• Title, Summary, Keyword: 시스템다이나믹스

Search Result 183, Processing Time 0.034 seconds

Examination on Active Pneumatic Vibration Isolation Table with Moving Masses on It by Time Delay Control (이동 질량을 포함하는 능동형 공압제진대에 대한 시간지연제어기법의 적용 검토)

  • Shin, Yun-Ho;Moon, Seok-Jun;Chung, Jung-Hoon;Kim, Byung-Hyun
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.21 no.9
    • /
    • pp.858-867
    • /
    • 2011
  • As applying an active control technique to a pneumatic vibration isolation system, the settling time for the payload excitation could be remarkably reduced as well as the improvement of isolation performance for the ground vibration. Some previous researches were dealt with the settling time through the simulation or experiment but, the discussion on the simulation or experimental results including moving parts, such as a XY-stage, on the isolation table rarely exists. As considering the moving part, the dynamic model could be time varying system and in such a case the force imposed on pneumatic vibration isolation table could be described by inertial forces of moving parts according to Newton's 3rd law, the action and reaction law. In this paper, the simulation procedure of the 3-DOF active pneumatic vibration isolation system including moving parts by TDC(time delay control) technique is proposed and the effectiveness through simulation results are also shown.

Analysis of RFID Utilization using System Dynamics (시스템 다이나믹스를 활용한 RFID 도입 효과 분석)

  • Baek, Sung-Won;Kim, Dong-Wan;Ju, Jung-Eun;Koo, Sang-Hoe
    • Proceedings of the Korea Society of Information Technology Applications Conference
    • /
    • /
    • pp.419-429
    • /
    • 2007
  • 유비쿼터스 시대가 도래하면서 많은 기업들이 RFID(Radio Frequency Identification)의 도입에 대한 관심을 보이고 있다. 그러나 RFID의 도입 비용이 높고, 도입 후 효과에 대한 예측이 어렵기 때문에 기업은 도입을 미루고 있는 실정이다. 이에 본 연구에서는 시스템 다이나믹스 방법론을 활용하여, 소매업이 RFID 시스템 도입을 할 때, 기업의 수익 및 업무 효율성, 고객 만족도에 미치는 효과를 분석하는 모텔을 구축하고 시뮬레이션을 수행하였다. 이러한 분석과정을 통해, RFID의 활용은 매장 및 창고관리자동화에 긍정적인 영향을 미치는 것을 확인할 수 있었다. 또한 자동화에 가장 큰 영향을 미치는 요인으로는 자동화 수준임을 밝혔으며, 자동화 수준이 높아지게 되면, 수익과 업무효율 및 고객 만족도가 증가됨을 확인할 수 있었다.

  • PDF

Evaluation of Spatial Information Industry Using System Dynamics (시스템다이나믹스를 이용한 공간정보산업의 평가예측)

  • Choi, Ki-Youl;Cho, Won-Woo;Kim, Kam-Rae
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
    • /
    • v.28 no.5
    • /
    • pp.515-522
    • /
    • 2010
  • With the development of information technology, the demand on digitalized space information is being largely expanded in our society. Especially, the recency securing of material as well as various policy alternatives like expansion on an application scope are being required in the spatial information utilization field, such as efficient use and management of the land, various spatial plans, environment and disaster management, etc. The present research aims to suggest an evaluation model by applying the system dynamics theory for dynamic analysis on utilization of this spatial information.

Characteristics of Filters for Signal Processing Applied to Wind Turbine Controllers (풍력발전 제어에 적용되는 계측신호처리 필터에 대한 특성 고찰)

  • Moon, Seok-Jun;Shin, Yun-Ho;Chung, Tae-Young;Rim, Chae-Whan;Ryu, Ji-Yune
    • New & Renewable Energy
    • /
    • v.7 no.4
    • /
    • pp.58-65
    • /
    • 2011
  • In variable-speed variable-pitch wind turbines, the conventional approach for controlling power-production operation relies on a generator-torque controller and a rotor-collective blade-pitch controller. Both controllers use the generator speed measurement as the sole feedback input. In order to mitigate unwanted excitation of the control system, many filters are adopted. In this study, the characteristics of some filters for signal processing are investigated based on frequency response function. They include low-pass filters, band-pass filters, and notch filters. Especially, this study focuses on design parameters of their filters.

Design of Hybrid Mount to Naval Shipboard Considering Shock Resistance (내충격 성능을 고려한 함정용 하이브리드 마운트의 설계)

  • Jo, Hye-Young;Shin, Yun-Ho;Moon, Seok-Jun;Jung, Woo-Jin
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.102-107
    • /
    • 2012
  • In this study, the design procedure of hybrid active mount by an electro-magnetic actuator is proposed to reduce the transmitted force from naval shipboard equipment to ship hull structure. The hybrid type mount which is composed of a passive rubber element and an electro-magnetic actuator is introduced and, through the vibration measurement for the objective pump system, the required force of the actuator is computed and discussed in detail. The initial designs were supposed for three types, one is moving coil type actuator and the others are moving permanent magnet type actuators. Based on the initial design concept, the final designs considering shock resistance and interference with mover and stator are proposed and examined.

  • PDF

Wind Turbine Performance for Eigen Value Change of Pitch Controller (피치제어기의 고유치 변화에 따른 풍력발전기의 성능)

  • Kim, Jong-Hwa;Moon, Seok-Jun;Shin, Yun-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.337-343
    • /
    • 2012
  • NREL(National Renewable Energy Laboratory) Baseline controller conduct using method proposed RISO National Laboratory in Region 3. which designed the blade-pitch control system using a single degree-of-freedom model of the wind turbine. Idealized PID-Controlled rotor-speed error will respond as a second-order system with the natural frequency and damping ratio. RISO proposed specific natural frequency(=0.6 rad/s) and damping ratio(=0.7). If specific Eigen value apply to NREL 5 MW wind turbine, differ with pitch respond for simulation results of RISO report. Variation of specific eigen value investigate performance of NREL 5 MW wind turbine.

  • PDF