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Volume 45 (1983 - 198･･･
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Volume 45, Issue 2
Displaying 1-18 of 18 articles from this issue
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[in Japanese]1983 Volume 45 Issue 2 Pages 166-168
Published: 1983
Released on J-STAGE: April 30, 2010
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Problems on Cooling as well as MeasuresJinzo NAGAHIRO1983 Volume 45 Issue 2 Pages 169-176
Published: 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA small general purpose engine used mainly as a power source for agricultural machineries, under the circumstance of continuous operation at overload for a long time, must have two requirements which are (1) nonoverheating and (2) enough durability with good performance characteristics.
This study, from the viewpoint of issues mentioned above, has been achieved in terms of the following two purposes:
(1) To investigate problems on cooling and durability as well as measures, which should not deal with independently due to interacting each other, of the small air-cooled Wankel rotary engine.
(2) To provide both standard design parameters on cooling and durability, and materials for principal engine parts, which are required for the basic design.
This report discusses seveal issues as to (1) an axial flow air-cooling system of housings and (2) a charge-cooling system both to lubricate the needle roller bearings in an induction mixture passage and to cool the rotor with the mixture.View full abstractDownload PDF (3308K) -
Based on the Deformation Theory as Elastoplastic MaterialsJUN Chen, Hideo TERAO, Katsuhiro MATSUI1983 Volume 45 Issue 2 Pages 177-182
Published: 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA two dimentional soil cutting problem was studied through the finite element method which is based on the deformation theory of plasticity. By a uniaxial compression test the elasto-plastic behavior of soil was examined. According to its behavior the functional relation between the equivalent stress and the equivalent strain was developed. In order to simulate the frictional slide of soil being cut, states of every frictional freedom were determined corresponding to the mechanical state of the frictional node in every iteration. Once a convergent solution was reached in every displacement increment loop, we revised coordinates of connecting nodes. To deal with the gap phenomenon the stiffness of the elemnt in which the maximum main stress was greater than the tension strength of the soil was reduced.
In order to check whether the analysed results were correct, we performed a two dimentional soil cutting test, and we found that analysed cutting resistances roughly conformed to the measured ones.View full abstractDownload PDF (783K) -
Reduction of tillage resistance and energySatoshi YONEKAWA, Osamu KITANI, Tsuguo OKAMOTO, Kyoshiro MIURA, Kunio ...1983 Volume 45 Issue 2 Pages 183-189
Published: 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSBi-axial disk plow comprises a ordinary disk plow and a set of rotating blades which is attached to another shaft. This blade rotates, in the same direction as the disk, faster than the disk by using the rotating torque of the disk, which results from soil reaction. Due to the velocity difference between the disk and the blade, furrow slices are more pulverized by cutting or breaking under tensile stress. As the result the failure resistance is smaller than compressed shear fracture in ordinarry tillage device, as well as inverting and elevating furrow slices smoothly. The reduction of tillage resistance here means the reduction of tillage energy because the bi-axial disk plow uses waste energy effectively without adding extra energy. On top of that, the pulverization of soil is improved by the blade. The bi-axial disk plow is, therfore, considered as a type of minimum tillage device.
The tillage resitance of the bi-axial disk plow is about 1/2 (about 1/8 at minimum) compared with a ordinary disk plow. Thus the bi-axial disk plow will contribute much to saving energy in tillage operation.View full abstractDownload PDF (966K) -
Coating Methods and MaterialsSadami YADA1983 Volume 45 Issue 2 Pages 191-198
Published: 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTwo methods of coating seeds were tested in order to improve the quality of mechanical seeding. In the first paper, suitable methods and materials for the coat were investigated. Fluidizing method was found to be better than rotating method for the coating. When excess water existed in bed soil, germination rate fell in some species. The reason was thought that the coated layer became muddy because of its hydrophilic characteristics. When materials with hydrophobic radical were added, large cracks occured in the coated layer and brought a stable germination. In the second paper, coating mechanism was elucidated. The third paper dealt with the drying conditions of coated seeds, which were processed by fluidized drying equipment, and the germinability of coated seeds after storing under various conditions.View full abstractDownload PDF (1428K) -
Toshio MURATA, Shinroku MORITA1983 Volume 45 Issue 2 Pages 199-205,198
Published: 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAnalysis of droplet sizes or their numbers is very important for the low volume application in a greenhouse.
In this paper, the relationships between numbers of droplet and five items were investigated. The five items were type of agricultural chemicals, discharge rate, application rate, dry bulb temperature and relative humidity.
The following conclusions were drawn from the experiments. Blow head was a Pneumatic Atomizing Nozzle with Spray Set-up No. 1, Fluid Nozzle 2050, Air Nozzle 64, made by Spraying System Co., (U. S. A)
(1) Mean numbers of droplet per 0.25mm2 were 120-130 in droplet diameter of 0-5μm, 20-30 in 5-10μm, 2-10 in 10-100μm, respectively. The ranges of droplet number varied remarkably when spraying conditions differed.
(2) Multiple correlation coefficient values between droplet number and each item, at 1-7m distance from low volume sprayer, were 0.58-0.90. The values by droplet diameter ranges were 0.58-0.75 in 0-5μm, 0.66-0.75 in 5-10μm, 0.72-0.90 in 10-50μm, 0.74-0.86 in 50-100μm, respectively.
According as the droplet diameter was larger, multiple correlation coefficient became larger.
(3) In the case of 0-10μm in diameter, the items which have an effect on the numbers of droplet were discharge rate, dry bulb temperaturs and application rate in decreasing order. Meanwhile' beyond 50μm in diameter, those were dry bulb temperature, discharge rate, relative humidity. The differences between wettable powder and emulsifiable concentrate spraying had a least effect on numbers of droplet.
(4) The numbers of droplet sprayed at 21-24°C or higher were relatively more variable in the case of 0-10μm in diameter, and those sprayed at 18-21°C or lower were relatively more variable in the case of 10-100μm in diameter. Meanwhile, those obtained at 80% or higher in relative humidity were relatively more variable regardless of droplet diameter.
(5) Judging from the above results, it is considered that the optimum spraying conditions in greenhouse for low volume application is 15-24°C in temperature and 50-80% in relative humidity.View full abstractDownload PDF (1275K) -
Toshitake ARAMAKI, Takemi ABE, Jun YAMASHITA1983 Volume 45 Issue 2 Pages 207-214
Published: 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAs described in the previous report, the piano-wire blade, consist of universal joint mechanism, was designed so that it could be increased the durability for striking against the obstacle, such as the stone, but it has been bended sometimes under mowing for stony field condition. Improvements were undertaken to eliminate the above disadvantages of piano-wire blade, and SK universal blade was produced by way of experiment. Results of durability tests of SK blade indicated to be satisfactory. The bush cutter mounted SK blade was operated under varying condition to evaluate it performance and to determine whether it met the established design objectives.View full abstractDownload PDF (1210K) -
Haruo EZAKI, Iwao KUROISHI, Shotaro YUZAWA1983 Volume 45 Issue 2 Pages 215-222
Published: 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWe have been working on the metal wearing by flowing paddy from the viewpoint of the physical characteristic of paddy.
We have been got many research reports concerning the metal wearing at the rice handling devices of agricultural machinery, but any reports have not cleared factors involved in wearing.
Some factors of abrasive wearing of metal by paddy are cleared in this study.
1. The longer the distance of friction between metal and paddy, the larger the abrasion, namely, the longer the friction time, the more the wearing.
2. The rougher the surface of paddy, the larger the action of wearing.
3. The larger the contact pressure between paddy and metal, the larger the action of wearing.
4. The metal wearing (W) by paddy may be indicated by the following formula. W=aLαfβ(γ)R where L is the friction distance, f is the contact pressure, R is the surface roughness of paddy and a, α, β and γ is the coefficient.View full abstractDownload PDF (1280K) -
An Investigation of Intermittent Drying Process with Two-Tanks ModelKiyohiko TOYODA, Takaaki MAEKAWA, Shingo YAMAZAWA, Sadao UEDA1983 Volume 45 Issue 2 Pages 223-228
Published: 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe intermittent drying method adopted widely in grain drying has been introduced to prevent deterioration of grain quality.
However, the intermittent drying method was related not only to grain quality but also to drying characteristics and tempering effect, which resulted in increase of drying rate after tempering period.
This effect was not explained theoretically untill moisture distribution within grain could be calculated with the Sphere Drying Model.
With “Two-Tanks Model” in which husk played important role in moisture transfer in contrast to the Sphere Drying Model which neglected the presence of husk, the intermittent drying process was studied and tempering effect was explained in this investigation.
Especially, the authors studied the suitability of “Two-Tanks Model” to exprimental data and obtained the knowledge of moisture transfer during tempering period.View full abstractDownload PDF (886K) -
Yasuhisa SEO, Akira HOSOKAWA1983 Volume 45 Issue 2 Pages 229-234
Published: 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIt was found in previous study that the increment in sugar content of banana pulp in artificial banana ripening was closely correlated with CO2 evolved by banana and also that change in CO2 evolution rate was predictale when ripening temperature was lowered within the variation of 2.5°C. In this study, these previous results were applied to examine the agreement between calculated CO2 evolution rate with ripening temperature schedule and that measured in experiment. And it was observed that both CO2 evolution rates were in good agreement and this resulted in good correspondence also between calculated and measured sugar contents of banana pulp in artificial banana ripening. The results in this study suggested the possibility of automatic operation of artificial banana ripening in which ripening temperature could be controlled by evolved CO2 by banana.View full abstractDownload PDF (836K) -
Satoshi MURATA, Shingo MIYAMOTO1983 Volume 45 Issue 2 Pages 235-237
Published: 1983
Released on J-STAGE: April 30, 2010
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Yoshiaki MISAO, Minoru KOMATSU1983 Volume 45 Issue 2 Pages 239-244
Published: 1983
Released on J-STAGE: April 30, 2010
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Ritsuya YAMASHITA1983 Volume 45 Issue 2 Pages 245-248
Published: 1983
Released on J-STAGE: April 30, 2010
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Properties of Woody pellettToshio IWAO1983 Volume 45 Issue 2 Pages 249-251
Published: 1983
Released on J-STAGE: April 30, 2010
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1983 Volume 45 Issue 2 Pages 252-253
Published: 1983
Released on J-STAGE: April 30, 2010
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Shigeo UMEDA, Kentaro MOHRI1983 Volume 45 Issue 2 Pages 254-256
Published: 1983
Released on J-STAGE: April 30, 2010
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Zennosuke MATSUYAMA1983 Volume 45 Issue 2 Pages 257-260
Published: 1983
Released on J-STAGE: April 30, 2010
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[in Japanese]1983 Volume 45 Issue 2 Pages 261-264
Published: 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (704K)
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