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Volume 55, Issue 4
Displaying 1-19 of 19 articles from this issue
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M. YAMAZAKI1993 Volume 55 Issue 4 Pages 1-2
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2191K) -
Shape Optimization Analysis for a Chassis FrameKota MOTOBAYASHI, Masayuki KOIKE, Toshio KONAKA1993 Volume 55 Issue 4 Pages 3-11
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe shape optimization procedure using FEM was carried out for the specific purpose of analysis of a tractor chassis frame. To examine any possibility for mass reduction, its applicability was discussed in terms of geometry deformation and stress distribution comparing with the optimized shape and the prototype. Minimization of the mass as an objective function is executed under multiple constrained conditions of nodal displacements and stresses. The optimization progress executions were succeeded in converging into single optimum solution. Although mass reduction and stress alleviation were attained by 40% and 26 to 34% respectively, the geometry of the shape is so complicated for fabrication that the refinement of the geometry is necessary.View full abstractDownload PDF (4538K) -
Measurement of Equivalent Mass of Walking Type Tractor-Implement SystemJunichi TAKEDA, Ryo TORISU, Jun SAKAI1993 Volume 55 Issue 4 Pages 13-21
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper describes the measurement of the coefficient of equivalent mass of a walking type tractor-implement system, and a new identification method for the equivalent moment of inertia. The coefficient was measured by using the disassembly method described in Part 1. The coefficient of the walking type tractor itself was 4.25 and 0.13 for 1st and 6th gear shift respectively, and had the same characteristics as those of a four wheeled tractor-implement system. The new identification method, which is based on the dynamic behavior of the system as a total drive train, is proposed and analyzed.View full abstractDownload PDF (1437K) -
Improvement of Dynamic Characteristics by Active Control Method and Investigation of Control Method for Off-set TrailerNobuki YAMANA, Tomohiro TAKIGAWA, Akira HIRATA1993 Volume 55 Issue 4 Pages 23-31
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSStep response and 90 degree turn tests were performed by using the prototype trailer equipping the active steering control system reported in the previous paper.
In the step response test, when a conventional trailer or a trailer equipping the link type passive control system were used, reply of the angle of traction was slow. Therefore, the rate of the angle change was asymptotic to the desired value. On the other hand, when the active control method was applied, the angle reached desired value much faster. In 90 degree turn test, the difference between trajectory of the tractor and that of the trailer was large in the cases of the conventional trailer and the trailer with link method. Though a small cut-in was observed in the early stage of the turn, tracking error of the trailer equipping the active control system was small.
Theoretical equations describing the active control method for offset trailer were derived.View full abstractDownload PDF (1233K) -
Measurement of Three Component Force Acting on the New PlowShi-xue WANG, Junichi KAMIDE1993 Volume 55 Issue 4 Pages 33-39
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe previous part described the concept and the design principle of the new plow which invert furrow slices at the same position. Experiments in laboratory showed that furrow slices were successfully inverted at the same position with the new plow.
In this part, three component forces acting on the small scaled new plow were measured in the laboratory under various conditions of soil moisture and plowing speed. The specific resistances were in the range of 4 to 7N/cm2. There was little difference between the plows with and without wings.View full abstractDownload PDF (940K) -
Basic Studies on Prevention of Soil Adhesion with Injection DeviceXiu Lun WANG, Masasuke ICHIKAWA, Isao TAJIRI, Akemi NORO1993 Volume 55 Issue 4 Pages 41-46,62
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to find out an effective method to prevent soil adhesion to rotary cover, vibration was considered in this study. A laboratory experimental apparatus was constructed using a steel plate as a model. The vibration characteristics of the plate were analyzed by modal analysis. Silt loam was used for the experiment. Twelve levels of vibration frequency were given to the plate model before the soil in injection nozzle was jetted to the plate at several injection velocities by compressed air. The experimental result showed a remarkable effect on prevention of soil adhesion by the vibration frequency between 60Hz and 100Hz on the centre of the plate model causing large amplitude.View full abstractDownload PDF (2995K) -
Furrow Shape and Planting Posture by Furrow OpenerMasami IWASAKI, Akira ISHIHARA, Kichul KIM1993 Volume 55 Issue 4 Pages 47-54
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe fundamental experiments on the mechanization of planting operation of Baker's garlic bulb on sand dune fields were conducted in order to determine the effect of soil moisture content on the furrow shape formed by furrow opener. The planting postures of the bulbs dropped on the furrow were further-more examined to find the possibility of planting mechanization by natural dropping method of the bulbs during of tillage and furrow operations. The draft force of the furrow openers was also measured under various soil moisture contents.
The furrow shape formed by the furrow opener was the same as the cross sectional shape of the opener when the soil moisture content was more than 3% d. b.. However, the furrow shape formed by a cylindrical seed tube collapsed during the opening operation when the soil moisture content was in the range of 1-6% d. b.. The probability of the suitable planting posture for the seed bulb increased by making a soft seed bed so as to sink easily into the soil when the combination of the furrow opener and the seed tube was adequate. The draft force of the furrow opener increased in direct proportion with the increase of the soil moisture content from 1 to 6% d. b. with the high correlation coefficient of about 0.9.View full abstractDownload PDF (5533K) -
Tomohiro TAKIGAWA, Nobuki YAMANA, Akira HIRATA1993 Volume 55 Issue 4 Pages 55-61
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSNew pickup mechanism for grass harvesters was developed. In the cam mechanism used in a pickup equipment of conventional grass harvester, pressure angle of the mechanism become close to zero which is the change point angle of the mechanism. So the mechanism often becomes uncertain when a worn cam is used. The developed mechanism which is a combination of a planetary gear train and a four-bar linkage is always in stationary configurations. At first, the anlysis model of the mechanism was presented. The experimental pickup equipment was installed on a pickup loader. The pickup equipment functioned properly in grass pickup experiment when the grass mositure was in the range of 16-66%.View full abstractDownload PDF (2897K) -
Development of Tea-Plucking SystemYoshinori GEJIMA, Yoshiichi OKADA, Masateru NAGATA, Katsumi ISHIKAWA1993 Volume 55 Issue 4 Pages 63-73
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAn experimental tea plucking system was developed to use for inducing and plucking experiment.
The experiment for inducing the model of tea stem showed the function that one stem was induced to one plucking hole when the speed ratio s (=v1/v2) was 0.4-1.6. Where, v1 is the plucking hole moving speed in a horizontal plane of projection of plucking rolls rotating at a constant speed, and v2 is the moving speed of tea stem. The indoor plucking experiment indicated that tea leaves were plucked selectively without plucking stems. However, some tea shoots were cut by the crushing action of twin plucking rolls.View full abstractDownload PDF (3893K) -
Toshitaka UCHINO, Masaki MATSUO, Guo-Rong XUE1993 Volume 55 Issue 4 Pages 75-82
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe drying characteristics of radish and shiitake mushroom under corona discharge were evaluated with the object of energy saving and higher quality of drying products.
Under non-heating and non-airblast condition the drying promotion by corona discharge at 8kV was remarkable. The drying rate of radish was about 5 to 7 times as fast as the control. There was little difference of the promotion effect among three kinds of high voltage source in this experiment. The peak of drying rate of radish exposed to corona discharge with air heating and airblast attained to 1.5 times as high as the control, and a low temperature drying with the corona discharge may have higher capability than high temperature drying. In temperature rise test, the time required for drying of shiitake mushroom was about 2 hours shorter than the control.View full abstractDownload PDF (1418K) -
Apparent Falling Rate Drying by ShrinkingSatoshi MURATA, Shoji KOIDE, Kiyoshi MIYAUCHI1993 Volume 55 Issue 4 Pages 83-89
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFor drying high moisture agricultural products, a new drying equation was proposed to account for the apparent falling rate drying phenomenon caused by the shrinkage accompanied with the moisture reduction. The equation was derived by the assumptions of constant drying rate per surface area of products and the reducing area proportional to the 2/3 power of the volume. It was shown theoretically and experimentally that the volume of sliced radish varied as a linear function of moisture contents.
The drying rate of sliced radish were measured under the various conditions of temperature and humidity, and the results agreed well with the calculated values from the equation. Furthermore, various drying method of nitrogen drying, vacuum drying, and solar drying were also carried out for comparing the quality factor of size and color change during drying process. The best result, from the standpoint of the quality, was obtained by vacuum drying.View full abstractDownload PDF (1093K) -
Spectral Reflectance of Peach DefectsXiaoming LI, Toshio IWAO, Tateshi FUJIURA, Sakae SHIBUSAWA, Kentaro MO ...1993 Volume 55 Issue 4 Pages 91-98
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis article describes the spectral reflectance from the surface of sound and defective peaches in order to develope an inspection system to select fruits by machine vision. Fruit-surface reflectances of peaches damaged by compression, puncture, friction, peeling and bruises were compared with sound ones, and then the prediction confidence intervals were confirmed. This made it clear which ranges of wave length should be adopted for the machine vision inspection system.
Measurement over the ranges of 800-940nm and 1140-1400nm infrared rays provided more than 5% differences in spectral reflectance between sound and four kinds of defective peaches, damaged by compression, puncture, peeling and bruises. These infrared regions were valid for detecting such defects.View full abstractDownload PDF (1300K) -
Application of Fuzzy ModelMasayoshi TODA, Osamu KITANI, Tsuguo OKAMOTO, Tohru TORII1993 Volume 55 Issue 4 Pages 99-105
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn this paper, an autonomous vehicle for agricultural robotics is discussed. In order to study untouched sensing system and control system for autonomous vehicles, a protoype vehicle with ultrasonic sensors were developed. For applying fuzzy models to control autonomous vehicles, authors carried out experiments for fuzzy modeling in a simple case. The results obtained in this experiment of this method was recognized.View full abstractDownload PDF (1143K) -
Field Performances of Main SensorsKazuyoshi NONAMI, Minoru KOMATSU, Hideo HIGUCHI, Seiji NAKAO, Ken-ichi ...1993 Volume 55 Issue 4 Pages 107-114
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe development of automatic traveling control system was tried to improve the straight driving of riding-type rice transplanter. An acceleration sensor and an angular velocity sensor were used, and their field performances were discussed. On flat fields, the acceleration sensor detected forward velocity with high accuracy, but on puddled fields errors broke out due to the effect of longitudinal inclination of the machine. Even on puddled fields, angular ranges obtained from the angular velocity sensor agreed with the actual fluctuating velocities in running direction by using a suitable amplifier and a suitable bandpass filter.View full abstractDownload PDF (2718K) -
Fuzzy Control for Nonlinear SystemYi JIANG, Nobuo HONAMI, Shigeo UMEDA1993 Volume 55 Issue 4 Pages 115-122
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA fuzzy control system which adapt to nonlinear characteristics of control system was constituted for the purpose of intelligent control of tractor implement. A designing method of fuzzy controller is proposed by which adaptive adjustment to the nonlinear characteristics of hydraulic driving and also to disturbance is realized easily. This fuzzy controller has original control rules, and the adaptive adjustment for the disturbance is realized simply by shifting the membership function. An adjustment method of the membership function that adapts to the disturbance was acquired by computer simulation. The efficacy of fuzzy control for nonlinear system was also confirmed by comparing with the P control method that was used in Part 1 and 2 under the same nonlinear condition.View full abstractDownload PDF (1305K) -
Optimum Conditions of Chain Pot and Separating DeviceTetsuo NAMBU, Masashi TANIMURA1993 Volume 55 Issue 4 Pages 123-128,136
Published: 1993
Released on J-STAGE: April 30, 2010
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Drop Chute Type Transplanting Mechanism and Soil Flow by Furrow OpenerTetsuo NAMBU, Keiji MIYAMOTO1993 Volume 55 Issue 4 Pages 129-136
Published: 1993
Released on J-STAGE: April 30, 2010
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Toshitaka UCHINO, Masaki MATSUO1993 Volume 55 Issue 4 Pages 137-142,147
Published: 1993
Released on J-STAGE: April 30, 2010
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Ritsuya YAMASHITA, Zuan JIN, Bharata KUNJARA1993 Volume 55 Issue 4 Pages 143-147
Published: 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (786K)
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