JOURNAL of the JAPANESE SOCIETY of AGRICULTURAL MACHINERY
Online ISSN : 1884-6025
Print ISSN : 0285-2543
ISSN-L : 0285-2543
Search
Advanced search
OR
Browse
Search
Volume 51, Issue 2
Displaying 1-21 of 21 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • On Possibilities of Technical Cooperation on Post-harvest Processing by Agriculturall Engineers
    Yasumasa KOGA
    1989 Volume 51 Issue 2 Pages 1-7
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_1
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    [in Japanese]
    View full abstract
    Download PDF (3096K)
  • Studies on Optimal Control of Farm Power-Transmission-Equipment Systems (Part 2)
    Development of the optimal control experimental system
    Cheng ZOU, Jun SAKAI, Kei NAKAJI
    1989 Volume 51 Issue 2 Pages 9-16
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_9
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    This paper deals with: 1) the optimal control concept of a farm power-transmission-equipment system, 2) the optimal control system design, 3) the experimental system for proving the possibility of the control System, and 4) the testing results.
    The hardware of this experimental system consists of four subsystems such as an engine-transmission-load subsystem, a measuring subsystem, a controller unit subsystem and a computer subsystem. The softwares for the data acquisition, optimal calculations and optimal controlling are also developed.
    The results of the optimal control testing show that the engine is always able to work in the optimal region of the lowest specific fuel consumption by controlling the engine speed and the shifting ratio of the transmission system, through the application of this control system on a farm power-transmission-equipment system.
    View full abstract
    Download PDF (1289K)
  • A Travelling Performance of Rigid Lugged Wheels (Part 3)
    Analysis of Soil Reactions Acting on a Lug Surface and its Comparison with Experiment
    Masahiro KAMEI, Koichi HASHIGUCHI, Yuichiro IDE, Jun SAKAI
    1989 Volume 51 Issue 2 Pages 17-22
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_17
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Based on the slip-line fields proposed in the part 2, a soil reaction acting on a lug surface is elucidated in this part of study by analyzing areas of soil-lug interface. Besides, a soil bin test was performed to obtain an experimental evidence for soil reaction on a lug, in which especially a lug angle and a slippage were changed in several stages. A good approximation of theory to experiment for waves of a horizontal (net thrust) and a vertical (dynamic contact) forces was obtained qualitatively as shown in Fig. 5 to 7, while a more precise analysis is desirable for a quantitative prediction.
    View full abstract
    Download PDF (2484K)
  • A Normal Stress Distribution under a Rigid Wheel
    Analysis in consideration of viscoelastic properties of soils
    Tatsuo HIROMA, Yutaka KAYAMORI, Keisuke SUYAMA
    1989 Volume 51 Issue 2 Pages 23-30
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_23
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A normal stress distribution under a rigid wheel travelling on soft ground such as a farm with a high moisture content was analyzed introducing a viscoelastic constitutive equation with three element Maxwell model. Based on Bekker's method, it was assumed that a normal stress under a wheel is equal to that under a rigid plate penetrated vertically to the sinkage of the ground contact face of the wheel.
    It is indicated from the calculated results that the maximum normal stress appears in front of the wheel axle and that the normal stress decreases with an increase of slippage which causes the increase of sinkage and contact area. These calculated results were compared with test results, in which we see their good agreement.
    View full abstract
    Download PDF (1073K)
  • Studies on Tilling Methods for Clayey Soils (III)
    Deeep Tillage in Paddy Fields and Rotational Fields
    Yutaka KANETANI, Isamu KURATA
    1989 Volume 51 Issue 2 Pages 31-38
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_31
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The studies on deep tillage by using power-driven disc plow and deeper rotary have been carried out for the purpose of establishment of deep tillage in paddy fields and rotational fields.
    In the case of paddy fields, the depth of 18cm were obtained by use of power-driven disc plow in wet field conditions of moisture contents of 64%. The tilling power requirements were 20-25kW and the drawbar resistance were 2100-3200N. It was recognized that the field performance of planting in deep tillage by disc plow were differ little compared with tillage by usual rotary.
    In the case of rotational fields, the limits of tilling depth by use of deeper rotary were 38cm. However the deep tillage of tilling depth of over than 38cm made a trouble that clayey soils were close-packed amid tilling blades. It was said that the deep tillage made a suitable soil profile of depth of plow layer of 30cm.
    View full abstract
    Download PDF (1222K)
  • Basic Studies on the Power Driven Disk Plow (Part I)
    Motion of an Arbitrary Point “P” and Angle Factors
    Jun SAKAI, Soon Goo KWON, Eiji INOUE
    1989 Volume 51 Issue 2 Pages 39-45
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_39
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    This research is carried out to analyze the basic characteristics of a “power driven disk plow” and to develop the design theory for reasonable disk plows, recently diffusing in Japan.
    In the “Part I”, in order to analyze the basic characteristics of an arbitrary point on the power driven disk plow, the three dimensional motion equations were proposed. The factors considered were the revolutional speed of the disk plow, the traveling speed of a tractor, the gang angle, the radius of the disk plow and so forth. Moreover, theoretical equations to express the motion and the angle factors of an arbitrary point were analyzed, and its characteristics were explained.
    View full abstract
    Download PDF (4059K)
  • Interactions in Soil-lug System (Part 3)
    Soil behavior under lug and sinkage variation of lugged wheel
    Hiroshi NAKASHIMA, Takashi TANAKA
    1989 Volume 51 Issue 2 Pages 47-55
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_47
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    As a serial study on soil-lug system interactions, soil behavior under a lug was firstly observed. Results show that the soil under a lug is strongly mobilized backward and the free soil surface between lugs deforms greatly in case of small lug angle with high wheel slippage, whereas in low wheel slippage, forward bulldozing phenomenon by the back of lug surface becomes clear especially with the lug of 30 degree lug angle. The shape of boundary nondeforming region in soil which moves with lug motion was approximately regarded as a part of ellipse.
    Secondly it is shown that the sinkage variation of lugged wheel can be expressed by a trigonometric function. It turned out that the direction of soil reaction vector at the acting point of maximum soil reaction tends to be decreased as lug angle increases in comparison with the direction of lug velocity vector at the same position.
    View full abstract
    Download PDF (3290K)
  • Research on Attitude Control of Tractors for Sloping Ground (Part 2)
    Characteristics of Parallel Links for Front Wheels and Ground Load
    Isao TAJIRI, Kunio SATO
    1989 Volume 51 Issue 2 Pages 57-65
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_57
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The suspension for the tractor manufactured for trial was constituted by using parallel link type for front wheels and trailing arm type for rear wheels, therefore, for the basic design, the characteristics of the parallel links and the ground load of the tractor manufactured for trial were examined.
    First, the equations for the equilibrium of forces acting on the links were derived, and the force acting on each link was determined. Then, by taking this equation of equilibrium and the ratio of side forces, the equation for determining the ground load when the tractor stands still in the direction of contour line was derived, and the equation was confirmed with a model test, at the same time, the mechanical characteristics were clarified.
    View full abstract
    Download PDF (3496K)
  • Utilization of Water Flow Energy
    R. Takeuchi, K. Tokida, Y. Ishii, T. Furuta, H. Itagaki
    1989 Volume 51 Issue 2 Pages 67-74
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_67
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Utilizing latent small hydraulic energy for agricultural production, a prototype water heating apparatus with fluid agitation method was fabricated from a torque converter and its performance was examined.
    In the fundamental experiment, the direction of revolution was changed when oil was used as an active fluid, and the gap between agitating blades and fixed blades was changed when water was used. It resulted in a different torque characteristics.
    Secondly, flowing water which had 6.05m of effective head and 1.25m3/min of discharge was given to a cross-flow turbine and converted to mechanical energy for water heating experiment.
    It generated 428W of mean friction shaft power, and most increased water temperature was 25.0°C whereby the heated water discharge was 0.12l/min and the energy conversion efficiency was 67%.
    View full abstract
    Download PDF (1170K)
  • Ejector Type Gas-Nozzle Producing Fine Air Bubbles (II)
    Jinzo NAGAHIRO, Junjiro IWAMOTO, Ken HIGUCHI
    1989 Volume 51 Issue 2 Pages 75-83
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_75
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Many experiments, following the report (1), were carried out to investigate the effect of various factors on the performance of bubble production of an ejector type gas-nozzle built as a trial. As a result, (1) the optimum design standards for the development of the ejector type gas-nozzle were determined, and (2) it became clear that the Weber number We of liquid-jet, when plotted on logarithmic graph paper, changed linearly with the Reynolds number Re of the aspirated gas flow according to the relation We=bRem. Then, (3) the expression for predicting the ζ, the ratio of the aspirated gas flow Qg to the liquid-jet flow QL, was derived from the above We-Re relation.
    View full abstract
    Download PDF (1301K)
  • Studies on Rice Milling under Vacuum
    Satoshi MURATA, Akio TAGAWA, Sadato ISHIBASHI
    1989 Volume 51 Issue 2 Pages 85-89
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_85
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The rice milling under vacuum was made to prevent quality reduction of milled rice with the rise of temperature and the oxidation. As the results, we find the oxidation and the rise of temperature could perfectly be prevented.
    The cracks on the surface were observed and analyzed, and a concrete method to prevent the cracks was suggested.
    View full abstract
    Download PDF (704K)
  • [title in Japanese]
    [in Japanese]
    1989 Volume 51 Issue 2 Pages 93-99
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_93
    JOURNAL FREE ACCESS
    Download PDF (1373K)
  • [title in Japanese]
    [in Japanese]
    1989 Volume 51 Issue 2 Pages 99-104
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_99
    JOURNAL FREE ACCESS
    Download PDF (3840K)
  • [title in Japanese]
    [in Japanese]
    1989 Volume 51 Issue 2 Pages 105-112
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_105
    JOURNAL FREE ACCESS
    Download PDF (3805K)
  • [title in Japanese]
    [in Japanese]
    1989 Volume 51 Issue 2 Pages 112-116
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_112
    JOURNAL FREE ACCESS
    Download PDF (5971K)
  • [title in Japanese]
    [in Japanese]
    1989 Volume 51 Issue 2 Pages 117-122
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_117
    JOURNAL FREE ACCESS
    Download PDF (991K)
  • [title in Japanese]
    [in Japanese]
    1989 Volume 51 Issue 2 Pages 122-130
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_122
    JOURNAL FREE ACCESS
    Download PDF (1417K)
  • [title in Japanese]
    [in Japanese]
    1989 Volume 51 Issue 2 Pages 131-134
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_131
    JOURNAL FREE ACCESS
    Download PDF (2604K)
  • [title in Japanese]
    [in Japanese]
    1989 Volume 51 Issue 2 Pages 135-139
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_135
    JOURNAL FREE ACCESS
    Download PDF (2524K)
  • Know-How of Rice Property Measurement
    Ritsuya YAMASHITA, Kiyokazu GOTO
    1989 Volume 51 Issue 2 Pages 141-144
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_141
    JOURNAL FREE ACCESS
    Download PDF (2099K)
  • [title in Japanese]
    1989 Volume 51 Issue 2 Pages 145-165
    Published: 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.51.2_145
    JOURNAL FREE ACCESS
    Download PDF (2992K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top