• Title, Summary, Keyword: Power driveline

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Computer Aided-Optimum Design of Tractor-Rotary Power Driveline (II) - Optimum Design - (컴퓨터를 이용한 트랙터 -로터리 전동 라인의 최적 설계 (II) -최적 설계 -)

  • 류일훈;김경욱;김대철
    • Journal of Biosystems Engineering
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    • v.22 no.2
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    • pp.105-116
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    • 1997
  • Using the design variables and conditions reported in the rut part of this paper, an analysis and optimum design of the tractor-rotary power driveline were carried out. The optimum design method involved 1 variable, 2 variable and multiple variable analysis performed as requested in the design process. In order to evaluate the effects of the design variables on the power transmission performance a sensitivity analysis were also conducted. the results indicated that the length and link point of the upper link, the upper hitch point of the implement master and the location of the implement input connection affect most significantly the driveline performance. The optimum design improved the performance of an exampled tractor-rotary driveline by 93% in terms of cosine ratio.

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Computer Aided-Optimum Design of Tractor-Rotary Power Driveline (I) - Analysis of Design Conditions and Variables - (컴퓨터를 이용한 트랙터 -로터리 전동 라인의 최적 설계 (I) - 설계 조건과 설계 변수 분석 -)

  • 류일훈;김경욱;김대철
    • Journal of Biosystems Engineering
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    • v.22 no.1
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    • pp.1-10
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    • 1997
  • A ratio of cosine values of two intersection angles in a tractor-rotary power driveline was established as a design criterion which must be satisfied in the range of vertical movement of the rotary with respect to the tractor. In addition tractor-rotary power driveline was analyzed and 25 design variables were Proposed. The intersection angles were also derived using the design variables. Using the design condition and variables, a computer program was developed to evaluate the performance of the driveline and to simulate the vertical movement of rotary. Several methods for searching the optimum design were also suggested.

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Analysis of Gear Rattle Using a Dynamic Load Model of Agricultural Tractor Driveline (동하중 모형을 이용한 트랙터 전동라인의 치타음 분석)

  • 류일훈;김경욱
    • Journal of Biosystems Engineering
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    • v.27 no.5
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    • pp.371-380
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    • 2002
  • The objectives of this study were to analyze gear rattle in a power drive line using its dynamic model and to derive design guidelines to eliminate it. A 72 degrees of freedom model of power driveline of an agricultural tractor was developed and proved to be valid fer predicting the collision characteristics of gears in mesh, which may determine whether or not the gear rattle will occur. Using the model the effects on the rattle of drag torque, backlash, mass moment of inertia, transmitting torque were analyzed. Increasing drag torque or decreasing mass moment of inertia reduced gear rattle. The gears transmitting power do not develop rattles. It was also found that a large amount of rattle is likely to be developed by the change gears placed at the end of idle shafts. Increasing the drag torque to such change gears may be the most effective way of reducing the gear rattle in a tractor driveline.

Characteristics of Power Efficiency of Tractor Driveline (트랙터 전동라인의 전동효율 특성 분석)

  • 류일훈;김대철;김경욱
    • Journal of Biosystems Engineering
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    • v.27 no.1
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    • pp.19-24
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    • 2002
  • According to the field test, the transient power transmission efficiency of a tractor driveline fluctuated in a range of 56 to 86% and the mean value was about 72.5%. Therefore, the constant efficiency model commonly used for a simulation of power performance was not proper far predicting such a variable of efficiency. In order to predict power efficiency more accurately, new concepts of the maximum efficiency and drag torque were introduced and a new model based on the these concepts was proposed. The difference between measured and model-predicted efficiencies was about 1.5% in average with a standard deviation of 1.1%. The new power efficiency model was expected to enhance the accuracy of predicting power transmission efficiencies of tractor drivelines.

Analysis of the PTO Driveline Rattle Noise on an Agricultural Tractor (농업용 트랙터 PTO 전동라인의 래틀 소음 분석)

  • Ahn, Da-Vin;Shin, In-Kyung;Han, Hyun-Woo;Son, Gwan-Hee;Park, Young-Jun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.6
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    • pp.45-54
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    • 2019
  • In this study, we analyze the rattle noise of a power takeoff (PTO) driveline and develop a PTO driveline resonance model. We measured the rattle noise of the PTO driveline on the output shaft and, by analyzing the rattle noise in the time domain, we determine that the engine expansion stroke period matches the sound pressure of rattle noise. This finding helped us demonstrate that the rattle noise is caused by the collision between the PTO driving gear and the gear driven by the engine expansion stroke; the torsional vibration caused by this collision is affected by the angular velocity fluctuation of the PTO drive shaft. By measuring the angular velocity of the PTO drive shaft, we confirm that the angular velocity fluctuation of the engine flywheel tends to excessively amplify the PTO drive shaft angular velocity fluctuation. We conclude that the resonance, which occurs when the operating frequency of the engine is close to the natural frequency of the tractor power transmission system, causes the excessive angular velocity fluctuation of the PTO drive shaft. We performed a modal analysis of the PTO driveline resonance and, using the characteristic equation, we show that the resonance occurs when the engine rotation speed is close to 850 rpm, which matches the natural frequency of the PTO driveline.

An Investigation on the Effects of Clutch Disk Characteristics for a Passenger Car Driveline (승용차 동력전달계에 대한 클러치 디스크 특성의 영향 고찰)

  • Kim, Young-Heub;Park, Dong-Hoon
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.19 no.3
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    • pp.243-250
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    • 2009
  • The clutch with torsional damper is installed on a passenger car with manual transmission, which not only transmits the power generated by engine to the transmission but also absorbs the shock and vibration from the engine. The torsional damper in the clutch dissipates the torsional vibration energy and eliminates the resonance in the driveline but high damping in the damper causes the increase of the vibration level which is against the comfort and durability. In this study, a dynamic model for the passenger car driveline with manual transmission was developed to investigate the vibration and the effects of characteristics of the driveline. With the dynamic model, the vibration characteristics of driveline were examined by the mode analysis and driving simulation, and the effects of hysteresis torque and spring constant were investigated. The vehicle tests with prototype torsional dampers were preformed and the test results showed good agreements with the simulation.

An Investigation on the Effects of Clutch Disk Characteristics for a Passenger Car Driveline (승용차 동력전달계에 대한 클러치 디스크 특성의 영향 고찰)

  • Kim, Young-Heub;Park, Dong-Hoon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.105-111
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    • 2008
  • The clutch with torsional damper is installed on a passenger car with manual transmission, which not only transmits the power generated by engine to the transmission but also absorbs the shock and vibration from the engine. The torsional damper in the clutch dissipates the torsional vibration energy and eliminates the resonance in the driveline but high damping in the damper causes the increase of the vibration level which is against the comfort and durability. In this study, a dynamic model for the passenger car driveline with manual transmission was developed to investigate the vibration and the effects of characteristics of the driveline. With the dynamic model, the vibration characteristics of driveline were examined by the mode analysis and driving simulation, and the effects of hysteresis torque and spring constant were investigated. The vehicle tests with prototype torsional dampers were preformed and the test results showed good agreements with the simulation.

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System Identification of In-situ Vehicle Output Torque Measurement System (차량 출력 토크 측정 시스템의 시스템 식별)

  • Kim, Gi-Woo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.2
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    • pp.85-89
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    • 2012
  • This paper presents a study on the system identification of the in-situ output shaft torque measurement system using a non-contacting magneto-elastic torque transducer installed in a vehicle drivline. The frequency response (transfer) function (FRF) analysis is conducted to interpret the dynamic interaction between the output shaft torque and road side excitation due to the road roughness. In order to identify the frequency response function of vehicle driveline system, two power spectral density (PSD) functions of two random signals: the road roughness profile synthesized from the road roughness index equation and the stationary noise torque extracted from the original torque signal, are first estimated. System identification results show that the output torque signal can be affected by the dynamic characteristics of vehicle driveline systems, as well as the road roughness.

Development of Algorithm for Advanced Driver Assist based on In-Wheel Hybrid Driveline (인휠 전기 구동 기반의 능동안전지원 알고리즘 개발)

  • Hwang, Yun-Hyoung;Yang, In-Beom
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.12
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    • pp.1-8
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    • 2017
  • This paper presents the development of an adaptive cruise control (ACC) system, which is one of the typical advanced driver assist systems, for 4-wheel drive hybrid in-wheel electric vehicles. The front wheels of the vehicle are driven by a combustion engine, while its rear wheels are driven by in-wheel motors. This paper proposes an adaptive cruise control system which takes advantage of the unique driveline configuration presented herein, while the proposed power distribution algorithm guarantees its tracking performance and fuel efficiency at the same time. With the proposed algorithm, the vehicle is driven only by the engine in normal situations, while the in-wheel motors are used to distribute the power to the rear wheels if the tracking performance decreases. This paper also presents the modeling of the in-wheel motors, hybrid in-wheel driveline, and integrated ACC control system based on a commercial high-precision vehicle dynamics model. The simulation results obtained with the model are presented to confirm the performance of the proposed algorithm.

Vibration Analysis of Gearbox for Agricultural UTV using a Reduced-Order Model (축소 모델 기법을 이용한 농업용 전동식 동력운반차 감속기의 진동 분석)

  • Kim, Beom-Soo;Cho, Seung-Je;Shin, In-Kyung;Chung, Woo-Jin;Han, Hyun-Woo;Kim, Ji-Tae;Park, Young-Jun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.8
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    • pp.8-17
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    • 2019
  • In this study, a model reduction technique was used to develop a precise noise and vibration prediction model for the individual components of a driveline system. The dynamic reduced-order model generated by the Craig-Bampton method was applied to perform dynamic analysis of an electric agricultural power cart. The natural frequency and acceleration response results were analyzed according to the different number of dominant sub-structural modes contained in the reduced-order models. Through the analysis results, it was confirmed that a sufficient number of dominant sub-structures to satisfy the operating conditions should be selected to construct an optimal reduced-order model.