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T. TAKEDA
1992 Volume 54 Issue 6 Pages
1-2
Published: 1992
Released on J-STAGE: April 30, 2010
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Measurement on Equivalent Mass of Four Wheeled Tractor-Implement System
Jun SAKAI, Junichi TAKEDA, Ryo TORISU
1992 Volume 54 Issue 6 Pages
3-11
Published: 1992
Released on J-STAGE: April 30, 2010
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This paper describes equivalent mass, which is used for predicting dynamic characteristics like transient responses of the system, of a four wheeled tractor-implement system. The values of equivalent mass depend on gear ratio are expressed as a coefficient divided by the total mass. The tractor-implement system was disassembled and the moment of inertia of each rotating components, which form the drive train from the clutch to the output shaft, were measured to calculate equivalent mass by the trifilar pendulum system.
From the results, the coefficient of equivalent mass on the tractor itself is 5.77 and 0.15 for 1st and 8th gear respectively. The coefficient is rather bigger than that of an automobile.
The coefficient becomes bigger when the system has a rotary tiller which includes parts with high moment of inertia such as the rotary shaft.
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Mesurements of Surface Profile and Bulk Density
Kiyoshi TAJIMA, Koji TAMAKI, Tadashi KOBAYASHI
1992 Volume 54 Issue 6 Pages
13-19
Published: 1992
Released on J-STAGE: April 30, 2010
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Possibility of knowing some properties, such as surface profile and bulk density of sand, by measuring the horizontal components of resistance and acting point on the vertical tine traveling through sand was examined. Cylindrical soilbin with rotative mechanism was used to reduce efforts for refilling the sand in the soilbin and assure uniformness of this sand.
In the experiments under the sand condition refilled by this soilbin, the horizontal components of resistance working on the tine under constant depth had similar frequency distribution, showing uniform sand condition obtained by rotating the soilbin. It will be possible to predict the surface profile of sand and the change of bulk density in sand by these measurements.
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Soil Bin Studies on Tine Implements
Shun-nan SHEN, Osamu KITANI, Tsuguo OKAMOTO, Tooru TORII, Satoshi YONE ...
1992 Volume 54 Issue 6 Pages
21-29
Published: 1992
Released on J-STAGE: April 30, 2010
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The objective of this study was to examine the characteristics of narrow tines for minimum tillage, and to examine the methods using artificial intelligence for the selection of reduced tillage system and tillage tools suitable to the different soil texture, climate and crop conditions.
In order to examine the characteristics of rigid-tines and spring-tines, soil bin experiments were conducted in this report. Shearing processes in soil caused by rigid-tines and spring-tines were observed and the relationship between resistance and tine displacement was measured. Furthermore, experimental study of tines was conducted to examine the dynamic charactristic of soil failure and resistance of rigid-tines and spring-tines. Relationships were examined among the peak force, through force, average force, cycle, area of soil failure, working depth/width ratio, rake angle of tine, working speed and elasticity of tine.
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Improvement of Straw Splitting Device
Kouhei TASAKA, Youichi SHIBATA, Kensuke AMANO
1992 Volume 54 Issue 6 Pages
31-40
Published: 1992
Released on J-STAGE: April 30, 2010
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To improve the straw splitting device which was attached to the head feeding combine, the shape of straw splitting cutter and the structure, performance and load characteristics of new straw splitting devices were examined.
The new splitting device consists of revolving shafts made of steel pipes with a diameter of 50mm and roll-type straw splitting cutters in which the vertical ditches of one cutter face the projections of another.
Submerging, for over three days and puddling under low water level reduced the floating rate of straw to about 1%.
The power requirement of the straw splitting device (4th model) is three or six times as that of conventional disk-type straw cutter on the market, but it was confirmed that the power requirement can be reduced by raising revolution speed.
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Mikio UMEDA
1992 Volume 54 Issue 6 Pages
41-49
Published: 1992
Released on J-STAGE: April 30, 2010
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This study presents a proof of previously reported threshing mechanism theory for Japanese type head feeding combine, and the possibility of ear-breaking control and sensing in experiments were confirmed using two kinds of model threshers.
For this purpose, ear-head motion is observed in strobe-picture, and threshing tooth strain is measured using strain gage.
Though the condition is restricted to one stem of rice without leaves, the threshing theory is proved by the observation and the analysis of threshing energy. It is possible to control ear-breaking by means of changing posture between threshing tooth and head. Also, if we use strain gage, the sensing of ear-breaking is capable.
Furthermore, the model thresher under the threshing condition based on the threshing theory has the same performance as current Japanese type head-feeding thresher.
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Drying Characteristics of Buckwheat on Thin Layer
Shoji TAHARAZAKO, Kazuo MORITA, WEI
1992 Volume 54 Issue 6 Pages
51-56
Published: 1992
Released on J-STAGE: April 30, 2010
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The drying characteristics of buckwheat which contained high moisture in the initial stage were investigated at various drying air temperature (10-50°C) and experimental data were analyzed using an exponential model on the presumption that the drying process can be treated as heat-and-mass transfer on the thin layer. The drying rate was distingished between first and second falling drying rate period. The relationships between drying rate and moisture content, and between moisture ratio and drying time were investigated. The drying constants for various drying temperature were calculated by two different methods and the difference of resultant values in the drying constant were discussed. Finally, the drying constant was expressed as a function of drying temperature in an empirical formula.
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Jinzo NAGAHIRO, Ken HIGUCHI, Yasushi WATANABE
1992 Volume 54 Issue 6 Pages
57-64
Published: 1992
Released on J-STAGE: April 30, 2010
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The drying method of a current grain dryer such as a circulation-type dryer has essential defects as an increase of damaged grain and the taste reduction, since the drying air of the dryer is too hot. In order to remove these difficulties in the dryer, a drum-type fluidized dryer has been proposed here. The experimental study, by using the prototype of the proposed dryer, on drying rough rice showed (1) high drying rate, (2) low probability of damaged or cracked grain, as well as uniform moisture content, and (3) improved taste in comparison with the current dryer.
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Comparison between Dehulling Experiments and the Theory
Yoshio NISHIYAMA, Yutaka KIKUCHI, Takuma SHISAI
1992 Volume 54 Issue 6 Pages
65-71
Published: 1992
Released on J-STAGE: April 30, 2010
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Energy consumption, husking ratio, crack ratio and broken rice ratio with respect to various rotational speed (
N) of the dehulling fan (700-3000rpm) were measured from dehulling experiments of the commercial rice husker with a standard impeller blade and a new type of blade. The new type of blade was so designed as to get less bouncing of paddy grain at the surface of the blade considering normal force distribution.
Energy consumption was proportional to
N2, which is agreed with the law of proportion in terms of rotating angular velocity proposed by the first author in the former report (part I).
Husking ratio was expressed by the Weibull distribution function with respect to energy consumption. Crack ratio and broken rice ratio for the newly designed blade, were lower than those for the standard blade.
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Identification of Non-parametric Models
Toru TORII, Tuguo OKAMOTO, Osamu KITANI, Takayuki OCHIAI
1992 Volume 54 Issue 6 Pages
73-79
Published: 1992
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Control of water stress to the plant is one of the important technologies for greenhouse and field cultivation. The quality of the crops might be improved by optimizing control of water stress. In this study, the plant's responses to the randomly varying two levels of light intensity were measured, and the frequency characteristics of the plant were calculated. Cross correlation functions with varied light intensity and transpiration, diameter, and leaf temperature were calculated. The result showed time lag of these functions were about 4min., 8min., and 1min. respectively. The step response of the lighting to the plant was also measured, and the frequency characteristics under random lighting condition and from step response showed good agreement.
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Exposure of Culture Plantlet to the Field
Masaki MATSUO, Toshitaka UCHINO, Mariko OHMURA
1992 Volume 54 Issue 6 Pages
81-88
Published: 1992
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For the purpose of studying the effect of electric field on plant growth, apple mints were cultured for twenty days, exposing to the alternating field of distorted wave at 0.5kV.
Under the continuous exposure through light and dark period, the growth ratio of the plantlet fresh weight to the control was maximum, and fresh weight and length of root increased remarkably after 9 days. Under the light period exposure, the ratio was maximum and root grew notably after 19 days. Under the dark period exposure, the ratio after 14 days was maximum and the root dry weight increased significantly.
The ratio generally increased due to the water absorption, as the ratio of dry weight was smaller than that of fresh weight.
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Moisture, Protein, Fat Acidity of Brown Rice and Milled Rice
Motoyasu NATSUGA, Shuso KAWAMURA, Kazuhiko ITOH
1992 Volume 54 Issue 6 Pages
89-94
Published: 1992
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The Use to Water of Culture Medium
Masaki MATSUO, Toshitaka UCHINO
1992 Volume 54 Issue 6 Pages
95-99
Published: 1992
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Masashi UWASAWA
1992 Volume 54 Issue 6 Pages
101-105
Published: 1992
Released on J-STAGE: April 30, 2010
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[in Japanese]
1992 Volume 54 Issue 6 Pages
108-110
Published: 1992
Released on J-STAGE: April 30, 2010
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[in Japanese]
1992 Volume 54 Issue 6 Pages
111-114
Published: 1992
Released on J-STAGE: April 30, 2010
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[in Japanese]
1992 Volume 54 Issue 6 Pages
115-121
Published: 1992
Released on J-STAGE: April 30, 2010
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[in Japanese]
1992 Volume 54 Issue 6 Pages
122-129
Published: 1992
Released on J-STAGE: April 30, 2010
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[in Japanese]
1992 Volume 54 Issue 6 Pages
130-133
Published: 1992
Released on J-STAGE: April 30, 2010
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[in Japanese]
1992 Volume 54 Issue 6 Pages
134-139
Published: 1992
Released on J-STAGE: April 30, 2010
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[in Japanese]
1992 Volume 54 Issue 6 Pages
140-143
Published: 1992
Released on J-STAGE: April 30, 2010
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