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Volume 57, Issue 3
Displaying 1-19 of 19 articles from this issue
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1995 Volume 57 Issue 3 Pages 1
Published: 1995
Released on J-STAGE: April 30, 2010
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1995 Volume 57 Issue 3 Pages 2
Published: 1995
Released on J-STAGE: April 30, 2010
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1995 Volume 57 Issue 3 Pages 3
Published: 1995
Released on J-STAGE: April 30, 2010
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1995 Volume 57 Issue 3 Pages 4
Published: 1995
Released on J-STAGE: April 30, 2010
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M. YAMAZAKI1995 Volume 57 Issue 3 Pages 5-6
Published: 1995
Released on J-STAGE: April 30, 2010
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Nonlinear Three-Dimensional Finite Element Analysis of Water Injection Cutting by a Pan-breakerRui GAO, Ken ARAYA, Satoshi TSUNEMATSU1995 Volume 57 Issue 3 Pages 7-17
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThere are two different design objectives for subsoilers with pressurized fluid injection, for use as pan-breakers and injectors respectively. A large soil failure is desirable when it is used as a pan-breaker and little soil failure is advantageous when it is used as an injector. This paper first analysed the water injection cutting by a pan-breaker with finite element method (FEM). The results showed that with 8.6% d. b. soil moisture, a fracture failure took place. Here, the injected water flow rate should be controlled and limited at the minimum where draught reduction can be obtained, because of long soil rupture distances. With 16.3% d. b. soil moisture, a plastic flow took place and the stresses induced in soil layer by pan-breaker-movement were considerbly small and soil rupture distances were limited. Therefore, panbreaker work should be refrained because of a low breaking efficiency.View full abstractDownload PDF (8769K) -
Effects of Spraying Angle and Soil Moisture Content on Soil AdhesionXiu Lun WANG, Masasuke ICHIKAWA, Nobutaka ITO, Koji KITO1995 Volume 57 Issue 3 Pages 19-27
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe purpose of this study is to find out an effective method for preventing soil sticking to rotary cover by vibration. A laboratory experimental apparatus was constructed using a steel plate as a model. Five grades of moisture content for silt loam soil were considered in the experiments. Test soil was sprayed to the steel plate under two kinds of conditions, with and without vibration, at several spraying angles. Soil spraying velocities were varied by changing the pressure of air compressed. When the plate was not vibrated, the soil sprayed with smaller spraying angles did not stick to the plate. When the plate was vibrated, a remarkable effect was shown in preventing with large vibrational acceleration of the plate.View full abstractDownload PDF (1270K) -
Characteristics in Drying ProcessDonghai HAN, Takemi ABE, Yoshio HIKIDA, Takashi TSURUSAKI1995 Volume 57 Issue 3 Pages 29-36
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe same unit as part 1 was used to carry out drying test on shiitake mushroom with 12kg total weight. Air flow rate of 161kg/h was adopted referring recent drying method, and the drying characteristics when the air flow rate was increased were compared with those when an electric resistance system was adopted. Drying rate in the heat pump system was lower compared to the electric resistance systemm at the same air flow rate, because air temperature was fixed at 40°C in the heat pump system while in the resistance system it increased from 40 to 55°C. However, when the air flow rate in the heat pump system was increased, the drying rate would become higher. It was found that the selection of proper air flow rate is important in the heat pump system, and the timing to stop the drying in this system depends on dehumidifying coefficient.View full abstractDownload PDF (1064K) -
Potato StarchBai-zhen SHEN, Sei-ichi OSHITA, Kazuo HORIBE, Atsushi HASHIMOTO1995 Volume 57 Issue 3 Pages 37-44
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn this study, density of potato starch gel was measured by using gas replacing method. Specific heat of potato starch was measured by using DSC method. Flash method was used to measure the thermal diffusivity of potato starch gel and the effective thermal conductivity was determined. Then, four heat conduction models were examined, and it was indicated that the series model can explain well the heat transfer mechanism in the gel. The intrinsic thermal conductivity of potato starch was estimated by applying the series model to the gel. It was recognized that the intrinsic conductivity depended on mass fraction of water in the gel. This means that the intrinsic thermal conductivities obtained here were apparent values.View full abstractDownload PDF (1059K) -
The Bounce of a Paddy Grain on the Blade and Applicability of the Law of ProportionYoshio NISHIYAMA, Setsutoshi SUGAWARA1995 Volume 57 Issue 3 Pages 45-53
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the report of Part 1, the bounce of a paddy grain on the blade was neglected in the dynamics equation as well as the law of proportion. In this report, rotating coordinates that rotate at the same angular velocity as that of the dehulling fan, were introduced. The two laws of proportion, i. e., with respect to rotational angular velocity and similitude ratio, were proved to be valid not only for the rotating coordinates but also in the bounce equation. Through experiments of a paddy grain falling in a vacuum chamber, the bounce was recognized as a probabilistic phenomenon, but it became evident that the mean values of bounces satisfy the law of proportion and the bounce equation.View full abstractDownload PDF (1146K) -
Traveling Technique Using a Fuzzy Logic ControllerMasayoshi TODA, Osamu KITANI, Tsuguo OKAMOTO, Tohru TORII1995 Volume 57 Issue 3 Pages 55-63
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTo develop autonomous vehicles for use in agriculture, traveling techniques are focused on. In this paper, the straight line trajectory for vehicles is defined, and a fuzzy logic traveling technique along the trajectory is discussed. A fuzzy logic controller is designed to let the experimental vehicle track to a given trajectory and identified by a teaching technique which takes account of human's navigating actions. The performance using this controller is demonstrated and the result is a useful traveling technique for autonomous vehicles.View full abstractDownload PDF (2474K) -
Kazuhiro SERATA, Shingo MIYAMOTO, Tomoo AOYAMA1995 Volume 57 Issue 3 Pages 65-72
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA high-speed wind turbine was made in which multi-blade portion and two-blade portion were attached on the same shaft to get excellent motive power. Based on the value obtained from the separate portion tests, the pitch angle to be used in multi-blade portion was decided to be 17 degrees as the starting performance was the most excellent, and 7 degrees was also employed because of its high output power on the two-stage stack type. Experiments turbine were performed in the combinations of above mentioned angles under the same condition of average wind velocity as the single phase experiment.View full abstractDownload PDF (983K) -
Somsak JONGWATPOL, Masayuki KOIKE, Toshio KONAKA, Akira YODA, Tomohiro ...1995 Volume 57 Issue 3 Pages 73-84
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSUsing the developed mathematical model, approximate stress distribution on moldboard portion could be calculated separately in both tangential and normal directions. The model was investigated by the use of the designed force transducer which measured three components of force simultaneously. Also, thickness of soil slice was investigated empirically. The sum of the theoretical stress was compared with that obtained by actual plowing experiments performed in the laboratory. It was concluded that stress distribution on the moldboard was relatively not sensitive to the change of plowing speed within experimental range. However, for higher speed, the tangential component showed a pronounced increase due to the increase of adhesion.View full abstractDownload PDF (1263K) -
Testing and Evaluation of Manual and Semi-Automatic ShellersThavachai THIVAVARNVONGS, Naoki SAKAI, Osamu KITANI1995 Volume 57 Issue 3 Pages 85-93
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe study on pre-shelling treatment and sizing of cashew nut gave results for a pre-shelling treatment condition of 30min boiling time and 24h drying time as optimum and for an effective sizing method, based on thickness and width parameters, with an average whole-kernel recovery of 82.7% for the sized nuts. Performance testing of six manually operated shellers gave results indicating that the Model AE (KKU) 2 Sheller was the most promising sheller with shelling rate of 0.871kg/h, shelling efficiency of 99.0% and whole-kernel recovery of 79.3%, whereas testing of the semi-automatic Model AE (KKU) SA1 Sheller indicated a compromising optimum nut conveying rate of 40nut/min, correponding to a shelling rate of 3.14kg/h, shelling efficiency of 75.0% and whole-kernel recovery of 80.0%. Economic evaluation of the six manually operated shellers indicated that the Model AE (KKU) 2 Sheller was the most economically attractive sheller, giving the lowest break-even amount and pay back period and the highest net profit of over 1, 000B/yr for amount of nuts thelled 100kg/yr, whereas the semi-automatic sheller was considered attractive only when large amounts of nuts were shelled, giving a net profit, for one specific example, of approximately 17, 000B/yr for amount of nuts shelled 5tons/yr.View full abstractDownload PDF (1021K) -
Tsuguhiko FURUKAWA, Ken KAWASAKI, Shigeaki ITOH1995 Volume 57 Issue 3 Pages 95-102
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTravelling performance on slope (traction, uphill and downhill travelling, turning, parking, braking and the stability against overturning) of a 6-wheel-drive carrying vehicle were investigated, and its adaptability for hillside was discussed. This vehicle has a functional unbalance; that is, the uphill and downhill travelling capacity is superior, but the stability to the rearward overturning on irregular ground and the turning performance on slope are inferior.View full abstractDownload PDF (1003K) -
Masato SUZUKI, Ken KOBAYASHI, Koji INOOKU, Kyoshirou MIURA1995 Volume 57 Issue 3 Pages 103-110
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA function check model, in which the elemental techniques necessary for mechanical grafting were combined, was manufactured, and the possibility of mechanical graftting was examined through cucumber grafting. ‘Cutting-a-Cotyledon-off-Grafting’ as a grafting method, seedling feeding method by hunging on a hanger at the joint of the cotyledons and hypocotyl, urethane rubber finger, cutting by razor and gluing by clip were all performed successfully. Grafting times of 7 seconds per stock was possible. The efficiency of the function check model was as low as 83% for fixing 65% for agglutination and 60% for union. The clip fixing method and improvement in the cutting performance of stock were the remaining problems. As a result of the grafting test, we judged that mechanical grafting is possible.View full abstractDownload PDF (7203K) -
Tray Handling Devices and Evaluation of the Robotic SystemOsamu SAKAUE1995 Volume 57 Issue 3 Pages 111-119
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to develop automated seedling production system, robotic and its devices were applied in greenhouse. In this paper, automation of tray handling operations such as arrangement, movement, loading of trays and evaluation of the robotic system were discussed. For tray handling, the robot arranges the trays on bed continuously, moves the trays to another place for uniform growing, loads the trays into parrett for harvesting or shipping seedlings. Two types of linear head which move vertically and longitudinally were adopted as a main part of this device. For the evaluation of the robotic system, development cost, ability of seedling production, utilization of the robot and future subjects to be improved were discussed. According to the series of research and development, it is the conclusion that the automated operation system for seedling production using robotics technology will be realized in the near future.View full abstractDownload PDF (7868K) -
Tomohiko IRIMAJIRI, Mamoru KUBOTA, Hideo TERAO1995 Volume 57 Issue 3 Pages 121-129
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to recognize the position of a vehicle in a farming envionment using image sensor, it is important to identify a marker on a moving vehicle in the image. The marker is extracted from the image by the difference in the characteristics of the color detected by image processing. The author tried to extract the marker pixels from an image by using chromaticity of pixels which is the ratio of R, G, B in each pixel. The image sensor recognized a marker set at 50m away from a CCD camera with the threshold of one chromaticity, but miss-recognition occurred with some images. Therefore, another method was developed using probability density function (PDF) whose variables are two chromaticities of a pixel. There was no miss-recognition of a marker with this method. and recognition was achieved at intervals of 0.53 second with PDF-table which was used as alternative to calculations by PDF.View full abstractDownload PDF (6501K) -
Kousuke NAGAI1995 Volume 57 Issue 3 Pages 131-135
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (4362K)
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