• 제목/요약/키워드: Driving type

검색결과 1,503건 처리시간 0.031초

드라이빙 시뮬레이터 주행과 현장주행시 운전자 반응 비교 연구 (Comparative Study on Difference in Driver's Workload between Driving Simulator and Field Driving in Tunnel, Highway)

  • 김현진;김주영;최경임;주재홍;오철
    • 한국도로학회논문집
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    • 제19권6호
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    • pp.139-145
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    • 2017
  • PURPOSES : This study analyzed the difference in a driver's workload between using a driving simulator and field driving in tunnel, highway. METHODS : Based on the literature review, it was found that a driver's workload could be quantified using biosignals. This study analyzed the biosignal data of 30 participants using data collected while they were using a driving simulator and during a field test involving tunnel driving. Relative energy parameter was used for biosignal analysis. RESULTS : The driver's workload was different between the driving simulator and field driving in tunnels, highway. Compared with the driving simulator test, the driver's workload exhibited high value in field driving. This result was significant at the 0.05 level. The same result was observed before the tunnel entrance section and 200 m after the entrance section. CONCLUSIONS : This study demonstrates the driving simulator effect that drivers feel safer and more comfortable using a driving simulator than during a field test. Future studies should be designed considering the result of this study, age, type of simulator, study site and so on.

Fatigue Crack Retardation and Retardation Mechanism in Variable Loading (The Effects of Crack Tip Branching in Crack Growth Retardation)

  • Song, Sam-Hong;Kwon, Yun-Ki
    • International Journal of Precision Engineering and Manufacturing
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    • 제3권3호
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    • pp.76-81
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    • 2002
  • In order to study the fatigue crack and retardation mechanism in variable loading, the effects of crack tip branching in crack growth retardation were examined. The characteristics of crack tip branching behavior were considered with respect to microstructure and crack tip branching angle was examined. Crack tip branching was observed along the grain boundary of finite and pearlite structure. It was found that the branching angle ranges from 25 to 53 degrees. Using the finite element method, the variable of crack driving farce to branching angle was examined. The effective crack driving farce (K$\_$eff/) decreased as the branching angle increased. The rate of decrease was 33% for kinked type and 29% for forked one. It was confirmed that the effect of crack tip branching is a very important factor in crack growth retardation. Therefore, crack branching effect should be considered in building the hypothetical model to predict crack growth retardation.

기어구동방식의 자동윤활주유장치 개발 (Development of Gear Driving Type Using the Automatic Grease Lubricator)

  • 이규영;왕덕현;김원일
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.1589-1592
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    • 2003
  • Automatic grease lubricator of gear type was developed by mechanical design, analysis and test with products manufactured by rapid prototyping machine. The mechanism of gear driving was designed in similar to the watch mechanism and lubrication could be controlled by PCB circuit. The body of the lubricator was analyzed by stress analysis with different constructed angle. Digital mockup was analyzed and RP products were combined with PCB circuit and grease. RP products and injection moulding products were tested and compared for roughness and roundness, Finally the grease was drained out for testing the time.

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탄성 다물체 해석기법을 이용한 크롤러형 건설장비의 주행 및 선회 동특성 해석 (Driving and Swing Analysis of a Crawler Type Construction Equipment Using Flexible Multibody Dynamics)

  • 김형근;서민석
    • 한국자동차공학회논문집
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    • 제5권1호
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    • pp.101-109
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    • 1997
  • A tool for the dynamic simulation and design technique of the excavator plays an important role in the prediction of dynamic behavior of the excavator in the initial design stage. In this paper, a flexible multibody dynamic analysis model including track of the crawler type excavator is developed using DADS and ANSYS. Through the driving simulation of the excavator travelling over rough road track, frequency characteristics of the upper frame and cabin are obtained, and the reaction forces acting on the track rollers are also presented for the fatigue life estimation. The effect of boom vibration modes on the joint reaction forces and accelerations is presented from the swing simulation.

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솔레노이드 구동 수소인젝터의 성능특성 (Characteristics of Solenoid Actuated Hydrogen Injector)

  • 이형승;김한조;김응서
    • 한국자동차공학회논문집
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    • 제3권6호
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    • pp.134-144
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    • 1995
  • The solenoid actuated hydrogen injector and the capacitive peak-hold type driving circuit were designed and made, and the hydrogen supply system for in-cylinder injection was constructed with these. The performance of the injector was investigated through measuring the pintle lift profiles and the injection quantities, and the performance of the hydrogen supply system was confirmed through the experiments at the single cylinder engine. The injection quantity increased linearly as the duration of driving signal increased. At the single cylinder engine, the hydrogen injector was operated stably. The hydrogen flow rate of the injector with the peak-hold type driving circuit could be controlled precisely at high engine speed or low load condition only with the variation of signal duration.

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축방향 이중 회전자 브러시리스 직류 전동기의 센서리스 구동에 관한 연구 (A Study of Sensorless Driving for The Axial Type Double Rotor Brushless DC Motor)

  • 원재선;강태삼;홍선기
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
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    • pp.168-170
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    • 1998
  • In this paper a driving method using the microcomputer in safe driving the axial type double rotor brushless DC motor without shaft position sensor is studied. The rotor position is determined from the back-EMF passed though special filter. Starting technique which uses the motor as a synchronous motor at standstill are explained. The motor speed is controlled by changing the duty cycle of PWM. The test motor has Y-connected three-phase stator and 8-pole axial type double rotor. From the experiments, we got good performences of the proposed control system.

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소형차 배출가스 시험방법 국제 표준화를 위한 국내 주행패턴 연구 (Research on Domestic Driving Pattern for International Standardization of Light-duty Vehicles Emission Test Method)

  • 최기주;박준홍;이종태;김정수;이규진;이용주
    • 대한교통학회지
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    • 제30권1호
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    • pp.31-43
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    • 2012
  • 한국이 UN 자동차 법규 표준화 기구(WP29) 주관의 소형차 배출가스 시험방법 국제 표준화(WLTP/DHC) 연구에 참여하게 됨에 따라 우리나라의 도로 종류 별, 주행 시간대 별 주행패턴 측정이 요구되었다. 이에 본 연구에서는 WP29에서 제안한 주행패턴 표준화 방법을 토대로, 우리나라의 도로 교통 특성을 반영한 실 도로 주행패턴을 측정하고, 대표성을 갖는 도로 종류 별 주행 시간대별 총 7가지 유형의 주행패턴을 분석하였다. 이를 위해 이동식 차량활동도 모니터링 장비(PAMS)를 이용하여 35,410km의 실주행자료를 수집하였으며, 각 유형별로 분석된 주행패턴은 서로 유의한 차이가 있는 것으로 나타났다.

초음파 모터의 구동 특성 (The Driving Characteristics of Ultrasonic Motor)

  • 최정석;백수현;김용;윤신용;최철용;김일남
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 B
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    • pp.783-785
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    • 2002
  • In this paper, the driving characteristic for a ring type ultrasonic motor is described. For driving of ultrasonic motor, a two-phase parallel-resonant inverter was made. The driving circuit simulation results are compared with measured frequencis and amplitudes.

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초음파 모터의 2상 정현파 구동특성 (The Driving Characteristics of Two-Phase Sinusoidal in Ultrasonic motor)

  • 최정석;백수현;김용;윤신용;최철용
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.100-102
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    • 2002
  • In this paper the driving characteristic for a traveling-wave type ultrasonic motor is described. For driving of ultrasonic motor, a two-phase resonant inverter and Digital IC was made. The driving circuit simulation results are compared with measured frequencis and amplitudes.

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Y형 밸런싱 트랜스포머를 적용한 AC초퍼 LED 구동 시스템 (The AC Chopper LED Driving System Using The Y Type Balancing Transformer)

  • 김진구;유진완;김용하;박종연
    • 조명전기설비학회논문지
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    • 제29권3호
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    • pp.22-29
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    • 2015
  • The AC-LED driving system which is connected directly to alternative current source is suitable for commercialization because of it's simple structure and low cost. However, it requires additional circuits compensating for current differences between the parallel connected LED strings. In this paper, we proposed the circuit compensating for current error of the three LED strings using the Y type balancing transformer. The proposed Half-bridge AC Chopper LED driving system used the ferrite material's balancing transformer. at the same time, it is able to dimming control. The proposed system is applied to 80W AC-LED module consist of three parallel strings. Experiment results present that Power factor and THD measured with power analyzer are 0.958 and 26.473% respectively satisfied with IEC61000-3-2 harmonics standard.