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Volume 55, Issue 6
Displaying 1-19 of 19 articles from this issue
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S. UMEDA1993 Volume 55 Issue 6 Pages 1-2
Published: 1993
Released on J-STAGE: April 30, 2010
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Nonlinear Three-Dimensional Finite Element Analysis of Air Injection CuttingRui GAO, Ken ARAYA, Hideo TERAO, Satoshi TSUNEMATSU1993 Volume 55 Issue 6 Pages 3-12
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 soil failure is advantageous when it is used as an injector. This report analyzed theoretically soil failure by pan-breaker or injector with air injection by a finite element method (FEM).
The results showed that it was impossible that a new tensile stress zone, with which traction power could be decreased, was produced in soil layer by air injection. However, disturbance energy increased by air injection both in pan-breaker and injector. This is due to the fact that forward rupturedistance, maximum vertical soil movement at the soil surface and the number of slip surfaces increased and there was a considerable soil disturbance by air injection.View full abstractDownload PDF (10227K) -
Analysis of Friction Factor in Cutting ActionYoshinori GEJIMA, Yoshiichi OKADA, Masateru NAGATA, Katsumi ISHIKAWA1993 Volume 55 Issue 6 Pages 13-21
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe plucking roll system was designed to solve the cutting problem of tea shoots, and the theoretical analysis of the friction factor was made to investigate the main cause in these factors. The friction coefficient between the material of plucking roll and tea stem was 0.58-0.68, which was obtained by using the experimental apparatus based on the pin-disk method. The maximum diameter of plucking roll which will protect the tea stem from cutting was assumed to be about 10mm.View full abstractDownload PDF (1305K) -
Prototype Separation SystemYu NIU, Shun-ichi HATA, Satoru NAMBU, Munehiro TAKAI, Tadakatsu KOBAYA ...1993 Volume 55 Issue 6 Pages 23-31
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA new grain-straw separation system which could alternate a coventional straw walker was developed. In this paper, the prototype separation system was introduced, and the feasibility of this system was discussed. The developed separation system has 1.3m of separation length, and a screen-conveyer which conveys mixture of grains and straws. During the conveyance, grains are separated from mixture by blown up air and drop through the screen-conveyer into sampling box. The straws are conveyed out by the screen conveyer. The grain separation rate of this system was up to 90% at the conveyer speed of 0.7m/s and straw feed per conveyer surface area of 2.25kg/m2. This system will be adaptable to the grain separation system of combine.View full abstractDownload PDF (1530K) -
Cost Evaluation and a Computation Model for Drying-ChargesYasuhiko SAWADA, Kazuo HORIBE, Takaharu KAMEOKA1993 Volume 55 Issue 6 Pages 33-41
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to determine a cost evaluation method applicable to investment in plant-equipments and management in grain drying facilities, the authors made the efficiency analysis at some practical grain drying facilities applying the pay-back period method and the rate of return method. Based on this, a computation model was proposed to be able to calculate appropriate drying-charges. Experimental drying-charges induced from a simulation upon this computation model were compared with the charges actually applied at 43 drying facilities, and some discussions were made. The results made it clear that the acutual drying-charges could compensate in average only 61 percent of the charges to meet the drying facilities management. However, in some facilities performing high operation rate the running cost became lower enough to withdraw the capital invested.View full abstractDownload PDF (1463K) -
Relationship between Quality of Watermelon and Damping Coefficient of Vibrational WaveJie Yu CHEN, Mitsuru MIYAZATO, Etsuji ISHIGURO1993 Volume 55 Issue 6 Pages 43-48
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAn easy nondestructive discrimination method for detecting internal quality of watermelon, especially maturity, was proposed. Damping coefficients of vibrational waves were obtained by considering the watermelon as a simple viscoelastic system of spring and damping, supporting a concentrated mass and correlated with observed sensed values. The relationship between damping coefficients and hitting power, stored temperature and stored time were investigated, and basic data were obtained for sorting, packing, handling and storing watermelons.View full abstractDownload PDF (915K) -
Experimental Equipment No. 2 and Plant FactoryKazuo HORIBE, Kunio MORI, Kohzoh MATSUO, Kohichi KONDOH, Takaharu KAME ...1993 Volume 55 Issue 6 Pages 49-57
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSCultivating experiments on the plant transfer equipment developed in this study were conducted, and it was found that stabled cultivations would be nearly possible, but some problems were made clear. To solve these problems and cut the production costs, the plant transfer equipment was improved. The improved points are: power and driving method, carriers, frame, cultivating bed and root intervals. Futhermore, in order to find out cultivating problems which appear in the long working terms, a practical plant was made which could control cultivating conditions completely.View full abstractDownload PDF (3051K) -
Construction of Measurement SystemKatsuyuki OTA, Hideo TERAO, Noboru NOGUCHI, Tomohiko IRIMAJIRI, Mamoru ...1993 Volume 55 Issue 6 Pages 59-67
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe purpose of this study is to develop a location method for driverless tractor. The principle of measuring location is triangulation using two image sensors set at the corners of a field. A tractor equipped with a target marker was recognized by CCD camera as an image. The CCD camera rotates with a motor to pursue the movement of the target marker. This paper presents the construction of a sensor module which consists of a CCD camera, step motor and potentiometer. An experiment was performed to estimate the accuracy of the system, and the angle and location of the target marker under indoor environment were measured. The result shows that in region of 20m width and 14m length, the error of measurement is less than 8.4cm. A target pursuit system was tested, and it was judged from the data that the pursuit control system provided acceptable performance.View full abstractDownload PDF (1504K) -
Recognition of the Course Marker by Neural NetworksMasahiko KANEKO, Kazuhiko KURATA, Kazuhiro NAKANO1993 Volume 55 Issue 6 Pages 69-76
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe purpose of this study is the development of the control systems of agricultural autonomous vehicles which run in a green house without a course marker. The understanding of environment, which had been an important problem in realizing the autonomous control, was discussed in this report. In many kinds of environmental information, the images include most information. The neural networks were applied to extract a course marker from a video image, and the recognition systems for general purpose environment were developed.View full abstractDownload PDF (3459K) -
Outline of Robot and its Application to Weed Control in Hill SpaceMakoto DOHI, Tateshi FUJIURA, Seiji NAKAO, Toshio IWAO, Minoru KOMATSU1993 Volume 55 Issue 6 Pages 77-84
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe objective of this research was to develop a multi-purpose intelligent robot for the vegetable production. Many of the vegetable producing operations are presently done by hand, because they need to be done selectively. The robot consisted mainly of a rectangular manipulator, a traveling device and a computer. In this report the outline of the robot and its application to the weed control in the hill space are reported. The weed location was measured by processing color images, and the weed was removed by a trial-made blade.
Weed detection by a three-dimensional range sensor was also experimented. As the result of this research, it was clarified that the three-dimensional location of the weed could be accurately measured and this robot could control the weed.View full abstractDownload PDF (5540K) -
Manipulator and Harvesting HandNaoshi KONDO, Yasunori SHIBANO, Kentaro MOHRI, Mitsuji MONTA, Seiichi ...1993 Volume 55 Issue 6 Pages 85-94
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSGrapevine is planted in trellis training in Japan. It is considered that this training has much adaptability for robot working than other trainings. In this paper, it is reported that a manipulator with 5 degrees of freedom and a harvesting hand were made as a trial based on the measurement of positions of grape bunches, frictional resistance and cutting resistance of rachis. The manipulator was a polar coordinate type and its end was controlled to move in continuous path. The hand had three functions; grasping rachis, cutting rachis and pushing bunch. The experiment to harvest individual bunches showed that the manipulator and the hand were effective for harvesting.View full abstractDownload PDF (3225K) -
Kunio NISHIZAKI, Kouji INOOKU1993 Volume 55 Issue 6 Pages 95-103
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIt has been necessary to establish the evaluation technology on the reliability of agricultural tractors, and a Field Simulation System to evaluate the durability of agricultural tractors was developed. It consists of a load simulation system for PTO (power take-off) shaft and a road-load simulation system. Experimental studies on the PTO load simulation system proved the possibility of laboratory simulation by using actual load data. The system includes the analysis of torque and revolution frequency and the modification (editing) of load pattern (actual data). Experimental studies on the road-load simulation proved that, with the utilization of the “remote parameter control” method, it is possible to obtain excellent results when working with servo-hydraulic test system. Some factors affecting the simulation processes, which are different by tractors, are also shown.View full abstractDownload PDF (1496K) -
Identification of Autoregressive ModelsToru TORII, Tuguo OKAMOTO, Osamu KITANI1993 Volume 55 Issue 6 Pages 105-112
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSControl of water status of a plant is important for control of crops. In this report, cross correlation of water potential with vapor transpiration and diameter variation were discussed. Autoregressive models were assumed for the plant's response models, and parameters were identified from the plant's responses to randomly varying light intensity. In the simulation, step responses were calculated, and the results showed that the transpiration response corresponded to the model. Autoregressive spectral analysis was also done, and the result showed it was more precise than spectral analysis by FFT method. Identification of autoregressive models showed good results for evaluation of control models and estimation of spectral characteristics.View full abstractDownload PDF (1213K) -
Development of Transplanter and Actual Proof TestTetsuo NAMBU, Akiyoshi MASUDA, Masashi TANIMURA1993 Volume 55 Issue 6 Pages 113-120
Published: 1993
Released on J-STAGE: April 30, 2010
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Tractor Attached Type Experimental HarvesterMikio KANAMITSU, Kenji YAMAMOTO, Yasunori SHIBANO, Mitsuo SUZUKI1993 Volume 55 Issue 6 Pages 121-128
Published: 1993
Released on J-STAGE: April 30, 2010
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Takashi AKIYAMA, Ritsuya YAMASHITA1993 Volume 55 Issue 6 Pages 129-134
Published: 1993
Released on J-STAGE: April 30, 2010
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Processing Characteristic of WheatKatsumi ISHIKAWA1993 Volume 55 Issue 6 Pages 135-138
Published: 1993
Released on J-STAGE: April 30, 2010
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Shuso KAWAMURA, Koichi YOSHIMACHI, Kazuhiko ITOH1993 Volume 55 Issue 6 Pages 139-143
Published: 1993
Released on J-STAGE: April 30, 2010
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Nobuo TAKAHASHI1993 Volume 55 Issue 6 Pages 145-149
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2263K)
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