• Title/Summary/Keyword: Articulated Vehicles

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Turning characteristics of articulated vehicles related to geometric design (기하학적 디자인과 관련한 굴절차량의 선회 특성 검토)

  • Moon, Kyeong-Ho;Mok, Jai-Kyun;Chang, Se-Ky;Kim, Yeon-Su;Lee, Soo-Ho
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.698-704
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    • 2007
  • Articulated vehicles which have a pivoting joint allowing the vehicle to rotate more easily are difficult to turn the curves because of their long length. In order to review operational safety, turning characteristics related to geometric design should be investigated when articulated vehicles run on the road which can be interfered with other vehicles. The vehicles to review the turning characteristics are the normal articulated bus in Seoul with FWS(front wheel steering) and new bimodal tram with AWS(all wheel steering). Steering characteristics and geometric design were investigated such as turning radius, offtracking, swept path width and swingout. The results were reviewed with respect to the standards of vehicle safety and road design.

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Development of Design method and Evaluation technology for Driving Gear Unit of Articulated Vehicles (굴절차량의 감속구동장치 연구개발 성과)

  • Lee, Min-Soo;Kim, Tea-Hyung;Kim, Jin-Wan;Kim, Yong-Kee
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.13-19
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    • 2007
  • This study is to establish design method and evaluation technology for drive system appropriate to articulated vehicles. The transmission system of articulated vehicles serves in the other condition compared with those of commercial vehicles, namely, they have to transmit high power to run and they have to make maximum use of the limited space. This paper reports the reviews and results of the design and evaluation method for driving gear unit of articulated vehicles and discusses various design items and methods about assembly and parts of driving gear unit.

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Development and Verification of the Steering Algorithm for Articulated Vehicles (굴절차량에 대한 조향알고리즘 개발 및 검증)

  • Moon, Kyeong-Ho;Lee, Soo-Ho;Mok, Jai-Kyun;Park, Tae-Won
    • Journal of the Korean Society for Railway
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    • v.11 no.3
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    • pp.225-232
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    • 2008
  • AWS (all wheel steering) is applied to improve the stability and the turning performance. Most automotive cars are mainly controlled by FWS (front wheel steering) system except some cars which are made to improve their stability by using AWS. Articulated vehicles with a pivoting joint for easy turn are difficult to make a sharp turn because of the long body and long wheelbase. Therefore applying AWS to the articulated vehicles is effective to reduce the turning radius. The AWS control method for the articulated vehicles is currently applied to only Phileas vehicles which were developed by APTS. The paper on the design of a controller to guide an articulated vehicle along the path was published but control algorithm for manual driving has not been reported. In the present paper, steering, characteristics of the Phileas vehicles have been analyzed and then new algorithm has been proposed. To verify the AWS algorithm, Commercial S/W, ADAMS was used for validity of the dynamic model and algorithm.

Reduced Order Luenberger State Observer Design for the Jackknifing Phenomenon Prevention of Articulated Vehicles using GPS (위성항법시스템을 이용한 연결식 차량의 잭나이핑 현상 예방을 위한 축소차수 상태관측기 설계)

  • Lee, Byung-Seok;Heo, Moon-Beom
    • Journal of Institute of Control, Robotics and Systems
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    • v.18 no.7
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    • pp.688-698
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    • 2012
  • This paper deals with ROLSO (Reduced Order Luenberger State Observer) design to prevent jackknifing phenomenon of articulated vehicles consisting of the tractor and semi-trailer by using GPS. In addition, by applying the regulator system using ROLSO feedback system, simulation's result presents that articulated vehicle's states are stabilized than the human's PR time (Preception Response time) rapidly. This simulation verifies that the automatic control of articulated vehicle's can be applied for the accident prevention for the time that the driver is unable to manage with the sudden accident. For this simulation, by using the equation of planar motion, the modeling of the articulated vehicle was performed. This modeling was expressed in the state space model. And FOLSO (Full Order Luenberger State Observer), ROLSO were designed by using the state space model of an articulated vehicle's dynamics.

A Study on the Factors that Influence Jack Knife Phenomenon of Articulated Vehicles (연결(連結) 차량(車輛)의 재크나이프 현상에 영향(影響)을 미치는 인자(因子)인자에 대한 연구)

  • Kang, D.M.;Ahn, S.M.
    • Journal of Power System Engineering
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    • v.11 no.2
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    • pp.58-63
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    • 2007
  • Vehicular safety and occupant injury have been of considerable interest to the public. The dynamic response of an articulated vehicle is different from that of single body vehicle due to its geometric and inertia properties. Articulated vehicles have the tendency to jackknife if they lose driving safety. Influence of factors for driving safety of an articulated vehicle(Tractor-Semitrailers) has been analysed by the EDVTS, a kinetic analysis program for an articulated vehicle. EDVTS permits an analyst to investigate the effect of many variables in a short period of time, and enables to obtain an accurate explanation of driving safety. The factors used in the analysis include the load, friction coefficient, tire flat, increase of braking force, and trailer geometry. Based on the results, the articulation angle and driving safety were influenced remarkably by the load, coefficient of friction, increase of braking force. However, trailer geometry, such as length and width, did not affect articulation angle and driving safety

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Torque Distribution Algorithm of Independent Drive Articulated Vehicle for Small Radius Turning Performance (독립 구동 굴절차량의 회전반경 감소를 위한 토크분배 알고리즘)

  • Lee, Kibeom;Hwang, Karam;Tak, Junyoung;Suh, In-Soo
    • Journal of the Korean Society for Railway
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    • v.17 no.5
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    • pp.336-341
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    • 2014
  • The articulated structures seen in train or tram applications are being applied in road transportation systems, for use in mass passenger transit. When articulated vehicles are driven on public roads, they no longer follow a guided track. Therefore, there are a lot of control elements that need to be considered, such as turning radius, swept path width, off-tracking, and swing-out. Some of the currently available articulated vehicles on roads are equipped with an independent drive system; a system that has one motor at each wheel. Through this drive system, each wheel can be independently controlled, making precise and quick dynamic stability control possible. In this paper, we propose a torque distribution algorithm that can reduce the overall turning radius of the articulated vehicle, which has been verified through dynamic simulation.

Sensitivity Analysis of Suspension Elements of an Articulated Bogie for Light Railway Vehicles (경량전철용 관절대차 현가요소의 민감도 해석)

  • Han, Hyung-Suk;Hur, Shin;Ham Sung-Do;Cho, Dong-Hyun
    • Proceedings of the KSR Conference
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    • 1998.11a
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    • pp.421-428
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    • 1998
  • Sensitivity analysis of suspension elements of an articulated bogie for light railway vehicles is presented. The ride, stability and safety are used as dynamic performance index. Suspension elements of 10 and a conicity of wheel are used as design variables, To analyze sensitivity of design variables, the railway vehicle dynamics analysis program AGEM is used. The results shows that the secondary suspension elements have a strong effect on ride and the primary suspension elements have a moderate effect on ride. Conicity of wheel has a strong effect on the stability, The safety is not effected by all the design variables.

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A Study on Wheel Design for a Self-Propelled Boom Sprayer considering the Rice Plant Damage and Wheel Track-Plant Damage Simulation of Various Steering Vehicles (수도작용 자주식 붐방제기의 작물손상을 고려한 차륜설계 및 조향형식별 차륜궤적 -작물손상의 시뮬레이션)

  • 정창주;김형조;조성인;최영수;최중섭
    • Journal of Biosystems Engineering
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    • v.21 no.1
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    • pp.34-43
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    • 1996
  • The present pesticide application technology widely used with a power sprayer in Korea is assessed as the problem awaiting solution in the point of view of its ineffectiveness, inefficiency, and environmental contamination. As one approach to get rid of these problems, the boom spraying with ultra-low volume and precision application technology has been recommended. The study was undertaken to investigate plants damages incurred by the self-propelled boom-sprayer vehicle, to develop the design criteria of vehicle wheel, and to compare plant damages caused by the front wheel steering vehicle, the 4-wheel drive vehicle and the articulated vehicle, by the computer simulation. The experiment showed that the amount of damaged plants incurred by the self-propelled boom sprayer were about 0.29% in average in the field size of 100m$\times$50m(0.5ha), about 60~80% of which recovering while growing. The recommandable wheel size was analyzed to be 70~100cm in diameter, 8~15cm in width from the vehicle-plant-soil relationship. The simulation on damaged plants anticipated to be incurred by various steering vehicles showed that the smaller the turning radius, the lesser the damaged plants within its range of 3~5m. Average plant damage rate by the front wheel steering vehicle, the 4-wheel drive vehicle and articulated vehicle was relatively assessed to be 2 : 1.8 : 1.

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Simulation-based Sensitivity Analysis of Suspension Elements of an Articulated Bogie (시뮬레이션에 의한 관절대차 현가요소 민감도 해석)

  • 한형석
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.7
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    • pp.201-207
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    • 2003
  • Sensitivity analysis of suspension elements of an articulated bogie for light railway vehicles is presented. The ride, stability and safety are used as dynamic performance indices. Suspension elements of 10 and a conicity of wheel are used as design variables. To analyze sensitivity of design variables. the railway vehicle dynamics analysis program AGEM is used. The results show that the secondary suspension elements have a strong effect on ride and the primary suspension elements have a moderate effect on ride. Conicity of wheel has a strong effect on the stability. The safety is not effected by all the design variables.