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 50, Issue 4
Displaying 1-24 of 24 articles from this issue
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  • Information Processing for Agricultural Machinery Development from an Industrial Standpoint
    T. KOBAYASHI
    1988 Volume 50 Issue 4 Pages 1-2
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_1
    JOURNAL FREE ACCESS
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  • Agricultural Machinery and Information Processing
    T. FURUKAWA
    1988 Volume 50 Issue 4 Pages 3-4
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_3
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  • Information Processing of Agricultural Machinery in Education
    T. KONAKA
    1988 Volume 50 Issue 4 Pages 5-6
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_5
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  • Improvement in the Brake Thermal Efficiency of the Small Diesel Engine for Farm Use by Alcohol Fumigation (Part 2)
    Engine Performance of Alcohol Fumigation
    Hideo TERAO, Kazuhiko OHMIYA, Noboru NOGUCHI
    1988 Volume 50 Issue 4 Pages 7-15
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_7
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    In the previous paper (Part 1), the tested engine was remodeled in order to utilize fumigated alcohol in a diesel engine. When supplying alcohol to the diesel engine, it was observed that the optimal injection timing of the engine with the precombustion chamber was at BTDC 4°CA.
    The performance of the diesel engine was determined in terms of brake horsepower, brake thermal efficiency, smoke density, emissions and noise. Therefore, in this paper, the performance of the engine at injection timing of BTDC 4°CA with methanol fumigation was compared with that of the same engine operation with diesel fuel only, and we tested the engine with fumigation of ethanol which is one of promising fuels for diesel fuel substitution. It was concluded from the experiments that brake horsepower and brake thermal efficiency were improved and smoke density decreased. On the other hand, it was pointed out the problems of alcohol fumigation that HCHO and unburned alcohol were discharged and noise level rose.
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  • The Leaf Valve and the Delivery Ratio in a Small Two-Cycle Engine for Agricultural Machinery
    Kazuo SATO, Masamitsu NAKANO
    1988 Volume 50 Issue 4 Pages 17-24
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_17
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    Two-cycle gasoline engines of small size have been used widely as the power source for agricultural machinery. If its power performance is improved in the region of high velocity revolution, it would become possible to make the engine size smaller and lighter. The improvement of its power performance means the increase of delivery ratio.
    In this study, first of all, relations between the behavior of steel leaf valve and delivery ratio were investigated both experimentally as well as theoretically about the small size two-cycle engine.
    As the result, some countermeasures for power-up of the engine in the region of high velocity revolution were found here.
    Further more, it became clean that in the case that the plastics leaf valve is applied, nearly the same delivery ratio as the steel leaf valve could be obtained if the rigidity of the plastics leaf valve is not extremly lower.
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  • Studies on Cornering Characteristics of Four-wheel Steering Vehicles (2)
    Energy Consumption with Stationary Turn
    Kunio SATO, Isao TAJIRI, Hiromi TAKAGI
    1988 Volume 50 Issue 4 Pages 25-33
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_25
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    Stationary turning experiment at large steering angle, up to 80 degrees has been carried out with the electric four-wheel drive and steering vehicle manufactured for the previous study. In addition, by solving a static simulation model by graphical analysis to confirm the results of the experiment, investigation has been conducted on stationary turning characteristics of reverse steering in the steering angle ratio of the rear wheels to the front wheels 1:-1.
    As the results, it was confirmed that at a fixed steering angle, the cornering energy per unit running distance or unit cornering angle showed a sharp increase with increasing speed, and that the center of cornering moved forward in a circular arc and so forth.
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  • Break-up of Heavy Clay Soil Layers by Explosives (Part 2)
    Blasting of Soil Layers with Low Moisture
    Ken ARAYA, Satoshi TSUNEMATSU, Tsukasa MAEKAWA, Masayuki KITAYAMA, Koh ...
    1988 Volume 50 Issue 4 Pages 35-40
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_35
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    This research reports a method where sewage sludge and explosives were used to improve the physical properties of heavy clay soils. The soil must be tilled to a depth of 1m to lower the water table and to accelerate oxidation. Explosives are placed by a machine which produces a deep ditch by injecting pressurized sewage sludge, and the soil layer was loosened by detonating the explosives.
    The results showed that the blasting of a soil with high moisture content produced a cavity in the soil layer. At a low soil moisture the cavity was small and a suitable soil profile was obtained up to the soil surface. The quantity of explosive required to disrupt the heavy clay soil was empirically obtained as Lp=0.437W3[kg] (W=Explosive charge depth, m).
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  • The Distribution Function of Number of Seed and Seedling on Rice Seedling Mat
    Satoshi MURATA, Takashi NAKAJI
    1988 Volume 50 Issue 4 Pages 41-46
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_41
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    The distribution of the number of rough rice grains in unit section on the seedling mat differs much from the Poisson Distribution which assumes the grains to be points without volume. In this paper the finite number of seats for graint in the section was introduced to give the volume effect of the grains and the distribution was superposed in case of excess seeding ratio (λlim>3). The calculated distribution with the seat number eight to 1cm2 section agreed well with the observed distribution in the seeding ratio range between 2.494 and 5.509grains/cm2 for seed and seedling.
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  • Studies on Development of Wide Swath Fertilizer Spreader (Part II)
    Performance of Wide Swath Fertilizer Spreader with the vertical turning blades
    Junichi SATO
    1988 Volume 50 Issue 4 Pages 47-56
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_47
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    A wide swath fertilizer spreader which throws and spreads granular fertilizer in a long distance by large size turning blades was developed. Spreading performance of this implement was investigated on a field, and was discussed with the particle motion analysis.
    A wide swath fertilizer spreader was attached to a three points hitch of a tractor and threw granular fertilizer in the right angle direction of the tractor movement. The blades with the turning radius of 420mm rotated at 1400rpm on a horizontal axis parallel to a PTO axis of the tractor.
    The chemical granular fertilizeds used for spreading experiments were 3.51mm and 8.21mm in mean particle diameter.
    The average throwing distance obtained by the experiments was 60m for larger particles. The almost all fertilizer distribution pattern on the field had the shape of the hill side curve with a peak point put aside toward the spreader.
    The theoretical analyses and numerical calculations of the particle motion explained that the theoretical discharge points dispersed wide range on the circumference of the turning blades because of the width of inlet opening and the complicated particle motions due to both rolling and sliding on the blade.
    The dispersing of discharge points caused to break fertilizer particles.
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  • Thin Layer Drying Characteristics of Rough Rice (II)
    Takaharu KAMEOKA
    1988 Volume 50 Issue 4 Pages 57-65
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_57
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    Using the thin layer drying results in the first report, drying constant in a semitheoretical lump model was discussed. As the result, it was found that, even in the same drying curve, a different drying constant was obtained if a different drying period was chosen for the determination of drying constant. Based on the same model, a pair of equations were derived from the heat and mass balances in order to quantitatively define the depth of the thin layer by use of a set of parameters which indicated the degree of deviation from an ideal thin layer. The maximum value of the parameter which gave the maximum thin layer depth was determined. The suitable thickness of a thin layer in drying experiments can be established by using a pair of parametrrc coefficients.
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  • Studies on the Trommel Type Separator of Brown Rice (III)
    On the Cross-sectional Shape of the Cylinder and the Configuration of the Screening Sheet
    Akira AKASE, Masanori TSUCHIYA
    1988 Volume 50 Issue 4 Pages 67-76
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_67
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    The authors investigated the effects of the cross-sectional shape of the cylinder (circular and octagonal) and the configuration of the screening sheet (flat and undulatory) of the trommel type separator of brown rice on its separating performance.
    The main results were as follows:
    (1) The passage rate factor is higher in the octagonal shape than in the circular one and in the undulatory screening sheet than in the flat one.
    (2) The screening accuracy is higher in the circular and octagonal cylinders with the undulatory sheet than others.
    (3) The undulatory screen has the action which aligns the long axis of grain particle to the direction of the slit of the screen.
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  • Studies on Flash Drying for Husking High Moisture Rough Rice
    Eiji BEKKI
    1988 Volume 50 Issue 4 Pages 77-85
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_77
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    This study evaluates the improvement of the husked ratio by flash drying the husk when using a roll-type husker to process high moisture rough rice. To attain the same husked ratio as the dried rough rice without producing a fissured grain or cracked fragments, the rough rice samples with the moisture content of 18, 20, 22, 24 and 26 per cent level were passed for four, six, six, eight and ten times respectively (one grain was heated for about one second per pass) through the heated air flow at 310°C. The rough rice with 26 per cent moisture was almost entirely lost in germinative ability at the fourth pass, and the whiteness of the brown rice was less than the standard value by one to two per cent. Since a laboratory apparatus for flash drying had low efficiency in using the heat supplied, it is necessary to raise adiabatic ability on the outside wall of a drying column and also to increase the reuse rate of discharging heat for reducing heating energy requirements.
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  • Expert Systems in Troubleshooting Grain Combine (Part 1)
    Mitsuhiro NAKAMURA, Takaharu KAMEOKA, Tetsuya INADA
    1988 Volume 50 Issue 4 Pages 87-93
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_87
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    With the rapid progress and recent increase in the complexity of agricultural machinery, their faults have become complicated and their quick and right diagnosis needs the knowledge of high quality of their structures and functions. In this paper, prototype expert systems in troubleshooting grain combines were built as an application of artificial intelligence to tough agricultural tasks. Part 1 deals with the systems developed by using the expert shell “Sogen”. As a result, it was found that the knowledge of experts could be stored in the knowledge base of a computer by means of knowledge engineering technique. It was also confirmed that the building prototype expert systems was meaningful to evaluate a possibility of complete systems.
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  • [title in Japanese]
    [in Japanese]
    1988 Volume 50 Issue 4 Pages 96-97
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_96
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  • [title in Japanese]
    [in Japanese]
    1988 Volume 50 Issue 4 Pages 97-101
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_97
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    1988 Volume 50 Issue 4 Pages 102-107
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_102
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    1988 Volume 50 Issue 4 Pages 107-111
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_107
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1988 Volume 50 Issue 4 Pages 111-115
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_111
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    1988 Volume 50 Issue 4 Pages 115-119
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_115
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    1988 Volume 50 Issue 4 Pages 119-123
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_119
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    1988 Volume 50 Issue 4 Pages 123-127
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_123
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    1988 Volume 50 Issue 4 Pages 127-129
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_127
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1988 Volume 50 Issue 4 Pages 130-132
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_130
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1988 Volume 50 Issue 4 Pages 132-135
    Published: 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.50.4_132
    JOURNAL FREE ACCESS
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