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Volume 64, Issue 4
Displaying 1-12 of 12 articles from this issue
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K. WATANABE2002 Volume 64 Issue 4 Pages 1-2
Published: July 01, 2002
Released on J-STAGE: April 30, 2010
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Yasuo OHSHITA2002 Volume 64 Issue 4 Pages 4-8
Published: July 01, 2002
Released on J-STAGE: April 30, 2010
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Yukio YAJI, Tatsushi TOGASHI2002 Volume 64 Issue 4 Pages 9-13
Published: July 01, 2002
Released on J-STAGE: April 30, 2010
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Akio OGURA2002 Volume 64 Issue 4 Pages 14-16
Published: July 01, 2002
Released on J-STAGE: April 30, 2010
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Mitsuho SUGIMOTO2002 Volume 64 Issue 4 Pages 17-21
Published: July 01, 2002
Released on J-STAGE: April 30, 2010
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K. KUWAHARA2002 Volume 64 Issue 4 Pages 22-23
Published: July 01, 2002
Released on J-STAGE: April 30, 2010
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Effect on thrust, rolling resistance and tractionXiu Lun WANG, Nobutaka ITO, Koji KITO2002 Volume 64 Issue 4 Pages 55-60
Published: July 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe purpose of this study is to find the optimum dimension of grouser shoe of tracked vehicles for maximum tractive performance. A device was constructed for measuring thrust and sinkage generated by a single grouser shoe. Series of experiments were conducted in an experimental soil bin using different grouser thickness and height. The rolling resistance and traction generated by the grouser shoe were calculated using sinkage data obtained in the experiment. Results showed that the thinner the grouser thickness, the greater traction is generated. For any given grouser thickness ratio however, an optimum grouser height that gives the best traction can be observed. The results of the experiments showed the important role of grouser thickness and height in generating thrust.View full abstractDownload PDF (1032K) -
Rotary Tillage Operation using Walking Type TractorM. Faiz SYUAIB, Shoji MORIIZUMI, Hiroshi SHIMIZU2002 Volume 64 Issue 4 Pages 61-67
Published: July 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis research is mainly conducted to obtain basic ergonomic data about tractor operator performance and to analyze the mastering process of tractor operation, especially walking types. This paper mainly deals with the analysis of learning curve patterns of beginner operators to assess the necessary expertise level through a comparison with skillful operators.
In the results, we noted that there was positive correlation between physiological strain levels and the levels of technical performance. We thought that the high error levels of the beginners in the beginning of their operation experience were strongly affected by the high mental pressure and inefficient task motion, which was expressed by the high level of physiological strain. The physiological strain level decreased as technical error decreased. The analysis results proved that about 24 hours of effective-working time was necessary for beginners to reach the necessary level of performance and psychological stability. In this regard, we define 3 steps of mastering process of the tractor operation in this paper.View full abstractDownload PDF (1196K) -
Discrimination of the number and kinds of beans in the pod and the distorted soybean using shape analysisMasaru TOKUDA, Hiroaki YAMAMOTO, Tsuneo KAWAMURA, Hiromichi ITO, Zenno ...2002 Volume 64 Issue 4 Pages 68-75
Published: July 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe purpose of this study is to develop a soybean sorting system capable of detecting distorted soybean and of detecting the number and kinds of the beans in the pod. Top view of the soybeans was used for image processing. The method of using the centroid radius with peak adjustment was contrived for detecting the long axis, which comprises stem and tip. The centroid displacement was used for the parameters to detect the distorted soybeans. The relationship between the long and short axes of the soybean is used to determine the number of beans. The beans were correctly identified at 98.8%. The distorted soybeans were correctly identified at 100%.View full abstractDownload PDF (4655K) -
The Steering Controller Applied Optimal ControllerMichio KISE, Noboru NOGUCHI, Kazunobu ISHII, Hideo TERAO2002 Volume 64 Issue 4 Pages 76-84
Published: July 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper reported about new steering control algorithm. The steering controller developed in previous paper was designed to guide along with a straight path, and it didn't confirm the accuracy of following a curved path. But the robot tractor has to have a function to travel along any curved path precisely to achieve farm management by the robot. The steering control algorithm applied a linear optimal regulator was developed and tested at a field with some curved paths. The developed system showed the outstanding guidance performance comparing to a conventional method which uses a PI controller on all types of the paths including a 90 degree turn, a sinusoidal, and a forward turning paths. In addition, the developed controller could perform high-speed guidance at 3.0m/s more precisely than the conventional PI controller.View full abstractDownload PDF (1471K) -
Algorithm for teat cup attachment and field trails of a milking robotMitsuru HACHIYA, Akira HIRATA, Takashi KUWANA, Yoshitaka IBARAKI, Yosh ...2002 Volume 64 Issue 4 Pages 85-95
Published: July 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAn algorithm to attach and release teat cups using, an articulated robot manipulator with a 4 degrees of freedom, has been developed. For successful teat cup attachment the articulated robot manipulator must be able to adjust to subtle angles and various movements. The cups follow a Lissajous figure on the XY horizontal plane. A local sensor determines the center of the teat, and the end effector raises the cup to the teat. A vacuum holds the cup in place. Field trials for the milking robot system were done with two milking cows. The “Global Positioning Arm” (GPA) was not sufficiently accurate to allow only recorded teat positions related to body to be used for attachment but are generally good enough for the initial approach to the teat. Local sensor could then detect error and allow for centering the cup on the teat. The GPA always maintains contact with the body of the cow, enables the automatic milking unit to maintain a relative position and smoothly follow teat movements for easy automatic milking. The automatic attachment of the teat cups was achieved in approximately 60 [sec]. Teat cup vacuum decreased from 48 [kPa] to 20 [kPa] in less than 0.2 [sec] after attachment, which means that attachment required minimal air inflow. These results showed that the milking robot is a practical milking system.View full abstractDownload PDF (5769K) -
Development of the Roll Baler for Chopped MaterialHirokatsu SHITO, Nobuki YAMANA2002 Volume 64 Issue 4 Pages 96-101
Published: July 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe roll baler for chopped material, which could form chopped maize in approximately 10mm into a roll bale of 90cm diameter, and could be operated by one person, was developed in order to reduce heavy labor and to minimize work force in maize harvesting. It obtained to form the chopped material into a roll bale by employing the chamber structure which made falling loss little, and the net which width was wider than width of roll bale. As the result of maize harvesting test using 44kW tractor and single low forage harvester, it was possible to get the excellent shape roll bales, which dry matter density was 208kg/m3 on average, and the production loss of 1.6% on average. It was possible that the roll baler was operated at working speed of 1.1m/s when the maize didn't fall.View full abstractDownload PDF (4260K)
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