• Title, Summary, Keyword: Dynamic Characteristic

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The Study of Dynamic Characteristic of PMLSM According to Variable Load (영구자석형 선형 동기 전동기의 가변부하에 따른 동특성 해석)

  • Lee, Seung-Hoon;Jang, Ki-Bong;Kim, Gyu-Tak
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.4
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    • pp.596-602
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    • 2008
  • This paper presents the dynamic characteristic analysis of Permanent Magnet Linear Synchronous Motor(PMLSM) according to variable load. In order to analyze dynamic characteristics, finite element method(FEM) was used for calculation of the parameter and the Matlab simulink was used for dynamic characteristic simulation. The measuring system of the dynamic characteristics was manufactured and the experiment results were compared with the simulation results.

A Study on Flow Rate Characteristic and Dynamic Performance on Diaphragm Solenoid Valve (다이어프램형 밸브의 유량특성과 동적성능에 관한 연구)

  • Jeong, C.S.;Yang, S.Y.
    • Journal of Drive and Control
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    • v.10 no.3
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    • pp.27-33
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    • 2013
  • Solenoid valve has used in various industrial field extensively. A solenoid valve has different size, shape and method of operation accordantly to industrial field. Many researchers study on kinds of solenoid valve such as flow rate, dynamic, magnetic field, valve shape and operating method. But the flow rate characteristic and dynamic response time performance on the diaphragm valve are not studied. This paper describes the flow rate characteristic and dynamic response time performance on the diaphragm valve. At first, the diaphragm valve is simulated in AMESim simulation tool. AMESim model found that an effect of valve performance depends on parameter. The parameter is the diaphragm orifice area. And the performance test bench confirms the effect in this parameter. Finally, it finds out the flow rate characteristic and dynamic response time performance on the diaphragm valve.

A Study on Characteristics of Perceptual Presentation Methods of Interior Design (실내디자인의 지각적 프리젠테이션 방법의 특성에 관한 연구)

  • 이종란
    • Korean Institute of Interior Design Journal
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    • no.29
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    • pp.265-272
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    • 2001
  • The perceptual presentation of interior design is to represent an interior space planned by a designer as if people see it in reality. The perceptual presentation methods that have developed are perspectives, full-scathe models, small-scale models, photography of models, video taping of models, computer images, computer animation, and virtual reality. The purpose of this study is to investigate limits of those perceptual presentation methods according to their characteristics. The methods have characteristics that are either static or dynamic and either monoscopic or stereoscopic. In terms of representing interior spaces and perceiving interior spaces, the dynamic characteristic is more helpful than the static characteristic because the dynamic characteristic provides consecutively changing views of interior spaces when people walk around within the spaces. The stereoscopic characteristic is more helpful than the monoscopic characteristic because the stereoscopic characteristic provides the binocular depth perception. Full-scale models, small-scale models, virtual reality that have dynamic and stereoscopic characteristics, are most effective. The next effective methods are video taping of models and computer animation that have dynamic and monoscopic characteristics. The last effective methods are perspectives and photography each of models that haute static and monoscopic characteristics. But the most effective methods can nut be said that those are perfect because each of them still has limits. Designers have to consider the limits of each perceptual presentation method to find a way that shows their designs most effectively. To develop the perceptual presentation methods of interior design, researchers should focus on the helpful characteristics that are dynamic and stereoscopic.

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Analysis on Dynamic Characteristic and Circuit Parameter of Linear Switched Reluctance Motor by Electromagnetic Analytical Method (전자기 해석법에 의한 직선형 스위치드 릴럭턴스 전동기의 회로정수 도출 및 동특성 해석)

  • Park, Ji-Hoon;Ko, Kyoung-Jin;Choi, Jang-Young;Jang, Seok-Myeong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.2
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    • pp.318-327
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    • 2010
  • This paper deals with analysis on dynamic characteristic and circuit parameter of linear switched reluctance motor by electromagnetic analytical method. Above all, using space harmonic method, which is electromagnetic method, the air-gap flux density is analyzed in the both align and unaign positions, and the inductance profile, force characteristic and resistance per phase are calculated by means of the process. The validity of the analyzed results are demonstrated by the finite element method(FEM) and manufacture of the prototype machine. Second, the dynamic simulation is analyzed by the use of circuit parameters derived from analytical method, and the operating system of the prototype machine is manufactured to demonstrated the validity of simulation analysis. As a result, it is considered that the characteristic equation suggested in this paper will contribute to the design, analysis and application of LSRM.

A Study of Korean (Industrial) Standards for Pneumatic Servo Valve (공압서보밸브 KS규격 정립에 관한 연구)

  • 김동수;이원희;최병오
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1231-1234
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    • 2003
  • Pneumatic servo valve which is widely applied in industrial world is advanced technology compounded with electric, electronic and machine. And It is consist of Linear Force Motor. Spool Commutation Mechanism and Microprocessor. In this study, we accomplished test method of Linear Force motor test, Static characteristic test, Dynamic characteristic test for KS(Koran industrial standard) of Pneumatic servo valve. we accomplished study about the main item of Static characteristic test which is related to unload flow characteristic test. And Dynamic characteristic test was step input test and frequency response test. Specially about frequency response test, There was a difficulty resulting from the time delay problem caused by the basic compressibility of air. In order to solve the problem in this study. we proposed two methods. First, displacement of the servo valve spool was directly measured by using a laser sensor. Second, method of calculating control flow by measuring pressure and temperature of chamber.

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The Dynamic Characteristic Analysis of PMLSM according to Variable Load (부하 가변에 따른 리니어 모터의 동특성 해석)

  • Lee, Seung-Hoon;Jeong, Su-kwon;Kim, Gyu-Tak
    • Proceedings of the KIEE Conference
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    • pp.83-85
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    • 2006
  • In this paper, the dynamic characteristic according to variable load of Permanent magnet Linear Synchronous Motor(PMLSM) is dealt with carefully. And the experiment machine is manufactured for analysis of dynamic characteristic. The results of both simulation and experiment are discussed.

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Dynamic characteristic analysis of SMT mounter system (SMT 마운터의 동특성 분석)

  • Rim, Kyung-Hwa;Jung, Jin-Ho;Beom, Hee-Rak
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.440-445
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    • 2011
  • Dynamic characteristic analysis is required in developing SMT mounter system with high installation speed and position precision, because of vibration source occurred by positioning head. This paper presents the method of improving dynamic characteristic of SMT(Surface Mount Technology) mounter with finite element method and modal test. The design direction is that natural frequencies of SMT mounter must be higher than the vibration source. In addition, the effect of input shaping on residual vibration reduction is investigated by simulating the response of a first-order system.

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A study on the Turbine-Generator Governor Dynamic Characteristic Testing System (터빈-발전기 조속기의 동특성 시험시스템 개발에 관한 연구)

  • Choi, Hyung-Joo;Lee, Heung-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.10
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    • pp.1399-1411
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    • 2012
  • The grid frequency is controlled cooperatively by the governor of the Turbine-Generator and the automatic generation controller(AGC) of the KPX(Korea Power Exchange). It is a basic requirement that the reliability of the governor is verified to enhance the power system stability but it is not easy to confirm the response characteristics of the governor because all generators are operated in the grid system that has the constant voltage and frequency. Therefore, it is necessary to study a new test method in order to examine the governor dynamic characteristic in the similar fault conditions. A study has shown that it is verified to simulate the turbine-generator power control system, the governor response characteristic under limited conditions and contribution of AGC with the gas turbine generator simulation model as well as demonstrate the dynamic response of the governor with the developed governor dynamic characteristic tester based on digital controller while the turbine-generator is connected to the grid system. This tester is constructed by the built-in functions of the turbine-generator main controller. In this treatise, the theoretical background, development method and the results of both simulations and demonstrations are described as another way to verify the turbine-generator governor dynamic characteristics.

Dynamic characteristic change of a PSC girder due to fatigue (피로에 따른 PSC거더의 동적특성 변화)

  • Choi, Sang-Hyun;Lee, Chang-Soo;Shin, Ki-Hoon;Kim, Tae-Kyun
    • Proceedings of the KSR Conference
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    • pp.1533-1538
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    • 2011
  • The dynamic characteristics such as resonant frequencies and dampings have been utilized as important parameters in dynamic behavior and inverse analyses. In general, the dynamic parameters have been determined based on design and experimental data, but experimental studies on the time-dependent changes of the dynamic parameters during service have rarely been conducted. Especially, unlike highway bridges, it is much easier for railroad bridges to estimate accumulated amount of fatigue because of the controlled train operation, and the study of dynamic characteristic change due to fatigue is useful, since it can enhance the accuracy of dynamic analysis. In this paper, the dynamic characteristic change due to fatigue is measured via the modal test on the PSC girder during a fatigue test. The test specimen utilized in the test is the IT girder which enhances the sectional capacity of the conventional PSC girders. The test specimen is designed 10m long and the modal tests are conducted during the application of fatigue load two million times. The test result shows that considerable changes in the measured dynamic parameters are observed as the fatigue accumulates, and these changes during the service life should be considered in designing railroad bridges.

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Dynamic Characteristic Analysis at Each Operating Condition for Electric Ship Propulsion System (선박용 전기추진시스템의 운전조건별 Dynamic 특성 연구)

  • Jeon, Won;Wang, Yong-Peel;Jung, Sang-Yong
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.8
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    • pp.1296-1302
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    • 2008
  • This paper deals with modeling and dynamic characteristic analysis of a large-powered LNG electric ship propulsion system. Basically, we perform to verify the adequacy of system modeling on the sea going mode and LNG unloading mode based on load flow analysis. And then, we observe the dynamic characteristic of system to perform motor starting analysis and transient stability analysis. Particularly, this paper examine analysis results in comparison with the IEEE standard 141 and the class rule. Hence, this paper has evaluated stability of the electric ship propulsion system at static and dynamic conditions.