JOURNAL of the JAPANESE SOCIETY of AGRICULTURAL MACHINERY
Online ISSN : 1884-6025
Print ISSN : 0285-2543
ISSN-L : 0285-2543
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Volume 72, Issue 3
Displaying 1-17 of 17 articles from this issue
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ESSAY
SPECIAL EDITION
TECHNO-TOPICS
RESEARCH ACTIVITIES
PAPERS (Articles)
RESEARCH PAPERS
  • Automatic Guidance System in Real-time Orchard Application (Part 2)
    ——Development of Low-cost and Small Scale Electronic Robot Vehicle for Orchard Application——
    Oscar C. BARAWID Jr., Noboru NOGUCHI
    2010 Volume 72 Issue 3 Pages 243-250
    Published: May 01, 2010
    Released on J-STAGE: March 05, 2013
    DOIhttps://doi.org/10.11357/jsam.72.243
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    The objective of the research was to develop a low-cost and small scale robot vehicle for an orchard application. The platform used was an electronic utility vehicle also called as E-GATOR. The electronic vehicle was modified into a robot vehicle that can control functions such as steering, movement (forward, backward, neutral), vehicle speed, and emergency stop (by manual and remote control). The robot vehicle was tested to run autonomously on a straight-line path using an RTK-GPS (real-time kinematic global positioning system) and an IMU (inertial measurement unit) as the navigation sensors. The results showed that the robot vehicle could follow the straight-line path with lateral and heading RMS errors of 0.08m and 1.2deg, respectively.
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  • Studies on Measuring Method of Respiration Rates of Fruits and Vegetables (Part 2)
    ——Identification of Error in Respiration Rate and Conditions Required for Conventional Formula and Proposal of Modified Formula for a Flowing System in a Steady State——
    Yoshinori KAWAGOE, Itaru SOTOME, Seiichi OSHITA, Yasuhisa SEO
    2010 Volume 72 Issue 3 Pages 251-261
    Published: May 01, 2010
    Released on J-STAGE: March 05, 2013
    DOIhttps://doi.org/10.11357/jsam.72.251
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    In the conventional formula for a flowing system the rate of outflow is considered to be the same as the inflow. The difference is strictly recognized when respiratory quotient deviates from one. Therefore, a modified formula for a flowing system including ethylene was derived for the gas exchange among the commodity, inside and outside of a respiratory chamber. The error obtained in the respiration rate using the conventional formula showed that it was dependent on the respiratory quotient, ethylene production ratio, and outflow concentration. A modified formula in a steady state, which was independent of these factors, is proposed. The conditions of the conventional formula, which can be used, were identified. Furthermore, a method for determining the flow rate and the time at which measurements should be started was determined.
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TECHNICAL PAPERS
  • Development of Novel Method for Measuring Degree of Glassiness of Rye
    Shigeki INABA
    2010 Volume 72 Issue 3 Pages 262-267
    Published: May 01, 2010
    Released on J-STAGE: March 05, 2013
    DOIhttps://doi.org/10.11357/jsam.72.262
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    In this study, a novel method to measure the degree of glassiness of rye using an image scanner was developed. It was found that to setting the threshold value of the brightness between 66.7% and 70.6% was optimal for distinguishing the powdery area from the glassy area of rye on a blue color composite image, as judged from the absorbance of the glassy and powdery areas. It was also found that the proposed method, which does not classify the obtained images, is more effective than the currently used standard method.
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  • The Method of Controlling Biogas Input in Biogas-Diesel Dual-Fuel Engine
    Sohei WAKABAYASHI, Nizar JABER, Noboru NOGUCHI
    2010 Volume 72 Issue 3 Pages 268-275
    Published: May 01, 2010
    Released on J-STAGE: March 05, 2013
    DOIhttps://doi.org/10.11357/jsam.72.268
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    Biogas made from organic waste, has been used for various applications, including engines. Feeding biogas into the intake manifold of compression ignition engine reduces diesel consumption from one side but on the other side, it increases CO emission and BSHC (Break Specific Heat Consumption) during low loads. This research studies the characteristics of dual-fuel tractor engines using different biogas control methods. Biogas feeding was controlled using 3D-look-up tables optimized for three different objectives. Engine performances as well as emissions were measured and a field test simulation was made.
    The dual-fuel engines have almost same power and torque characteristics as diesel engines. Emission tests results showed that the optimized biogas supply maps were attained the research objectives. The best BSHC curve gave the lowest energy consumption, and diesel consumption was minimized by best reduction map. Field simulation test estimated possible results of actual operations powered by the dual-fuel tractor.
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  • Paddy Weeding Using an Autonomous Rice Transplanting Robot
    ——Evaluation of Traveling Accuracy and Effect on Seedlings——
    Masahiro SAITO, Yoshisada NAGASAKA, Katsuhiko TAMAKI, Kyou KOBAYASHI
    2010 Volume 72 Issue 3 Pages 276-282
    Published: May 01, 2010
    Released on J-STAGE: March 05, 2013
    DOIhttps://doi.org/10.11357/jsam.72.276
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    The weeding efficiency of a weeding robot was tested in a paddy field. We replaced the transplanting unit of a rice transplanting robot developed at the National Agricultural Research Center with a weeding unit. Deviation of the weeding track from the transplanting track was 0.02m (RMS) and the extent of rice damage ranged from approximately 2% in 30cm-wide crop rows to 8% at the headlands, indicating that the weeding robot was capable of weeding without damaging the rice in approximately the same transplanting track. Additionally, the resulting field work efficiency was 22a/h, which was equivalent to that of a human-operated weeding machine. The weeding robot thus has acceptable driving accuracy and achieves labor-savings through unmanned operation.
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  • Development of Large-size Truss Greenhouse with Wind-resistant Features Using Resin Joints
    Maro TAMAKI, Takeshi TOUMA, Takeshi SHIKANAI, Toru AKACHI, Takahiko SH ...
    2010 Volume 72 Issue 3 Pages 283-290
    Published: May 01, 2010
    Released on J-STAGE: March 05, 2013
    DOIhttps://doi.org/10.11357/jsam.72.283
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    In recent years, the intensity of typhoons has increased causing great damage to gardening facilities in not only Okinawa but also the mainland of Japan. For example, typhoon 0314, which recorded a maximum instantaneous wind velocity of 74.1m/s, caused considerable damaged to greenhouses in the Ryukyu Islands. We tried to apply the truss structure to large-scale greenhouses. However, the introduction of such a structure involves very high costs. For implementation in agriculture, it is necessary to reduce the cost of introducing such a structure. In this study, we developed a large-size greenhouse with the truss structure at low cost using resin joints, which are lightweight and inexpensive.
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  • Study on the Conditions and Quality of GABA Enriched Brown Rice
    Qingyun LU, Kiyokazu GOTO, Takahisa NISHIZU
    2010 Volume 72 Issue 3 Pages 291-296
    Published: May 01, 2010
    Released on J-STAGE: March 05, 2013
    DOIhttps://doi.org/10.11357/jsam.72.291
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    GABA enriched brown rice is one of the healthy foods marketed as “Germination brown rice”. In this report, the effects of GABA enriching conditions (temperature, time, aeration etc.) on the qualities of the germination brown rice such as GABA content, germination rate, grain mass losses were examined. In order to inhibit the breeding of bacteria during the water absorption process, the usage of electrolyzed acid water was examined. It was found that there were various relations of enriching conditions and quality of brown rice.
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