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Volume 62, Issue 4
Displaying 1-15 of 15 articles from this issue
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T. SUTO2000 Volume 62 Issue 4 Pages 1-2
Published: July 01, 2000
Released on J-STAGE: April 30, 2010
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HokkaidoNobuhito MURAI2000 Volume 62 Issue 4 Pages 4-12
Published: July 01, 2000
Released on J-STAGE: April 30, 2010
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T. SUGIYAMA2000 Volume 62 Issue 4 Pages 13-15
Published: July 01, 2000
Released on J-STAGE: April 30, 2010
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Kenshi SAKAI, Akira SASAO, Sakae SHIBUSAWA, Attila BUKTA2000 Volume 62 Issue 4 Pages 63-70
Published: July 01, 2000
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSBouncing tractors have been shown to be a potentially chaotic system by the author's previous theoretical study. The conducted numerical experiments predicted nonlinear vibrations such as periodic, period-doubling, quasi-periodic and chaotic vibrations. In this paper, the dynamics of a bouncing tractor were investigated experimentally and the results predicted in the previous study were validated. In addition, a bifurcation structure of the dynamical system of the bouncing tractor were clarified experimentally, and nonlinear resonance was observed in this experiment.View full abstractDownload PDF (905K) -
Koichi HASHIGUCHI, Seiichiro TSUTSUMI, Takashi OKAYASU, Koshiro SAITOH2000 Volume 62 Issue 4 Pages 71-80
Published: July 01, 2000
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIt is required to take account of the plastic instability phenomenon with the bifurcation and the localization of deformation for the analysis of the large deformation process, aiming at the development of mechanical design of agricultural machinery and other machinery or structures. The elastoplastic constitutive equation of soils extended so as to describe the finite deformation under the general loading process with the cyclic loading and the abrupt variation of loading path is proposed in the previous article. Based on it, the formation condition of shear band under undrained plane strain condition is analyzed.View full abstractDownload PDF (3911K) -
Choung Keun LEE, Michihisa IIDA, Toshikazu KAHO, Mikio UMEDA2000 Volume 62 Issue 4 Pages 81-88
Published: July 01, 2000
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to measure the spatial variability of grain yield, an impact type yield sensor has been developed for head feeding combine. The sensor consists of two cantilevers. One of them measures grain impact and the other measures background noise. The coefficient of determination between measured value and grain yield is 0.91 at indoor test. The sensor was installed on the head feeding combine with RTK-DGPS. The coefficient of determination is 0.58 at a paddy field test.View full abstractDownload PDF (6620K) -
Tieyou DONG, Toshinori KIMURA, Shigeru YOSHIZAKI, Chuanping FENG, Yosh ...2000 Volume 62 Issue 4 Pages 89-101
Published: July 01, 2000
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSExperimental study on microwave drying of thick layer rough rice with concurrent, counter and cross flow ventilation was carried out and the appropriate conditions for microwave drying of thick layer rough rice with concurrent flow ventilation are discussed. The experimental data showed that during the microwave drying process, ventilation could prevent overheating and the ventilation air flowing direction was important to obtain uniform drying and favorable product quality. Concurrent flow ventilation was the most favorable means to obtain uniform drying. Air velocity significantly affected the drying rate and uniformity. Ventilation air acted as a moisture carrier and an energy conveyer in microwave drying of thick layer rough rice with concurrent flow ventilation. The most appropriate conditions for microwave drying of thick layer rough rice with concurrent flow ventilation are when microwave power is below 0.10W/g, air velocity is about 0.07-0.12m/s and the thickness of grain layer is about 100-120mm.View full abstractDownload PDF (4110K) -
Yelian MIAO, Kazuo HORIBE, Akinori NOGUCHI2000 Volume 62 Issue 4 Pages 102-108
Published: July 01, 2000
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSEffects of moisture content and salt content on heating rate in ohmic heating of rice paste were investigated. The rice paste was filled up in an insulated container. Electrical properties of the rice paste were examined for analyzing of heat generation.
Experimental results showed that the rice paste had an approximately uniform temperature, and the higher the temperature was, the faster it rose during ohmic heating. The maximum average heating rate was obtained in the moisture content range of 50 to 67%. The average heating rate varied linearly with the salt content. It was clarified that the rice paste could be considered as an equivalent circuit of a resistance, and the calculated temperatures agreed with the experimental data.View full abstractDownload PDF (2770K) -
Fumihiko TANAKA, P. MALLIKARJUNAN, C. KIM, Y.-C. HUNG2000 Volume 62 Issue 4 Pages 109-119
Published: July 01, 2000
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe effect of different concentrations (0, 0.5 and 1%) of NaCl solution for marinating on the dielectric properties of marinated chicken breast meat was investigated at frequencies between 0.3 and 3GHz from 3 to 75°C. Dielectric constant decreased with increased frequency and temperature. At the low temperatures (3, 18 and 35°C), loss factor decreased with increasing frequency up to 2GHz, and then increased slowly. At the high temperatures (50 and 75°C), dielectric loss factor decreased with increasing frequency. Loss factor also increased with increasing salt content. The relationship between dielectric properties and temperature was determined at 915 and 2450MHz. The penetration depth depended on sample temperature and salt content of sample. The penetration depth decreased with temperature at 915MHz. For that at 2450MHz, it increased with temperature, reached a broad maximum point, and then decreased with temperature. Microwave bumping, which is caused by a rapid expansion of food particulate, was investigated at the frequency of 2450MHz. The degree of microwave bumping increased with salt content of sample.View full abstractDownload PDF (2789K) -
Fumihiko TANAKA, Yoshiharu MAEDA, Kazuo MORITA2000 Volume 62 Issue 4 Pages 120-126
Published: July 01, 2000
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe quality of agricultural products is greatly influenced by freezing rate and temperature history during freezing process, because biological cells are injured by osmotic stress due to phase change of inner solution. A three-dimensional heat transfer model with appropriate boundary conditions is required to gain a better understanding of food freezing process. Heat transfer model was developed to predict the changes of temperature distribution during freezing process. This model is including temperature effect on thermal properties. The non-liner model was solved by using the control volume method. In order to verify this model, freezing tests were carried out using diced radish and diced carrot. Predicted freezing curves in both samples well agreed with observed results. It was concluded that the developed model was useful for freezing time and freezing rate predictions.View full abstractDownload PDF (3683K) -
Sensing of Tea Leaf State on Hot Air DryingHitoshi YOSHITOMI, Fujio NAKANO, Shinzo TANAKA, Osamu SUMIKAWA2000 Volume 62 Issue 4 Pages 127-136
Published: July 01, 2000
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to develop the automatic control system for tea manufacturing processes using of a computer, some methods to detect the tea states which are necessary for controlling the processes were examined. The system to develop is based on the multi-input and multi-output feedback system which detects the tea states such as temperature, moisture content, and dampness, and controls the processing conditions such as supplied air temperature, air quantity, rolling pressure, the number of revolution of main shaft, etc. according to those. This paper described the sensing of tea states in the tea manufacturing processes where hot air dryers are used, and discussed the measurement methods of tea leaf temperature, moisture content, and dampness which was defined for adapting to control.View full abstractDownload PDF (1442K) -
Desrial, Nobutaka ITO2000 Volume 62 Issue 4 Pages 137-145
Published: July 01, 2000
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the previous paper it was revealed that turning motion resistance could be reduced by the induction of circular grouser pattern track model. For practical investigation of circular grouser pattern, a prototype of the circular grouser pattern rubber track was constructed successfully and its performance was evaluated. It has been found that on sandy loam, the use of circular grouser pattern rubber track in the combination of controlled pivot turn could reduce turning motion resistance remarkably, compared to the existing straight grouser pattern rubber track with conventional pivot turn. In addition, soil disturbance under the braked track was also reduced. Circular grouser pattern rubber track, however, performed a minor reduction in the tractive performance in comparison to the straight grouser pattern.View full abstractDownload PDF (4904K) -
Akira MIZUSHIMA, Noboru NOGUCHI, Kazunobu ISHII, Hideo TERAO2000 Volume 62 Issue 4 Pages 146-153
Published: July 01, 2000
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA GPS is widely used as a positioning system for an automatic vehicle guidance. But, generally a GPS antenna is installed at the top of a vehicle whose height is 2 to 3 meters from the ground, a position error raised from vehicle inclinations (roll and pitch) is included. In this research, to increase travel accuracy of vehicle guidance, we propose the correction method of the position error caused by vehicle inclinations. To evaluate a performance of the developed correction method, the travel test by giving roll and pitch was conducted. The average of lateral error indicated about 17.1cm, when the vehicle traveled without inclination correction, while the average error was reduced up to about 2.1cm by introducing the inclination correction. In addition, to investigate the performance under higher velocity, the traveling test in which running speed exceeding 4.0m/s was also carried out. Without the inclination correction, the R. M. S. error in the lateral direction of the vehicle reached 10.4cm. On the other hand, when the developed correction method was utilized, the R. M. S. error decreased to about 3.8cm. It was concluded that the performance of the developed guidance system on high speed travel was satisfied with actual field managements.View full abstractDownload PDF (2675K) -
Moisture, Protein and Ash Content of BuckwheatMotoyasu NATSUGA, Shuso KAWAMURA, Kazuhiko ITOH2000 Volume 62 Issue 4 Pages 154-159
Published: July 01, 2000
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFollowing by wheat, rice and soybean, the accuracy of calibrations when using near-infrared reflectance spectroscopy to determine the content of major constituents of buckwheat, such as moisture, protein and ash was investigated. Samples of buckwheat harvested in Hokkaido, Canada and China were used. Good results were obtained for moisture, protein and ash content.View full abstractDownload PDF (676K) -
Daniel Leslie S. TAN, Keiji MIYAMOTO, Ken-ichi ISHIBASHI, Kiyoaki MATS ...2000 Volume 62 Issue 4 Pages 160-172
Published: July 01, 2000
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSVillage level root crop processing system in the Philippines was evaluated using sweetpotato (cv. Kogane sengan and Shiro satsuma) as materials. The PRCRTC chipper/grater had more pronounced power fluctuation in grating than in chipping and peaking during the loading of the roots. The grinder had the highest energy requirement than the other machines, but the power fluctuation was relatively stable regardless of the amount of materials loaded. The finisher had a stable power fluctuation, and its power increased as either the loading rate or rpm was increased. Size and weight of chips and fineness modulus of grates were affected by the rpm of the blades. Percent recoveries of dried chips, fine flour and dried grates for Kogane sengan, at 12% moisture content, were 33.3%, 21.4%, and 30.4%, respectively.View full abstractDownload PDF (6630K)
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