, the results of a basic negative g test conducted by low-speed airplane are compared with RecurDyn simulation. Dynamic behavior of the device in total flight profile of a high-speed vehicle is also analyzed by using RecurDyn to predict its performance.

Analysis of a Flow Passage Opening Device using RecurDyn (RecurDyn을 활용한 가속도추종 유로개방장치 해석)

  • Jung, Sungmin;Kim, Young Shin;Park, Jeong-Bae;Jun, Pil Sun
    • Journal of the Korean Society of Propulsion Engineers
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    • v.18 no.3
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    • pp.78-83
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    • 2014
  • A special part such as a flow passage opening device is required to prevent the disconnection of fuel transfer in a pressurized fuel tank. To meet this requirement, the device utilizing an acceleration follow-up technique was invented. RecurDyn, a dynamic analysis tool, is introduced in this article to predict the device's performance and to determine parameters affecting it. In the analysis, it is shown that balancing weights can open the passage in accordance with fuel position.

Development of RecurDyn Module for Wind Turbine Analysis Applying BEM Theory (BEM 이론을 적용한 풍력발전기 해석용 RecurDyn 모듈 개발)

  • Lim, Dae Guen;Yoo, Wan Suk
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.2
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    • pp.115-120
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    • 2014
  • In this study, a module is developed for modeling and analyzing dynamic behavior of a wind turbine using RecurDyn, which is a commercial multi-body dynamics software developed by FunctionBay, Inc. The wind turbine consists of tower, nacelle, hub and blades. Tower and blades are regarded as flexible bodies for considering elastic effect using beam theory and spring force. In this paper, a constant speed wind was assumed and aerodynamic force is modeled using BEM theory. Dynamic analysis applying this aerodynamic force is carried out. To verify the validity of analysis results, these results are compared to those of GH-Bladed which is a commercial software for analyzing wind turbine system distributed by Garrad Hassan.

Co-Simulation for Electric Forklift System Using RecurDyn and Matlab with Simulink (RecurDyn과 Matlab/Simulink를 이용한 전동지게차 시스템의 Co-Simulation)

  • Kim Sang-Hoon;Mok Hyung-Soo;Yun Duk-Jin
    • Proceedings of the KIPE Conference
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    • 2006.06a
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    • pp.342-344
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    • 2006
  • 전동기 구동시스템의 사양 결정과 설계를 위해서는 부하의 부하토크, 관성계수, 마찰계수 등의 정보에 의한 부하 모델링이 반드시 필요하다. 전동지게차 시스템의 모델링을 위해서는 차체의 중량과, 바퀴의 제원 등 제한적인 정보를 기초로 하여 번거로운 계산과정을 거쳐야 하지만 정확한 정보를 얻기에는 어려움이 따른다. RecurDyn은 기계시스템의 모델링과 시뮬레이션을 하는 3차원 해석이 가능한 Functionbay사에서 개발한 시뮬레이션 프로그램으로서 3D의 기계적인 형상을 작성하고, 물성을 입력하면 부하토크, 등가 관성계수, 마찰계수를 출력할 수 있어 전동기구동시스템의 시뮬레이션 프로그램인 Matlab/Simulink와 결합하여 시뮬레이션을 수행 할 경우 부하 모델링 없이 전체 구동시스템의 특성 시뮬레이션이 가능하다. 본 논문에서는 영구자석 동기전동기로 구동하는 전동지게차 시스템을 대상으로 RecurDyn 프로그램의 활용을 소개하고 Matlab/Simulink를 이용한 결함 시뮬레이션의 가능성을 보고자 한다.

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Co-Simulation for Electric Motor Drive System Using RecurDyn and Matlab with Simulink (RecurDyn과 Matlab/Simulink를 연동한 전동기 구동시스템의 시뮬레이션)

  • Kim, Sang-Hoon
    • Journal of Industrial Technology
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    • v.27 no.A
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    • pp.163-168
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    • 2007
  • For an accurate computer simulation to motor drive systems, the target mechanical load system driven by a motor needs to be model its characteristics accurately. In general, a load system is modeled simply with system parameters such as approximated system inertia and friction. So, simulation results have some errors compared with experimental results for a real load system. RecurDyn is a mechanics simulation program for 3-dimension analysis to mechanical load systems. From this program, parameters such as a load torque, a system inertia and a viscous friction can be obtained accurately which are required to model a mechanical system. Also, this program operates together Matlab/Simulink which is used to simulate electrical motor drive systems. So, an accurate simulation for the whole system with a motor drive system and a mechanical load is possible. This paper introduces an application of RecurDyn program to an electric forklift drive system using IPMSM(Interior Permanent Magnet Synchronous Motor) and examines the feasibility of co-simulation it with Matlab/Simulink.

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MATHEMATICAL MODELING OF FERTILIZER IMPACTION USING $RecurDyn^{\textregistered}$

  • J. Y. Rhee;J. S. Hwang;Kim, H. J.
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 2000.11b
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    • pp.430-437
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    • 2000
  • Fertilizer impaction mechanism was simulated using a commercial program RecurDyn$^{(R)}$ a dynamic program that could handle contact problems. Even if there had been numerous papers on modeling of fertilizer applicator, the performance predictions were not satisfactory due to simplification in modeling. The most significant simplification was assumption of fertilizer particles as a solid particle. The assumption would eliminate rotation of fertilizer particles during the impaction mechanism. However, impaction of rotating body would be different from that of a solid particle. This paper introduced how the impaction was modeled using RecurDyn$^{(R)}$. In order to simulate, restitution coefficient and contact time was measured. A stiffness coefficient and a damping coefficient of a fertilizer was theoretically estimated using the measured data. Validity of the simulation result was not proved yet, but judged to be promising.ged to be promising.ing.

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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 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.

Vibration Analysis of Compressor and Pipe Using RecurDyn (RecurDyn 을 이용한 압축기 및 배관 진동 해석)

  • Kwon, Seungmin;Son, Youngboo;Ha, Jonghun;Yoo, Hong Hee
    • Transactions of the KSME C: Technology and Education
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    • v.3 no.2
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    • pp.117-124
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    • 2015
  • Recently, noise reduction in room air conditioner has been one of the most important issues as well as cooling efficiency. A rotary compressor is widely used in room air conditioners. But, the rotary compressor is the dominant vibration/noise source in an air conditioner. A number of studies have been conducted on reducing rotary compressor vibration/noise through improving muffler and resonator design. However, a noise delivering path between compressor and pipe is not fully taken into consideration. In this paper, the vibration analysis model of rotary compressor is modeled using RecurDyn and experimental validation is presented.