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Volume 55, Issue 5
Displaying 1-20 of 20 articles from this issue
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M. KARAHASHI1993 Volume 55 Issue 5 Pages 1-2
Published: 1993
Released on J-STAGE: April 30, 2010
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Eiji INOUE, Jun KASHIMA, Jun SAKAI, Osamu IDE1993 Volume 55 Issue 5 Pages 3-10,27
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe vibration of agricultural machines which are fitted with rubber crawlers is caused by the unevenness of ground, attached devices and other factors such as the arrangement of track rollers and the lug phase of right and left side rubber crawlers. To grasp the vibration characteristics of the rubber crawler system, it is necessary to measure the translational and rotational acceleration at the center of gravity. The measurement method using 9 units of accelerometers was previously reported. In this paper, the expanded method of measurement using 12 units of accelerometers and its advantages are reported. The acceleration of the rubber crawler system was measured by the new method, and the acceleration characteristics due to the arrangement of track rollers as well as the lug phases were clarified.View full abstractDownload PDF (1080K) -
Keiji WATANABE, Masanori KITANO, Hachiro IKENOMOTO1993 Volume 55 Issue 5 Pages 11-18
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the previous papers the authors already have developed a mathematical model of steerability of tracked vehicles on a level ground, and have experimentally verified the validity of the model. It was disclosed from these analysis that the tracked vehicles have peculiar steering characteristics such as over steering and response delay at high speed.
This paper describes the theoretical and experimental analysis of the steering performance of tracked vehicles with wide tracks on an inclined ground. Theoretical results of trajectories and required tractive forces considerably coincide with the experimental results of the scale model. As the results, it is confirmed that the controllability and the stability of the tracked vehicle are significantly effected on inclined ground.View full abstractDownload PDF (2719K) -
Soil Failure Rate in Relation to Flow Rate of Injected WaterKen ARAYA, Satoshi TSUNEMATSU1993 Volume 55 Issue 5 Pages 19-27
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe optimum model shapes of pan-breakers and injectors with pressurized fluid injection were determined by a basic soil bin test injecting air in the previous report. At this test, the characteristics of soil failure was changed by soil moisture, ie. collapse failure, fracture failure and plastic flow. The maximum rupture distances were obtained when the fracture failure took place. This report deals with the characteristics of soil failure by water injection. Liquid such as water saturates the soil around a nozzle port and the rupture distances on soil surface would be changed.
The results showed that with pan-breakers and under the soil moisture with fracture failure, both rupture distances and disturbance energy decreased to about 50% by increasing water flow rate from 0 to 0.45kg/s. With injectors, rupture distances decreased to about 50% but disturbance energy was constant regardless of water flow rate.View full abstractDownload PDF (9142K) -
A Nonlinear Three-Dimensional Finite Element Analysis of Subsoiler CuttingRui GAO, Ken ARAYA, Hideo TERAO, Satoshi TSUNEMATSU1993 Volume 55 Issue 5 Pages 29-39
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThere are two design objectives for subsoilers with pressurized fluid injection for use as pan-breaker or injector; a large soil failure rate is desirable when it is used as a pan-breaker and little failure is advantageous when it is used as an injector. This report analyzed the relation between soil failure rates and the shapes of shanks and chisels without fluid injection by a finite element method (FEM).
The result showed that rake angle gave a considerable effect on rupture distances. When the rake angle was small, 45-60°, plastic yield zone and tensile stress zone expanded, and there was considerable soil deformation and disturbance. Consequently, a design principle determined by soil bin test, where the optimum pan-breaker should have a rake angle of 45-60° and the optimum injector should have a rake angle of 90°, was theoretically reasonable.View full abstractDownload PDF (8827K) -
Trial Construction of Tea-Plucking MachineYoshinori GEJIMA, Yoshiichi OKADA, Masateru NAGATA, Katsumi ISHIKAWA1993 Volume 55 Issue 5 Pages 41-49
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA plucking roll type machine was assembled for field experiment to obtain the state of plucked tea leaves.
The rate of injured tea leaves were 30-50% for the first crop of long tea shoots and 50-80% for the 3rd crop of short tea shoots, respectively. The injured leaves reduced the quality of plucked tea leaves, and the injury of leaves occurred from the selective plucking of the test model. As the results of quality test, the tea leaves plucked with the plucking roll type machine showed equal or better quality comparing the ones with shearing tool or commercial cutting type machine, because of the reduction of hard and woody parts of tea stems through the effect of selective plucking.View full abstractDownload PDF (3461K) -
Yoshio HIKIDA, Takemi ABE, C. E. OFOCHE1993 Volume 55 Issue 5 Pages 51-57
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper deals with fat acidity development in rice grain whose respiration and germination functions were disordered as a result of heating operation, and the effect of heating on fatty acid development was investigated. Fat acidity value increased as storage progressed, but the rate of increase was suppressed for the heated samples. The higher the heating temperature level was and the longer the heating time was, the smaller the fat acidity value became. This could be attributed to decline in generation of free fatty acids due to the inactivation of lipid decomposing enzyme as a result of heating. On the other hand, fat acidity development was more effectively suppressed for rough rice storage than for brown rice storage.View full abstractDownload PDF (1044K) -
Investigation on the Dependence of Effective Thermal Conductivity on Volumetric Water Content and Temperature by Simulation ModelKazunori IWABUCHI, Jun-ichi KAMIDE, Toshinori KIMURA1993 Volume 55 Issue 5 Pages 59-66
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper describes the dependence of the effective thermal conductivity of dairy cattle solid waste (composting material) on volumetric water content and temperature. The effective thermal conductivity was measured by the thermal probe method. The results show that the effective thermal conductivity has an almost linear relationship with the volumetric water content when latent heat flux in dairy cattle solid waste is ignored. The temperature has much effect on the effective thermal conductivity in large gas filled porosity. A modified simulation model, taking into account the latent heat flux, agrees closely with measured data.View full abstractDownload PDF (1350K) -
Development of Evaluation System of ANC and its PerformanceTomokazu YOSHIDA, Fumitake ISHIKAWA1993 Volume 55 Issue 5 Pages 67-74
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSActive noise control (ANC), that is one of active control methods to reduce the noise using the interference of sound, is applied to suppress the noise around the operator of agricultural machinery.
In this paper. an evaluation system of ANC was developed with one reference input, two control outputs, and one error input. ‘Filtered-X LMS (Least mean square)’ algorithm was applied to this system to carry out the noise reduction. The performance of evaluation system to reduce the noise was confirmed by the experiment with two tractors. The amount of noise reduction was about 10dB at the control point (i. e. at the error microphone). The area of more than 6dB reduction was as large as 25×25cm or larger than that in the surface containing the error microphone and secondary source.View full abstractDownload PDF (1395K) -
Correlation between Chlorophyll Content of Rice Leaves and Result of Image ProcessingMasaharu OKADO, Yoshiaki NAKAMURA1993 Volume 55 Issue 5 Pages 75-81
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe purpose of this study is to develop a system which can measure the state of rice nourishment in two dimensional distribution on actual rice fields. Image processing was applied to this system and used to measure the color of rice leaves. The images from the height of man's eyes were taken by a video camera and processed for the purpose of actual use by farmers.
In this report, the correlation between chlorophyll content of the rice leaves and the result of image processing was examined. As the result of this experiment, it was found that the chlorophyll content of rice leaves correlated with density values of Red and Green, and intensity value Y.View full abstractDownload PDF (7086K) -
Kinematic Model of Vehicle by Neural NetworksNoboru NOGUCHI, Kazunobu ISHII, Hideo TERAO1993 Volume 55 Issue 5 Pages 83-92
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe object of this study is to control agricultural vehicle utilizing neural network system (NNS) through nonlinear controller. Kinematics of the vehicle was described as the emulator, that was nonlinear dynamic model, by NNS, and its accuracy was investigated using the training data. The generalization of the emulator for the vehicle was also confirmed by the movement patterns which were not the training data. It was made clear that the output of NNS were in good agreement with the experimental data, and were correcter than the output of the physical model neglecting slip angle. Furthermore, the simpler movements such as lane change and meandering motion were carried out to evaluate the ability of the emulator.View full abstractDownload PDF (1536K) -
Intelligent Cotrol for Tractor ImplementYi JIANG, Nobuo HONAMI, Shigeo UMEDA1993 Volume 55 Issue 5 Pages 93-101
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAn intelligent control system for the tractor implement has been constituted on the basis of the fuzzy control system reported in the Part 3, with the addition of an on-line learning adaptive mechanism, an experience learning adaptive mechanism, and an adaptive mechanism for tilling reaction force. The on-line learning adaptive mechanism adjust the fuzzy controller depending on the transient response; the adaptive mechanism for tilling reaction force is constituted for the purpose of improving the response of driving down the implement; and the experience learning adaptive mechanism can adapt to the variety of tilling environment quickly by utilizing the past experience. Through the experiments, the capability of adaptation to the variety of tilling environment of this system was confirmed by obtaining the response of each adaptive mechanism under the actual tilling condition. The special characteristics and the practical application of this system have also been investigated.View full abstractDownload PDF (1607K) -
Tsuguo OKAMOTO, Osamu KITANI, Tohru TORII1993 Volume 55 Issue 5 Pages 103-110
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSMericlone culture of orchid plants is in vitro technique where all operations must be done in the sterile environment of the transfer hood. A robot system for transplanting orchid protocorms in seed propagation was studied and developed to reduce labor requirements and prevent contamination in plant tissue culture. A machine vision was used for recognition of protocorms that were about 0.5mm in diameter and randomly dotted on agar growth media. A small and light gripper driven by shape memory alloy actuator was able to handle softly the microscopic objects in delicate operation for transplanting protocorms. The intelligent robot system has a machine vision and micro-handling technique and could carryout transplanting more efficient than technician.View full abstractDownload PDF (5907K) -
Sakae SHIBUSAWA, Takuo KOKURYU, Toshio IWAO, Tateshi FUJIURA1993 Volume 55 Issue 5 Pages 111-118
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper describes the effect of soil density variation on the formation of root system of corn in root boxes of transparent acrylic resin, and also discusses the influence of distribution of soil density and roots growth on soil moisture dessipation. A view point of developmental soil-plant complex system specializes the work. Varying soil density distribution resulted mixing patterns of root system which were formed by homogeneous high and low densities of soil. The distribution of root followed power low scaling. The dissipated water mass in the root box might be related to the root area in the zone of low density of soil but other parameters of plant growth such as height of plant, mass of roots. The root growth affected decreases of soil hardness.View full abstractDownload PDF (4326K) -
Measurement of Coefficient of Kinetic Friction on Drop ChuteTetsuo NAMBU1993 Volume 55 Issue 5 Pages 119-123
Published: 1993
Released on J-STAGE: April 30, 2010
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Planting Test by Drop Chute Transplanting MechanismTetsuo NAMBU, Keiji MIYAMOTO, Kiyoaki MATSUDA1993 Volume 55 Issue 5 Pages 125-132
Published: 1993
Released on J-STAGE: April 30, 2010
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Fundamental Research and Development of Harvesting MechanismMikio KANAMITSU, Kenji YAMAMOTO, Yasunori SHIBANO, Yoshiaki GOTO, Mits ...1993 Volume 55 Issue 5 Pages 133-140
Published: 1993
Released on J-STAGE: April 30, 2010
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Satoshi MURATA, Fumihiko TANAKA, Junichi TOKUNAGA1993 Volume 55 Issue 5 Pages 141-145
Published: 1993
Released on J-STAGE: April 30, 2010
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On the Plowing Width SensorMinoru KOMATSU, Kazuyoshi NONAMI1993 Volume 55 Issue 5 Pages 147-149
Published: 1993
Released on J-STAGE: April 30, 2010
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Mitsuo SUZUKI, Atsushi SAWAMURA, Tsuguhiko FURUKAWA, Motomu KARAHASHI1993 Volume 55 Issue 5 Pages 151-153
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (544K)
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