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 52, Issue 3
Displaying 1-16 of 16 articles from this issue
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  • [title in Japanese]
    1990 Volume 52 Issue 3 Pages 1
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_1
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1990 Volume 52 Issue 3 Pages 2
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_2
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1990 Volume 52 Issue 3 Pages 3-4
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_3
    JOURNAL FREE ACCESS
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  • Fundamental Behavior of Engine Speed to Load Fluctuation in Agricultural Engines
    Yuzuru KUBOTA, Shigenobu HAYASHI, Norihiro SAWA
    1990 Volume 52 Issue 3 Pages 5-12
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_5
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    Four-Cycle Gasoline Engines are widely used in vehicles and machines for construction, agriculture and others.
    Such engines are always operated under either step functioning or periodically changing load conditions.
    In this paper, the authors made experimentally clear the response of engine speed to rapidly increasing, decreasing or sinusoidally fluctuating load. An analysis was carried out using a simplified model in which time lag of first order of engine systems was taken into account.
    The results obtained coincide well with the experimental results, and hence it could be confirmed that it is possible to simulate the speed response to variation of the load.
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  • Hand-Transmitted Vibration Reduction of Agricultural Machinery (Part 1)
    Simulation Method for Vibration Reduction
    Masamichi DAIKOKU, Fumitake ISHIKAWA
    1990 Volume 52 Issue 3 Pages 13-19
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_13
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    For the purpose of efficiently reducing hand-transmitted vibration of walking type or portable type agricultural machinery, it is necessary to calculate and predict vibration reduction due to improvement in the stage of design or trial manufacture. But this calculating method cannot be considered without dynamic characteristics of hand-arm system.
    In this paper, computer-simulation method, that consisted of a third degree of freedom (mass-spring-damper) model of hand-arm system, modal analysis and building block approach, was applied to the estimation of hand-transmitted vibration of walking type tractor. In addition, the calculated values were compared with the measured values of vibration reduction achieved by inserting vibration-insulating rubber. As these experimental results indicated that the calculated values showed the same vibration levels and frequency characteristics as measured, it was concluded that this method could be useful to reduce hand-transmitted vibration.
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  • Basic Studies on the Power Driven Disk Plow (Part II)
    Gang Angle, Disk Space and Sectional Area of Furrow Slice
    Jun SAKAI, Soon Goo KWON, Eiji INOUE
    1990 Volume 52 Issue 3 Pages 21-28
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_21
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    The purpose of this study is to analyze the basic characteristics of power driven disk plows, and to obtain some basic instructions of the design theories for a power driven disk plow. The analyses for motion and angle factors of an arbitray point on the disk plow were reported in the previous report (Part I).
    This report (Part II) clarifies the relationships between disk-plow radius, the curvature radius of disk plows, tillage depth and gang angle, which are important design factors of the disk plow. Basing on the above results, some equations to calculate the height of tillage residual after tillage, disk space and tillage width are obtained through motion analysis.
    Moreover, the theoretical equation to express the sectional area of a furrow slice is proposed. This equation is useful to qualitatively estimate overturning of furrow slices and the specific resistance of plowing.
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  • Vibration of Tractor Body Equipped with a 4-Shank Vibrating Subsoiler
    Kenshi SAKAI, Shun-ichi HATA, Satoru NAMBU
    1990 Volume 52 Issue 3 Pages 29-35
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_29
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    The reduction of draft force is the most important advantage of vibrating subsoilers. It is recognized, however, that the tractor body vibrates violently and the power requirement for a vibrating subsoiler is large. For this study a prototype 4-shank subsoiler was designed and manufactured for use on medium sized tractors (35-50kW) to break compacted soil was developed. The operating width of this subsoiler is 2.0m and the operating depth can be set between 0.4 and 0.55m.
    The phase lags between each of the shanks were evenly distributed and the tractor body vibration was reduced. The optimal order of motion for the four shanks was investigated.
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  • Break-up of Heavy Clay Soil Layers by Explosives (Part 3)
    Beak-up by Linear Blasting
    Ken ARAYA, Tsukasa MAEKAWA, Satoshi TUNEMATU, Rui GAO, He Ping ZHAO
    1990 Volume 52 Issue 3 Pages 37-42
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_37
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    Research was conducted to investigate a method in which sewage sludge and explosives were used to improve the physical properties of heavy clay soils. In previous publications, we conducted fundamental blasting tests with one point blasting. This report deals with the two points simultaneous blasting and two linear simultaneous blasting the procedures of which would be nearly same to those used in actual breaking works.
    The blasted area of a heavy clay soil layer by the two points simultaneous blasting was 1.4m and that by two linear simultaneous blasting was spreaded to 2.1m.
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  • Cost Analysis on Paddy Farm Operation by Computer Simulation
    Noriaki ISHIZUKA
    1990 Volume 52 Issue 3 Pages 43-52
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_43
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    The higher usage of farm land, expansion of farm scale, introduction of appropriate machines for farm scale and their effective utilization are demanded to improve the production effiency of paddy farming in Japan.
    In this paper, the production activities of a farmer group, which will become a main producer in a region, are simulated by a computer. Then the cost analysis is progressed for defining the effects of the factors, which are farm scale, mechanization level, cropping system, land rent, product price, charge for rice processing and workers' wage. As the results of the analysis, it was cleared that reduction of machines, improvement of cropping system and farm scale expansion by rented land are necessary to reduce the cost in paddy farming.
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  • Visual Feedback Control of Fruit Harvesting Robot (Part 1)
    by use of Processing of Combined Binary and Gray Images by Light Emittance
    Noriaki YUKAWA, Kiyoshi NAMIKAWA, Tateshi FUJIURA
    1990 Volume 52 Issue 3 Pages 53-59
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_53
    JOURNAL FREE ACCESS
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    The fruit harvesting robot was controlled by visual feedback to raise its operation precision and efficiency. The visual device which consists of a CCD color video camera, two strobes and a supersonic wave distance sensor, was attached to the end-effector of the robot manipulator. And new image processing method processing of combined binary and gray images by light emittance was applied with this device.
    Image processing system was developed. This system consists of a personal computer, the visual device, an image processor, the control circuit of the visual device and a software. The indoor experiments of visual feedback control were successfully conducted with this system. The results obtained suggested that the control method and the image processing method were effective.
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  • Erratum to : Clod Coneiguration Forming Process in Rotary Tilling (2)
    1990 Volume 52 Issue 3 Pages 60
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_60
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  • Measurement of Drying Characterisitics of Buckwheat
    Satoshi MURATA, Toshio KAWANO, Shouji KOIDE, Akio TAGAWA
    1990 Volume 52 Issue 3 Pages 61-67
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_61
    JOURNAL FREE ACCESS
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    The fundamental physical properties of buckwheat required to design drying equipment were measured and analyzed as follows:
    (1) The equilibrium moisture content for desorption process, the hysteresis and the heat of moisture vaporization were measured, and the parameters of the empirical formulae were determined.
    (2) The densities and the coefficient of the thermal and hygroscopic expansion were measured, and the parameters of the empirical formulae were determined.
    (3) An attempt of drying simulation was made by considering the local moisture dependence on the diffusion coefficient.
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  • The Drying and Hygroscopic Characteristics of Orchardgrass Hay in Field Curing
    Regression analysis of drying and hygroscopicity in an initial day under fine weather condition
    Katumi KAWAKAMI, Michio KOMIYA
    1990 Volume 52 Issue 3 Pages 69-74
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_69
    JOURNAL FREE ACCESS
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    Studies on the field curing characteristics of orchardgrass hay were conducted for planning of hay making. The field curing process of hay in the day of mowing was divided into two phases of a drying process in the daytime and a hygroscopic process from the evening to the next morning.
    The drying process in the daytime (9:00-15:00) and the hygroscopic process from night (21:00) to next early morning (3:00) were both able to be approximated with exponential equations.
    The parameters of the empirical model of the drying rate was influenced by the average of the atmospheric temperature or relative humidity in the daytime, while that of the hygroscopic rate was influenced by the meteoric relative humidity of the evening and the moisture content of hay.
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  • Energy Recycling in the Bread Baking Process (I)
    Ikuo MATSUDA, Hiroshi MORISHIMA, Yasuhisa SEO, Yasuyuki SAGARA
    1990 Volume 52 Issue 3 Pages 75-82
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_75
    JOURNAL FREE ACCESS
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    Mass and heat balance were measured to examine the reuse of 130-180°C exhaust gas from an oven in a baking industry. From the data, energy was calculated to make clear the quality of exhausted energy. By using this exhausted energy for an absorption refrigeration system, an energy recycling system was suggested and the refrigeration capacity was calculated. The refrigeration capacity was thus estimated to be enough for the bread cooler of the factory.
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  • Study on the Mixing and Storage Drying Method of Grain (part 1)
    Positive Experiment by Test Machine
    Zuan JIN, Ritsuya YAMASHITA, Kiyokazu GOTO
    1990 Volume 52 Issue 3 Pages 83-87
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_83
    JOURNAL FREE ACCESS
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  • Roots Distribution of Corn and Tuber Shape Related to Qaulity in Yam
    An Approach in Phytotechnology
    Sakae SHIBUSAWA, Hajime ARAKI
    1990 Volume 52 Issue 3 Pages 89-93
    Published: 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.52.3_89
    JOURNAL FREE ACCESS
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