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 51, Issue 1
Displaying 1-20 of 20 articles from this issue
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  • The future Field of Agricultural Machinery
    Ritsuya YAMASHITA
    1989 Volume 51 Issue 1 Pages 1-2
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.1
    JOURNAL FREE ACCESS
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  • Sugar Cane Production and Its Mechnization
    H. IZUMI
    1989 Volume 51 Issue 1 Pages 3-4
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.3
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  • Stirling Cycle Engine for Combustion Heat Biomass
    Tsuguo OKAMOTO, Osamu KITANI, Tae Han KIM
    1989 Volume 51 Issue 1 Pages 5-12
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.5
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    A Stirling engine which has a number of merits such as a wide choice of various fuels, clean exhaust, small noise, low vibration, etc. has been studied. The aim of this study is the development of farm usable Stirling engines which are simple and free from maintenance.
    The trial-made Stirling engine driven by combustion heat of biomass was a single acting displaces type and had a power piston and a displacer piston as two separate cyliner systems connected by a crank mechanism. The heat generated by a gasifier combustor which could burn woody biomass pellet fuel of bark strip chips was used to operate the engine. The engine was tested and its perforomance was investigated for factors influencing output power.
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  • Studies on Optimal Control of Farm Power-Transmission-Equipment Systems (Part 1)
    Basic Practical Engine Performance
    Jun SAKAI, Cheng ZOU, Kei NAKAJI
    1989 Volume 51 Issue 1 Pages 13-20
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.13
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    In order to design a rational farm machine, a power source, a transmission system with shifting mechanism and a working equipment must be rational each other to be considered as an entire system.
    In this paper, the optimization of operating farm machinery in farm works and automatic control are analyzed so as to realize rational working under minimized energy input. Firstly, the basic performance test for several kind of farm engines were carried out in order to develop the control system for a power-transmission-equipment system applying computer science and mechatronic technology. Then, the characteristics of engine power, torque and specific fuel consumption were discussed. According to the results, large differences of specific fuel consumption up to several tens percent were observed even if the engines were driven in the same modes. The system design of the optimal control for a power-transmission-equipment system, and our fabrication of an experiment system will be reported in next paper.
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  • Studies on Automatic Steering System of Farm Tractor (Part 1)
    Automatic Steering Tractor by Using Computer-Eye
    Yoshiaki MISAO
    1989 Volume 51 Issue 1 Pages 21-28
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.21
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    In view of the development of an automatic steering tractor, a low-cost image processing unit consisted of a computer-eye, a microcomputer, a radio control unit and a crawler tractor with hydraulic devices were utilized experimentally.
    The microcomputer and the computer-eye system in this study were not mounted on the crawler tractor, but were connected separately with the controlled units.
    A video-camera took a picture of whole tractor. The computer-eye as a visual sensor can divide the picture into 256×256 pixel in vertical and horizontal directions, respctively, and memorize in the four-level brightness signals.
    The microcomputer is able to compare the four-level brightness signals instantly and find tractor position on the video-camera screen. If a tractor is apart from the target position, the microcomputer takes necessary measures to be controlled for a tractor in order to compensate the deviation.
    Field tests were tried to verify the developed program, and succeeded to observe the satisfactory controllability of automatic steering system. The hardware and software of automatic steering system and the method of tractor detection were described in this report.
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  • Study on the Mathematical Model of Japanese Rotary Blades for Computer Aided Design (CAD)
    (Part 1) Blade-tip and edged curve portions
    Hai(Van Hai) SAKURAI(Lam), Jun SAKAI
    1989 Volume 51 Issue 1 Pages 29-35
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.29
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    Many methods are available for the design of Japanese rotary baldes (Nataba). Employing mathematical model for CAD (Computer Aided Design) on both the results of authers' research and the other obtained in past 20 years, the 29 parameters are selected in order to design the Japanese rotary blade. The main design parameters can be distinguished as the form of holder, neck portion, edged curve and also durability, outward appearance and heat treatment.
    These design parameters are then substituted into the theoretical equations following the human logical process. The developed flow-chart can be adapted as a general language and the program for drawing the rotary blade by the use of X-Y plotter with a micro-computer is developed too.
    In this paper, the mathematical models of a blade-tip and an edged curve portions are presented under the manufacturing method and tillage conditions of Japanese rotary blades.
    The other parts and the completed drawing of bladess will be reported in next papers.
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  • A Travelling Performance of Rigid Lugged Wheels
    Part 2: Slip-line Fields for Analysis of Soil Reactions Acting on a Lug Surface
    Koichi HASHIGUCHI, Masahiro KAMEI, Yuichiro IDE, Jun SAKAI, Takeshi IM ...
    1989 Volume 51 Issue 1 Pages 37-43
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.37
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    This study aims to establish a reasonable designing method of lugged wheels running on soft grounds such as a farm. Some theoretical analyses of soil reactions acting on a lug surface by introducing the slip-line method have been reported in the past. They did not, however, account for a movement of lug and a deformation of soils, adopting merely Rankine's slip-line field of a passive earth pressure for the case that a lug surface is nearly vertical.
    Kinematically admissible slip-line fields (Table 1, Fig. 3) are proposed in this paper, classifying them according to a failure condition of soils, a friction condition of soil-lug interface, a state and a movement of lug surface. Then, a state of failure stress in slip-line fields are elusidated by analyzing angles of expansion of logarithmic spiral fields.
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  • Studies on Tilling Methods for Clayey Soils (II)
    Inprovments on the Rate of Soil Pulverization in Paddy Fields and Rotational Fields
    Yutaka KANETANI, Isamu KURATA
    1989 Volume 51 Issue 1 Pages 45-53
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.45
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    In order to improve the rate of soil pulverization in paddy fields and rotational fields, these studies were carried out. In the case of paddy fields, the rate of soil pulverization of 70% was obtained in tillage by straight blade type rotary, and its value showed an increase of 10% compared with the tillage by curved blade (Japanese curved blade) type rotary. Moreover the tilling power requirements of straight blade type rotary showed a decrease of 10% compared with curved blade type rotary. In the case of rotational fields and first year of rotation, the rate of soil pulverization of 60-85% were obtained in tillage by up-cut rotary, and its value showed an increase of 10-15% compared with the tillage by usual rotary. Buried percentage of clum and hill of barley by up-cut rotary were at higher values than its values by usual rotary. However, in the case of 3rd year of rotation, the rate of soil pulverization showed low values. The tilling power requirements showed an increase of 10% compared with usual rotary.
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  • Studies on Intellectualization of Agricultural Machinery (On the Artificial Tactile Sense)
    Part 4 Non-physical and Parametric Representation of Dynamic Characteristics of Farm Products and Its Application to Quality Judgement
    Yoshio IKEDA
    1989 Volume 51 Issue 1 Pages 55-61
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.55
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    The instrument and control system for measurering the quality of the farm products non-destructively and in real time was developed and the frequency response functions of the farm products were estimated through random excitation. The frequency response function was represented parametrically. Since this parametric model was the non-physical and multi-variable one, then the Mahalanobis generalized distance was introduced as the measure for describing the quality change during storage. And the new technique for the quantitative judgement of the farm products was proposed.
    The experiments were conducted with the Japanese pears of NIJISSEIKI. The results obtained suggested that the quality changes during thirty or more days' storage were almost detectable.
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  • Basic Studies on Composting of Animal Wastes (3)
    Classification of Weight Loss into Dry Matter Loss and Moisture Loss by Analyzing Exhaust Air
    Toshinori KIMURA, Hiroshi SHIMIZU
    1989 Volume 51 Issue 1 Pages 63-70
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.63
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    Improvement of the compact sized fermenter which had been developed in our previous study was done to make it possible the concurrent measurement of weight loss and ventilated air composition.
    The classification of weight loss into dry matter loss and moisture loss which were calculated from the measured data indicated satisfactory reference to actual phenomena in the composting.
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  • Fundamental Study on the Temperature Estimation of Stored Bulk Rough Rice
    Sei-ichi OSHITA, Yoshito OKA, Kenji NAKAGAWA
    1989 Volume 51 Issue 1 Pages 71-78
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.71
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    Temperature response within bulk rough rice in a cylindrical storage bin was examined experimentally and was numerically analyzed by means of the finite element method. The results showed that numerical values have acceptable accuracy in estimating temperatures. It was indicated that the axial heat flow is much affected by the heat which transfers through the air on the top of the storage bin.
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  • Ejector Type Gas-Nozzle Producing Fine Air Bubbles (1)
    Jinzo NAGAHIRO, Junjiro IWAMOTO, Ken HIGUCHI
    1989 Volume 51 Issue 1 Pages 79-87
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.79
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    Fine air bubbles are useful for the improvement of a food sense and also making the amount of dissolved oxygen in the water rapidly. This study, in view of these qualities, was performed to develop the new techniques produced fine air bubbles into the liquids of various kinds. Many experiments were carried out in order to determine optimum suitable design standards for an ejector type gas-nozzle such as the principle dimensions of gas-nozzle and the associated velocity of liquid jet etc. As a result, it was certified that a cloud of fine air bubbles of diameter 10-200μm could be stably and continuously produced at fairly high efficiency into the liquids such as water, salad oil, a solution of egg and melted chocolate by the use of the ejector type gas-nozzle built as a trial.
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  • Studies on the Vertical Rotating Screen Separator of Brown Rice (I)
    On the Screening Performance and its Affecting Factors
    Akira AKASE, Masanori TSUCHIYA
    1989 Volume 51 Issue 1 Pages 89-96
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.89
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    The vertical rotating screen separator for removing small particles from brown rice was recently developed. This separator has a cylindrical screen and a rotor with the helical blade. The material rises from the bottom to the top of the separator. The authors investigated the effects of rotating direction and speed of the screen, rotating speed of the helix rotor and feed rate of the material on screening performance of the separator. The main results are as follows:
    (1) When the screen rotates oppositely to the helix rotor, the screening efficiency is high.
    (2) The rate of decrease of screening efficiency with increase of the feed rate of material is small.
    (3) The screening efficiency of the vertical separator which has the screen of about half length of the horizontal separator with a little inclination is almost the same as that of the latter.
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  • Separating Characterisitics of a Shaking Separator (II)
    Flow Velocity of Grain on the Shaking Table
    Hatsuo KOJIMA, Ritsuya YAMASHITA
    1989 Volume 51 Issue 1 Pages 97-102
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.97
    JOURNAL FREE ACCESS
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  • Tests of the performance and the analysis on a paddy container
    Satoshi MURATA, Akio TAGAWA, Sadato ISHIBASHI, Shingo MIYAMOTO
    1989 Volume 51 Issue 1 Pages 103-108
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.103
    JOURNAL FREE ACCESS
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  • Agriculture and Mechanization in Southeast Asia (1)
    Recent Situations in Thailand
    Makoto HOKI, Masayuki KOIKE
    1989 Volume 51 Issue 1 Pages 109-114
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.109
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  • [title in Japanese]
    [in Japanese]
    1989 Volume 51 Issue 1 Pages 115-119
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.115
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  • [title in Japanese]
    [in Japanese]
    1989 Volume 51 Issue 1 Pages 121-125
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.121
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1989 Volume 51 Issue 1 Pages 127-131
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.127
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1989 Volume 51 Issue 1 Pages 132-135,137
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.132
    JOURNAL FREE ACCESS
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