• 기계와재료
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• 제11권2호통권40호
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• pp.79-88
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• 1999

• 농업과학연구
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• 제37권2호
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• pp.295-302
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• 2010

Electro-hydraulic transmission (HST) and an electronic control system was designed, and performance of the components were investigated through indoor tests. When input values for HST swash plate control were given at 3 levels (5, 10, 13 degrees) in forward and reverse directions, the errors were less than 0.6 degrees. Response time was in ranges of 0.14 ~ 0.16 s and 0.16 ~ 0.2 s for forward and reverse direction controls while driving, and the values were 0.23 ~ 0.25 s and 0.18 ~ 0.23 s at static condition, respectively. Similar experiments for left and right steering resulted errors less than 0.5 degrees. Resonse time was in ranges of 0.16 ~ 0.22 s and 0.11 ~ 0.23 s for left and right turns while driving, and the values were 0.07 ~ 0.21 s and 0.09 ~ 0.14 s at static condition, respectively. From frequency response experiments, control system appeared to follow sine waves appropriately at frequencies less than 0.8 Hz with gain of 0.11 dB and 0.09 dB for forward and reverse direction controls, respectively, and the gain decreased above the frequency. Phase difference showed a gradual increase and were less than 45 degree up to 0.8 Hz. Similar experiments for left and right streering showed that the control system appeared to follow sine waves appropriately at frequencies less than 0.8 Hz with gain of 0.28 dB and 0.26 dB for left and right steering controls, respectively, and the gain decreased above the frequency. Phase difference showed a gradual increase and were less than 45 degree up to 0.8 Hz, which was the same as for the forward and reverse controls.

• 농업과학연구
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• 제38권1호
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• pp.121-128
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• 2011

I/An electro-hydraulic transmission having advantages of convenience, safety, simple linking and high power, and an electronic control system were designed and fabricated. In this study, characteristics of the control system were investigated through outdoor tests for evaluation of installation of the system on a combine. Major findings were as followings. 1. Experiment for performance evaluation of the control system was conducted on concrete road. With steering lever in neutral position, driving HST swash plate and left/right wheel speed increased in proportion to driving lever angle. In case of steering control, steering swash plate angle changed in proportion to steering lever angle. This should cause increase in outer wheel speed, but it was observed that HST swash plate was controlled toward neutral to maintain the speed before steering. As a result, speed before steering was maintained despite the change in outer wheel speed by steering HST swash plate angle change. 2. It was observed that the HST system enabled steering with outer wheel maintained at constant speeds while inner wheel speed decreased, which was more stable than conventional mechanical links. In addition, for the selected 5 criteria, experiment showed satisfactory results and it was judged that installation on real vehicle would be feasible. 3. The control system showed response property of appropriate forward/reverse movement and lift/right steering, without causing any problems during experiment on concrete. Result of response property experiment on field operation also showed appropriate control over forward/reverse movement and left/right steering.

• 한국산림과학회지
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• 제100권2호
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• pp.154-164
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• 2011

본 연구는 우리나라 험준한 급경사 지형의 단목중심의 목재생산시스템 등에 적합하고 사방사업, 임도사업 등의 다양한 산림작업에 유용하게 활용할 수 있는 다목적의 반궤도식 산림작업차 개발을 목적으로 실시하였다. 산림작업차량의 기본 차체는 최소회전반경 설계기준과 작업도 폭을 고려하여 차체프레임부의 총길이는 5,750 mm, 차체의 폭은 1,900 mm, 적재부의 적재용량은 약 $2.5m^{3}$으로 설계 제작하였다. 동력원은 3,400 rpm의 최대 96마력 출력의 엔진을 선정하였으며, 유압펌프는 2개의 주펌프와 2개의 보조펌프로 나누어 선정하고, 주펌프는 전후좌우 4개의 주행용 유압모터에 사용하고, 보조펌프는 각종 작업기에 사용하도록 설계 제작하였다. 동력전달방식은 HST(Hydro-Static Transmission) 시스템을 적용하였고, 주행부는 조향가능한 전방 고무바퀴와 무한 궤도형으로 회전하는 후방 크롤러로 설계 제작하고, 조향방식은 애커만 조향방식을 채택하였다. 주행조작부는 일반 자동차의 운전 및 운전석 형태로 설계 제작하였으며, 보조장치로 윈치와 로그그래플 및 아웃트리거를 장착하였다. 시작기의 공차시 임도의 주행속도는 저속 5.3 km/hr, 고속 7.7 km/hr로 나타났다.