• 제목/요약/키워드: Transient analysis

검색결과 3,054건 처리시간 0.036초

유한요소법과 등가회로법의 결합을 이용한 인버터 구동 3상 농형 유도전동기의 과도 특성 해석 (Transient Analysis of Inverter-fed Three Phase Squirrel Cage induction Motor Using A Combined Method of Finite Element Method and Equivalent Circuit)

  • 조용;권병일;김재우;김병택
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 B
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    • pp.805-807
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    • 2002
  • In this paper, a method for an accurate and fast transient analysis, which employs a single slot model for the rotor, is presented. The equivalent circuit parameters are extracted from a combined method of F. E. M and equivalent circuit on 1 slot rotor boundary condition. Two kinds of circuit parameters for each slip are applied to equivalent circuit controlled by variable-voltage variable- frequency. One is the constant parameters at rated speed, and the other is the parameters varying in accordance with slip-frequency. The computer characteristics of the suggested method for four-pole 1.5KW induction motor are compared with those of Equivalent circuit for the transient analysis.

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풍력발전이 연계된 배전선로 전압 및 과도상태 해석 (Voltage and Transient State Analysis of Distribution Line connected to Wind Power Generation)

  • 김세호;나경윤;김건훈
    • 한국태양에너지학회 논문집
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    • 제26권2호
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    • pp.61-67
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    • 2006
  • The use of the wind energy resource is a rapidly growing area world-wide. The number of installed units is continuously increasing, and therefore, it is important to respect and to deal with the impact of wind power generation system. From the view of an electric grid utility, there is a major problem with the impact of the wind system on the voltage of the electric grid, to which a turbine is connected. In this paper, it is investigated the voltage impact and transient state analysis on distribution line, with which wind power generation system is connected. Connections of wind power system usually occur to voltage drop due to reactive power absorption and sometime result in higher than nominal voltage.

브레이크 드럼의 형상에 따른 과도 열전달 해석 (Transient Heat Transfer Analysis of Brake Drum Shape)

  • 김양술;안수철
    • 한국정밀공학회지
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    • 제25권8호
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    • pp.65-71
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    • 2008
  • This paper presents a transient heat transfer analysis of a drum brake shape. The transient heat transfer analysis of automotive drum brakes with frictional contact is performed by using the finite element method. The drum brake type studied in the page is the internally expanding one in which two shoes fitted externally with frictional material are forced outward against surface a rotating drum on the wheel unit. In this case, the braking power is produced by the friction force between a drum and a lining, and is converted into heat. The brake drum has constant material properties. The air inside the drum has temperature-dependent thermal conductivity and enthalpy. Radiation effects are ignored. The result explains the reason why hair crack and cause of drum failure occur. The temperature of drum is in proportion to the drum thickness and nonlinear changes at every points of drum. It's necessary for the decrease of the drum temperature to make the air inside drum flow.

Transient analysis of cross-ply laminated shells using FSDT: Alternative formulation

  • Sahan, Mehmet Fatih
    • Steel and Composite Structures
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    • 제18권4호
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    • pp.889-907
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    • 2015
  • This paper aims to present an alternative analytical method for transient vibration analysis of doubly-curved laminated shells subjected to dynamic loads. In the method proposed, the governing differential equations of laminated shell are derived using the dynamic version of the principle of virtual displacements. The governing equations of first order shear deformation laminated shell are obtained by Navier solution procedure. Time-dependent equations are transformed to the Laplace domain and then Laplace parameter dependent equations are solved numerically. The results obtained in the Laplace domain are transformed to the time domain with the help of modified Durbin's numerical inverse Laplace transform method. Verification of the presented method is carried out by comparing the results with those obtained by Newmark method and ANSYS finite element software. Also effects of number of laminates, different material properties and shell geometries are discussed. The numerical results have proved that the presented procedure is a highly accurate and efficient solution method.

MIL-S-901D 충격시험과 과도응답해석을 이용한 DDAM 특성에 관한 연구 (Study for Characteristics of DDAM using MIL-S-901D Shock Test and Transient Response Analysis)

  • 송오섭;김룡
    • 한국소음진동공학회논문집
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    • 제16권11호
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    • pp.1132-1139
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    • 2006
  • Non-contact underwater explosions against surface ship could cause extensive equipment damage during wartime service. Thus, the need to develop methods for the design of shock resistant equipment structures and systems was strongly established. In analytical methods, DDAM(Dynamic Design and Analysis Method) and transient repsonse method are used for ship shock design. In this paper, to analyze the characteristics of DDAM, medium weight shock test, DDAM and transient response analysis for missile system equipment are performed.

강체 운동을 고려한 충격을 받는 외팔 보의 동적 해석 (Dynamic Analysis of a Cantilever Beam Undertaking Impulsive Force That Undergoes Rigid Body Motion)

  • 임홍석;유홍희
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2005년도 춘계학술대회논문집
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    • pp.890-895
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    • 2005
  • This paper presents the dynamic analysis of a cantilever beam undertaking impulsive force that undergoes rigid body motion. The transient response of the beam induced by the impulsive force and the rigid body motion is calculated based on hybrid deformation variable modeling method by applying the Rayleigh-Ritz assumed mode method. The stiffness variation effect caused by the rigid body motion is considered in this modeling. The effects of the impulsive force position and the angular velocity on the transient responses of the beam are investigated through numerical studies.

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부분지지되고 개구부를 갖는 적층복합판의 동적해석 (Transient Analysis of Partially Supported Laminated Composite Plates With Cutouts)

  • 이원홍;한성천;윤석호
    • 한국강구조학회 논문집
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    • 제10권4호통권37호
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    • pp.667-676
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    • 1998
  • 본 연구에서는 부분지지되어 있고 사각형의 개구부를 갖는 적층복합판의 과도해석을 유한요소법을 이용하여 연구하였다. 수학적 지배방정식은 변분과 일차전단변형이론을 고려하여 유도하였고 적층판의 폭-두께비, 재료의 특성, 적층각도, 지지조건이 중앙점의 동적응답에 미치는 영향에 대하여 연구하였다. 수치적인 결과는 그래프와 표로 나타내었으며 참고문헌의 결과와 비교 분석하였다.

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Transient oscilaltion analysis for MEMS resonant accelerometer

  • Sangkyung Sung;Lee, Jang-Gyu;Taesam Kang;Sung, Woon-Tahk;Chul Hyun
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2002년도 ICCAS
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    • pp.98.1-98
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    • 2002
  • In principle, a resonance type sensor generally has an oscillation characteristic. Thus, an analysis on transient oscillation response takes a great interest since it is related to the performance of resonant sensor. In particular, system bandwidth has tradeoff with oscillation accuracy, i.e. quality factor. For an efficient analysis of the oscillation characteristic, several analytic methods are introduced and summarized. The results are fundamentally based on the classical describing function method, but can explain the transient oscillation by introducing time varying concept about the predicted limit cycle. After introducing those methods, the application results to the specified system...

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충격력을 받는 회전하는 외팔 보의 동적 해석 (Dynamic Analysis of an Impulsively Forced Rotating Cantilever Beam)

  • 임홍석;유홍희
    • 한국소음진동공학회논문집
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    • 제16권3호
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    • pp.226-232
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    • 2006
  • This paper presents the dynamic analysis of an impulsively forced rotating cantilever beam with rigid body motion. The transient response induced by the impulsive force and the rigid body motion of the beam are calculated using hybrid deformation variable modeling with the Rayleigh-Ritz assumed mode methods. The stiffness variation effect due to the rigid body motion of the beam is considered in this study Also, the effects of the impulsive force position and the angular velocity on the transient responses of the beam are investigated through numerical works.

A Diesel Generator Model with Fluctuating Engine Torque Including Magnetic Saturation for Transient Analysis using XTAP

  • Sakamoto, Orie
    • Journal of Electrical Engineering and Technology
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    • 제10권3호
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    • pp.1298-1303
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    • 2015
  • Diesel engine generators are widely used in the world, especially in remote site power systems as distributed generators. A weak distribution feeder with a small diesel engine may suffer from voltage and power fluctuations due to misfiring of the engine cylinder. In this study, new generator model with example engine torque was developed for the electromagnetic transient analysis program for power systems named XTAP. The configuration and verification results of the developed model are presented in the paper. The model is considered to be useful for analyses of small power systems with those diesel engines.