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 54, Issue 5
Displaying 1-13 of 13 articles from this issue
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  • [title in Japanese]
    T. SUGAWARA
    1992 Volume 54 Issue 5 Pages 1-2
    Published: 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.54.5_1
    JOURNAL FREE ACCESS
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  • Studies on Adjustable Lug Type Traction Aid for Farm Tractor (Part 3)
    On the Automatic Operation System
    Minoru KOMATSU, Hideo HIGUCHI, Kazuyoshi NONAMI
    1992 Volume 54 Issue 5 Pages 3-8
    Published: 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.54.5_3
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    Test results on a system, in which an adjustable lug type traction aid is automatically operated corresponding to the magnitude of travel reduction of tractor, is reported.
    By using a ratio control and a constant value control for the adjustable lug, stable operations were observed in the travel reduction higher than 15%, and the effects of the increase of tractive force and the decrease of travel reduction were confirmed on paddy and upland fields.
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  • Research on Attitude Control of Tractors for Sloping Ground (Part 3)
    Response Characteristics of Servo Valve Sensor with Acceleration Input
    Isao TAJIRI, Kunio SATO
    1992 Volume 54 Issue 5 Pages 9-17
    Published: 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.54.5_9
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    As an inclination control sensor for a tractor used for sloping ground, a servo valve sensor with acceleration input was made for trial, and its response characteristics were elucidated. The sensor was composed of a jet pipe servo-valve, a cantilever spring and a weight, and responding to the acceleration acting on the weight, the jet pipe and an oil hydraulic circuit work. At the time of the trial manufacture, the equation of motion for the servo system was derived, and the transfer function was determined to analyze the frequency characteristics. Further, taking the position of setting the sensor up in consideration, and simulating the flow rate of working oil, it was confirmed by the performance experiment that the equation of motion is appropriate. It became clear in the experiment on the step response that the effect of the natural frequency was little, and the servo system was stable.
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  • Dynamic Compaction Characteristics for the Unsaturated, Undrained Conditions of Soil under Cyclic Loading
    Olukayode A. ADEBIYI, Masayuki KOIKE, Toshio KONAKA, Shigeru TANI
    1992 Volume 54 Issue 5 Pages 19-28
    Published: 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.54.5_19
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    Multiple passages of agricultural equipment over soil impose a cyclic loading condition on soil. In response to such loading, the soil may yield by shear and compression. The resistance characteristics of soil to repetitive uniaxial loading is investigated for the consolidated undrained conditions of an unsaturated soil. In addition, the static undrained strength of the soil is determined from an unsaturated UU test. The cyclic stress ratio was employed in the evaluation of the relationship between axial load and the number of cycles Nc. It was not possible to ascertain the interrelationship between the effective stress, Nc and frequency for cyclic stress ratios higher than 0.4. As a result of the gain characteristics, there seemed to be a cyclic stress ratio at which the axial deformation was a maximum. Also, a rapid build up of pore water pressure was observed to lead to an early yielding of the soil.
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  • Fundamental Studies on the Soil Cutting by Straight Wire Blade (Part 1)
    Focusing on the Occurrence Pattern of Slip-line
    Masayuki KOIKE, Shotaro YUZAWA, Toshio KONAKA, Toshihiro TOJO
    1992 Volume 54 Issue 5 Pages 29-35
    Published: 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.54.5_29
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    The indoor experiments have been undertaken placing practical emphasis on the newly-proposed mechanism of soil cutting by straight wire blade. In this analysis, the occurrence pattern of slip-line and the related force characteristics were focused for further discussions. Up to 2mm of wire diameter, the initial maximum holizontal force did not show clear relationship with wire diameter under less soil hardness condition. The vertical force takes only 4.0 to 12.6N which is tantamount to the specific proportion from 1/3 to 1/10 of it for holizontal force. The occurrence pattern of slip-line heavily relies on bulk density of soil, when keeping wire diameter and cutting velocity constant. Reproducibility of slip-line is also convinced.
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  • Grain-Straw Separation using Air Stream (Part 1)
    Basic Study on Separating Capacity
    Yu NIU, Satoru NAMBU, Munehiro TAKAI, Shun-ichi HATA, Kenshi SAKAI
    1992 Volume 54 Issue 5 Pages 37-45
    Published: 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.54.5_37
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    A unique grain-straw separation system using air stream was devised. Grain-straw mixtures are fed on the screen conveyor which passes over the outlet of the air stream. The layer of mixtures is lifted up and loosened by the air stream. During the loosening of the mixture layer, the grains are separated from straws and dropped down through the screen conveyor.
    In order to investigate the practicability of this separating method, basic experiments were conducted by a batch separation system. The relation between the motion of straw layer and the grain separation, and the effect of the amount of straw and the number and time of air stream application on separating capacity were clarified. As a result of this research, it was concluded that this method would be effective for the practical grain-straw separation.
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  • Studies on the Improvement of the Straw Cutter Attached to a Head-Feeding Combine (Part 1)
    Development of Straw Splitting Device
    Kouhei TASAKA, Youichi SHIBATA, Yoshiaki GOTO, Tsutomu IJIRI
    1992 Volume 54 Issue 5 Pages 47-56
    Published: 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.54.5_47
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    Barley or wheat straw had been mixed in the soil customarily in double cropping system between rice and barley or wheat. A study was conducted to sink the straw more effectively which usually drifts on the flooded paddy fields after puddling.
    Noticing that the sinking rate of split straw is very high, a device to split straw with straw cutter mounted on a head-feeding combine was designed and tested.
    The straw splitting device (prototype), equipped with a roll-type cutter having vertical and horizontal ditches with 2mm depth, was developed by improving currently marketed disk-type straw cutter.
    In the field test, the device split the straw continuously. The floating rate of the straw after cultivation and puddling was 0.5%, showing exceptionally high performance.
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  • Development of Precision Control System for Agricultural Semi-Trailer Tracing the Track of Tractor (Part 1)
    Development of Control Method and Investigation of Adaptability to In-Line Type Trailed Machinery
    Tomohiro TAKIKAWA, Nobuki YAMANA, Akira HIRATA
    1992 Volume 54 Issue 5 Pages 57-65
    Published: 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.54.5_57
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    To improve tracking performance of a semi-trailer type agricultural implement, a steering control method of the trailer wheels was developed. The basic concept of the steering method is to make steady state turning radius of the tractor and that of the trailer the same. The equation which expresses the above geometrical relationship between the tractor and the trailer was derived.
    According to the equation, we proposed an active steering control method, in which the trailer wheels are controlled as a function of the steering angle of the tractor wheels and the angle between the tractor and the trailer. And the method was implemented in a prototype trailer.
    From the experimental results by use of the prototype trailer, it has been confirmed that the method make the off-tracking of the trailer nearly zero.
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  • Finite Element Approach to Heat Conduction Problems during Precooling Fruits and Vegetables with Two-Layer Structure
    Shun'ichlro TANAKA, Sadato ISHIBASHI, Hiroshi SATOU
    1992 Volume 54 Issue 5 Pages 67-73
    Published: 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.54.5_67
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    The main purpose of this paper is to show how to obtain each thermal diffusivity of the juice vesicles and the rind of fruits and vegetables as a shaddock with the thicker peeling, which is considered to be an axisymmetric body of arbitrary shape with two-layer structure. A two-layer model sphere and a shaddock were used in this work.
    In result, primarily, the each conductivity of a two-layer model sphere was determined by means of hydro-cooling experiment of the model sphere and the trial and error method using finite element method. Secondarily, from the comparison of the solution of heat transfer by the trial and error method using finite element method and the curve of time temperature data in hydro-cooling of a shaddock, the thermal diffusivity of the juice vesicles and the rind of a shaddock were determined to be α1=6.84×10-4, α2=4.44×10-4m2/hr respectively.
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  • Studies on the Mechanical Harvesting of Peanuts (Part 2)
    Trial Manufacture and Performance Test of the Self Propelled Digger Screw Type Peanut Harvester
    Suryo BUSONO, Akira ISHIHARA, Masami IWASAKI
    1992 Volume 54 Issue 5 Pages 75-84
    Published: 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.54.5_75
    JOURNAL FREE ACCESS
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    A self propelled peanut harvester having a pair of digger screws for digging the soil was designed and manufactured to harvest peanuts in a sandy field. The performance test of the harvester in a sandy field, the harvesting rates of stumps or stubs and peanut pods were achieved at 100% and 90-92% respectively under the working speed range of 0.81-1.2km/h and the digger screw peripheral speed range of 0.82-0.88m/sec. The loss of peanut pods was 4.5% on average by the harvester and about 4% of the pods already separated from the stems inside the soil before harvesting.
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  • Determination of the Quantity of Soybean Protein Products in Beef-Soy Blends
    Ken-ichi ISHIBASHI, Kazunori HIRONAKA
    1992 Volume 54 Issue 5 Pages 85-91
    Published: 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.54.5_85
    JOURNAL FREE ACCESS
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    The amount of moisture, protein, fat, carbohydrate and ash in ground beef, various soybean protein products and beef-soy blends was determined. The data of the chemical analysis were examined by a linear programming method. Mixing ratios of each beef-soy blends calculated by computer were compared with actual ones, and analysed statistically.
    The difference between Soyafluff 200W (S 200W) and Textured soy protein (TSP) could not be detected by this computer program, because of the similarity in their amounts of chemical compositions. Mixing ratio of S 200W in beef-soy blends, therefore, was combined with that of TSP. Neither heat treatment of beef-soy blends nor different drying method of ground beef have caused any significant interference for the detection or the quantification of soybean protein mixed with beef. Using the 99% confidence limits, it was possible to evaluate the mixing ratio of each components in beef-soy blends to about ±3%. From these experiments, the mixing ratio computed was estimated with higher accuracy when all kinds of meats and vegetable proteins in meat products were known. Even though each components in meat products were unknown, this method could be applied to the estimation of non-meat proteins in meat mixture by the aid of standard table of food composition.
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  • Improvement of the Follow-up Mechanism of the Cross Blocking Weeder Fixated the Small Spike Tooth (Part 2)
    operating Performance
    Masafumi MITARAI, Toshio FURUCHI
    1992 Volume 54 Issue 5 Pages 93-101
    Published: 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.54.5_93
    JOURNAL FREE ACCESS
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  • The Specific Heat of Rice Bran Oil
    Makoto MURAKAMI, Hiroshi TAKENAGA, Akira HOSOKWA, Toru SIGA
    1992 Volume 54 Issue 5 Pages 103-106
    Published: 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.54.5_103
    JOURNAL FREE ACCESS
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