• Title/Summary/Keyword: Driving Part

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Lane Departure Warning Algorithm Through Single Lane Extraction and Center Point Analysis (단일차선추출 및 중심점 분석을 통한 차선이탈검출 알고리즘)

  • Bae, Jung-Ho;Kim, Soo-Woong;Lee, Hae-Yeoun;Lee, Hyun-Ah;Kim, Byeong-Man
    • The KIPS Transactions:PartB
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    • v.16B no.1
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    • pp.35-46
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    • 2009
  • Lane extraction and lane departure warning algorithms using the image sensor attached in the vehicle are addressed. With the research about intelligent automobile, there have been many algorithms about lane recognition and lane departure warning system. However, since these algorithms require to detect 2 lanes, the high time complexity and the low recognition rate under various driving circumstances are critical problems. In this paper, we present a lane departure warning algorithm using single lane extraction and center point analysis that achieves the fast processing time and high detection rate. From the geometry between camera and objects, the region of interest (ROI) is determined and splitted into two parts. Hough transform detects the part of the lane. After the detected lane is restored to have a pre-determined size, lane departure is estimated by calculating the distance from the center point. On real driving environments, the presented algorithm is compared with previous algorithms. Experiment results support that the presented algorithm is fast and accurate.

Underwater Drone Development for Ship Inspection Part 1: Design, Production and Testing (선박 검사용 수중 드론 개발 Part 1: 설계·제작 및 시험)

  • Ha, Yeon-Chul;Kim, Jin-Woo;Kim, Goo;Jeong, Kyeong-Teak;Choi, Hyun-Deuk
    • Journal of the Institute of Convergence Signal Processing
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    • v.21 no.1
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    • pp.38-48
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    • 2020
  • In order to inspect the existing or newly constructed ship's hull, a professional diver directly inspects the ship's bottom of the water. However, since it is a work done by people, there are many dangers such as human casualties and crashes. To solve this problem, it is necessary to develop underwater drones for ship inspection for visual inspection. The technology applied to underwater drones, the use and manufacturing process of each component, and the method of manufacture such as firmware development were described, and the difference was compared by measuring the drone's own driving ability and driving ability using crawler under water, and the location tracking device test confirmed the error from the actual location. It is estimated that the use of underwater drones produced through this research will prevent human casualties and achieve economic effects and stability.

A Study on the Stick-Slip Phenomenon of the Driveline System of a Vehicle in Consideration of Friction (마찰을 고려한 차량 동력전달계의 Stick-Slip 현상에 관한 연구)

  • 윤영진;홍동표;정태진
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.4
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    • pp.19-29
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    • 1995
  • This paper discusses the stick-slip phenomenon of the driveline system of a vehicle in consideration of friction. Friction is operated on the between of flywheel and clutch disk. The expressions for obtaining the results have been derived from the equation of motion of a three degree of freedom frictional torsion vibration system which is made up driving part(engine, flywheel), driven part(clutch, transmission) and dynamic load part(vehicle body) by applying forth-order Rungekutta method. It was found that the great affect parameters of the stick-slip or stick motion were surface pressure force between flywheel and clutch disk, time decay parameter of surface pressure force and 1st torsional spring constant of clutch disk when driveline system had been affected by friction force. The results of this study can be used as basic design data of the clutch system for the ride quality improvement of a car.

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The Study on the Development of the Car Driver's Front Attention Enhancement System using the Car Camera (차량카메라 영상을 이용한 운전자 전방 주의력향상 시스템 개발에 관한 연구)

  • Lee, Sang-Ha;Shim, Min Kyung
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.67 no.2
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    • pp.75-81
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    • 2018
  • In this paper for developing and implementing the car driver's front lane attention enhancement developed system using the car camera. The developed system automatically alarm the car driver when front cars make the dangerous situation. We use Raspberry Pi camera module V2 as car camera module, Raspberry Pi 3 board as hardware main board of implementing embedded system and develop the application library module which can be operated on the Raspberry situation. The application library module widely consist of two part, front car recognition part and dangerous situation distinguish part. Our developed system satisfy the performance test of the target system at the software test certification laboratory of TTA(Telecommunication Technology Association). We test four items as attentive car recognition ability at day and night, system performance, response time. We get the performance of developed system based on the four goal. The car driver's front lane attention enhancement system in this paper will be widely used at the ADAS(Advanced Driving Assistance System) because of the better performance and function.

A Study on a Novel Flow Control Valve for Wind Power Heat Generation Hydraulic Systems (풍력 열발생 유압 시스템을 위한 새로운 유량제어밸브에 관한 연구)

  • Choi, Sae Ryung;Lee, Ill Yeong;Han, Bong Jun
    • Journal of Drive and Control
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    • v.14 no.1
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    • pp.23-28
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    • 2017
  • A wind power heat generation system that converts wind power directly to heat instead of electric power is considered in this study. The system consists of a wind turbine part and a heat generation part. The heat generation part is materialized by a hydraulic system including a hydraulic pump, a flow control valve, a hydraulic oil tank, etc. The flow control valve primarily converts hydraulic energy generated in the pump to heat energy. It should have a function of overspeed protection under excessive wind speeds. In this study, a novel flow control valve design is proposed for excellent flow control characteristics under excessive pump driving torque (excessive wind speed). The performance of the suggested valve is analyzed using numerical simulation.

Optimal Design of the Mover Considering the Electrical Characteristic of Linear Motor

  • Lee, Jung-Myung;Han, Dong-Seop;Lee, Seong-Wook;An, Tae-Won;Han, Geun-Jo
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.2
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    • pp.321-324
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    • 2006
  • LMTT(Linear Motor based Transfer Technology) is a new type of transfer system used in the maritime container terminal for the port automation, and largely consists of a controller, shuttle car, and rail. The shuttle car is divided into the frame part, the driving part, and wheels. In order to design this system, various researches on each part of it must be conducted. In this study, we dealt with the optimum design for the mover of the shuttle car designed from previous studies on the strength of the frame with respect to the number of cross beams to minimize the weight of the shuttle car and to satisfy design criteria of cargo-handling systems in container terminal. For the optimization of the mover, thicknesses of each beam were adopted as design variables, the weight of the frame as objective function, and stress and deflection per unit length as constraint condition.

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Performance Investigation of Rotary Discharge Machine by Analytical Method (해석적 방법을 통한 Rotary Discharge Machine 의 성능 분석)

  • Jeong, Yeon Ho;Jung, Dae Man;Lee, Kwon Jae;Cho, Young Tae;Jung, Yoon Gyo
    • Journal of the Korean Society for Precision Engineering
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    • v.33 no.12
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    • pp.965-970
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    • 2016
  • Fuel used in the steel metallurgy industry is stored in huge stage systems called SILO. Fuel is released by RDM (Rotary Discharge Machine), at the place of utilization. RDM is located in the Silo, and is constituted of a main frame, driving part, discharging part and control part. RDM is combined to a direct motion on the rail in tunnel, having a rotary motion enabled by a motor. In this paper, we calculate the theoretical discharging capacity of RDM to confirm the correlation between design element and discharging capacity of RDM. Also, through structure analysis, we confirm the vulnerable point of RDM when it discharges the storage materials. We hope to apply these results to design a more efficient RDM.

Speed-Sensorless Torque Monitoring on CNC Lathe using Internet (인터넷을 이용한 CNC 선반의 속도 센서리스 토크감시)

  • 홍익준;권원태
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.5
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    • pp.99-105
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    • 2004
  • Internet provides the useful method to monitor the current states of the machine tool no matter where a personnel monitors it. In this paper, a monitoring method of the torque of the machine tool's spindle induction motor using interne is suggested. To estimate the torque accurately, spindle driving system of an CNC lathe is divide into two parts, induction motor part and mechanical part attached to the induction motor spindle. Magnetizing current is calculated from the measured 3 phase currents without speed sensor used to estimate the torque generated by an induction motor. In mechanical part of the system, some of the torque is used to overcome friction and remaining torque is used to overcome cutting force. An equation to estimate friction torque is drawn as a function of cutting torque and rotation speed. Graphical programming is used to implement the suggested algorithm. to monitor the torque of an induction motor in real time and to make the estimated torque monitored on client computers. Torque of the spindle induction motor is well monitored on the client computers in about 3% error range under various cutting conditions.

DYNAMIC SIMULATION MODEL OF A HYBRID POWERTRAIN AND CONTROLLER USING CO-SIMULATION-PART II: CONTROL STRATEGY

  • Cho, B.;Vaughan, N.D.
    • International Journal of Automotive Technology
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    • v.7 no.7
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    • pp.785-793
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    • 2006
  • The topic of this study is the control strategy of a mild hybrid electric vehicle (HEV) equipped with a continuously variable transmission (CVT). A brief powertrain and vehicle configuration is introduced followed by the control strategy of the HEV with emphasis on two key parts. One of them is an ideal operating surface (IOS) that operates the CVT powertrain optimally from the viewpoint of the tank-to-wheel efficiency. The other is a charge sustaining energy management to maintain the battery state of charge (SOC) within an appropriate level. The fuel economy simulation results of the HEV over standard driving cycles were compared with those of the baseline vehicle. Depending on the driving cycle, 1.3-20% fuel saving potential is predicted by the mild hybridisation using an integrated starter alternator (ISA). The detailed energy flow analysis shows that the majority of the improvement comes from the idle stop function and the benefits for electrical accessories. Additionally, the differences between the initial and the final SOC are in the range 1.0+3.8 in the examined cycle.

The Nonlinear Simulation on the Selection of Suitable Suspension Considering Human Vibration (인체 진동을 고려한 최적 현가장치의 선정에 관한 비선형 모의실험)

  • 김진기;홍동표;최만용
    • Journal of KSNVE
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    • v.10 no.2
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    • pp.247-253
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    • 2000
  • The evaluation of the ride quality had been performed by the subjective method before ISO2631(International Organization for Stadard 2631) and BS6841(British Standard 6841) was precented, but many research programs have been performed by the objective method after that. On this study, the ride quality was evaluated related with the objective method which considered the vibration which the human body feels on the driver's seat while driving on the road. In particular, we made the shock absorber nonlinear model and also selected the suitable shock absorber in the part of the vibration which the human body feels into the simulation. The shock absorber of suspension was dealt with 3 cases respectively with the front wheel and rear wheel. The vibration of the car driving on the road can be transferred to the wheel, the suspension, the vehicle body, the seat and the human body. The signal which was gained from the seat(hip) and the floor(foot) of the human body was changed to the vibration signal which the human body felt through using the frequency weighting function. And then the performance of the shock absorber was calculated through the statistic processing.

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