• Title/Summary/Keyword: Tractive Performance

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The Effect of Track Tension on the Tractive Performance of Combine (궤도(軌道)의 장력(張力)이 콤바인의 주행(走行) 성능(性能)에 미치는 영향(影響))

  • Park, G.B.;Kim, K.U.
    • Journal of Biosystems Engineering
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    • v.17 no.3
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    • pp.237-246
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    • 1992
  • This study was conducted to investigate experimentally the effect of track tension on the tractive performance of rice combine. The experiment was carried out at the two in-door soil bins with soil types of loam and sandy loam. The initial track tension was varied by three different values of 0.71, 1.75 and 3.84kN at three different forward velocity settings of 0.17, 0.32 and 0.45m/s, respectively. The data acquisition system was designed and used for the measurement of pull, driving axle torque and its velocity under the test conditions to calculate the tractive efficiency. Results of the study were summarized as follows : 1) The effect of the initial track tension on the tractive efficiency was found being significantly dependent on soil types but not on forward velocities. Therefore, the benifit of adjusting the initial track tension may be obtained when the types of soils on which combines operate are changed. 2) In loam, tractive efficiency decreased with increase in track tension. However, it increased in sandy loam until it reached to a peak value and then decreased with increase in track tension. 3) The maximum tractive efficiency of the tested combine was obtained with an initial track tension of about 1.75kN on sandy loam, and below that on loam at about 5% slippage without being noticeably influenced by the forward velocity.

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Tractive Performance Comparison Between Wheel-Drive Tractors and A Rubber Belt Crawler Tractor

  • Nikoli, I.R.
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 1993.10a
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    • pp.1196-1201
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    • 1993
  • Test of Caterpillar Challenger 65 tractor which has rubber tracks, and articulated four wheel drive tractor with dual wheels and a mechanical front wheel drive tractor were conducted on an unplowed and plouwed wheat stubble field. The following parameters were analyzed : tractive efficiency (ηv), net tractive coefficient ($\phi$n), slip ($\sigma$) , drawbar pull(Fv), drawbar power (Pv) and forward velocity(v). The maximum net tractive coefficient was established at the tractive efficiency of 0.60 on the unplowed wheat stubble field : for the Challenger 65 tractor 0.855 ; 4WD 0.624 and MFWD 0.534 and on the plowed wheat stubble field with the tractive efficiency of 0.40 for the Challenger 65 tractor 0.82 : 4WD 0.57 and for tractor MFWD 0.48.

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Computer simulation for the Prediction of Mobility and Tractive Performance of Tracked Vehicles (궤도형 로외차량의 주행 및 견인 성능 예측 컴퓨터 시뮬레이션)

  • 김경욱;신범수;김채주
    • Transactions of the Korean Society of Automotive Engineers
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    • v.2 no.3
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    • pp.105-112
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    • 1994
  • A computer program was developed for the simulation of mobility and tractive performance of tracked off-road vehicles. Input parameters for the simulation involve those characterizing track and power drive line of a vehicle and soil conditions upon which the vehicle operates. The simulation predicts tractive performance in terms of soil thrust and motion resistance of track device and mobility performance in terms of the maximum speed, time-distance and time-speed relation that a vehicle can obtain under the given soil conditions. It also determines whether or not the vehicle can move in those conditions. An example of performing simulation was presented and its results showed that the performance prediction was reasonably in a good agreement with the published data.

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Effects of Design Parameters of Lug on Tractive Efficiency and Rolling Resistance of Pneumatic Tires (러그의 설계인자(設計因子)가 공기(空氣)타이어의 견인효율(牽引効率) 및 구름저항(抵抗)에 미치는 영향(影響))

  • Chung, Woo Won;Kim, Kyeong Uk
    • Journal of Biosystems Engineering
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    • v.10 no.2
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    • pp.12-18
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    • 1985
  • In order to investigate the effects of design parameters of lug on the tractive performance of pneumatic tires, soil bin tests were conducted for the test tires having different values of design parameters. The experimental results were presented in terms of lug space, lug angle and lug shape versus the tractive efficiency and rolling resistance of the test tires.

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Design of Motor-driven Traveling System for High Clearance Working Machinery based on Tractive Performance and Hill Climbing Ability (견인 및 등판 성능을 통한 고소작업기계의 모터 주행장치 설계)

  • Lee, Sangsik;Jang, Seyoon;Kim, Taesoo;Nam, Kyoucheol;Park, Wonyeop
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.9 no.3
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    • pp.257-265
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    • 2016
  • In this study, an optimal design for motor-driven track type traveling system applied into high clearance working machineries in orchard is proposed. Tractive performance and hill climbing ability were predicted and evaluated for the optimal motor traveling system by taking into account of soil characteristics in orchard utilizing the high clearance working machineries. Design criteria for tractive performance were based on the traction force calculated from tractive effort subtracted by motion resistance, while hill climbing ability had its design criteria that fulfill the climbing 20% slope ground at a speed of 3km/h. Based on the evaluation results of traction and climbing ability, two DC48V, 4500rpm, 1.6kW AC motors were independently applied to both left and right side of orbits; each motor is designed to transmit power on driving sprocket of track type traveling system via 50:1 reduction gear ratio. The motor-driven track type traveling system developed in the study found to have 396 kgf of tractive force, which is 12.5% higher than climbing resistance at orchard soil having 20% slope ground (352 kgf), demonstrating sufficient tractive performance and hill climbing ability.

Prediction of Tractive Performance of Off-Road Wheeled Vehicles (로외에서 운용되는 휠형차량의 견인성능 예측)

  • 박원엽;이규승
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.5
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    • pp.188-195
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    • 2000
  • This study was conducted to develop the mathematical model and the computer simulation program(TPPMWV) for predicting the tractive performance of off-road wheeled vehicles operated on various soil conditions. The model takes into account main design parameters of a wheeled vehicle, including the radius and width of front and rear tires, the weight of vehicle, wheelbase and driving type(4WD, 2WD). Soil characteristics, such as the peressure-sinkage and shearing characteristics and the response to repetitive loading, are also taken into consideration. The effectiveness of the developed model was verified by comparing the predicted drawbar pulls using TPPMWV with measured ones obtained by field tests for two different driving types of wheeled vehicle. As a results, the drawbar pulls predicted by the TPPMWV were well matched to the measured ones within the absolute errors of 5.25%(4WD) AND 9.42%(2WD)for two different driving types, respectively.

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Prdiction of Tractive Performance of Wheeled Vehicles on Soft Terrains (휠형차량의 연약지 견인성능 예측)

  • 박원엽;이규승
    • Journal of Biosystems Engineering
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    • v.25 no.5
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    • pp.359-368
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    • 2000
  • In this paper, mathematical model was developed for predicting the tractive performance of off-road wheeled vehicles operated on soft terrains. Based on the mathematical model, a computer simulation program(TPPMWV) was developed. The model takes into account main design parameters of wheeled vehicle, including radius and width of front and rear tire, weight of vehicle, wheelbase and driving type(4WD, 2WD). Soil characteristics, such as the peressure-sinkage and shearing characteristics and the response to repetitive loading and slip-sinkage effect, are also taken into consideration. The effectiveness of the developed model was verified by comparing the predicted drawbar pulls using TPPMWV with measured ones obtained by field tests for two different driving types of wheeled vehicle. As a results, the drawbar pulls predicted by the TPPMWV were well matched to the measured ones within the absolute errors of 3.916%(4WD) and 13.31%(2WD) for two different driving types, respectively.

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PRELIMINARY STUDY ON AN AUTOMATIC PROPELLANT SYSTEM FOR IMPROVING TRACTIVE PERFORMANCE OF TRACTOR

  • Hong, Tiansheng;Shao, Yaojian
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 1993.10a
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    • pp.801-809
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    • 1993
  • This paper presents the design of an automatic propellant system model in order to improving tractive performance of tractor. The theoretical basis of automatic control , the characteristics and function of the system, and the kinematic analysis are also discussed.

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Evaluation of Tractive Performance of an Underwater Tracked Vehicle Based on Soil-track Interaction Theory (궤도-지반 상호작용 이론을 활용한 해저궤도차량의 구동성능 평가)

  • Baek, Sung-Ha;Shin, Gyu-Beom;Kwon, Osoon;Chung, Choong-Ki
    • Journal of the Korean Geotechnical Society
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    • v.34 no.2
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    • pp.43-54
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    • 2018
  • Underwater tracked vehicle is employed to perform underwater heavy works on saturated seafloor. When an underwater tracked vehicle travels on the seafloor, shearing action and ground settlement take place on the soil-track interface, which develops the soil thrust and soil resistance, respectively, and they restrict the tractive performance of an underwater tracked vehicle. Thus, unlike the paved road, underwater tracked vehicle performance does not solely rely on its engine thrust, but also on the soil-track interaction. This paper aimed at evaluating the tractive performance of an underwater tracked vehicle with respect to ground conditions (soil type, and relative density or consistency) and vehicle conditions (weight of vehicle, and geometry of track system), based on the soil-track interaction theory. The results showed that sandy ground and silty sandy ground generally provide sufficient tractions for an underwater tracked vehicle whereas tractive performance is very much restricted on clayey ground, especially for a heavy-weighted underwater tracked vehicle. Thus, it is concluded that an underwater tracked vehicle needs additional equipment to enhance the tractive performance on the clayey ground.

Off-road tractive performance of tracked vehicles and the effects of soil parameters (궤도차량의 야지기동성 평가와 토지특성의 영향)

  • 김진우
    • Journal of the korean Society of Automotive Engineers
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    • v.13 no.4
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    • pp.76-84
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    • 1991
  • The off-road tractive performance of tracked vehicles can be evaluated in terms of soil thrust, motion resistance and drawbar pull. The ability to predict accurately ground pressure distribution under track is of importance since the vehicle sinkage and motion resistance are closely related to it. While the formulation of the method for predicting ground pressure distribution follows closely in spirit the ideas outlined for the terrain with linear pressure- sinkage relation case by Garber and Wong, the analysis of various terrain stiffness is magnified by numerical implementation procedure. The effects of soil parameters on tractive forces can be introduced through the terrain-track interaction such as pressure-sinkage and shearing characteristics. It is illustrated by determining the drawber pull-slip relation and corresponding ground pressure distribution for the terrains typically chosen and by comparing the results with the conventional ones based on normal ground pressure. The factorial experiment method is finally adopted for checking the sensitivity of the values of soil parameters on the drawbar pull.

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