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Volume 53, Issue 1
Displaying 1-14 of 14 articles from this issue
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H. SHIRAISHI1991 Volume 53 Issue 1 Pages 1-2
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2007K) -
Development of Dual-Fuel Control SystemNoboru NOGUCHI, Hideo TERAO1991 Volume 53 Issue 1 Pages 3-11
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe utilization of alcohol as diesel tractor engine fuel was investigated. A personal computer based control system was developed to control the flow rates of gas oil and alcohol. With this control system it was able to use alcohol for a diesel engine in various operating conditions and achieve the important control requirements such as engine speed, torque curve setting and engine stop.
The alcohol can be supplied up to more than 50 percent of the fuel energy to the engine at full load. This system with the digital PID controller indicated satisfactory performance with quick response to load changes. In case of changing from 4/4 load to no load in 2sec, the maximum speed difference was approximately 13.5 percent and the settling time was about 5sec.View full abstractDownload PDF (1569K) -
Field Test of Optimum Fuel Efficiency ControlJiaolong LIU, Jun SAKAI, Kei NAKAJI1991 Volume 53 Issue 1 Pages 13-20
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe concept of the optimization of tractor engine performance was proposed, and an experimental tractor was developed for a multipurpose control system in the previous paper. In this paper, the optimal fuel efficiency control which needs a compound control of engine and transmission was discussed, and a computer program was developed.
The transient characteristics of the control system was examined through two kinds of field tests of pulling a small riding tractor on asphalt road and drawing a subsoiler in paddy fields, and it was proved that the control system of this research was practical.
Furthermore, the fuel consumption characteristics of popular tractors in the market were analyzed, and the optimal fuel efficiency control was estimated for fuel saving.View full abstractDownload PDF (5177K) -
Improvements of Soft- and Hardware for the Detection of Tractor PositionYoshiaki MISAO1991 Volume 53 Issue 1 Pages 21-28
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn view of the development of automatic steering tractor, a low-cost image processing unit consisted of a computer-eye, a microcomputer, a radio control unit and a crawler tractor with hydraulic devices were utilized experimentally.
Several improvements of software and hardware for the detection of tractor position were described in this report. The first one of the improvements was a method of removing isolated points in order to remove the noise. The second of them was an improved method of detection of pixels in different brightness. The third of them was an improved image board pattern.View full abstractDownload PDF (1474K) -
Analysis of Tractive Performance and Weight Transfer of an Ordinary 4-WD TractorNobuhiro TANO, Minoru YAMAZAKI, Takashi MEGA1991 Volume 53 Issue 1 Pages 29-37
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSNowadays about 90% of tractors produced in Japan are four-wheel drive (4-WD) type. The main reason is that home-manufactured 4-WD tractors enabled the reduction of turning radius by using bevel gears in front wheel drive system.
In order to improve tractive performances of 4-WD tractors, it was proposed by the authors that 4-WD tractors should be furnished with a front wheel assist action by means of rotating front wheels faster than rear wheels. To attain this subject, an optimum speed ratio between front and rear wheel must be found. In this paper, a weight transfer equation of 4-WD tractor was established and influences of drawbar height, weight distribution and speed ratio were investigated by traction tests on a concrete road. Speed ratio between front and rear wheel was changed by using three kinds of rear wheel of different sizes.View full abstractDownload PDF (3522K) -
Measurement of Soil Stresses and Displacements in Tillage with a Rectilinear Motion BladeSatoshi YONEKAWA, Osamu KITANI, Tsuguo OKAMOTO, Naoki SAKAI1991 Volume 53 Issue 1 Pages 39-46
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn attempt to get data for analyzing a soil-tillage tool interaction, a soil bin test device was developed as one of main parts of this system, and a series of experiments was conducted using a soil-cutting blade with a rectilinear motion. Many kinds of experiments are possible with this system. Dynamic performance of the soil stress/displacement sensor was valid through these experiments. Many kinds of data for analyzing the interaction such as the relationships between soil stress and strain, movement, and surface pressure of the blade around vertical plain in the middle of this blade were measured simultaneously by 12 sensors in the soil.View full abstractDownload PDF (1461K) -
Measurement of Three Component Forces and Torque of the Tillage ShaftSoon Goo KWON, Jun SAKAI, Eiji INOUE, Naonobu UMEDA1991 Volume 53 Issue 1 Pages 47-54
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to design a reasonable power driven disk plow, the theoretical analyses for motion and angle factors of an arbitrary point on disk edge, the minimum gang angle to avoid the pressing of furrow wall, the sectional area and center of gravity, the inertia moment of furrow slices were reported in the previous papers.
In this study, three component forces of tillage resistances and tilling torques acting on the disk were measured about the power driven disk plow and the free rotating disk plow in the artificial field.
Based on results of the measurement, the effects of curvature radiuses of the disk and gang angles on tillage resistances and tillage torques were investigated.View full abstractDownload PDF (2928K) -
Eiji BEKKI1991 Volume 53 Issue 1 Pages 55-63
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA far-infrared panel heater was used experimentally for drying rough rice. The normal infrared absorption spectra of moisture in a rice kernel is 2.9μm, but because the corresponding temperature of the radiated heat is too high, there is concern for heat damage. In the experiment a panel heater with a wavelength of 3.3 to 8μm which heats to much lower than 250°C was used.
Drying tests were conducted with the rice on a dryer with a circulating capacity of 2tons per hour. The mean drying rates were 0.34, 0.57, and 0.77%per hour for cycle times of 31, 16, and 9 minutes respectively. The temperature of the rice was kept below 30°C, but there was a tendency to develop light cracks in the rice after repeated circulation. No heavy cracks formed. The electricity to dry 1kg of rice moisture was 1.535kW·h at minimum, just as in a continuous dryer.View full abstractDownload PDF (1509K) -
Outline of Experimental Equipment No. 1Kunio MORI, Kazuo HORIBE, Yoshihisa HORINO, Arihiro ISOMURA, Yoshihide ...1991 Volume 53 Issue 1 Pages 65-72
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA two dimensional plant transfer equipment is developped in which the control of plant interval is possible both in longitudinal and transverse direction. The plant intervals are spread by carrier driving gears using an extended line of hooks in the longitudinal direction and by the carriers applying parallel links in the transverse direction. In order to spare futile spaces and to increase operating efficiency, the cultivating bed is divided into two parts and a turn-around mechanism is provided. The plant intervals designed in this equipment based on a growth curve of Lettuce (cultivar Okayama) are compared with the plant intervals obtained from experiments, and both are well agreed.View full abstractDownload PDF (1256K) -
From Land Preparation to Transplanting on Paddy FieldPertiwi Setyo, Toshio KONAKA, Masayuki KOIKE1991 Volume 53 Issue 1 Pages 73-82
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to stabilize the agricultural production, it is necessary to design the appropriate farm work plan. Depending on the region, level of the technology etc., the form of the appropriate farm work plan will have some variations. This research specifically designs the decision support system for the optimization of the farm work planning that is supposed to be applicable to a developing country like Indonesia.
In the computer program developed in this research, agricultural mechanization database system, linear programming, scheduling, the substitution of the man-machine combination and the operation cost calculation techniques were applied. An objective function which derives a minimum cost for the given system constraints was established.
System implementation to some Indonesian farm groups has shown the capability of the system on the optimization of farm work planning.View full abstractDownload PDF (1439K) -
Flowing States of Paddy, Brown Rice and Polished Rice in an Inclined Open ChannelEiichiro SAKAGUCHI, Senkichiro HAYAKAWA1991 Volume 53 Issue 1 Pages 83-90
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the previous Paper, it was found that the micrestructural theory by Kanetani could be applied to the flow of grains in an inclined open channel.
In this paper, velocity and density distributions in the layer of the grains flowing in the channel were measured by using paddy, whose moisture contents were controlled into 4 steps, and brown and polished rice. Considerations were given to the flowing states of the grains by macroscopic method, and microscopic method using Kanetani's theory. As a result, the flowing states were characterized by the amount of interaction between grains in which grain rotation and shear were taken into account, and by the energy dissipation rate. It was recognized that the two variables had positive correlation with the average gradient of velocity distributions, respectively.View full abstractDownload PDF (1298K) -
Satoshi MURATA, Kiyoshi MIYAUCHI, Yoshiki HORI1991 Volume 53 Issue 1 Pages 91-95
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (754K) -
Effects of Soil Properties on Abrasion and Cause and Effect DiagramTooru YAMADA, Seizou GOTOU, Minoru YAMAZAKI1991 Volume 53 Issue 1 Pages 97-102
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2819K) -
Practical InformationT. FUKUDA, T. SHIBATA1991 Volume 53 Issue 1 Pages 103-108
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (930K)
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