• Title/Summary/Keyword: Driving type

Search Result 1,502, Processing Time 0.029 seconds

Experimental Analysis to Behavior of Swivel Angle in Bent-axis type Oil Hydraulic Piston Pump for Heavy Vehicle (대형차량용 사축식 유압 피스톤 펌프의 경전각 거동에 따른 실험적 해석)

  • Beak, I.H.;Cho, I.S.;Jung, J.Y.;Oh, S.H.;Jung, S.H.;Jang, D.H.
    • Transactions of The Korea Fluid Power Systems Society
    • /
    • v.7 no.2
    • /
    • pp.13-18
    • /
    • 2010
  • To improve the performance of the bent-axis type axial piston pump driven by the tapered piston, it is necessary to know the driving characteristics and mechanism of the tapered piston and the cylinder block. Since each piston not only rotates on its axis and reciprocates in the cylinder bore, but also revolves around the axis of the driving shaft, it is difficult to analyze the driving mechanism theoretically. The theoretical mechanism for the bent-axis type axial piston pump is studied by using the geometrical method. The driving range of the tapered piston is determined by theoretical equations. The experimental results show that the cylinder block is driven by one tapered piston in a limited range and the core parameters such as driving factor of the piston and the ahead delay angle influenced performance of the bent-axis type axial piston pump.

  • PDF

Finite Element Analysis and Geometric Parameter Optimization for BMT Driving Assembly (BMT 구동장치의 유한요소해석 및 형상변수 최적화)

  • Park, Young-Whan;Kwak, Jae-Seob;Jiating, Yan
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.19 no.2
    • /
    • pp.178-183
    • /
    • 2010
  • Base-mounted type(BMT) driving assembly in CNC machine tools is an indispensable part to improve productivity by reducing tool changeover time and to meet the ever-increasing demand of precision machine tools. This study aimed to perform finite element analysis and geometric parameter optimization to improve the efficiency of BMT driving assembly. First, simulations for three-dimensional structural and vibration analysis were performed using ANSYS/Workbench on the initial geometric models of BMT driving assembly. After analyzing stress and deformation concentration zones, several new geometrical models were designed and evaluated by design of experiments and ANSYS/DesignXplorer. Through a series of analysis-evaluation-modification cycles, it was seen that designed models were effective in determining optimal geometry of BMT driving assembly.

Analysis of Driving Characteristics by Putting Voltage of Charged Particle Type Display Device (대전입자형 디스플레이 소자의 충전전압에 따른 구동특성 분석)

  • Kim, Jin-Sun;Kim, Young-Cho
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.25 no.1
    • /
    • pp.48-52
    • /
    • 2012
  • The charged particle type display device is a kind of the reflectivity type display and shows an image by absorption and reflection of external light source. The charged particle is important factor for driving of the display and quantity of charge per mass of the charged particle determines the driving voltage, contrast ratio, response time, etc. But it is easy for the charged particles to be damaged in the putting process of the display and the damages cause lumping phenomenon of the charged particles. Because the lumping phenomenon makes high driving voltage, low quality of optical properties, short life time, etc, so the charged particles must be filled by stable putting methods. In this paper, we filled the charged particles into the panels by electric fields to improve the electrical and optical characteristics of the display. Also, we analyzed the driving characteristics of the charged particles according to the applied putting voltages.

Selective Reset Waveform using Wide Square Erase Pulse in an ac PDP (AC PDP에서의 대폭소거방식을 이용한 선택적 초기화 파형)

  • Jeong, Dong-Cheol;Whang, Ki-Woong
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.56 no.12
    • /
    • pp.2189-2195
    • /
    • 2007
  • In this paper, we propose a newly developed selective reset waveform of a ac PDP using the wide erase pulse technique with the control of address bias voltage. Although it is generally understood that the wide pulse erasing methode shows the narrow driving margin in an opposite discharge type ac PDP, we could obtain a moderate driving margin in a 3-electrode surface discharge type ac PDP. The obtained driving margin shows a strong dependency on the sustain voltage and the address bias voltage. The lower the sustain and the address bias voltage, the wider the driving margin. The pulse width of the proposed waveform is only $10{\mu}s$, which gives additional time to the sustain period, hence increases the brightness. The brightness and contrast ratio increase about 20% together comparing to the conventional ramp type selective reset waveform with the driving scheme of 10 subfield ADS method. The driving margin was measured with the line by line addressed pattern on the white test panel of 2inch diagonal size and the discharge gas was Ne+Xe4%, 400torr.

A Basic Study on the Route of Shared Self-driving Cars by Type of Transportation Disability person (교통약자 유형별 공유형 자율주행 자동차의 이동경로에 대한 기초연구)

  • Kim, Seon Ju;Kim, Keun Wook;Jang, Won Jun;Jeong, Won Woong;Min, Hyeon Kee
    • The Journal of Information Systems
    • /
    • v.31 no.3
    • /
    • pp.47-65
    • /
    • 2022
  • Purpose With the recent development of Big Data and Artificial Intelligence technology, self-driving technology has developed into three stages (partial self-driving) or four stages (conditional self-driving), it is expected to bring a new paradigm to transportation in the city. Although many researchers are researching related technologies, there is no research on self-driving for disabled persons. In this study, the basic research was conducted based on the assumption that the shared self-driving car used by the disabled person is similar to the special transportation currently driving. Design In this study, data analysis and machine learning techniques were utilized to analyze the mobility patterns of disabled persons by type and to search for leading factors affecting the traffic volume of special transportation. Findings The study found that external physical disorders and developmental disorders often visit general welfare centers, internal organ disorders often visit general hospitals, and the elderly and mental disorders have various destinations. In addition, machine learning analysis showed that the main transportation routes for the disabled person use arterial roads and auxiliary arterial roads and that the ratio of building usage-related variables affecting the use of special transportation for a disabled person is high. In addition, the distance to the subway and bus stops was also mentioned as a meaningful variable. Based on these analysis results, it is expected that the necessary infrastructure for shared self-driving cars for disability person traffic will be used as meaningful research data in the future.

Analysis of arc driving force for 3 petal and 4petal of spiral type vacuum interrupter by FEM analysis (FEM 해석을 통한 Spiral type 진공인터럽터의 전극형상에 따른 아크구동력 비교)

  • Kim, Byoung-Chul;Yoon, Jae-Hun;Hoe, Jun;Kang, Seong-Hwa;Lim, Kee-Joe
    • Proceedings of the KIEE Conference
    • /
    • 2008.04c
    • /
    • pp.245-246
    • /
    • 2008
  • In this paper we calculated and compared the arc driving force of two spiral-tyre vacuum interrupter electrode models which have 3petals and 4petals respectively by means of commercial finite element method software Maxwell 3D. As a result we can find that the more petals the electrode has, the stronger arc driving force was generated. This simulation method can contribute to optimization of spiral-type electrode designs in a view of arc driving force.

  • PDF

Development of Gasoline Direct Swirl Injector II (직접분사식 가솔린 선회분사기 개발에 관한 연구 II)

  • 박용국;이충원
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.9 no.6
    • /
    • pp.76-84
    • /
    • 2001
  • Generally fuel injection system using solenoid have some problems between control signal and mechanical movement like as time lag. Main purpose of the present study is to help the design optimization of GDSI for real engine application. We have adopted two different solenoid driving circuit, namely saturation and pick-hold type and have investigated experimentally the current, needle force, needle opening duration and injection quantity. The pick-hold type driving circuit surpassed a saturation type in the response time and pression control of injection quantity. Accordingly, Using characterization data of operating factors such as time constant, driving force and so on, can be evaluated and adjusted to obtain an optimum injector performance.

  • PDF

Pattern Design and Driving of a Charged Particle Type Display (대전입자형 디스플레이의 패턴 설계 및 구동)

  • Kwon, Ki-Young;Kim, Sung-Woon;Hwang, In-Sung;Kim, Chul-Ju;Kim, Young-Cho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2007.06a
    • /
    • pp.53-54
    • /
    • 2007
  • Charged particle type display using particles which have opposite charge and color is based on effect of reversible optical property due to electric field. we designed mask pattern for fabrication of the charged particle type display based on glass substrate and investigated cell gap dependent of driving voltage and selectively driving method. the panel driven by our selectively driving method, we could obtain image which had vary little crosstalk caused by electrical interference and conform the last image maintained by memory effect without additional voltage.

  • PDF

Determination of Driving States using the Driving Characteristics Index (주행특성지수를 이용한 차량 주행상태 판별)

  • Joo, Da-Ni;Moon, Sang-Chan;Lee, Soon-Geul
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.21 no.3
    • /
    • pp.210-216
    • /
    • 2015
  • This paper proposes a method to determine vehicle driving state using the driving characteristics index. This index is a quantitative value to classify the driving state of a vehicle with its velocity and heading angle in that instant. It can classify driving state into straight driving, lane changing driving and curve driving in real time. In addition, the number of positional information is movably set up by designed region of interest. The proposed index is expressed on the stable driving states. Each driving state has characteristic tendency, and is compared with index distributional areas. The proposed method is verified by the actual driving experiment on the KATECH proving ground.

Real-time Dangerous Driving Behavior Analysis Utilizing the Digital Tachograph and Smartphone

  • Kang, Joon-Gyu;Kim, Yoo-Won;Jun, Moon-Seog
    • Journal of the Korea Society of Computer and Information
    • /
    • v.20 no.12
    • /
    • pp.37-44
    • /
    • 2015
  • In this paper, we propose the assistance method to enable safe driving through analysis of dangerous driving behavior using real-time alarm by vehicle speed, azimuth data and smartphone. For this method, smartphone is receiving driving data from digital tachograph using communication. Safe driving habit is a very important issue to commercial vehicle because that driver's long time driving than other vehicle type driver. Existing methods are very inefficient to improve immediately dangerous driving habits during driving because proceed driving behavior analysis after the vehicle operation. We propose the new safe driving assistance method that can prevent traffic accidents by real-time and improve the driver's wrong driving habits through real-time dangerous driving behavior analysis and notification the result to the driver. We have confirmed that the method in this paper will help to improve driving habits and can be applied through the proposed method implementation and simulation experiment.