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Y. OTA
1998 Volume 60 Issue 4 Pages
1-2
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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Soil Mixing Model Based on Particle Kinetics Model for Tilled Soil Throwing
Kazuhiro ONODERA, Takashi KATAOKA, Yoshinobu OTA, Tatsuo HIROMA
1998 Volume 60 Issue 4 Pages
3-11
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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The objective of this study is to clarify the relationships between soil mixing characteristics and effective configurations of rotary blade using the reverse-rotational rotary tiller for deep tillage. The soil mixing characteristics is one of the important factors for crop cultivation. This paper proposes a new soil mixing model based on the particle kinetics model for tilled soil backward throwing. This model includes the clod size and the duration of tilled soil flight as parameters. The simulated result shows that the soil mixing characteristics are related to the rotary blade configuration, the soil cutting angle (φ
1) and the central angle of the scoop surface (ψ).
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Field Performance of Prototype Rice Transplanter for Mulching Cultivation
Kenji HIYOSHI, Masateru NAGATA, Teruhisa UMEZAKI, Bernardo D. TADEO, H ...
1998 Volume 60 Issue 4 Pages
13-22
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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A prototype of rice transplanter for mechanizing the mulching cultivation system was developed to perform mulch laying and transplanting simultaneously. It was then evaluated in the field based on performance accuracy of mulch slit cutting and transplanting. Actual mulch slit lengths were approximately 2cm shorter than the theoretical value as the film was on paddy soil but 1 to 2cm longer than the minimum value required for transplanting. The transplanting positions were 3 to 5cm rearward of the theoretical one. Hence, some slits were shortened and made imperfect, and miss transplanting was observed when film placement was altered. However, 92% of mulch slits had seedlings transplanted normally. Therefore, this transplanter was confirmed workable in the field.
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Proto-type Loading and Unloading Device
Yukio YAJI, Mikio YASHIRO
1998 Volume 60 Issue 4 Pages
23-28
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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A prototype loading and unloading device for a small test bunker-silo was developed and its performances were investigated. The traveling device running on rails which are installed on the walls of bunker-silo and the working device suspended from the traveling device performed well. The compression density after loading and compressing work was 318-490kg/m
3, and the unloading efficiency of sorghum silage was 226kg/min.
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Steering Control on Autonomous Operation using Position Sensing System and Geomagnetic Direction Sensor
Osamu YUKUMOTO, Yosuke MATSUO, Noboru NOGUCHI, Masato SUZUKI
1998 Volume 60 Issue 4 Pages
29-36
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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This study aims to develop a steering control system for following a predetermined path which was obtained by the module of a task planning. The tilling robot system which had a position sensing system (OPTREC) and a geomagnetic direction sensor (TMS) was developed. The OPTREC which was remodeled from an opt-electric type surveying instrument is able to follow the movement of the robot and measure the position in the interval of 0.5s to 0.8s. The steering controller which considered nonlinearity of the vehicle dynamics, enabled the robot to follow the predetermined path under the average lateral error of about 5.2cm on a flat field.
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Development of Leaf Removing Devices
Mitsuji MONTA, Naoshi KONDO, Naofumi AKIYAMA
1998 Volume 60 Issue 4 Pages
37-44
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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Part 1 and 2 of this series reported detecting algorithms of chrysanthemum cutting for a visual sensor in a robotic cutting sticking system. In this paper, lower leaf removing devices to arrange the shape of cutting were investigated. Physical properties of chrysanthemum cutting were measured for designing mechanisms of the devices. Based on the results, two types of devices were manufactured and tested. The first device had Y-shape cutter, which were opened and closed by a solenoid actuator, to cut leaves and petioles of cutting. The second device trimmed the shape of upper leaves by cutters and removed lower leaves and petioles of cutting by using shearing force. From the experimental results, it was observed that their success rates were around 90%.
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Attila J. BUKTA, Akira SASAO, Kenshi SAKAI, Sakae SHIBUSAWA
1998 Volume 60 Issue 4 Pages
45-53
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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The requirement for high work rates in order to achieve a high productivity, involves an increase in the tractor forward speed during transportation, thus loads induced during transportation can be extremely high. Load predicting methods would therefore be useful for designers in designing operations. In this study a nonlinear tractor-implement model with a free play in the three-point linkage was developed. Based on the experiments conducted by Collins and Sakai, the tractor-implement system was modeled as an impact oscillator, where the free play of the three-point linkage acted as an impact element. Equations of motion were derived using the method of Lagrange, assuming no rigid connection between the tractor and the implement. In numerical experiments, by varying the excitation frequency; periodic, subharmonic, and chaotic vibrations were observed.
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Flowable Herbicide Dropper with Piston Pump System
Masahito SAWADA, Norikazu TOHMA, Isao SATOH, Jun-ichi HAMADA, Hiroshi ...
1998 Volume 60 Issue 4 Pages
55-61
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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Improvement of environment and time saving are important needs of paddy farming system in Japan nowadays. For a solution, a flowable herbicide dropper with piston pump system has been developed. It is linked to a rice transplanter, and applys flowable herbicides while transplanting, rice seedlings. Neither different kinds of emulsifiable concentrates nor flowable herbicides showed any effect on discharge rate. The pipe line did not create any problem, provided it handled properly during and after the use, even the machine was shut down for a long period.
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Relationships Between Optical Density, Slopes of the Optical Density Distribution of Fruits and Fruit Firmness
I Wayan BUDIASTRA, Yoshio IKEDA, Takahisa NISHIZU
1998 Volume 60 Issue 4 Pages
63-71
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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A light transmittance measurement system consisting of a 783nm low power laser was examined to determine the optical density and slope of the distribution of optical density in cylindrical flesh samples of apple and Japanese pears. Furthermore, the relationships between these optical properties and the firmness of samples were examined. There were relationships (r>0.80) between the optical density and the firmness of fruits. The relationships between the slope and fruit firmness were very poor (r<0.53), except for Raritan apple (r=0.80). Changes in optical density and firmness were probably due to the ultra structural changes in the cell wall and in the middle lamella of fruit tissue.
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Koichi SHOJI, Tsuneo KAWAMURA
1998 Volume 60 Issue 4 Pages
73-74
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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Agricultural Products mostly in the U. S.
Akinori NOGUCHI
1998 Volume 60 Issue 4 Pages
75-81
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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Measurement and Analysis of Human Response
Fumitake ISHIKAWA
1998 Volume 60 Issue 4 Pages
83-87
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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Measurement and Analysis of Human Response
Kazuhiro SAKAI
1998 Volume 60 Issue 4 Pages
87-90
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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Measurement and Analysis of Human Response
Kyou KOBAYASHI
1998 Volume 60 Issue 4 Pages
90-94
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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Y. MORISHITA, T. YOSHIDA
1998 Volume 60 Issue 4 Pages
95-96
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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I. MATSUMOTO
1998 Volume 60 Issue 4 Pages
97-98
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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Y. HAGA
1998 Volume 60 Issue 4 Pages
99-100
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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K. TSUCHIYA
1998 Volume 60 Issue 4 Pages
101-103
Published: July 01, 1998
Released on J-STAGE: April 30, 2010
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