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Volume 65, Issue 5
Displaying 1-21 of 21 articles from this issue
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M. KOIKE2003 Volume 65 Issue 5 Pages 1-2
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
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Kazufumi SHIMIZU2003 Volume 65 Issue 5 Pages 4-7
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
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Project Activities of Test and Evaluation for Agricultural Machinery in MexicoKazufumi SHIMIZU2003 Volume 65 Issue 5 Pages 8-11
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
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H. TANAKA2003 Volume 65 Issue 5 Pages 12-13
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
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H. SHITO2003 Volume 65 Issue 5 Pages 14-16
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
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H. GOTO2003 Volume 65 Issue 5 Pages 17-19
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
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Desrial, Nobutaka ITO2003 Volume 65 Issue 5 Pages 35-39
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIt was proved from the previous research reports that the application of pivot turn system with the control of ground contact length could be highly recommended for improving the turnability of the tracked vehicle equipped with straight pattern grouser track. However the reduction of the ground contact length of the braked track makes the concentration of the load acting on the braked track, and it results in the increase of track sinkage. The pivot height should be controlled easily and flxibly depending on the ground soil condition to maintain an enough bearing capacity of soil. The setting of the pivot height to achieve this control was done by the equipment of limit switch in the previous paper, however the adjustment of pivot height was not easily and flexibly performed. This paper discusses on the development and application of computer-based pivot turn control system for materializing the smooth and better turning.View full abstractDownload PDF (5133K) -
Quality Characteristics of Rough Rice Stored at Country ElevatorKazuhiro TAKEKURA, Shuso KAWAMURA, Kazuhiko ITOH2003 Volume 65 Issue 5 Pages 40-47
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSQuality characteristics of rough rice stored at country elevator in Hokkaido and under controlled storage conditions (room-temperature storage, low-temperature storage and -5°C storage) were examined. The quality of rough rice stored at country elevator by aeration with fresh chilly air in winter was better than that of the rough rice stored under low-temperature storage and that of the rough rice stored at the country elevator with natural heat radiation in winter. The combination of storage of the rough rice at a temperature below ice point and utilization of fresh chilly air in winter enables the quality of rice to be preserved at a high level, similar to that of freshly harvested rice, without the requirement of a cooling unit or electricity.View full abstractDownload PDF (1544K) -
Effect of Difference in Grain Temperatures during Storage on Rice QualityKazuhiro TAKEKURA, Shuso KAWAMURA, Kazuhiko ITOH2003 Volume 65 Issue 5 Pages 48-54
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe temperature of the rough rice near the inner silo wall gradually increased in spring and summer, whereas that of the rough rice in the center of the silo remained below ice point. The effect of this difference in rough rice temperatures in the silo on rice quality was investigated. There was no deterioration in the quality of rough rice near the silo wall, and the quality of the rough rice unloaded from silo after storage was uniform. These results indicate that there was no significant effect of the difference in grain temperatures in the silo on rice quality. The technique for storing rough rice at a temperature below ice point, i. e., super-low-temperature storage, at country elevators in cold regions using natural energy in winter was finally developed.View full abstractDownload PDF (1199K) -
Controller Designed as Constantly Scaled H∞ Control State Feedback ProblemYoshinobu NISHIIKE, Mikio UMEDA2003 Volume 65 Issue 5 Pages 55-63
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn this report, a design method of Model-following control system is constructed. About modeling of a vehicle, the vehicle model based on approximate 2 wheel model with prior information and estimated values of cornering power, is considered as nominal model. Moreover, spectral norm of the vehicle system's parametric perturbations is measured, and a design method in consideration of the effect is constructed. Controller is designed with a solution of constantly scaled H∞ control state feedback problem. To confirm following performance of the designed control system, running experimentation on concrete road was carried out. As the results, the designed controler made the side velocity and the yaw angular velocity of the test vehicle follow of the two reference models desirably.View full abstractDownload PDF (1357K) -
Comparison of predictive and experimental traction of track's grouserXiu Lun WANG, Nobutaka ITO, Koji KITO, Kunio SATO, Mitsushi YAMASHITA2003 Volume 65 Issue 5 Pages 64-69
Published: September 01, 2003
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 best tractive performance. The effects of the grouser thickness ratio and the grouser height on the traction generated the grouser shoe were predicted using a three-dimensional model of soil shearing. Then an experiment was conducted to validate the result of the model. Results showed that there was a significant effect of grouser thickness and grouser height on tractive performance of the tracked vehicle such 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 three-dimensional shearing model has been demonstrated for predicting the traction of grouser shoe.View full abstractDownload PDF (5273K) -
Toru TORII, Tsukasa TESHIMA, Tsuguo OKAMOTO, Kenji IMOU, Yutaka KAIZU, ...2003 Volume 65 Issue 5 Pages 70-75
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper describes a vision-based navigation system for a boom sprayer. A new algorithm is proposed for determining the position of a camera with respect to a row of rice plants from images of the paddy field. To obtain a good binary image (each pixel black or white), a threshold value was decided adaptively according to the water surface area and the growth stage. Our results show that the adaptive threshold decision and the detection of the water area worked well; the estimated offset error was within 20mm and the attitude angle error was within 0.2° from the early stages of rice growth to the late stage. Our algorithm was then tested in the field, and the vehicle traced the crop row to within a standard error of 26mm.View full abstractDownload PDF (8008K) -
Grass Cutting Characteristics and Energy RequirementBambang PURWANTANA, Hisashi HORIO, Koichi SHOJI, Tsuneo KAWAMURA2003 Volume 65 Issue 5 Pages 76-83
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA flail-type rotary cultivator is efficacious for swampy land preparation, grass cutting and topsoil treatment. The cutting characteristics of the cultivator were studied in the laboratory to determine the energy requirement for cutting grass stems. The cutting speed was significantly effective in the cutting process. The specific energy required decreased by approximately 58% when the cutting speed increased from 10 to 25m/s. Effective cutting was achieved at cutting speeds of over 20m/s. The bent angle of the knife did not significantly affect the specific cutting energy, although less energy was required at bent angles between 90° and 102°. The specific energy required was less when the grass stems inclined towards the machine and when cutting a single stem rather than a bunch of stems. The effect of the number of stems in a bunch on the specific energy decreased as the cutting speed increased.View full abstractDownload PDF (7192K) -
Improvement of Handling Ability of Agricultural TractorsQiang ZHANG, Tsuyoshi HONMA, Tomohiro TAKIGAWA, Masayuki KOIKE2003 Volume 65 Issue 5 Pages 84-91
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA computer controlled front loader was developed to improve handling ability of agricultural vehicles. Experimental front loader having one more degree of freedom than traditional one was constructed. Then computer controller was designed to guide a bucket of the front loader with following given straight or curved locus. Experimental results with a feed-forward based controller showed that the bucket of the front loader followed a given locus with positional error of 3cm. To improve locus tracking ability, feedback control designed by taking account delay of hydraulic valves was introduced. By the introduction of feedback function the displacement from locus was reduced less than 2cm. Then the developed controller was used to assist human operator to handle a heavy object, and it was confirmed that inexperienced operators could handle a heavy object by use of a joystick.View full abstractDownload PDF (3389K) -
Mowing Devices and PerformanceSumihiko MIYAHARA, Koichi TOSAKI, Tomohiko ICHIKAWA, Kohshi KUROMI2003 Volume 65 Issue 5 Pages 92-99
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSBush cutter is the most popular for mechanical weeding on ridges of paddy fields.
But there is the problem that low work efficiency and unstable work posture by using bush cutter caused heavy work load. Then, we developed the new self-propelled walking type mower, which could mow the top and one slope surface of a ridge simultaneously.
The mower has mowing devices, which at the mowing width for the top surface was 30cm, and that for a slope surface was possible to adjust within the range from 30 to 70cm. Its traveling unit has 2-wheel drive system with front-wheel steering mechanism, which could work and move stable on the ridge. As the test results, the mower worked smoothly, and the work efficiency by the mower was about 2 times that of weeding by a bush cutter, when the width of top surface was 45cm, and the widths of slopes were 70cm and 30cm.View full abstractDownload PDF (7448K) -
Determination of Bulk Density and Starch Viscosity (Falling Number) in High-Moisture WheatMotoyasu NATSUGA, Akitoshi NAKAMURA, Shuso KAWAMURA, Kazuhiko ITOH2003 Volume 65 Issue 5 Pages 100-107
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWheat quality is evaluated by its bulk density and starch viscosity expressed as Falling Numbers (FN). Both are currently measured with dedicated devices. Near-infrared (NIR) instruments are being introduced at drying and processing facilities for wheat to measure the moisture and protein content in high-moisture wheat. If they can be used to estimate these parameters, they may help to reduce labor at these facilities. We carried out experiments in order to examine the accuracy of NIR instruments for these parameters using high-moisture wheat samples in Hokkaido through the year of 1999 and 2001. As a result, the bulk density could be estimated with an accuracy of r2=0.77 and SECV=18g/L, which was adequate for classifying low quality from high quality wheat. The estimation accuracy of FN calibration was r2=0.49 and SECV=63s. While these values were less accurate than those of the bulk density (particularly below 300s in the low-amylogram region), they still were as applicable to classifying low quality wheat from high quality one as the bulk density calibration was. Although more samples should be investigated to both the bulk density and FN calibrations, these values could be used in a two-stage classification of high-moisture wheat in which an NIR instrument is used as a preliminary classifier in the first stage. This could help to reduce labor at drying and processing facilities.View full abstractDownload PDF (4861K) -
Application of Gantry to Rotary Tillage and Ridging Work, and Automatic Transfer to a Neighboring RidgeJun YAMASHITA, Shoichi YUKI, Seiichi ARIMA, Daisuke TAMAI, Kazunobu SA ...2003 Volume 65 Issue 5 Pages 108-116
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn previous report (Part I), two gantries were prototyped, and it became clear that the prototyped sprayer and strawberry picker on gantry are effective in saving labor for spraying and picking work. In this paper, to enhance general-purpose properties of gantry, the applicability of gantry to rotary tillage and ridging work, using a commercially available rotary tiller and ridger, was studied. The working performance test of the gantry showed that with a 7-kW motor for driving operation machine, a running speed of gantry for rotary tillage at less than 30cm/s and that for 25cm high ridging work at less than 14cm/s, the gantry works flawlessly. The soil pulverizing performance, theoretical field capacity, and ridge shaping accuracy of the gantry were equivalent to conventional operation. In addition, a prototype truck controlled by a programmable device for transferring the gantry to a neighboring ridge was developed, and its performance was confirmed.View full abstractDownload PDF (8466K) -
Present Situation Analysis of Lettuce Harvest Work and Examinations of Cutting MechanismHisatoshi SUZUKI2003 Volume 65 Issue 5 Pages 117-123
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe purpose of this research was to develop a practical lettuce harvester that would save manual labor and improve the work burden. During this research we examined and analyzed the present methods of lettuce harvesting in a main producing area-Nagano, Japan. We did this by referring to the IE technique and then put together the concept to develop a practical lettuce harvester. We also made it clear in a “disc guide method” that it is worth putting the harvester to use as a cutting mechanism. This is the most important technical element for the development of the lettuce harvester.View full abstractDownload PDF (3217K) -
Improvement of Cutting Mechanism and Development of Conveyance DeviceHisatoshi SUZUKI2003 Volume 65 Issue 5 Pages 124-132
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSOur first step was to develop a cutting mechanism. The “parallel link disc guide system” which we developed is a simple mechanism. It enables the machine to cut off the lettuce almost perfectly without damage by devising the position of a fixed blade and supporting parts. This cutting mechanism is also capable of cutting Chinese cabbage with the adjustment of the position of the parts. We tested the device in the field after adjusting the heights of the blade. It proved to be difficult to cut off lettuce heads of a consistent, standard size. Therefore, after considering the characteristics of conveyance devices of other vegetable harvesters, we developed a conveyance device which lifts up lettuce smoothly. This test machine —a combination of these cutting mechanism and conveyance device— proved that it is possible to cut off the lettuce heads and lift them up without causing them any damage.View full abstractDownload PDF (8742K) -
Poritosh ROY, Naoto SHIMIZU, Toshinori KIMURA2003 Volume 65 Issue 5 Pages 133-141
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSLocal parboiling processes (vessel, small boiler, medium boiler) were evaluated at Gazole under the Malda district in West Bengal, India. The energy consumption and the qualities of the parboiled rice produced in the vessel, small boiler and medium boiler process were measured. The initial installation cost of parboiling facilities was also worked out. Little difference in hardness value was observed among the processes. The color and lightness values were found to be the same in all processes. The parboiled rice produced under small and medium boiler methods had higher customer acceptance and market value compared to the vessel process but required higher initial installation cost. The small and medium boiler processes were found to be less tedious and provide better working environment compared to the vessel process. Among the studied processes, the medium boiler consumed the lowest amount of energy (1659MJ/t). The experimental results reveal that the local parboiling process can be improved in terms of energy consumption and market value of parboiled rice by adopting the medium boiler process.View full abstractDownload PDF (9642K) -
Hisaya YAMADA2003 Volume 65 Issue 5 Pages 142-149
Published: September 01, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the basic research for the development of the grafting robot, the fitting ratio of a scion to a rootstock on the cutting surface, the fixing force of the clip and durability of hypocotyl cutters were tested using tomato seedlings.
As the results of the researches, know-how which has been known empirically among farmers has been analyzed quantitatively and qualitatively. And these results have been utilized for the development of the full automatic grafting robot for Solanaceae.View full abstractDownload PDF (11039K)
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