• Title/Summary/Keyword: Ride

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A Study on the Optimization of the Alignment Considering the Ride Comfort in the Case of the Superimposition of Vertical and Horizontal Curves (종곡선/평면곡선 경합 시 승차감을 고려한 선형최적화에 관한 연구)

  • Um, Ju-Hwan;Yang, Sin-Chu;Choi, Il-Yoon
    • Proceedings of the KSR Conference
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    • 2010.06a
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    • pp.1943-1950
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    • 2010
  • Superimposition of horizontal and vertical curves may hamper the ride comfort and the running stability of train and largely affect the maintenance cost. However, in many cases, it's not easy to make a track plan because of the fixed points (bridge, tunnel, turnout, catenary system, etc.) to be avoided due to the geographic conditions or to be passed for utilization of existing structures. In this study, when the horizontal and vertical curves are superimposed, in order to optimize the horizontal curve in aspect of the ride comfort, the object function $P_{CT}$ was developed and verified by vehicle dynamic analysis. Also, the solution algorithm for simplified evaluation method was presented.

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A Study on Determination of Fault Ride Through Capability for Wind Turbine Generators (풍력 발전기의 Fault Ride Through 연계 기준 수립에 관한 연구)

  • Pyo, Gi-Chan;Park, Jin-Woo;Moon, Seung-Il;Jeon, Young-Soo;Kwak, No-Hong
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.1166-1167
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    • 2008
  • 풍력 발전기의 계통 연계 기준에서 Fault Ride Through 규정은 사고 시 계통의 응동 특성을 결정하기 때문에 해당 계통의 특징을 반영하여 결정되어야 한다. 이에 여기에서는 세계 각국의 풍력발전기에 적용되는 Grid code에 대해 분석하고, 이를 바탕으로 FRT 규정의 수립에 필요한 기술적 요건에 대해 검토한 후, 해당 규정 수립을 위한 방법론을 제시한다. 이때, 구체적인 parameter 설정은 제주계통을 대상으로 PSS/E를 이용한 안정도 모의 결과에 따라 사고 시 계통의 전압 특성을 반영할 수 있도록 하였다.

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Ride-through of DFIG Wind Turbine Systems Using Energy Storage Unit

  • Nguyen, Thanh Hai;Lee, Dong-Choon
    • Proceedings of the KIPE Conference
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    • 2010.07a
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    • pp.184-185
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    • 2010
  • This paper deals with a ride-through technique of doubly-fed induction generator (DFIG) wind turbine systems using energy storage unit (ESU). By increasing the machine speed, some portion of the turbine power can be stored in the system inertia during grid faults. Also keeping the operation of rotor-side converter (RSC) and grid-side converter (GSC), the rotor current and DC-link voltage can be limited. The effectiveness of the proposed method is verified by simulation results for 2[MW] DFIG wind turbine system.

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Power Loss Ride-Through of Industrial Inverter (산업용 인버터의 Power Loss Ride-Through)

  • Jeon, M.R.;Kim, K.Y.;Kim, J.B.;Kim, K.S.
    • Proceedings of the KIPE Conference
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    • 2010.07a
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    • pp.309-310
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    • 2010
  • 일반적으로 유도전동기를 구동시키기 위한 범용 인버터는 입력 전원에 정전이 발생하였을 경우 부하에 따라 수msec에서 수백msec 안에 저전압 트립이 발생하여 PWM 출력이 차단된다. 부하의 관성이 큰 경우 전원이 복구 되었을 때, 기존의 속도로 제어되기 위해서는 부하가 완전히 멈춘 후 인버터를 구동시키고, 다시 큰 관성의 부하를 가속하는데 긴 시간이 필요하다. 본 논문은 유도전동기를 V/f 제어방법으로 운전할 경우 정전이 발생했을 때 인버터의 출력을 차단하지 않고 연속적인 제어를 행하는 Ride-Through 방법으로서 부하의 관성 에너지를 인버터 직류단에 회생시키도록 출력 주파수를 제어하는 방법을 제안하고 실험을 통해 이를 검증하였다.

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Simulation of Dynamic Characteristics of Agricultural Tractor(I) - Development of 3 Dimensional Dynamic Tractor-Trailer Model - (농용 트랙터의 동특성 시뮬레이션(I) - 3차원 동적 트랙터 -트레일러 모델 개발 -)

  • 박홍제;김경욱
    • Journal of Biosystems Engineering
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    • v.22 no.4
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    • pp.421-432
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    • 1997
  • This study was conducted to investigate dynamic characteristics of agricultural tractor with a particular interest in ride vibrations when it is subjected to various excitation forces. As the first part of it this paper describes development of dynamic model of a tractor-trailer system and its equations of motions. An 3 dimensional 16-degree-of-freedom dynamic model for a tractor-trailer system was developed and its equations of motions were derived, which will be used to investigate the effects of irregular ground surface and excitation forces due to the engine mounted on the tractor. And the excitation forces were also formulated analytically. The transition matrix method and QR algorithm were proposed for numerical solution of the equation of motions fur the developed model. The later parts of the study will include a proof of the model and optimization from which tractors can be designed to minimize the ride vibrations. This will be presented in the second and third papers to be followed shortly.

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Evaluation of Ride Vibration of Agricultural Tractors(II) - Development of a Measurement and Analysis System of Ride Vibrations - (농용 트랙터의 승차(乘車) 진동(振動) 평가에 관한 연구(II) - 승차 진동 측정 및 분석 시스템의 개발 -)

  • Chung, S.S.;Moon, G.S.;Kim, K.U.
    • Journal of Biosystems Engineering
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    • v.17 no.4
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    • pp.326-335
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    • 1992
  • This study was carried out to develop a measurement and analysis system of ride vibrations of tractors. The system consists of a portable digital computer, a PCL-812 PG interface card for A/D conversion, two accelerometers, two signal conditioners, a DC-AC power inverter and a DC power supplier. The computer programs installed in the system for data acquisition and analysis were also developed. It was intended that the system should be cheap enough to be afforded by college laboratories but reliable in its functions of measurement and analysis. Characteristics of the components and methods used in the system development were discussed.

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Initial Design of A Suspension Damper for Truck Driver's Seat (트럭 운전석 현가 댐퍼의 초기설계)

  • Baek, W.K.;Oh, S.W.
    • Journal of Power System Engineering
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    • v.3 no.3
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    • pp.91-96
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    • 1999
  • This study is about the design and analysis ot a suspension damper for truck driver's seat to improve the ride comfort. Trucks are usually subjected to hostile driving environments. Therefore, many truck driver's seat have suspension seats to isolate the vibration from the cab floor panel. Because the vehicle suspension system can reduce the primary vibration from the ground, only low frequency vibration can be transmitted to the driver's seat. But, this low frequency vibration can be harmful to the driver. The seat damper is very critical element to improve the ride comfort for the driver. In this study, a four-stage damper is designed and analyzed for the vibration capability. The damping coefficient of this damper can lie manually controlled in response to the road and driving environment.

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Evaluation of Ride Comfort of the Passenger Vehicle Seat on idle vibration by Virtual Seat Method (Virtual Seat Method를 이용한 승용차량 시트의 정차시 진동에 대한 승차감 평가)

  • Lee, Jae-young;Ahn, Se-jin;Jeong, Wei-bong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2013.04a
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    • pp.780-787
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    • 2013
  • Virtual Seat Method (VSM) is used in this study for a combined evaluation method (objective & subjective) to determine comfort value of passenger vehicle seat in terms of idle vibration. In the study, a process for applying VSM divided into two stages is established. Two kinds of seat mounting passenger vehicle and six subjects are employed to compare the comfort value obtained by VSM method and by SEAT value. As a conclusion, the results by the two methods were well consistent so that VSM is verified as a method to measure ride comfort of seat in terms of idle vibration at passenger vehicle.

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Performance Evaluation of Control Algorithms for 1/2 Tracked Vehicle with Semi-Active Suspension System (1/2 궤도차량에 대한 반능동 현수장치 제어 알고리즘들의 성능평가)

  • 윤일중;임재필;신휘범;이진규;신민재
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.4
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    • pp.139-147
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    • 2001
  • 2 DOF half-car model with 6 semi-active suspension units is utilized to evaluate the tracked vehicle dynamic performance simulated by several suspension control algorithms. The target of this research is to improve the ride comfort to maintain operator's handling capability when the tracked vehicle travels fast on the rough road. The control algorithms for suspension systems, such as full state feedback active, full state feedback semi-active, sky-hook active, sky-hook semi-active, and on-off systems, are evaluated and analyzed in view point of ride comfort. The dynamic performances of vehicle are expressed and evaluated by vibratory characteristic evaluation curves, performance indices and frequency characteristic curves. The simulation results show that the performances of sky-hook algorithms for ride comfort nearly follow those of full state feedback algorithms and on-off algorithm is recommendatory when the vehicle runs relatively fast.

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Automotive Active Suspension Design Using LQG/LTR Method (LQG/LTR 설계방법을 이용한 자동차 현가장치 능동제어)

  • 황재혁;박봉철;백승호
    • Journal of KSNVE
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    • v.3 no.4
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    • pp.383-394
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    • 1993
  • An automotive suspension system generally behaves like a low frequency band-pass filter(0.5 - 10 Hz). Passengers are very sensitive to this frequency range in terms of ride quality and road holding ability. In this paper, a LQG/ LTR controller is suggested to improve the ride quality and road holding ability in the specified frequency rage. It has been found by numerical simulation that the ride quality and road holding ability can be improved in the frequency ranges of 0.5 - 3.0 Hz and 0.3 - 2.1 Hz respectively. In addition, a new approach using root locus to evaluate the stability robustness of the active suspension system is studied. It is shown that the stability robustness of the LQG/LTR controller designed in this paper is improved, compared to the passive system.

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