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Volume 57, Issue 4
Displaying 1-11 of 11 articles from this issue
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A. SASAO1995 Volume 57 Issue 4 Pages 1-2
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1836K) -
Comparison between Pivot Turn and Soft Turn SystemsJie BAI, Nobutaka ITO, Koji KITO, Xieulun WANG1995 Volume 57 Issue 4 Pages 3-9
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSPivot turn is one of the most common turning systems for tracked vehicle, in which one crawler is powered and the other is unpowered and braked while turning. Recently, a different type of turning system which is called “soft turn” has been devoloped from the viewpoint of giving less damage to the ground surface during turning motion. The velocity of the outer crawler in this system is three times faster than the inner crawler. In this paper, the soft turn system is compared to the conventional pivot turn system from the viewpoint of turning motion resistance, work done and power required while turning.View full abstractDownload PDF (823K) -
Keiji WATANABE, Masanori KITANO, Tadatsugu KAKINO1995 Volume 57 Issue 4 Pages 11-16
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the previous paper, in order to disclose the maneuverability of tracked vehicles on an inclined ground, a mathematical model which considered the effect of track width and the characteristics of the track-ground interaction was developed, and numerical data were compared wlth the experimental data by using a scale model. In this paper, the constrain conditions and the equations of motion to maintain the tracked vehicle on a contour line of an inclined ground without lateral downward slip were developed, and the numerical analysis using specifications of an example vehicle on running conditions and steering input was conducted. It was found from these analysis that the tracked vehicle can traverse on a contour line, if the attitude of the tracked vehicle directs up-slope and is given optimum steering inputs.View full abstractDownload PDF (707K) -
Drying Characteristics and Heat Balance in Plane Surface BedYasunobu KUDO, C. I. NINDO, Eiji BEKKI1995 Volume 57 Issue 4 Pages 17-25
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSSolar radiant energy incident on the plane surface of 10, 7.5 and 5cm thick beds of rough rice intermittently stirred once every hour resulted in drying rates of 0.18, 0.28 and 0.35 percent per hour, respectively. As the bed was made thicker, total hours required for drying down to storage moisture content increased, while there was little difference in hourly drying capacity. When 5cm thick beds were intermittently stirred once every 2, 1 and 0.5 hour, a corresponding increase in drying rate was noted, but the rise in surface temperature and the level of grain crack remained low. Consumptive distribution of solar radiant energy on a fine day was almost constant and no more than 10 to 15% of the total incident radiation was used for evaporation of the moisture in rough rice. On such fine days, lowest values of reflectance (albedo) occurred about noon when the solar elevation angle approached maximum. The daily mean albedo was 0.38.View full abstractDownload PDF (1258K) -
Prediction from Results Measured by Transient Heat Flow Method using ProbeAkio TAGAWA, Satoshi MURATA1995 Volume 57 Issue 4 Pages 27-35
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThermophysical properties of three kinds of beans (azuki, kintoki, tebo) were determined by transient heat flow method using a probe that approximates a line heat source at five different moisture contents (5, 10, 15, 20, 25% (w. b.)) and five temperatures (10, 20, 30, 40, 50°C), respectively. Using the relation on temperature rising versus elapsed time, four parameters were determined by applying a nonlinear least squares method to the approximate solution of the equation on the conduction of heat considering the finite diameter of the heating probe. The measured results of temperature rising versus elapsed time of beans agreed well with the calculated results. Based on the obtained values of four parameters, the nonlinear simultaneous equation formed by two expressions composing these parameters was solved, and the effective thermal conductivity and thermal diffusivity of beans were determind. Using these obtained values and bulk density, the specific heat of beans were estimated.View full abstractDownload PDF (1170K) -
Binarization by Color AnalysisNobuyuki KUSANO, Norihide INOU, Osamu KITANI, Tsuguo OKAMOTO, Toru TOR ...1995 Volume 57 Issue 4 Pages 37-44
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSImage analysis used for an autonomous agricultural vehicle was studied, in which the direction of TV camera toward the crop row was identified from the field images. Principal component analysis and HSI transform were applied to the image binarization. A discriminant analysis method was used to select the threshold value for binarization. In the principal component analysis, the furrow and crop area could be distinguished on a cloudy day. However, on a bright day, the separation between them was not always successful. For HSI transfer, separation was successful on either a bright or a cloudy, and the recognition of the color of the field was easily made.View full abstractDownload PDF (4998K) -
Discrimination Software Applied Neuralnetwork on Rice Field ImagesMasaharu OKADO, Yosiaki NAKAMURA, Minoru YAMAZAKI1995 Volume 57 Issue 4 Pages 45-52
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn this study, an image processing system enabing to measure the color of rice leaves on rice fields was developed and tested. The reduction of the measuring time was expected by the use of this system. In the previous report the correlation between the measured values by chlorophyllmeter and the density value of digital image of a rice leaf was discussed. When this system is used in actual rice fields, it is required to discriminate automatically between rice plants and the others on the image. Then a new image processing software was developed for this purpose. The neualnetwork was applied to it. In this report, the outline of this new software is introduced and the results of discrimination on rice fields images by using it are presented.View full abstractDownload PDF (4881K) -
Satoshi MURATA, Hussein SOROUR, Daisuke IMADA, K. S. P. AMARATUNGA1995 Volume 57 Issue 4 Pages 53-57
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWheat was milled under four subatmospheric pressure levels and one control (1025hPa) at different initial moisture contents to prevent quality reduction by heating and oxidation. Power consumption was measured as a factor of the milling machine, and the moisture content of flour after milling was measured at the different feeding rate of the wheat to determine the capacity of milling machine at the different moisture content of wheat. The results indicated that the temperature of the flour soon after milling could be kept at low level under subatmospheric pressure compared with the control, and the milling power and the moisture content of the flour after milling decreased. The feeding rate of the milling machine was affected by the initial moisture content of the wheat.View full abstractDownload PDF (574K) -
Position Control of Two Wrist JointsMichihisa IIDA, Mikio UMEDA, Kiyoshi NAMIKAWA1995 Volume 57 Issue 4 Pages 59-66
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTo handle heavy materials, we have developed a 5-d. o. f. hydraulic manipulator with two wrist joints controlled by hydraulic proportional valves. Compared with hydraulic servo valve, the proportional valve is simpler and lower in price, but is inferior in the control performance because of its simple construction and the operating delay of the valve. Further, in handling heavy materials, the gravity prevents precise position control. In this study, we designed a position control system to compensate the valve delay and the effect of gravity, and examined the repeated positioning accuracy and the trajectory tracking control. It was found that the system could control the position with the same accuracy as by the servo valve.View full abstractDownload PDF (941K) -
Tsuguhiko FURUKAWA, Ken KAWASAKI, Shigeaki ITOH1995 Volume 57 Issue 4 Pages 67-75
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to reduce the labor for carrying operations on a sloping citrus orchard, the carrying vehicle mounted a winch was developed by way of trial. The vehicle is available for carriage in and out of orchard, and is guided without operator by the drain gutter along the road in the orchard. The steering without operator was good, and carrying efficiency was high.View full abstractDownload PDF (1018K) -
Kouzo KAWASAKI, Hideaki IMURA, Masahiro AIURA, Shigeru ITOH1995 Volume 57 Issue 4 Pages 77-82
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSRushes are usually bundled and immersed in muddy water after harvest, and are stood on the bottom plate of a hot air dryer. Under these conditions, there are two kinds of spaces for hot air passing through. One is the space among the bundles, the other is the inner space among the rushes inside the bundles. It seems that the hot air flow passing through the former space which is called side air flow, cannot play a dominant role in the drying. However, the effects of the side air flow in drying process has not been investigated. We have, therefore, investigated the effects of the side air flow. It is concluded that, 1) Water diffusion coefficients are directly proportional to both the diameter of rush-bundle and the temperature of hot air, 2) Rushes immersed in muddy water have a higher water diffusion coefficients.View full abstractDownload PDF (732K)
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