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 5
Displaying 1-20 of 20 articles from this issue
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ESSAY
SPECIAL EDITION
TECHNO-TOPICS
MINI REVIEW — LECTURE
RESEARCH ACTIVITIES
PAPERS (Articles)
RESEARCH PAPERS
  • Dynamic Behaviors of Farm Tractor Passing over an Obstacle (Part 1)
    ——Improvement of Tractor Dynamic Model and Measurement of Tire Stiffness——
    Jun-ichi TAKEDA, Masaru SHIMADA, Yutaka KIKUCHI, Makoto NAKANO, Shunsu ...
    2010 Volume 72 Issue 5 Pages 457-463
    Published: August 25, 2010
    Released on J-STAGE: March 12, 2013
    DOIhttps://doi.org/10.11357/jsam.72.457
    JOURNAL FREE ACCESS
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    The objective of this research work is to analyze dynamic behavior of farm tractor passing over sine wave bump when the both side of the tires are passing through simultaneously. The model was formulated more effectively to express actual tractor motions by considering tire effective radius. And the tire stiffness that affects strongly to tractor motions were measured and evaluated by three methods.
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  • Dynamic Behaviors of Farm Tractor Passing over an Obstacle (Part 2)
    ——Analysis on Validation for Improved Dynamic Model——
    Jun-ichi TAKEDA, Masaru SHIMADA, Yutaka KIKUCHI, Makoto NAKANO, Shunsu ...
    2010 Volume 72 Issue 5 Pages 464-470
    Published: August 25, 2010
    Released on J-STAGE: March 12, 2013
    DOIhttps://doi.org/10.11357/jsam.72.464
    JOURNAL FREE ACCESS
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    In this research work, tractor dynamic behavior when it is passing over an obstacle was described. The simulation was performed by applying the dynamic model that considered tractor tire radius as it was proposed in part 1. The simulated and actual results were evaluated and their validity investigated. Results were in good agreement with actual results for tractors alone and tractors with rotary tiller confirming the validity and versatility of the proposed dynamic model.
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  • Effects of Different Leaf Position on Leaf Color Measurements for a Soybean Community and Advantages of Transmitted Light Utilization
    Rintaro OKUNO
    2010 Volume 72 Issue 5 Pages 471-478
    Published: August 25, 2010
    Released on J-STAGE: March 12, 2013
    DOIhttps://doi.org/10.11357/jsam.72.471
    JOURNAL FREE ACCESS
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    This study investigated error factors of leaf color measurement attributable to the soybean community structure and the direction of illuminant. Results of SPAD value measurements of individual leaves in different leaf positions clarified that those of leaves in lower positions differ from those of leaves in upper positions. The average SPAD value of the upper three leaves is useful as a representative value of the community. Results of measuring the multidirectional spectrum properties of reflected and transmitted light from an individual soybean leaf show that, compared to using reflected light, measuring with transmitted light decreases measurement error attributable to incident angles.
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  • Development of a Stationary Robotic Strawberry Harvester with Picking Mechanism that Approaches Target Fruit from Below (Part 3)
    ——Performance Test with a Movable Bench System——
    Satoshi YAMAMOTO, Shigehiko HAYASHI, Hirotaka YOSHIDA, Ken KOBAYASHI
    2010 Volume 72 Issue 5 Pages 479-486
    Published: August 25, 2010
    Released on J-STAGE: March 12, 2013
    DOIhttps://doi.org/10.11357/jsam.72.479
    JOURNAL FREE ACCESS
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    We constructed a stationary robotic strawberry harvester consisting of an end-effector and manipulator with seven degrees of freedom (Yamamoto et al., 2009) and an artificial visual system for target fruit identification (Yamamoto et al., 2010). The stationary robot was tested in an experimental harvesting system in which the robot was combined with a movable bench unit. We examined the performance in 50 beds, each of which contained 10 strawberry plants. The success rate of harvesting mature fruit was 67.1%, the success rate of detecting fruit position was 89.0%, the rate of correct judgment of fruit coloration was 83.4%, and the success rate of picking detected fruit was 90.3%. The rate of damaged harvested fruit was 12.5% and the rate of picking the other fruits simultaneously was 13.9%. The average processing time per bed was 126.7 s when the average number of mature fruit in the bed was 2.3.
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TECHNICAL PAPERS
  • Sugar Content Prediction of Fresh Prune Fruit Using NIR Spectroscopy
    Yoichiro KOJIMA, Sakae SHIBUSAWA, Masakazu KODAIRA, Hiroki UMEDA, Kaor ...
    2010 Volume 72 Issue 5 Pages 487-492
    Published: August 25, 2010
    Released on J-STAGE: March 12, 2013
    DOIhttps://doi.org/10.11357/jsam.72.487
    JOURNAL FREE ACCESS
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    NIR spectroscopy was applied to estimate the sugar content of fresh prunes. The NIR spectrometer used in the experiment detected spectral absorbance in the wavelength range of 710 to 949nm at 1nm interval. With the second derivative spectra, calibration models were developed for various combinations of wavelength ranges. In the 750 to 939nm wavelength range, R2=0.91, SECV=0.61 Brix% were obtained.
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  • Fuel Savings from Operating Condition Indicator on Agricultural Tractor (Part 1)
    ——Indoor Tests, Rotary Tilling Tests and Mole Drainage Tests——
    Takashi GOTOH, Tsukasa TESHIMA, Yasuroh SUGIURA, Hiroyuki TAKAHASHI, K ...
    2010 Volume 72 Issue 5 Pages 493-499
    Published: August 25, 2010
    Released on J-STAGE: March 12, 2013
    DOIhttps://doi.org/10.11357/jsam.72.493
    JOURNAL FREE ACCESS
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    A prototype system that indicates the operating conditions to enable the operator to reduce fuel consumption was mounted on a 24kW agricultural tractor and subjected to indoor dynamometer tests, rotary tilling tests and mole drainage tests. By changing the operating conditions (traveling gear, PTO gear, and engine speed) according to the indications of this system, the operator could reduce fuel consumption by about 15% at a power ratio (the ratio of working power to the maximum PTO output) of 55 to 65%, by 25 to 30% at a power ratio of 35 to 40%, and by 35 to 45% at a power ratio of about 20% with full throttle. Moreover, with 2/4 throttle, the operator could reduce fuel consumption by 10 to 20% at a power ratio of 10 to 25%.
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  • Fuel Savings from Operating Condition Indicator on Agricultural Tractor (Part 2)
    ——Fertilizing Tests, Cultivating Tests and Estimation of Effect on Systematic Utilization——
    Takashi GOTOH, Tsukasa TESHIMA
    2010 Volume 72 Issue 5 Pages 500-508
    Published: August 25, 2010
    Released on J-STAGE: March 12, 2013
    DOIhttps://doi.org/10.11357/jsam.72.500
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    A prototype system that indicates the operating conditions to enable the operator to reduce fuel consumption was mounted on a 24kW agricultural tractor and subjected to fertilizing tests and inter-row cultivating tests. By changing the operating conditions (traveling gear, PTO gear, and engine speed) according to the indications of this system, it was possible to reduce fuel consumption by about 45% at a power ratio (the ratio of working power to the maximum PTO output) of about 20% with full throttle and by about 10% at a power ratio of 25 to 30% with 2/4 throttle. Furthermore, the effects of using this system for 15 types of work were estimated for the area under management of 12ha of paddy and 8ha of double cropping soybean-wheat. This resulted in a fuel savings of 174L/year at a cost reduction of 15,000 yen/year (assuming the price of diesel oil was 85 yen/L).
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