JOURNAL of the JAPANESE SOCIETY of AGRICULTURAL MACHINERY
Online ISSN : 1884-6025
Print ISSN : 0285-2543
ISSN-L : 0285-2543
Volume 46, Issue 3
Displaying 1-20 of 20 articles from this issue
  • Osam KITANI
    1984 Volume 46 Issue 3 Pages 295-296
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • Development of Automatic Operating System and Partial Cooling System
    Isamu KURATA
    1984 Volume 46 Issue 3 Pages 297-302
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Among the machine suited with the movable type crop-bed system, the facilities for pest control, and irrigation can be full-automatically controlled. The pest control facilities were synchronized with the continuous movement of the growing boxes, and the irrigation facilities were moved with the intermittent movement of the growing boxes. The partial cooling apparatus composed of the heat source unit, absorption type refrigerator and the heat exchanger, and the greenhouse can be divided into two parts by the curtain, a working area and a growing area. It is possible therefore to control the air condition suited with the working environment by use of this apparatus.
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  • Screw Type Separating Mechanism and Determinations of its Specification
    Tomohiko ICHIKAWA, Takao SUGIYAMA, Masao MANAKA
    1984 Volume 46 Issue 3 Pages 303-308
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    As the simple mechanism for separating the mixture of grains, stalks and emptied pods which pass through the concave of the screw type threshing mechanism, the screw type separating mechanism composed of a screw auger with agitators and a concave was developed. In this separating mechanism, grains drop down through the concave together with small stalks and emptied pods, while large stalks and pods are carried along the direction of axis and disposed through the stalk outlet. And the proper specification of main structures on this mechanism such as pitch, number of agitating plate, clearance, rotating speed of the screw auger and meshes of the concave were clarified by basic experiments.
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  • Husking Properties by Pseudo-static Frictional Force
    Shigeru YOSHIZAKI, Sumihiko MIYAHARA
    1984 Volume 46 Issue 3 Pages 309-315
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    In order to find the husking properties of paddy grains it was evaluated from the husking strength under pseudo-static frictional force. Husking strength, defined as the critical shearing stress, was calculated as the maximum frictional force divided by the contact area between a paddy and a rubber plate. The maximum frictional force was measured by a direct shear tester, while the contact area between a paddy and a rubber plate was obtained according to Hertz's elastic theory. The husking strength was shown as a normal distribution curve, which was influenced by the grain variety, husking position and grain shape.
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  • Analysis of rice plant lodging by use of boundary element method
    Haruhiko MURASE, Yoshiaki NAKAMURA, Noboru KAWAMURA
    1984 Volume 46 Issue 3 Pages 317-324
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Seeding depth is one of the key factors affecting rice plant growth in the current practice of the direct seeding of coated rice in the submerged paddy field. Objectives of this study are to determine optimum seeding depth of rice by theoretical analyses and to obtain information necessary for designing the seeding depth control system for the rice Seeder used in the submerged paddy field. The relationships between rice plant toppling and the mechanical behavior of the soil-plant composite system will be discussed in Part I. The boundary element method was used to model the rice plant toppling phenomena. It was concluded that a rice plant with a below ground culm length less than 0.5cm is potentially subjected to the lodging of toppling type. A theoretical analysis of the apparent buoyant phenomena of sown rice seed will be presented in Part II. These studies will provide a theoretical standard of optimum seeding depth. A seeding depth control system simulation and a related system design will be reported in the following installments.
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  • Manufacturing of Blades and Simulations of Backward Throwing of Soil Clods
    Sakae SHIBUSAWA, Noboru KAWAMURA
    1984 Volume 46 Issue 3 Pages 325-331
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    The munufacturing of rotary blades which can give the various scoop surface, using the design method discussed in previous paper and simulation results of their throwing characteristics of the clods are described. The throwing characteristics were simulated as follows:
    (1) In case of up-cut tilling, the scoop surface with smaller ρ, larger φ and larger φ1 gives longer throwing distance.
    (2) Up cut tilling under greater tilling depth condition than blade radius and down cut tilling under the smaller depth than the radius can be recommended for backward throwing. Then higher revolutional speed of blade can throw longer distance under those tilling conditions.
    (3) ρ should be smaller than blade radius in order that the clods are accelerated in sliding along the scoop surface, otherwise the clods are accelerated only by the tip and then they apart from the surface.
    (4) The clods should be given higher initial velocity not to re-cut in throwing by the blade.
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  • Elasto-plastic Analysis and Dynamic Behaviour of Frame
    Fumitake ISKHIKAWA, Kyoshiro MIURA
    1984 Volume 46 Issue 3 Pages 332-338
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Two basic problems, elasto-plastic analysis and impact behaviour, are discussed to propose the design criteria of tracfor safety frame. The elasto-plastic analyses were made by use of the results of static-loading tests and finite element method. It became possible to predict the collapsing process of frame by finite element method in case of some mechanical property of materials are known accurately.
    The dynamic behaviour of safety frame was also solved clearly. Namely, the dynamic yield stress of material (mild steel) under impact load was 30-40% higher compared with the static yield stress.
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  • Comparison between the experimental and the calculated results
    Masasuke ICHIKAWA, Mitsushi YAMASHITA
    1984 Volume 46 Issue 3 Pages 339-346
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    In the previous report the pitching motion equation off walking type rice transplanter was derived the theoretical solutions were obtained. This paper reports the concrete solution based on the results (mass, moment of inatia, spring constant, coefficient of damping viscosity etc.), Which are for obtaining the particular solution of motion equation. With respect to the comparison between the four-degree-of-freedom and two-degree-of-freedom on the dynamic model of ride transplanter, the results of former system were almost the same as the experimental data.
    To validate the theoretical analysis, the transplanter was mounted on the main frame which can more expressing an irregular surface of the field for it to travel.
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  • Shun'ichiro TANAKA, Sadato ISHIBASHI, Akira TANAKA
    1984 Volume 46 Issue 3 Pages 347-352
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    The finite element method was used to estimate the temperature history and mass-average temperature of an apple and a persimmon, which was respectively cosidered as axisymmetric body, at transient cooling.
    Primarily, the governing equation was formulated by using the simplex triangular element, and the computer program was developed to calculate the mass-average temperature. Secondary, the appropriate element size and time interval was determined by some numerical experiments.
    From these results and hydra-cooling experiment of the products, it was found that the cooling process of an apple and a persimmon were respectively different from a spherical shape, and the mass-average temperature for them was 0.78R and 0.77R respectively.
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  • Microcomputer-controlled Manipulator System for Fruit Harvesting
    Noboru KAWAMURA, Kiyoshi NAMIKAWA, Tateshi FUJIURA, Motonobu URA
    1984 Volume 46 Issue 3 Pages 353-358
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    An agricultural intelligent robot was constructed experimentally for harvesting tomatoes and other fruits. It was small, low cost and less electric power type robot. The articulated manipulator was anthropomorphic type with 5 degrees of freedom and each link was driven by a DC motor. The motion of manipulator was numerically controlled to harvest tomato fruits with a comparatively high speed. A television camera equipped with a MOS image sensor was adopted as an eye of the robot. Red color and brightness signals were compared by a compactor and this binary output signal was fed to the pattern memory. The three dimensional position of each fruit was calculated by giving two input patterns at different positions. These TV camera and manipulator were mounted on a battery car and the intelligent robot was consisted. A continuous fruit harvesting test was tried in the field under the control of main program by which every software was connected. Both hardware and software of controlling the manipulator were described in this report.
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  • On the Trenching Characteristics
    Masanori TSUCHIYA, Jun'ichi KAMJDE, Akira AKASE
    1984 Volume 46 Issue 3 Pages 359-364
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    In recent years, small trenchers are popularly used as farm machinery for root harvest, deep tillage, trenching of drainage canal and so on, in Japan. In this paper, a small self-propelled trencher with a engine of 3.7kw mounted and a chain ladder type cutting device were investigated to clarify the characteristics in trenching work. The trenching power and the pulling force (driving force) were measured under the several conditions varying trenching width, depth, velocity and number of blades. It was concluded from the results that the trenching power and the pulling force were increased with the increase of width, depth and velocity, but were not influenced by number of blades attached on the chain. The trenching energy per unit volume of soil was almost constant in the range of 0.4 to 0.5J/cm3.
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  • Toshio IWAO, Norihiro ITO, Seiji NAKAO
    1984 Volume 46 Issue 3 Pages 365-367
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • Masasuke ICHIKAWA, Mitsushi YAMASHITA, Tomohiko SAITOH
    1984 Volume 46 Issue 3 Pages 368-373
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • Nobuhito MURAI, Tetsuo TAMAKI, Yoshiaki TAKAHASHI, Tetsuhiro NOBUTA, M ...
    1984 Volume 46 Issue 3 Pages 374-380
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • Katsuhiko TAMAKI, Sumiyuki FUJIOKA, Kunihiko MAEOKA, Sakae KODERA
    1984 Volume 46 Issue 3 Pages 381-383
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • Setsuo HAYASHI, Akira UCHIYAMA
    1984 Volume 46 Issue 3 Pages 384-387
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • Akira ISHIHARA
    1984 Volume 46 Issue 3 Pages 389-393
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • Shigeo UMEDA
    1984 Volume 46 Issue 3 Pages 394-396
    Published: 1984
    Released on J-STAGE: April 30, 2010
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  • Ryuzo TAKEUCHI
    1984 Volume 46 Issue 3 Pages 397-404
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • Masayuki KASAHARA
    1984 Volume 46 Issue 3 Pages 405-408
    Published: 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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