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Volume 59, Issue 2
Displaying 1-18 of 18 articles from this issue
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T. ARATA1997 Volume 59 Issue 2 Pages 1-2
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
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Takeshi SHIKANAI, Masami UENO, Koichi HASHIGUCHI, Yukinori NOHSE, Taka ...1997 Volume 59 Issue 2 Pages 3-11
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIt is required to clarify soil deformation under a wheel in order to improve the tractive performance of the off-the-road vehicles, e. g. farm machinery and construction machinery. A new system which is able to measure soil deformation more precisely than the existing methods is developed. A series of photographs for the displacements of the markers which are stuck inside a soil bin wall is taken. The coordinates of the positions of the markers are read from the photographs using the coordinate detecting device. To calculate the strain of soil from the coordinates of the markers, a method used in the finite element analysis is employed. The experiments for the rigid wheel were carried out on sand stratum. The measured strain distribution in the sand is discussed from the mechanical point of view.View full abstractDownload PDF (2867K) -
Hulling Characteristics of Vertical Axis Type HuskerXue-Gang WANG, Nobutaka ITO, Kyoji MIWA, Koji KITO, Xiu-Lun WANG1997 Volume 59 Issue 2 Pages 13-20
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe objective of this study was to analyze the effect of friction and impact on the hulling performance of impeller type husker. In this paper, the characteristics of a horizontal axis type impeller husker was analyzed and used as a basis to propose a vertical axis type impeller husker. Then, the prototype of a compact vertical axis type impeller husker was constructed. Five kinds of hulling hoop were made to analyze the effect of hulling hoop's shapes on hulling performance. The hulling capacities of the vertical and horizontal axis type impeller huskers were compared. Test result showed that the hulling ratio of vertical axis type was higher than horizontal axis type when the rate of intake into the impeller is high.View full abstractDownload PDF (951K) -
Akio TAGAWA, Yoshiki MURAMATSU, Yutaka KITAMURA, Satoshi MURATA1997 Volume 59 Issue 2 Pages 21-27
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe characteristics of water absorption of soybeans were measured at five temperatures ranging from 10°C to 50°C. As for the results, two periods, i. e. the constant rate period and the falling rate period, existed in the water absorption of soybeans, and about 85% (d. b.) was the critical moisture content. When MR versus t were plotted on a semilogarithmic scale in the falling rate period, linear relations were obtained at each temperature. Using the data in the falling rate period, three parameters (B1, K, Me) were determined by applying a nonlinear least squares method to the approximate solution of the diffusion equation and the values of B1 were about 1. As for the results, the measured results of the moisture content changes agreed well with the calculated results. An Arrhenius type equation was used to relate the water absorption rate constant K of soybeans to temperatures, which had a good fit to the measured data. Moreover, the volume changes of soybeans during soaking were determined utilizing measured results of the density on several moisture contents in soaking.View full abstractDownload PDF (798K) -
Performance of Automatic Livestock Walk-through Scales with Entrance GateHideo HOSHIBA, Kazutaka UMETSU, Hidehiko TAKAHATA1997 Volume 59 Issue 2 Pages 29-37
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe performance of automatic livestock walk-through scale with entrance gate was examined. This scale distinguish the cow being weighed from those at the entrance gate. The device performed perfectly under normal conditions, but the scale was sensitive to the electronic interference from milking parlor. Under these conditions, the scale was unable to identify the cows'number of cows. In order to overcome this problem, we set up a switch at the entrance of the parlor and switched off at the entrance gate of the scale. We also set up a reinforced fence and a back stream prevention gate to insure the safety flow of livestock. These adjustments enhanced the performance of the scale.View full abstractDownload PDF (1258K) -
Examination on Ground Wheel of Running Speed SensorSen ZHUANG, Minoru KOMATSU1997 Volume 59 Issue 2 Pages 39-47
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTo improve the feeding accuracy of the automatic feeding control device of fertilizer and Seeder, this study was conducted on ground wheels which forms are related to the detective performance of running speed sensor. The influences of the diameter and the lug of the ground wheels on travel ratio were examined on different conditions of soil water content (d. b.), cone penetration resistance; soil wet density, ground contact pressure and running speed. As a result, the lugless ground wheel with larger diameter had a larger value of travel ratio and a smaller influence of soil conditions in the range of running speeds from 0.2 to 1.2m/s.View full abstractDownload PDF (1021K) -
Detection of the Aimed Rice Plants with Image ProcessingKengo WATANABE, BingQi CHEN, Seishu TOJO, Fusakazu AI, B. K. Huang1997 Volume 59 Issue 2 Pages 49-55
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThere are two methods in installing camera as the computer-eye of the rice transplant robot. One is that a camera is installed at the center in front of the robot. Another is that two cameras are installed at both sides in front of the robot. Filters are attached to the camera lenses to highlight rice plants. The result showed that the rice plants were highlighted with the filter, but the aimed rice plants were not detected perfectly because the noise of the binary image was too large. The detecting, using the optical image of the rice plants filmed on the rice line, was completed with the brightness-division method proposed in this study. With this method, the image could be taken into the computer under the natural light in any weather condition.View full abstractDownload PDF (7168K) -
Binaryzation in Hue-intensity Plane and Detection of Boundary LinesTakahiro KANUMA, Tsuguo OKAMOTO, Toru TORII1997 Volume 59 Issue 2 Pages 57-63
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA process of image analysis was studied to detect a crop area from the field images and to identify the camera position toward the crop row. The images were clearly divided into the crop area and other area by setting the threshold in the hue-intensity plane. To detect the edge pixels in the binary images, a 20×20-pixel sized frame by which the contrast of the edge could be measured irrespective of the slope was used. From the edge pixels known to be on those boundary between the furrow and the crop rows at the right and left sides, two lines were gotten at the proper position.View full abstractDownload PDF (1080K) -
Noriyuki MURAKAMI, Kanji OTSUKA, Keiichi INOUE, Mitsuho SUGIMOTO1997 Volume 59 Issue 2 Pages 65-72
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper describes a high speed color image processing algorithm which has been developed to apply to a robotic cabbage harvester. The developed algorithm is used to recognize the cabbage heads by processing the color image which is taken under unstable lighting conditions in the field. The algorithm uses Neural Network to extract the cabbage heads of HSI transferred image, and estimates the location and the size by calculating the correlation between a binalized image and two templates of model cabbage. Image processing speed is improved by optimizing the algorithm and using parallel processor. As a result of experiment, it could judge 70% of cabbage heads for selective harvest, and it took 8.8s to recognize 11 cabbage heads.View full abstractDownload PDF (1063K) -
Effect of Absorbed Sweat on Transmission of Ultraviolet Rays through FabricsNobuaki KUWABARA, Tsuguo OKAMOTO1997 Volume 59 Issue 2 Pages 73-80
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn this study, the reduction of UV exposure for farmer in agricultural work, is aimed. For the purpose, the effects of absorbed sweat on UV transmission through fabrics were investigated. The results obtained are as follows. 1) The UV transmission through fabrics increased with absorbed sweat. 2) The increase in UV transmission attributed to water which is the chief ingredient of sweat. This is mainly caused by the reduction of the scattering coefficient (S) of UV light by absorbed water, and partly by the decreased in absorption coefficient (α). 3) S and α, which are required to hold down the UV exposure to less than 1 MED (Minimal Erythema Dose), were determined for various fabrics absorbed sweat. The values may give us much help not only for producing of farm working clothes, but also for making the choice of clothes proper to weather.View full abstractDownload PDF (939K) -
Prevention of Working Gas Leakage and the Reduction of Mechanical Friction LossesGUO ZHONG Shou, Tsuguo OKAMOTO, Osamu KITANI, Toru TORII1997 Volume 59 Issue 2 Pages 81-88
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe fundamental technical problems in the development of a Stirling engine are how to prevent the working gas leakage and to reduce the mechanical friction loss. The second prototype Stirling engine with a lapel type cylinder developed in this laboratory was tested to solute the problems. The seal performances and the characteristics of the mechanical friction loss of the lapel type cylinder were experimented under normal and heating conditions. The testing results showed that the gas leakage was prevented and the mechanical friction loss was reduced by using the lapel type cylinder seal. The cycle work of 19 J/Cycle at the gas temperature of 400°C was obtained by operating experiment. The output power performances were improved in comparison with the first Stirling engine reported in the previous paper.View full abstractDownload PDF (2455K) -
Chiyuki TOGASHI, Jun-ichi KAMIDE1997 Volume 59 Issue 2 Pages 89-99
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe particle size of injected deacidified rapeseed oil spray was measured by the immersion method, in which the injected fuel particles were caught on a glass plate coated with two kinds of liquid; one is the mixture of methyl cellulose, methyl alcohol and water (M M W), adjusted in different kinematic viscosity, and other is silicon oil. The effect of the kind of coating liquid and catching time on the particle size was measured. The effect of catching position was also tested using silicon oil for coating. The particle size of theinjected vegetable oil spray, such as refined rapeseed oil spray, was measured on the glass plate coated with silicon oil, and found that the silicon oil coating can be used for vegetable oil test. It was also found that the particle size of deacidified rapeseed oil spray was almost the same as that of other vegetable oils, and smaller than that measured in the past.View full abstractDownload PDF (11438K) -
Measurement by Ultrasonic WavesShun-ichi HATA1997 Volume 59 Issue 2 Pages 101-104
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
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Measurement by Ultrasonic WavesToru TORII1997 Volume 59 Issue 2 Pages 105-108
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
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K. TSUGA1997 Volume 59 Issue 2 Pages 109-110
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
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M. KANAMITSU1997 Volume 59 Issue 2 Pages 111-112
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
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M. MISHIRO1997 Volume 59 Issue 2 Pages 113-114
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
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C. MONDEN1997 Volume 59 Issue 2 Pages 115-116
Published: March 01, 1997
Released on J-STAGE: April 30, 2010
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