| Project/Area Number |
02556019
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
林学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
MINAMIKATA Yasushi Univ. of Tokyo, Fac. of Agric., Emeritus Professor, 農学部, 名誉教授 (00011841)
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| Co-Investigator(Kenkyū-buntansha) |
NITAMI Toshio Univ. of Tokyo, Fac. of Agric., Univ. For., Associate Professor, 農学部(林), 助教授 (20192255)
YAGI Hisayoshi Univ. of Tokyo, Fac. of Agric., Associate Professor, 農学部, 助教授 (80191089)
SAKAKI Hideo Univ. of Tokyo, Fac. of Agric., Associate Professor, 農学部, 助教授 (70126069)
SASAKI Satohiko Univ. of Tokyo, Fac. of Agric., Professor, 農学部, 教授 (20196158)
KOBAYASHI Hiroshi Univ. of Tokyo, Fac. of Agric., Professor, 農学部, 教授 (00111394)
丹下 健 東京大学, 農学部, 助手 (20179922)
及川 良一 (株)及川自動車, 研究員
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| Project Period (FY) |
1990 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥14,800,000 (Direct Cost: ¥14,800,000)
Fiscal Year 1992: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1991: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1990: ¥9,800,000 (Direct Cost: ¥9,800,000)
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| Keywords | Silvicultural work / Semi-legged vehicle / Steep and rough terrain / Weeding / Working accuracy / Mechanization / Control system / Hardware control / 急傾斜森林 / 下刈作業精度 |
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| Research Abstract |
In order to get high operational efficiency of silvicultural operations which need rapid move at steep hillsides, a control system for semi-legged vehicle which may have high possibility to obtain good trafficability at steep terrain was developed and the operation system for site-preparation and plantation was also developed. A full scale semi-legged vehicle was built up, and its control system and mechanical alignments are had been developing. The influences on the seedlings growth from the under bush cleaning were surveyed by differentiating degree of bush cleaning around seedlings.
Improving the vehicle
Examinations on the strength and the moving speed of the vehicle had result of making it smaller Its legs were made shorter, and its body was made smaller. And its hydraulic cylinder was changed into larger one, and it got extra hydraulic pumps. Now, its engine is changing into larger one.
Improvement on the control system
The sensor on the angle of front legs were changed from fragile encoder into popular potentiometer. A part of control system was changed into hardware control with Pulse Modulation wave generator (Toshiaki TASAKA et. al. 1993). This made the vehicle's moving smoother.
Relationship between weeding method and growth of seedlings
The effects of weed remained around a seedling on the growth of a seedling was different in species. It was cleared that a seedling which is two times taller than other grasses isn't easily effected on its growth (Takeshi TANGE et. al. 1992). There is no serious damage on the growth of a seedling with weeding remained around a seedling. This means that the mechanization of weeding on steep and rough terrain has good possibilities.
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