• Journal of Biosystems Engineering
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• 제40권3호
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• pp.284-288
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• 2015

Training power tiller operators in safe farming is necessary to avoid farming accidents. With the continuing progress in computational technology, driving simulators have become increasingly popular for conducting such training. Purpose: The objective of this study is to develop mock control devices and data acquisition apparatus for a tiller simulator. Methods: Except for the stand and tail wheel adjusting levers, the mock control devices were developed using a tiller handle assay. The data acquisition apparatus was realized using an embedded data-logging device and LabVIEW, the system design software. Results: The control devices of a real handle assay were successfully mimicked by the mock operator control devices, which used sensors for the relevant measurements. The data from the mock devices were acquired and transmitted to the main computer at intervals of 10 ms via Wi-Fi. Conclusions: The developed mock control devices operate similar to real power tillers and can be utilized in power tiller training simulators.

• Journal of Biosystems Engineering
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• 제12권3호
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• pp.17-29
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• 1987

A 10-degree of freedom mathematical model of motion for power tiller-trailer system was developed. This model can predict motion characteristics of power tiller trailer system while travelling over smooth and irregular ground surfaces under various operating conditions. The model provide, the fundamental data needed to improve the stability of power tiller-trailer systems.

• Journal of Biosystems Engineering
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• 제12권2호
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• pp.1-15
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• 1987

A mathematical model is developed and computer programmed for simulation of power tiller motion. The model consists of a main body and two driving wheels resulting in an 8 degrees of freedom system. Drawbar loading is also included by coupling the model with a sub-model representing the implement to be used. The computer program SIMPTL can predict motion characteristics and static stability of power tiller under a given set of ground and operation conditions.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
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• pp.291-296
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• 1993

Taking a bledes axle of rotary tiller as a example, this paper discusses influences of four loading essential factors, which are strengthened amplitude, cycle times, loading sequence and loading frequency. in fatigue life. Determination principles of above four factors and monitoring methods of fatigue damage by local strain are dealt with. The actual field testing check of farm machinery is rapidly simulated by laboratory program fatigue test can shorten the period of development and improvement of a product. In the time of in-door simulation test, damage monitoring and four loading essential factors, which are strengthened amplitude , cycle times, loading sequence and loading frequency, have to be dealt with . If these problems are solved successfully, it is possible to accelerated test speed, reduce costs and manhours, and raise accuracy of test result. However strengthening method, loading pattern and influence of loading frequency on test result have not so far been discu sed systematically, damage monitoring is even more a difficult problem. Authors have studied above problems with the object of blades axle of rotary tiller.

• 한국산업융합학회 논문집
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• 제23권4_2호
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• pp.661-667
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• 2020

The optimal shape modeling of core parts through 3D modeling and structural analysis for the development of small and medium-sized ships. The goal is to improve the efficient structure of the hydraulic system for controlling the rudder among the core steering parts in small and medium-sized ships. Through 3D modeling and structural analysis, a new concept of tiller parts and a double-acting hydraulic cylinder control system were proposed and operational structural stability was evaluated. Structural analysis of the three different tiller designs that can be replaceable onto existing fishing vessels was conducted to derive the final shapes. The emphasis was placed on evaluating the structural stability of the key drive components, the tiller, pin, and cylinder rodin the maximum torque condition of the hydraulic cylinder.

• 한국농림기상학회지
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• 제3권1호
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• pp.22-29
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• 2001

벼 다수성 품종인 다산벼는 포장조건에서 단위면적 당 수수가 자포니카 품종보다 적어서 수량에 제한요인이 되고 있어 다수성 벼의 분얼특명을 구명 하고자 1999년 작물시험장 인공기상연구동에서 indica$\times$japonica 교잡종인 다산벼와 자포니카 품종인 화성벼를 공시하여 다수성 벼의 수량 향상을 위한 품종 육성 및 재배 기술의 기초 자료를 제공 하고자 시험한 결과는 다음과 같다. 1. 분얼과 출엽 관계는 다산벼가 y=0.8638x＋3.4901 ($R^2$=0.9529$^{**}$ ), 화성벼는 y=0.8844x＋3.2832($R^2$=0.9084$^{**}$ )으로 비슷하여, 분얼경 1개가 발생 할 때 엽 발생은 다산벼가 0.86엽, 화성벼가 0.88엽이 발생하여 뚜렷한 차이를 나타내지 않았다. 2. 온도별 분얼발생 및 종료시기는 두 품종 모두 26$^{\circ}C$까지 온도가 높을수록 일렀고, 분얼경 증가 속도는 26, 24$^{\circ}C$에서는 다산벼가 빠르고 22$^{\circ}C$~17$^{\circ}C$에서는 화성벼가 빨랐다. 3. 온도에 따른 1차 분얼경 최초 발생 시기는 다산벼는 7~9일, 화성벼는 8~10일이었으며, 2차 분얼경은 다산벼가 26$^{\circ}C$, 24$^{\circ}C$에서는 이앙 후 16, 17일, 22$^{\circ}C$에서 23일, 19$^{\circ}C$에서 27일, 17$^{\circ}C$에서 38일이었으며, 화성벼는 26~19$^{\circ}C$ 처리에서 이앙 후 19~22일, 17$^{\circ}C$에서는 26일이었다. 4. 유교분얼경 최종 출현일은 다산벼가 17~26$^{\circ}C$에서 1차 분얼경은 이앙 후 27~33일, 2차 분얼경은 20~41일이었으며, 화성벼는 1차 분얼경은 23~40일, 2차 분얼경은 24~40일이었다.

• 한국작물학회지
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• 제51권spc1호
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• pp.52-57
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• 2006

벼 담수직파재배에서 입모수가 적정입모수(120개/$m^2$)보다 적은 과소구를 60개/$m^2$, 적정입모수보다 많은 과다구를 200개/$m^2$로 설정하여, 과소구의 경우 3엽기에 4 kg/10a의 질소를 추가 시비하여 분얼발생을 촉진시키고 과다구에서는 5엽기에 시용하는 분얼비 3.3 kg/10a의 질소시비를 생략하여 분얼을 억제한 결과는 아래와 같다. 1. 개체별 최고분얼수는 적정구가 9.8개인데 비하여 과소구는 15.2개, 과다구는 8.6개이었으며, 개체별 유효분얼수는 적정구가 3.7개, 과소구가 6.5개, 그리고 과다구가 2.4개로 입모가 과다할수록 개체당 분얼수가 줄어들고 유효경비율이 낮아졌다. 2. 분얼발생 양상은 입모밀도에 관계없이 주간 3절위에서 첫 번째 1차 분얼이 발생하였으며, 유효분얼은 과소구, 적정구, 과다구에서 각각 6.5개/plant, 3.7개/plant, 2.4개/plant 발생하였다. 3. 입모과소구의 벼 개체내에서 분얼의 발생 순서와 간장, 수장, 무효분얼수, 수당립수, 임실율은 부의상관관계가 있었으나, 적정 입모밀도에서는 유의한 상관이 없었다. 입모과다구에서는 분얼발생순서와 수장, 무효분얼, 완전미율이 유의한 상관관계를 나타내었다. 4. 현미외관 특성은 입모 과소구가 적정구나 과다구 보다 청미발생이 적어서 완전미율이 가장 높게 나타났으며, 과다구와 적정구의 경우에는 1차 분얼에서 청미발생이 과소구보다 15-20%정도 높게 나타났다. 5. 쌀 수량은 적정구가 494 kg/10a인데 비하여 과소구는 적정구의 99%, 과다구는 적정구의 97%의 수량이 확보되었다.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
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• pp.227-238
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• 1993

IRRI Engineering Division has developed a well drilling rig attachment that matched power tiller or hand tractor. It was designed in response to the growing demand for ground water utilization for small-scale irrigation, especially in drought-sticken and rained farms in Asian countries. The power tiller-driven rig can drill 30 meters of 100mm well in an unconsolidated formation in one day and can be rapidly converted from rotary to jetting or to the percussion method of drilling to suit different soil and rock formation. In addition, the power tiller can be quickly installed or removed from the rig frame and can be used for transporting the rig to other sites. The rig can be dismantled into smaller sub-assemblies for carrying by hand into less accessible areas. One manufacturer in Central luzon Philippines has started to produce the rig for well drillers in Central Luzon. The Department of Agriculture in the Philippines have procured thirty three(33) units of these machines f r their Shallow Tubewell program.

• Journal of Biosystems Engineering
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• 제28권2호
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• pp.97-106
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• 2003

One of the obstructing factors against managing dairy fm has been heavy labor requirement for feeding dairy cows. A Power-tiller TMF mixer was developed to reduce the cost and to provide economic benefit. The TMF mixer was desisted by the feeding capacity of 20∼30 heads at a batch with various functioning systems of auger type mixer, delivery conveyer, weighing console, pipe heater type heating system, power transmission train and mounting trailer. According to the study resulted, it showed that 1,200rpm, 1,600rpm, 2,000rpm and 2,300rpm were 6ps. Bps, lops and 12ps respectively. and that reduced shaft output by 15%. On the fodder mixer attached powertiller, initial output was necessary large torque. And the heating system was maintaining uniform temperature 60$^{\circ}C$ relatively.

• 한국연초학회지
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• 제15권1호
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• pp.57-62
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• 1993

Ridger and vinyl mulcher for 8-10 PS power tiller which were distributed at the rate of one out of 2.3 farm households in Korea, was developed to ease the labor shortage of tobacco production. Devices wheel shaft extension by 30cm at both sides improved the stability of straight drive and enabled to save required labor hours by 50% for ridging at sloping field. Screw type blades were attached on center drive rotavator shaft, gear set was deviled to reverse the rotavator, and it was good at need to adjust the width and height for ridge. As the results, required labor hours for ridging and vinyl mulching could be saved by 90% as compared to conventional manual method after cattle plowing, and by 50% as compared to conventional power tiller method.