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 46, Issue 2
Displaying 1-20 of 20 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1984 Volume 46 Issue 2 Pages 155-156
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_155
    JOURNAL FREE ACCESS
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  • Study on Vibration and Noise Reduction of Tractor Cab (Part 4)
    Effect of Actual Cab Suspension on Vibration and Noise Reduction
    Akira OIDA, Takashi TANAKA
    1984 Volume 46 Issue 2 Pages 157-162
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_157
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    An actual cab suspension system was designed and constructed based on the study results about the effect of model cab suspension on vibration and noise reduction. The effect of actual suspension was investigated at the state of where the air borne sound and resonance existed, too. As the results the vibrations of the cab were repressed by the suspension. The sound pressure level in the cab was reduced but it showed a slight higher value than that of fixed cab at some engine speeds. The noise level was reduced only a little because of high frequency components of sound. But the big reduction of sound pressure level in low frequency domain under 200Hz indicated that the cab suspension system had an obvious effect on reducing the solid borne sound.
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  • Analysis of the Soil Deformation beneath a Wheel by the Finite Element Method (I)
    Soil Deformation beneath a Rigid Wheel taking account of the Friction between a Wheel and Soils
    Tatsuo HIROMA, Yoshinobu OHTA, Keisuke SUYAMA
    1984 Volume 46 Issue 2 Pages 163-171
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_163
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    In order to investigate the trafficability and the tractive performance of a wheel-type tractor, a deformation of soils beneath a wheel was analyzed by the finite element method, taking account of the friction between a wheel and soil masses. In this analysis, a wheel and soils were assumed to be a rigid and elastic bodies, respectively. Besides, displacments of soil surface caused by a sinkage and a slip of a wheel were input as a boundary condition in the calculation, letting a wheel be sunk and rolled gradually in soils.
    From that analysis, distributions of stress and strain in soils were clarified. Further, relationships between a slippage and a coefficient of net traction or a tractive efficiency were obtained, from which it was indicated that the tractive efficiency becomes maximum before a relative slip occurs over the entire contact surface of a wheel and soil masses.
    Analysis of soil deformation beneath an elastic wheel will be reported in the next paper.
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  • [title in Japanese]
    1984 Volume 46 Issue 2 Pages 172-172,182
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_172
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  • Fundamental Studies on Running Resistance of Head-feeding Combines (I)
    Influence of profile and dimension of running track using models
    Haruo EZAKI, Atushi SAWAMURA
    1984 Volume 46 Issue 2 Pages 173-181
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_173
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    This running resistance measuring test using combine models was conducted for the purpose of improving the combine's trafficability on wet paddy field. These models were simplified to the tracks with 1/3 of two rows head-feeding type combine. The influence of track width, nominal track contact length and angle of approach on the running resistance for various soil conditions were observed.
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  • Studies on Tractor Safety Frame (I)
    Comparison of Overturning Tests and Pendulum Tests
    Fumitake ISHIKAWA, Kyoshiro MIURA
    1984 Volume 46 Issue 2 Pages 183-188
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_183
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    Overturning tests and pendulum tests of tractor fitted safety frame were carried, as a first step to propose design criteria of safety frame/cab.
    On pendulum tests, frames deflected parmanently larger than on overturning tests, because input energy of pendulum test includes safety margin. From test results some points were pick uped as below. 1) Pendulum test provided by OECD TEST CODE can be applied for medium power class domestic tractors, 2) to design safety frame, mounting method is slso important, 3) structural analysis of safety frame needs to apply plastic analysis and dynamic of material.
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  • Studies on the Development of a Screw Type Soybean Thresher (Part II)
    Threshing Characteristics of Screw Type and Tangential Type Threshing Mechanisms
    Tomohiko ICHIKAWA, Takao SUGIYAMA, Masao MANAKA
    1984 Volume 46 Issue 2 Pages 189-195
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_189
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    The outline and the proper specification of main structures of the screw type threshing mechanism were presented in the previous report. Basic threshing characteristics of this mechanism such as threshing efficiency, percentage of damaged grains, grain passing rate through the concave and power requirement for threshing were compared with the tangential threshing mechanisms with single or double cylinder which are widely applied to the conventional soybean threshers, and the relative advantages of the screw type threshing mechanism were clarified. Further, the suitable threshing conditions such as cylinder speeds, moisture contents of soybean and grain feed rate were proposed.
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  • Adaptive Feed Rate Control of Small Combine Harvester (III)
    Analysis of Control System and Simulation
    Tsuneo KAWAMURA, Isao NISHIMURA
    1984 Volume 46 Issue 2 Pages 197-204
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_197
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    In the part I, the digital sampled-data adaptive control system which can control the traveling speed and the feed rate setting values by the logical operation was investigated. In the part II, it as reported that the good results were obtained from the field experiments. This control system involving many linear and non-linear elements, digital sampler, and 0-order hold in its its controlling loop, can be considered as a multi-inputs and multi-outputs control system with the logical operation. So the analysis of system must be done as a non-linear sampled-data control system. In this paper, the analysis of controling characteristics was done by use of a digital simulation.
    The results obtained from the simulation were satisfactorily agreed with the field experiment at ones. Because the initial setting values of feed rate and its dead zone width were set lower and narrower respectively, and the rate of traveling speed change was set at about 0.026m/s2, it was found from the results of simulation that each phenomena was put into a steady state quickly and the good controlling results were obtained.
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  • Studies on the Movable Type Crop-bed System in Greenhouse (2)
    Development of the Movable Type Crop-bed System and its Performance Test
    Isamu KURATA
    1984 Volume 46 Issue 2 Pages 205-210
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_205
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    The movable type crop-bed system to be newly developed was placed in a greenhouse covering the area of 83m2, and composing of 33 growing boxes, 39m length wheel conveyer's circular line, the endless chain and the system controller. The growing boxes were connected eache other with the endless chain and were moved on the wheel conveyers line with a system controller. The weight of a growing box including soil and tomato under growing was about 160kg. The actual travelling speed of the growing box was lower than 8cm/s. The power required for driving this system was about 151W when being operated continuously at 8cm/s. The vibration on the growing box was less than 9.02cm/s2 when it is as operated at 8cm/s. On this level of the vibration, no excessive effects of the vibration on the crop was observed.
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  • Studies on the Distribution of Particles through Distributing Pipe
    Masaru TERADA, Yoshiaki NAKAMURA, Noboru KAWAMURA
    1984 Volume 46 Issue 2 Pages 211-218
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_211
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    In order to distribute particles uniformly, we made distributing pipe for trial with a rectangua section and 16 orifices for sending air, on the upper surface of the pipe.
    Experiments were carried out on the coefticient of loss of the head due to branch and confluence of air stream in the pipe. After transporting the particles into the pipe, we obtained the successful distributing particles.
    The results are summarized as follows:
    (1) When an air sending orifice was situated 10mm apart from counterside of the distributing hole, the maximum amount of distributed particles was attained.
    (2) In the case of branch and confluence of air were coincide, the amount of branched air was slways slightly more than that of confluencing air. The coefficient of branch-confluence was changed according to the ratio of air flow, varying from 0.08 to 1.0.
    (3) By sending the air from air sending orifices, pressure head increased and velocity head decreased. Whereas, head differences between pipe ends lessened as compared with the case of pipeduster.
    (4) Uniform distribution of particles can be attained by controlling the amount of sending air in correspondance with the position of the distributing pipe.
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  • Load Fluctuations of Agricultural Equipments
    The Torque Fluctuation of a Disk Mower and a Tedder
    Kuniji MOTOHASHI, Katsuyuki TANAKA, Toshiyuki TAKAHASHI
    1984 Volume 46 Issue 2 Pages 219-224
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_219
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    Authers analyzed random load of a disk mower and a tedder by using the stress and frequency analyzer.
    As the results, the torque and the frequency of the disk mower and the tedder were shown in Figs. 3 and 4. The relationship between the torque and the frequency was shown by a exponential equation (1). From this equation, the mean torque and the maximum torque of the working disk mower and the tedder are provided in Figs. 6 and 7.
    The value of the mean torque is almost the same as those of other reserchers. But the maximum torque is not the same. It depends on the frequency. This results show the necessity to search the relationship between the stress and the frequency for a random load.
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  • Studies on Intellectualization of Agricultural Machinery (On the Artificial Tactile Sense)
    Part 1; Experimental Apparatus for Measuring Dynamic Mechanical Properties of Farm Products
    Yoshio IKEDA
    1984 Volume 46 Issue 2 Pages 225-232
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_225
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    The sensing devices by which the intelligent farm robot acquires the informations on the operating enviroments and objects correspond fundamentally to the five senses of human being. This research is concerned with the tactile sense, that is, the method of measuring on real time the dynamic mechanical properties of the farm products without giving the destruction or damage to them are discussed. The final goal of this research is to develop the artificial tactile sense which can evaluate the quality and maturity of the farm products and realize the stable grasp of them.
    In this paper, the measuring principle and device controlled by the digital computer are discussed and the results of some fundamental experiments are presented. The system function (frequency response function) of the viscoelastic cubic sample grasped between the exciter and sensor can be estimated in real time (about 16s) from the input and output signals observed during excitation by the stationary random force.
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  • Safety Cabs/Frames and Their Testing (3)
    Test Apparatus
    Yoshiaki MORI, Osamu YUKUMOTO, Akira HIRATA, Masamitsu TAKAHASHI
    1984 Volume 46 Issue 2 Pages 233-237
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_233
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  • Separating Characteristics of a Shaking Separator (I)
    Size and Shape of the Shaking Table
    Hatsuo KOJIMA, Ritsuya YAMASHITA
    1984 Volume 46 Issue 2 Pages 238-242
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_238
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  • Operation of Head-feeding Combine
    Seat and Controls
    Keiji AJIKI, Masato SUZUKI, Tetsuro CHIBA, Makoto NAKANO
    1984 Volume 46 Issue 2 Pages 243-247
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_243
    JOURNAL FREE ACCESS
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  • Analysis of Tractor Mobility
    Jitsuo YOSHIDA
    1984 Volume 46 Issue 2 Pages 248-252
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_248
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  • Effect of Rice Processing Method and Storage Condition on Quality Change
    Ritsuya YAMASHITA
    1984 Volume 46 Issue 2 Pages 253-255
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_253
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  • [title in Japanese]
    Akira ISHIHARA
    1984 Volume 46 Issue 2 Pages 256-260
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_256
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  • More Interest in the System and Information on Patent is required at Universities
    Tomoyuki NAKAMURA
    1984 Volume 46 Issue 2 Pages 261-263
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_261
    JOURNAL FREE ACCESS
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  • Utilization of Direct Combustion Type Husk Burner at Grain Drying and Processing Facility
    Masami TANAKA
    1984 Volume 46 Issue 2 Pages 264-269
    Published: 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11357/jsam1937.46.2_264
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