• Title/Summary/Keyword: Motion Simulation

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Modeling and Simulation of the 6 DOF Motion of a High Speed Planing Hull Running in Calm Sea (정수중을 활주하는 고속선의 6자유도 운동 모델링 및 시뮬레이션)

  • Yoon, Hyeon Kyu;Kang, Namseon
    • Journal of the Society of Naval Architects of Korea
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    • v.53 no.1
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    • pp.10-17
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    • 2016
  • When a planing hull straightly runs and turns, its floating position and pitch angle are changed depending on its speed, and large transient motion happens. In this paper, six degrees of freedom(6 DOF) equations of motion, which could simulate the motion of a planing hull, are established. Static and dynamic forces in vertical plane are modeled using pre-calculated displacements and metacentric heights depending on various draft, lift under bottom, and vertical damping coefficients which are used to tune the final motion. Hydrodynamic coefficients in horizontal plane at various equilibrium state are calculated by using Lewandowski's empirical formula and the speed-dependent equilibrium state are calculated beforehand by Savitsky's formula. The speed effects are considered by curve-fitting the coefficients at various speed to the polynomials. Accelerating, decelerating and backing, turning, and zig-zag are simulated and compared with the sea trial results, and it is confirmed that the speed reduction, roll, and pitch during such maneuvers of sea trial and simulation are well consistent.

Molecular Dynamics Simulation Studies of Zeolite A. Ⅵ. Vibrational Motion of Non-Rigid Zeolite-A Framework

  • 이송희;최상구
    • Bulletin of the Korean Chemical Society
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    • v.19 no.4
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    • pp.422-428
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    • 1998
  • In the present paper, we report a molecular dynamics (MD) simulation of non-rigid zeolite-A framework only as the base case for a consistent study of the role of intraframework interaction on several zeolite-A systems using the same technique in our previous studies of rigid zeolite-A frameworks. Usual bond stretching, bond angle bending, torsional rotational, and non-bonded Lennard-Jones and electrostatic interactions are considered as intraframework interaction potentials. The comparison of experimental and calculated structural parameters confirms the validity of our MD simulation for zeolite-A framework. The radial distribution functions of non-rigid zeolite-A framework atoms characterize the vibrational motion of the framework atoms. Mean square displacements are all periodic with a short period of 0.08 ps and a slow change in the amplitude of the vibration with a long period of 0.53 ps. The displacement auto-correlation (DAC) and neighbor-correlation (DNC) functions describe the up-and-down motion of the framework atoms from the center of α-cage and the back-and-forth motion on each ring window from the center of each window. The DAC and DNC functions of the framework atoms from the center of α-cage at the 8-ring windows have the same period of the up-and-down motion, but those functions from the center of 8-ring window at the 8-ring windows are of different periods of the back-and-forth motion.

A Review of Simulation for Human Escape on Shipboard (인적요소를 고려한 선상 탈출 시뮬레이션 기술)

  • 김홍태;이동곤;박진형
    • Proceedings of the Korea Society for Simulation Conference
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    • 2001.05a
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    • pp.135-140
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    • 2001
  • In the last years there have been some severe accidents with passenger vessels. So, International Maritime Organization(IMO) has recognized that computer stimulation of the evacuation may be required for passenger vessels. Human elements is a key issues of escape analysis on shipboard. There are technical requirements to simulate of escape analysis for human elements. Technical requirements include model of ship structure, evacuation algorithm, human behaviour analysis and influence of ship listing/motion. This paper provides the key issues and technologies of simulation for human escape on shipboard.

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Analysis of Dynamic characteristic of 2-DOF Contact Slider (2자유도 Contact Slider 모델의 동특성 해석)

  • Park, Kyoung-Su;Chun, Jeong-Il;Park, Young-Pil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.05a
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    • pp.924-929
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    • 2001
  • The flying height of contact slider is determined by vertical and pitching motions of slider. This paper performed the computer simulation for flying height change of contact slider. It is changed by many parameters, contact stiffness, contact damping, air bearing stiffness ratio, a location of mass center, and so on. Computer simulation is performed for knowing for what change of these parameters influences in flying height of contact slider. Disk surface is modeled in harmonic wave with from 10㎑ to 600㎑. Tri-pad slider is modeled in that contact slider has 2-DOF motion (vertical motion, pitching motion). Tri-pad contact slider is analyzed by numerical analysis method in computer simulation.

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Motion Analysis of 5-MW Floating Offshore Wind Turbine (5MW 부유식 풍력발전기의 운동 해석)

  • Shin, Hyun-Kyoung;Kim, Kyoung-Man
    • Journal of Ocean Engineering and Technology
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    • v.25 no.5
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    • pp.64-68
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    • 2011
  • The motion responses of a 5-MW floating offshore wind turbine were simulated in regular and irregular waves and its RAOs and significant motion responses were calculated, respectively. The floating offshore wind turbine employed in this simulation was the OC3-Hywind designed by the National Renewable Research Laboratory, USA. The numerical simulation was carried out using MOSES (Multi-Operational Structural Engineering Simulator), which is widely used to analyze and design floating offshore structures in the gas and oil industry.

Improvement based on Jansen mechanism in moving vehicles and exploration equipment sector. (이동차량 및 탐사용 장비 분야에서 Jansen 메커니즘을 통하여 정숙성/굴곡지 형 이동성능 개선에 관한 연구)

  • Park, Minjae
    • Proceeding of EDISON Challenge
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    • 2016.03a
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    • pp.516-517
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    • 2016
  • I use Jansen mechanism to reduce the unnecessary motion of car body and improve the motion performance capability in the rugged terrain To reduce the unnecessary motion, the positional variation of a main body of vehicle should be minimized. In order to reduce the change of height and control the speed at every moment when vehicle move, 16 legs or more are installed on a crankshaft and the paths of leg motions need to be considered in the rugged terrain. The vehicle will be optimized so that it produces a sufficient speed and torque for practical use. Finally, I designed proper body with Edison simulation. The simulation is good for beginners of mechanism design.

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Automatic Motion Generator and Simulator for Biped Walking Robots (이족 보행 로봇을 위한 자동 모션 제너레이터 및 시뮬레이터)

  • 최형식;전창훈;오주환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.948-953
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    • 2004
  • For stable walking of various biped walking robots(BWR), we need to know the kinematics, dynamics and the Zero Moment of Point(ZMP) which are not easy to analyze analytically. In this reason, we developed a simulation program for BWRs composed of 4 degree-of-freedom upper-part body and 12 degree-of-freedom lower-part of the body. To operate the motion simulator for analyzing the kinematics and dynamics of BWES, inputs for the distance between legs, base angle, choice of walking type, gaits, and walking velocity are necessary. As a result, if stability condition is satisfied by the simulation, angle data for each actuator are generated automatically, and the data are transmitted to BWRS and then, they are actuated by the motion data. Finally, we validate the performance of the proposed motion simulator by applying it to a constructed small sized BWR.

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Development of Simulation Model for Power Tiller Motion (동력경운기(動力耕耘機)의 운동(運動) 시뮬레이션을 위한 모델 개발(開發))

  • Kim, K.U.
    • Journal of Biosystems Engineering
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    • v.12 no.2
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    • pp.1-15
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    • 1987
  • A mathematical model is developed and computer programmed for simulation of power tiller motion. The model consists of a main body and two driving wheels resulting in an 8 degrees of freedom system. Drawbar loading is also included by coupling the model with a sub-model representing the implement to be used. The computer program SIMPTL can predict motion characteristics and static stability of power tiller under a given set of ground and operation conditions.

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A Research on the Development of CAI Courseware on the Motion of Falling Body (낙체운동에 관한 컴퓨터보조학습 코스웨어 개발 연구)

  • Koo, Duk-Gil;Sung, Jae-Soo
    • Journal of The Korean Association For Science Education
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    • v.10 no.2
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    • pp.49-54
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    • 1990
  • The purpose of this paper is to promote the physics study of high school students with computer. A computer simulation for falling motion is used to provide the students a chance to study by themselves viewing the concrete motion pictures of computer. By this simulation program, the students can observe various movements of a falling body with calculated distance according to falling time.

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Simulation of Motion and Overturns for Power Tiller-Trailer System (동력경운기(動力耕耘機)-트레일러 시스템의 운동(運動) 및 전도(轉倒) 시뮬레이션)

  • Park, K.J.;Park, U.L.
    • Journal of Biosystems Engineering
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    • v.17 no.1
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    • pp.27-36
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    • 1992
  • Computer simulation was carried out to predict the motion and overturns of power tiller-trailer system this system when traveing over an obstacle on inclined planes. To estimate the effects of design factors (mass center of main body and wheel base), ground factors (ground inclination and height of obstacle), and operation factors (traveling velocity) on the sideways overturn, the motion of power tiller-trailer system was simulated as the factors were varied with five different levels.

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