• 제목/요약/키워드: Vehicle Pull

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타이어와 차량 쏠림 II-이론적 배경, Simulation, 실차검증 (Tire and Vehicle Pull II- Basic Theory, Simulation, and Verification)

  • 이정환;문승환
    • 한국자동차공학회논문집
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    • 제8권5호
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    • pp.157-164
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    • 2000
  • It is known that residual aligning torque of tires causes vehicle pull. There is, however, only a little literature available which shows how the residual aligning torque of tires causes vehicle pull. In this paper, a vehicle model in two degrees of freedom was adopted for the analysis of a vehicle under the straight-ahead motion. The analysis with this vehicle model clearly shows the effect of residual aligning torque of tires on vehicle pull. In order to show the validity of the analysis, a vehicle commercially available was selected. This vehicle was modeled in 137 degrees of freedom system with multibody dynamics software. Vehicle pull simulation results show that vehicle model drifts in lateral direction due to the residual aligning torque of tires. Vehicle test results with the car were also included.

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타이어와 차량 쏠림 I-시험결과 (Tire and Vehicle Pull I-Experimental Results)

  • 이정환;이주완
    • 한국자동차공학회논문집
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    • 제8권4호
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    • pp.194-201
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    • 2000
  • It is called vehicle pull when a vehicle drifts in the lateral direction under the straight-ahead motion with no steering or external input. Recently vehicle pull draws attention as one of the critical evaluation items from the customers on the vehicle quality. It is generally recognized that the vehicle pull is complex phenomena due to internal and external factors. In this paper the relations between vehicle pull and ire were investigated through close survey on the road test results from the final inspection of car manufactures. Through this investigation the factors are identified which play an important role in causing vehicle pull problem.

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토질특성에 따른 이동차량의 거동 (Behavior of Traveling Vehicle According to Soil Properties)

  • 박영호;김운영
    • 한국지반공학회지:지반
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    • 제13권2호
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    • pp.125-136
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    • 1997
  • 화강풍화토지반(SP)의 밀도와 함수비 그리고, 점성토지반(ML)의 함수비 변화가 불도저 궤도 차량의 주행성능에 미치는 영향을 알아보기 위하여, 강원도 춘천군 역골지역에서 실물크기의견 인력시험을 실시하였다. 시험결과로부터, 최적견인력거동은 함수비 뿐만아니라 밀도에도 크게 영향을 받음을 알았다. 또한, 본 연구에서는 지반상태에 따라서 변하는 견인력거동의 최적점 결정방법을 제안하였으며, 화강풍화토지반의 밀도에 따른 최적견인력과 최적슬립을 구하였다.

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FEM을 이용한 타이어의 벨트각도에 따른 PRAT 및 코너링 특성 연구 (A Study on Characteristics of PRAT and Cornering due to the Belt Angle of Tire by the FEM)

  • 성기득;김성래;김기현;김선주;조춘택
    • 한국정밀공학회지
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    • 제23권2호
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    • pp.104-112
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    • 2006
  • The influence of tire belt angle on the Plysteer Residual Aligning Torque(PRAT) and the cornering stiffness by the FEM has been studied. The PRAT is a performance factor of the tire about vehicle pull, and the cornering stiffness has relation to vehicle steering response of outdoor test. To validate FE model for analysis, simulation data for both the static stiffness(vertical, lateral) and the PRAT have been compared with the experimental data. In addition to the characteristics of the PRAT and the cornering stiffness due to the tire belt angle, rolling and cornering contact characteristics have been studied. The tendency of the PRAT and the cornering stiffness due to the belt angle can be used as a guide line for the tire design in relation to vehicle pull and vehicle steering response.

차량 쏠림 개선을 위한 전륜 현가시스템의 기하공차 최적화 (Optimization of Geometric Dimension & Tolerance Parameters of Front Suspension System for Vehicle Pulls Improvement)

  • 김용석;장동영
    • 대한기계학회논문집A
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    • 제33권9호
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    • pp.903-912
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    • 2009
  • This study is focused on simulation-based dimensional tolerance optimization process (DTOP) to minimize vehicle pulls by reduction of dimensional variation in front suspension system. In previous studies, the effect of tires and wheel alignment sensitivity have mainly been investigated to eliminate vehicle pulls in nominal design condition without allocating optimal tolerance level for selected components, among various factors regarding vehicle pulls such as vehicle design parameters, vehicle weight balance, tires, and environmental factors. Unfortunately, there are wide variations in the real vehicle, and these have impacted actual vehicle pulls, especially wheel alignment effects from suspension geometry variation has not been considered in the previous studies. In the tolerance design of suspension, tolerance variables with the uncertainty such as parts dimensional variation, assembly process, datum position and direction, and assembly tool tolerance has a great influence on the variation of the suspension dimensional performances. This study introduces total vehicle pull prediction model in considering major key factors for vehicle pull sensitivity. The Monte Carlo-based tolerance analysis model using Taguchi robust method is developed to optimize dimensional tolerance parameters, satisfying on the target variation level.

해저 연약지반 주행성능 실험기법 연구 (II) : 직진주행성능시험 (Experimental Technique for Trafficability on Soft Benthic Terrain (II) : Straight-line Motion Test of Tracked Vehicle)

  • 최종수;홍섭;김형우;이태희
    • 한국해양공학회:학술대회논문집
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    • 한국해양공학회 2003년도 춘계학술대회 논문집
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    • pp.116-120
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    • 2003
  • To study the trafficability on soft and cohesive benthic terrain, a tracked vehicle model($670mm(L){\times}750mm(B_c)$) is designed and tested. The pitch and chevron angle of grouser, weight and center of gravity of vehicle, and drawbar pull force are chosen as experimental variables. Slip, sinkage and inclined angle of vehicle are picked as performance values. Strength of soil is considered as noise factor. A preliminary straight-line motion test is performed. Then, DOE(Design of Experiment) is discussed for further research.

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Push-Pull-Mooring 모델을 이용한 전기자동차로의 사용자 전환의도에 관한 연구 (A Study on User Conversion Intention to Electric Vehicle Using Push-Pull-Mooring Model)

  • 우징원;김석태
    • 무역학회지
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    • 제47권6호
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    • pp.71-96
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    • 2022
  • This research will study the conversion intention of the users in China from fuel vehicle to new energy vehicles through the empirical methods. To this end, a questionnaire survey was conducted with car users as the object, combined with the theory of user migration and the PPM model to analyze the impact of fuel vehicle users' conversion intention to new-energy vehicles factor. The results showed that purchase experience contains the moderating effect, in which perceived risk and switching costs had a greater impact on the groups without purchase experience, whereas social identity, perceived value, personal attitude, and willingness to switch had a greater impact on groups with the purchase experience. Among all five factors, perceived risk had no discernible impact on the switching intention, but social identity, perceived value, attitude toward switching, and switching costs all had discernible impact on the switching intention. This study expects to come out with sustainable advises for the future growth of new energy vehicles from the study of car users' switching intention and the collective difference test of purchasing experience.

경인력시험을 통한 차륜차량의 구동효율에 관한 연구 (A study on the Analysis of Drive Efficiency by Drawbar Pull Test in the Wheeled Vehicle)

  • 양성모;강윤수
    • 오토저널
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    • 제9권2호
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    • pp.34-46
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    • 1987
  • The drive efficiency is investigated with drawbar pull test to provide the basic data in the gradability and acceleration of the wheeled vehicle. As a result, the drive efficiencies are determined from 4*2 drive : Direct gear 0.89 1st gear 0.81 Other gears 0.83-0.87 4*4 high drive : Direct gear 0.85 1st gear 0.77 Other gears 0.79-0.83 4*4 low drive : Direct gear 0.83 1st gear 0.75 Other gears 0.77-0.81

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심해저 연약지반용 무한궤도차량의 견인력-슬립 관계에 관한 실험적 연구 (An Experimental Study on Relationship of Tractive Force to Slip for Tracked Vehicle on Deep-sea Soft Sediment)

  • 여태경;박성재;최종수;홍섭;김형우;원문철
    • 한국해양공학회지
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    • 제21권1호
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    • pp.75-80
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    • 2007
  • Measuring the ground speed and the rotation speeds of tracks is an easy and realistic method to detect the track slips. It is very advantageous if the slips can be measured and applied to real time control of the vehicle. With a proper speed, the tractive force of a tracked vehicle may be calculated from the vehicle dynamics. For the control of tracked vehicle, the relationship between the slip and the tractive force is necessary. In this paper, a series of drawbar-pull tests, in which slips of two tracks are measured under the variational draw-bar weight, is executed to directly obtain the slip-tractive force relationship. For the purpose of the test, a tractive vehicle model was manufactured, and an artificial soil was simulated by using a bentonite-water mixture.

정상 상태 롤링 해석 기법 적용을 통한 타이어 패턴 형상에 따른 PRAT 특성 연구 (The Study on PRAT Performance due to Tire Pattern Shapes using Steady State Rolling Analysis Method)

  • 성기득;박현만;구병국;조춘택
    • 한국자동차공학회논문집
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    • 제16권5호
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    • pp.15-21
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    • 2008
  • It is generally known that the PRAT(Plysteer Residual Aligning Torque) is one of indicating a performance factors of a tire for assessing the vehicle pull, also tire pattern shape, which means lateral groove angle, is very important tire design factor in relation to the PRAT. Lateral grooves of tire pattern are widely divided into center and shoulder parts. So, this paper has studied the correlation between the PRAT and their lateral groove angles using FEM. Especially, the steady state rolling analysis among tire rolling analysis methods has been used for the PRAT performance study. Firstly, analysis result data have been compared with the experimental data to validate FE analysis for PRAT. Next, the PRAT due to the lateral groove angle about PCR(Passenger Car Radial) tire and SUV tire has been analyzed. The tendency of the PRAT due to the lateral groove angles can be used as a guide line for the tire design in relation to vehicle pull.