• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2003.07a
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• pp.122-127
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• 2003

국내에서 사용되는 트랙터는 출력과 상관없이 쟁기 작업을 포함한 농작업, 운반작업 등이 주로 사용되는 편이나, 북미 또는 서유럽의 경우 소형 트랙터는 토목공사의 로더, 굴삭 작업 또는 잔디깍기 등의 농장 및 정원 관리용 등으로 주로 사용되며 쟁기 작업은 거의 하지 않는다. 이와 같은 목적으로 사용하는 트랙터는 견인력을 적게 요구하는 대신 잦은 변속 및 전후진의 방향 전환을 요구하므로, 기계식 트랙터로써는 많은 불편함을 느낄 수밖에 없다. HST 트랙터는 다양한 작업성을 만족시키는 동시에 조작성이 편리하다는 장점이 있다. (중략)

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.7-7
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• 2017

본 연구는 수확 작업에 따른 농업용 트랙터의 차축 부하 분석을 목적으로 수행되었다. 트랙터의 부하 측정을 위한 부하 계측 시스템은 4개 차축의 토크 측정을 위한 휠 토크미터, 부하 데이터 수집을 위한 데이터 수집장치, 토크미터에 전원을 공급하기 위한 전원공급장치, 트랙터 배터리를 이용하여 노트북 및 전원공급장치에 전원을 공급하기 위한 인버터, 데이터 처리를 위한 노트북으로 구성하였다. 본 연구에서는 부하계측을 수행하기 위해 동양물산(주)의 60 마력급 트랙터 T623을 사용하였다. 부하 분석은 수확 작업에 따른 주행 단수 별 데이터를 이용하여 통계분석을 수행하였다. 수확 작업 시 L2단에서 좌측 전륜에서의 최대, 최소, 평균, 표준편차 토크는 각각 1735.44, 818.36, 1201.38, 175.53 Nm로 나타났으며, 우측 후륜에서는 3685.11, 1971.68, 2981.80, 258.36 Nm로 나타났다. L3단에서 좌측 전륜에서의 최대, 최소, 평균, 표준편차 토크는 각각 1580.94, 701.06, 1007.93, 125.11 Nm로 나타났으며, 우측 후륜에서는 3239.57, 1735.44, 2472.11, 307.85 Nm로 나타났다. 트랙터의 차축 부하는 L2단에서 L3단으로 작업속도가 증가함에 따라 좌측 전륜에서 약 0.83배, 우측 후륜에서 약 0.82배 감소하는 것으로 나타났다. 향후에는 Romax_Designer (Version 17, Romax Technology, UK)을 사용하여 작업 부하에 따른 트랙터 트랜스미션 해석을 하여 트랙터 PTO 최적설계 가능성을 제시할 계획이다. 정격 출력 조건에서 시뮬레이션을 진행하여 트랙터 트랜스미션을 설계하면 안전성을 확보할 수 있지만 최적설계를 위해서는 실제 포장시험 데이터를 이용한 시뮬레이션이 필요하다고 판단된다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.05a
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• pp.57-58
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• 2023

The working time for loading and transporting containers in the container terminal is one of the factors directly related to port productivity, and minimizing working time for these operations can maximize port productivity. Among working time for container operations, the working time of yard tractors(Y/T) responsible for the transportation of containers between berth and yard is a significant portion. However, it is difficult to estimate the working time of yard tractors quantitatively, although it is possible to estimate it based on the practical experience of terminal operators. Recently, a technology based on IoT(Internet of Things), one of the core technologies of the 4th industrial revolution, is being studied to monitoring and tracking logistics resources within the port in real-time and calculate working time, but it is challenging to commercialize this technology at the actual port site. Therefore, this study aims to develop yard tractor working time prediction model to enhance the operational efficiency of the container terminal. To develop the prediction model, we analyze actual port operation data to identify factors that affect the yard tractor's works and predict its working time accordingly.

• Journal of Digital Convergence
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• v.13 no.8
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• pp.281-288
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• 2015

The container terminals use convergence technology that exchange information for cargo work, using wireless communication between the TOS(Terminal Operations System) and the handling equipments(CC, TC, YT). But if the container cargoes pile up high in the container yard, delayed cargo work and cargo working list information error happen because of communication dead spots(the worker can not receive the information) which wireless communication is disconnected. At this time the driver of the yard tractor(YT) must be able to recognize the communication state. If then, delayed cargo work and cargo working list information errors that occur in the shaded communication area can be avoided, and can process the delayed work due to wireless communication break. In this project, we have built wireless communication environment to increase the efficiency of the loading and unloading operations which the operator can respond actively, when the work is delayed and work orders result in errors. That is, the flow of the wireless communication module has been changed.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1999.12a
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• pp.99-106
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• 1999

• Korean Journal of Soil Science and Fertilizer
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• v.36 no.6
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• pp.367-375
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• 2003

The aim of this study was to investigate the soil physical properties and the traction characteristics of paddy field before tillage by a computer simulation. Soil physical properties, such as soil moisture content, bulk density, soil hardness, and soil texture were measured in the twelve rice production area. Mathematical model based on dimensional analysis which include soil physical properties and vehicle factors was used for the computer simulation. Most of the soil texture of the investigated area was silty loam, loam and silty clay loam. Soil moisture content ranged between 20 and 40% mostly. Soil bulk density was in the range of 1,500 to $1,700kg\;m^{-3}$. Soil hardness ranged between 2 to $12kg\;cm^{-2}$ mostly. Soil hardness incorporates the effects of many soil physical properties such as moisture content, texture and bulk density, and so the range of soil hardness was greater than that of any other physical properties. The predicted net traction was in the range of 70 to 1,500 kgf depending on the area, but it was above 1,000 kgf for most of the investigated area. Thus it was concluded that 50 HP tractor can pull the four row moldboard plow considering the conventional tillage depth and width. But for the soft soil area such as Andong and Namyang, tractor itself may have mobility problem and show high slip during plowing operation.

• Journal of Navigation and Port Research
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• v.33 no.6
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• pp.401-407
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• 2009

The improvement in the terminal productivity plays a key role for container terminals to be more competitive. The productivity of yard tractors(YT) is one of the most important factor accelerating the terminal productivity. Thus, YT pooling system is newly introduced in container terminals for increasing the YT productivity. Recently, the terminals in Korea tend to adopt YT pooling system. This paper proposes the important decision factors for YT pooling work space and several types of formulations according to states of container terminals.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2003.07a
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• pp.117-121
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• 2003

다양한 형태의 작업을 수행하는 트랙터의 변속기에 대한 신뢰성을 확보하기 위해서는 장기간의 수명 시험이 요구된다. 이러한 수명 시험시간을 단축하기 위해서는 트랙터가 포장에서 이용되는 형태를 토대로 한 수명예측과 가속패턴을 작성하고 가속계수 결정하는 가속 시험법이 정립되어야 한다. (중략)

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.07a
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• pp.54-59
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• 2002

트랙터는 다목적으로 이용 가능한 작업기를 부착하여 농ㆍ축산가에서 널리 사용되고 있는 장비로써 1980년대부터 본격적으로 보급되기 시작하였으며, 보급대수는 1980년 2,644대, 1990년 41,203대, 1995년 100,142대, 1997년 131,358대로서 1990년 이후 급격히 증가되었다. 이처럼 부족한 농업 인력을 대신하기 위해 트랙터의 수요가 증가하고 있지만, 인간공학적 설계원칙의 결여로 비능률적, 비생산적이며, 안전에 대한 위험이 항상 뒤따르고 있는 실정이다. (중략)

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2009.10a
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• pp.220-221
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• 2009

One of the important performance measure for productivity at container terminals is the working productivity in the quay. working scheduling of quay cranes (QCs) gives a significant impact on the quay working productivity. The recent managers of the terminals pay high interests in equipment investment and operation methods with a new concept in order to enhance the quay working productivity. The double cycle or dual cycle, which is a method to increase the quay productivity with no application of new equipment, but with the change of operations, has been received strong attention in academic research. The majority of studies until this time has been realized the quay work as the bottleneck and focused on those works. However, if the QCs do notver, it the Cs d-trotver,(CT) if t the Cs, there would be the pos ibilf tes that the effectiveness of them is decreasedveaused by the longer, if t the Cs. Thus, this paper, suggests the solutions on the con th scheduling for the dual cycle operation considering the YT.