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Volume 52, Issue 5
Displaying 1-20 of 20 articles from this issue
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Active Participation of Agricultural Engineers is ExpectedA. Hayamizu1990 Volume 52 Issue 5 Pages 1-2
Published: 1990
Released on J-STAGE: April 30, 2010
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Development of the Electronically Controlled ExpanderKenji IMOU, Osamu KITANI, Tsuguo OKAMOTO1990 Volume 52 Issue 5 Pages 3-10
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAn electronically controlled expander was fabricated and tested. It is used for a power output unit of a solar thermal engine which operates on Rankine cycle. The expander is reciprocal and oil free. The valve timings are controlled to match with the pressure of working fluid and the load. In this paper, the theoretical studies on efficiency characteristics of the reciprocal expander and the experimental results of the electronically controlled expander are reported.View full abstractDownload PDF (3732K) -
Dynamic Characteristics between the Track Roller and the Rubber CrawlerEiji INOUE, Jun SAKAI, Shigeki INABA1990 Volume 52 Issue 5 Pages 11-18
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTo make clear the dynamic behavior of the rubber crawler system, the constants of dynamic spring and viscous damping of a crawler were measured at 12 points between adjacent two core bars, with the system being excited on a vibrating table with a certain range of frequency.
Results certified that the higher the frequency, the bigger the dynamic spring constant while the viscous damping constant became smaller. Both constants varied between core bars with a similar tendency as the static spring constant.
Further, a dynamic three-dimensional model of a crawler vehicle driving on a solid horizontal surface was proposed, and its motion equations with these physical parameters were obtained which enable to estimate the dynamic driving characteristics of the vehicle.View full abstractDownload PDF (1283K) -
A Row Following Control SystemXuejun WEI, Munehiro TAKAI, Satoru NAMBU1990 Volume 52 Issue 5 Pages 19-26
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA Computer-hydraulic controlled steering system was developed to be applied for low-speed farm vehicles such as self-propelled transplanters, self-propelled thinners or weeders.
This system comprises a row-finding sensor with three infrared switches, a steering angle sensor, a tractor velocity sensor and a head-land guidance units. Using the measurement data from these sensors, a single board micro-computer controlls the hydraulic units to make the system follow a plant row and turn at head-land to enter the next row. Experiments were conducted for both artificial and real plant rows to determine the performance of the system.
In this paper, the structure of the hard-ware and the soft-ware, the row following performances and several factors influencing the parformances of the system are described. The headland-turn controlling techniques will be reported in the next paper.View full abstractDownload PDF (1422K) -
Ryo TORISU, Junichi TAKEDA, Tastuya BANNO1990 Volume 52 Issue 5 Pages 27-34
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper formulates the equations of multi-articulated vehicle behaviour at low speeds with the effect of the centrifugal force being neglected. At low speeds, there is a simple relation between the direction of motion of the vehicle and generalized steering wheel angle, and the turning behaviour mainly depends upon the geometry of the steering linkage.
Derived equations can describe not only the general motion of the system which is travelling at a steady low forward speed but also its backward manuevouer at a low speed. The trailer wheel trajectories obtained by the experiments using a small-scale model of a four-wheeled tractor trailer agree well with the theoretical ones, which are calculated from these equations by Lunge-Kutta Method.View full abstractDownload PDF (1233K) -
Basic Studies on Soil Adhesion with Soil Shooting DeviceKazuhiro SERATA, Shingo YAMAZAWA, Tomoo AOYAMA, Shingo MIYAMOTO, Kengo ...1990 Volume 52 Issue 5 Pages 35-41
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the previous paper, the effects of water content of soil to its adhesion to rotary tilling devices were reported.
The present report discusses the soil adhesion to the inner surface of the cover of the rotary devices in the context of soil texture, water content of soils, angle of shooting soil against the surface, material of the surface (steel, teflon, polyethylene, oleoresin). Experiments were carried out with a specially designed shooting device.View full abstractDownload PDF (3824K) -
Performance Produced without Fluid InjectionKen ARAYA, Tsukasa MAEKAWA, Satoshi TSUNEMATSU, Rui GAO, He Ping ZHAO1990 Volume 52 Issue 5 Pages 43-50
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThree factors favor the use of powered rotary subsoilers: (a) Power can be transmitted directy, more efficiently than through drawbar pull; (b) Reduction in draft requirements by tillage tools reduces the need for heavy tractive vehicles, thereby reducing soil compaction; and (c) Reduction in draft requirements allows tillage operations to be performed under more difficult traction conditions.
The goal of the study is to develop a powered rotary subsoiler to inject pressurized fluid (for instance sewage sludge) into soil from the tips of the subsoiler blades. We hypothesized that the force and the wetting action of the injected fluid would break down the soil structure in front of the subsoiler blades. This paper investigates the number of subsoiler blades, the machine travel velocity, the speed and the direction of subsoiler rotation, all without fluid injection.
The power requirements of a rotary subsoiler at forward rotation was same as at reverse rotation.
Reverse rotation on very hard fields produced abnormally large torque which caused machine trouble.View full abstractDownload PDF (7295K) -
Heat Collection Capacities and Its Measurement Methods of a GreenhouseKazuo HORIBE1990 Volume 52 Issue 5 Pages 51-57
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA simple greenhouse for grain drying was constructed to use for forced-air drying. The solar heat collected and the collection efficiency at a quasi-steady state were measured with varing the airflow rate. In a greenhouse for radiation drying, the drying method was not directed by the airflow rate. Therefore, it was showed that the solar heat collected could be easily estimated from the air temperature at non-steady states. A vinyl sheet was put on the heat collection surface to investigate its effectiveness on the heat collection. An influence of the net radiation on the collected at the each heat collection surface was indicated.View full abstractDownload PDF (1157K) -
Force Acting on the SeatYoshinohu OHTA, Tatsuo HIROMA1990 Volume 52 Issue 5 Pages 59-68
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSForces around the tractor seat are in the state of the dynamic balance even while operator handles any maneuvering parts. The operating motion on the tractor was discussed basing on this situation.
The results show that the magnitude of the force on the seat which is the vector sum of the force on backrest and the vertical force on seat surface, exists at about 80% of operator's weight. By depressing a foot pedal, the force on backrest increases and the vertical force on the seat decreases; the resultant force on the seat remains almost equal to the magnitude in the static working posture. The pedal force was almost equal to the difference of vectors between the force on seat by depressed pedal and that in the static working posture.View full abstractDownload PDF (3629K) -
Mechanical Properties of Vegetative MaterialsHaruhiko MURASE, Satoshi OKE, Sakae SHIBUSAWA, Yoshiaki NAKAMURA1990 Volume 52 Issue 5 Pages 69-77
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the first installment, the application of the finite element inverse analysis to parameter estimation of mechanical properties of agricultural materials has been reported. It was confirmed based on a numerical experiment that the installation of the finite element program in the analysing system was effective. In the second installment, the main discussion wes focussed on the measuring system that provided data which would be fed into the analyzing system. The verification of the main system performance was made by test runs using actual vegetative materials.
In this final installment, the total evaluation of this developed system was discussed. The identification process of the water potential effect coefficient of vegetative material was summerized. The fuzzy Young's modulus was defined to model the stochastic nature of vegetative materials. The system was put into practical operation for the tasks on determination of the mechanical properties of vegetative materials. The fuzzy Young's moduli, the Poisson's ratios, and the water potential effect coefficenets were determined with several varieties of vegetables including some vegetables with difficulties in handling in conventional measuring methods such as green peppers (sweet peppers) and onions.View full abstractDownload PDF (3019K) -
Intelligent Robot for Transplanting Calluses in SubcultureTsuguo OKAMOTO, Osamu KITANI1990 Volume 52 Issue 5 Pages 79-85
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAn intelligent robotic system which could perform biotechnological operations in plant callus subculture stage was developed and tested. Operations of getting callus images through a TV camera, processing image data to recognize their shapes and to calculate centroids, cutting and dividing them, grasping and carrying a piece of them, and putting it on culture medium in a Petri dish were automatically and intelligently carried out by the robotic system under the computer control.
Control algorithm for the system was optimized and image data processing was done speedily through three areas separated in an image data frame. Noises on image frames were cut off and cleared by a program of software filter. Two devices, cutter and hand for calluses, were attached on a tool plane of the robot manipulator and two kinds of operation were carried out one after another. In this system, it took about eighty seconds to complete a series of handling operation from cutting a callus into two pieces to putting them into Petri dishes.View full abstractDownload PDF (3377K) -
Kentaro MOHRI1990 Volume 52 Issue 5 Pages 87-92
Published: 1990
Released on J-STAGE: April 30, 2010
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Prevention of Developing of Oily Stained Cocoons in Vacuum DryingYasuhisa SEO, Hiroshi MORISHIMA, Shigeru KAWANA, Tsutato MIYAZAWA1990 Volume 52 Issue 5 Pages 93-96
Published: 1990
Released on J-STAGE: April 30, 2010
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Y. SAITOH1990 Volume 52 Issue 5 Pages 97-100
Published: 1990
Released on J-STAGE: April 30, 2010
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[in Japanese]1990 Volume 52 Issue 5 Pages 102-105
Published: 1990
Released on J-STAGE: April 30, 2010
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[in Japanese]1990 Volume 52 Issue 5 Pages 106-112
Published: 1990
Released on J-STAGE: April 30, 2010
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[in Japanese]1990 Volume 52 Issue 5 Pages 113-116
Published: 1990
Released on J-STAGE: April 30, 2010
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[in Japanese]1990 Volume 52 Issue 5 Pages 117-121
Published: 1990
Released on J-STAGE: April 30, 2010
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[in Japanese]1990 Volume 52 Issue 5 Pages 122-127
Published: 1990
Released on J-STAGE: April 30, 2010
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[in Japanese]1990 Volume 52 Issue 5 Pages 128-131
Published: 1990
Released on J-STAGE: April 30, 2010
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