• 제목/요약/키워드: travelling speed

검색결과 109건 처리시간 0.023초

미지의 외란을 고려한 도시철도차량의 ATO를 위한 연구 (The Study on ATO of Urban Railway Considering Unknown Disturbance)

  • 변윤섭;한성호;김길동;이병송;한영재;백종현;박현준
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 A
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    • pp.421-423
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    • 1999
  • The function of the automatic train operation(ATO) system is to regulate the train ride comfort during start, acceleration and deceleration and execute operation of constant speed travelling and fixed point parking. The mathematical model for the train is presented by considering unknown disturbances which consist of start resistance, travelling resistance, slope resistance, curve resistance and so on. The speed control of ATO system is designed by considering the disturbances. The simulation is executed to verify the speed control performance and compare its performance with that of a PID-type ATO control system under the disturbances. Simulation results show that the control performance of gain scheduled control for ATO system is better than that of the conventional PID controller.

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진행파를 이용한 근접사고 거리계전 방식 (Travelling Wave Technique for Close-Up Fault Protection)

  • 김곤욱;강상희;박종근;김일동;윤만철;권욱현
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1990년도 추계학술대회 논문집 학회본부
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    • pp.202-205
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    • 1990
  • In this paper the development of new technique based on the travelling-wave information contained in the post fault voltage and current signals has been presented. To develop fault location methods which can cope with close-up fault and zero-inception angle problems, magnitude of the backward wave has been used. The technique developed can be incorporated in a generalized algorithm for application as a high speed distance scheme. In this way some of the problems and limitations associated with travelling wave schemes are avoided. Verification of the relay operating principles is presented through digital computer numerical simulation using an electromagnetic transient program(EMTP) in conjunction with simulation of the proposed algorithms.

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휴반용 분무기의 Nozzle에 관한 연구(II) (A Study on the Wide Reach Nozzle of Sprayer (ll))

  • 원장우
    • 한국농공학회지
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    • 제15권3호
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    • pp.3053-3058
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    • 1973
  • 1. This study was conducted to examine the effects of change of the short range nozzle hole on the travelling distance. The results of this study are summarized as follows; a) Effect of change of the cap hole diameter on the travelling distance of sprayed particles was generally a linear, the increasing rate was about 0.27. b) When the difference between the sectional area of cap hole and that of grooves of swirl plate, was small the travelling distance was decreased by the decreasing of spraying speed at cap hole. 2. This study was conducted to examine the effects of change of the short range nozzle hole on the size of spraying particles. The results of this study are summarized as follows; a) The diameter of sprayed particles on travelling distances in the short range nozzle did not coincide with the kinetic energy principle derived from the momentum and the resistance. b) The average diameter of sprayed particle between 1m and 3m in which amount of sprayed particle was particularly a great deal, was big, because that some of sprayed particles were absorbed each other on the way to fall c) Effect of increase of cap hole diameter was generally enlarged the average diameter of sprayed particle with small rate.

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터널에서의 고속차량 차내 소음 특성 (Characteristics of Interior Noise of High Speed Trains in Tunnels)

  • 이찬우;김재철
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2005년도 춘계학술대회 논문집
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    • pp.479-484
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    • 2005
  • Comparison it analyed the tunnel travelling hour interior noise arresting quality of the inside and outside of the country high-speed vehicle from the research which it sees. In the interior sound arresting comparison objective vehicle of the tunnel travelling hour KTX vehicle from the research which it sees and it limited by the TGV vehicle of France and the ICE vehicle og Germany and the Shinkansen vehicle of Japan comparison it analyzed the interior sound arresting from the open field and the tunnel line. The tunnel passage hour interior sound arresting problem of the domestic KTX vehicle follows in the concreate track tunnel the ballast track tunnel and the interior sound arresting quality is appearing different.

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진행파를 이용한 소형 디스크타입 초음파 모터의 시작과 특성 (The Trial Fabrication and Properties of Small-size Disk-Type Ultrasonic Motor Using Travelling wave)

  • 박철현;이종섭;이강원;정수현;채홍인;임기조
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1999년도 춘계학술대회 논문집
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    • pp.669-672
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    • 1999
  • In this paper, we studied the properties of small-size disk-type ultrasonic motor using travelling wave for the application to the precise control robotic joint motor and fabricated it. The diameter of the ultrasonic motor fabricated was 13mm. Also, the piezoelectric vibrator was constructed by piezoelectric ceramic and elastic material. The piezoelectric ceramic was composed to PZ-PT-PMN which was shown the high electromechanical stability under high vibration level and stainless steel was used as the elastic material in which configuration was disk-type. To conform the capability of application to robotic motor, we measured the change of rotational speed according to applied voltage and applied frequency. As the results, the small-size disk-type ultrasonic motor was able to fabricate, and the revolution speed was 350 (rpm) when input voltage was 55 (Vrms) and applied frequency 160.4 IkHz] under pre-load.

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Power analysis of electric transplanter by planting distances

  • Lee, Pa-Ul;So, Jin-Hwan;Nam, Yo-Sang;Choi, Chang-Hyun;Noh, Hyun-Seok;Shim, Jong-Yeal;Hong, Soon-Jung
    • 농업과학연구
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    • 제45권2호
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    • pp.290-297
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    • 2018
  • Electric drive technology is continually advanced to improve fuel efficiency in the automobile industry. It could improve the fuel efficiency of automobiles by 50% as well as agricultural machinery. The purpose of this study was to measure and analyze the power and current of an electric transplanter based on the planting distances during field operations. The electric transplanter was constructed by mounting the major components of a motor drive system onto a transplanter. The electric transplanter had a 3 kW motor power, and the major components included an inverter, battery, and a battery management system (BMS). The field tests were conducted by travelling at two speeds (300 and 760 mm/s) and by planting at three distances (260, 420 and 630 mm) with the working speed (300 mm/s), during travelling and transplanting. The results showed that the required power increased when the travelling speed was fast. One-way ANOVA for the planting distance and Duncan's multiple range test at a significance level of 0.05 were used to analyze the motor power using statistical analysis software. In addition, the required power increased when the planting distances were short at every working condition. The results of this study would provide useful information for the development an electric transplanter.

GPS를 이용한 연속류 통행차량의 속도차와 차두간격 변화에 대한 해석 (Analysis on the Variation for Speed Difference and Spacing of Travel Vehicles in Uninterrupted Flow using GPS)

  • 김재석;이상관;우용한
    • 한국지리정보학회지
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    • 제4권3호
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    • pp.51-60
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    • 2001
  • GPS를 이용하여 차량의 통행과 관련된 행태를 미시적으로 분석할 수 있다. 2대의 시험차량에 GPS장비를 탑재하고 통행함으로서 순간적으로 발생하는 통행특성을 파악할 수 있기 때문이다. 연속류에 있어서 선행차량과 추종차량의 속도차이와 차두간격의 변화는 용량 및 안전과 관련된 중요한 변수이다. 본 연구는 국도 4호선과 28호선을 통행하면서 수집된 자료를 이용하여 이들을 분석하였다. 주행시의 속도차이에 대한 변화의 폭은 3.0%이내로 경미하였다. 하지만, 가 감속시의 속도차이는 시작 직후보다 4초 정도 경과한 뒤의 차이가 더 큰 것으로 나타났다. 차두간격도 이와 비슷한 변화를 나타내었다. 이와는 별개로 안전성을 고려한 감속 직전의 차두간격에 대해서도 분석하였다. 모형에 의한 이론치와 실측치를 비교하였는데, 실측치가 평균 12.52% 더 짧은 것으로 분석되었다. 이로써 시험대상구간에서 운전한 추종차량은 선행차량의 급감속시 추돌사고를 야기할 가능성이 높음을 알 수 있다.

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Wave Patterns Due to a Point Impulse Travelling over Free Surface of Water of Finite Depth

  • Lee, G.J.;Chung, Y.K.
    • Journal of Hydrospace Technology
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    • 제2권1호
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    • pp.10-17
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    • 1996
  • If a point impulse travels over free surface of water of finite depth, surface waves consist of divergent waves. The crestlines of those divergent waves are short and end on the cusp line if the impulse travels at a subcritical speed. But the crestlines become infinitely long and there are no cusps if the impulse travels at a supercritical speed.

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Dynamic response of size-dependent porous functionally graded beams under thermal and moving load using a numerical approach

  • Fenjan, Raad M.;Ahmed, Ridha A.;Faleh, Nadhim M.;Hani, Fatima Masood
    • Structural Monitoring and Maintenance
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    • 제7권2호
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    • pp.69-84
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    • 2020
  • Based on differential quadrature method (DQM) and nonlocal strain gradient theory (NSGT), forced vibrations of a porous functionally graded (FG) scale-dependent beam in thermal environments have been investigated in this study. The nanobeam is assumed to be in contact with a moving point load. NSGT contains nonlocal stress field impacts together with the microstructure-dependent strains gradient impacts. The nano-size beam is constructed by functionally graded materials (FGMs) containing even and un-even pore dispersions within the material texture. The gradual material characteristics based upon pore effects have been characterized using refined power-law functions. Dynamical deflections of the nano-size beam have been calculated using DQM and Laplace transform technique. The prominence of temperature rise, nonlocal factor, strain gradient factor, travelling load speed, pore factor/distribution and elastic substrate on forced vibrational behaviors of nano-size beams have been explored.