All issues
Volume 50, Issue 3
Displaying 1-16 of 16 articles from this issue
- |<
- <
- 1
- >
- >|
-
M. YAMAZAKI1988 Volume 50 Issue 3 Pages 1-2
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1748K) -
Fuel Extraction and Engine PerformanceKen ARAYA, Satoshi TUNEMATU, Eiichi ISHITANI, Tukasa MAEKAWA, Masayuki ...1988 Volume 50 Issue 3 Pages 3-10
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTo utilize the strained draff of sunflower seed oil (seed draff), the sunflower oil remaining in seed draff was extracted with kerosene. The extracted oil was used as a diesel fuel. The strained draff of the extracted oil (exracted draff) was also processed to solid fuel by mixing with wood chips.
To obtain an extracted oil with the the same viscosity as No. 2 diesel oil, the mixing ratio was 0.5g kerosene to 1cm3 seed draff. About 73% of the sunflower oil remaining in seed draff could be extracted with kerosene. The output performance with the extracted oil was similar to the No. 2 diesel oil. The cold startability with extracted oil was excellent, and there was no wear of the injection pump. A small amount of white deposit accumulated around the injection nozzle port during idling.View full abstractDownload PDF (6661K) -
Diesel Engine Modification for Alcohol FumigationHideo TERAO, Kazuhiko OHMIYA, Noboru NOGUCHI1988 Volume 50 Issue 3 Pages 11-19
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe concept of this study is to utilize alcohol made from farm products and wastes as diesel engine fuel. The purpose is to know how to convert a diesel engine for farm use into the one which generates brake horsepower with lower consumption of brake specific heat and lower smoke density by alcohol fumigation.
In this paper, a small diesel engine for farm use was remodeled to operate in a dual-fuel mode with alcohol. Judging from data on brake horsepower, consumption of brake specific heat and smoke density, it was found that the optimal injection timing of the remodeled engine with diesel fuel only was at BTDC 14°C A, while with fumigation of alcohol mixed it was at BTDC 4°C A. Though cylinder pressure traces, measurements of ignition delay and rate of pressure rise were not made, it seems that diesel fuel injection timing was controlling the start of combustion.View full abstractDownload PDF (3050K) -
Effect of Roughness of TerrainKazuhiko OHMIYA1988 Volume 50 Issue 3 Pages 21-26
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTo evaluate the characteristics of the rotational vibrations of tractors (pitch, roll, yaw), three classes of terrains, a smooth concrete road, a rough unpaved road and a rough terrain like a grass land, were selected and the effect of the roughness of terrain on the rotational vibrations were investigated. The results showed that the angular accelerations on the rough terrain were greater than that of other two terrains. Consequently, the rotational vibration levels were increased as the roughness of terrain was increased. The roughness of terrain influenced peak levels of the angular acceleration PSD curves, but peak frequencies of PSD curves were varied very little. This showed that the frequency components of the rotational vibrations of tractors were not influenced the roughness of terrain.View full abstractDownload PDF (749K) -
Braking PerformanceShu-huai ZHANG, Hideo TERAO1988 Volume 50 Issue 3 Pages 27-35
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper analyzed the effect of trailer types, brake systems, traffic conditions, rates of trailer loaded weight, locking and unlocking of brakes on its braking performance. The equations were derived from a simple dynamic model of tractor-trailer combinations (TTC).
The conclusions were as follows: (1) The unbalanced trailer showed to have better braking performance than the balanced trailer. (2) The braking performance of a TTC in which the trailer is not equipped with brakes was shown to be much poorer. In the case of the balanced trailer, the braking performance of a TTC in which the front axle is equipped with brakes, was shown to be better than when the brakes are on the rear axle. (3) The braking performance of a TTC running on traffic condition such as concrete could not be said to be certainly good. (4) The trailer loaded weight must not be more than the rated weight carrying capacity.View full abstractDownload PDF (1343K) -
Design of the Experimental Vehicle and Its Control SystemKunio SATO, Isao TAJIRI1988 Volume 50 Issue 3 Pages 37-44
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAn experimental electric four-wheel drive and steering vehicle has been manufactured for trial, and its control system has been constituted, in order to examine the running efficiency of a vehicle used for the works frequently using cornering action from the aspect of attitude control.
Each wheel of the experimental vehicle is designed to be independently driven and steered so that the center of cornering can be set up at any position. The control system is centering around a 16-bit CPU with a coprocessor for numerical calculation because it is required to perform many floating-point arithmetic operations by a computer.
The variables to be controlled are inputted or outputted by means of peripheral equipment such as A/D and D/A converters and digital input/output devices. Each drive motor of four wheels is so cooperatively controlled as to deliver an equal torque regardless of steering condition.
As a result, the experimental vehicle has enabled to simulate a four-wheel drive and steering vehicle equipped with a central differential gear and measure its cornering characteristics.View full abstractDownload PDF (1018K) -
Physical Properties of Clayey Soils from View-point of Tillage, Day Stage Soil Moisture Contents and Available Day Rate for tillageYutaka KANETANI, Isamu KURATA1988 Volume 50 Issue 3 Pages 45-51
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to establish the optimum tilling methods in the areas of clayey soils, we have been investigated the physical properties of clayey soils from view-point of tillage. The clayey soils have the properties in high rates of clay contents of about 35%, large value of liquid limit of 71 to 88% and large value of plastic index of 38 to 55. In the fields of clayey soils, water permeability has become quite poor and tilling operation has became difficult. The main reason seems to be that the gley layer under the topsoil layer prevent the water permeability. Available day stage for tillage, which are based the calculation on soil moisture contents, are estimated at short periods from April 4 to November 15, and an available day rate for tillage is estimated at 64% in TAKADA (NIIGATA prefecture) which rate shows small value comparison with SAPPORO's, TOKYO's and FUKUOKA's. Especially, an available rate in autumn shows extremely small values. It seems that the precipitation in TAKADA is much in autumn.View full abstractDownload PDF (993K) -
Nobutaka ITO, Xiu-lun WANG1988 Volume 50 Issue 3 Pages 53-59
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTo improve the trafficability of terrain vehicle, the lug has been attached to the tire. In recent years, the high lug tire is standardized as the normal equipment for agricultural tractor. In this paper the effect of the height of lug was investigated using four wheels with the same diameter, but different height of lugs. The small scale soil bin was used for the experiment. The high lug tire showed a good contribution to improve the trafficability on clayey soil, but not on sand.View full abstractDownload PDF (792K) -
Calculation of Solar Radiation on the Each Face of the GreenhouseKazuo HORIBE, Yiping WANG, Kenji NAKAGAWA1988 Volume 50 Issue 3 Pages 61-68
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to collect solar heat by the greenhouse efficiently, the points question on the solar radiation were studied.
At first, solar radiation on a floor, an outside FRP and a inside FRP surface of the greenhouse were estimated and then expressed as a function of azimuth angle, heat collection area and solar radiation on horizontal outside surface.
Secondly, when the greenhouse was utilized as an air-type collector, it became apparent that the optimum position of heat collection face was nearer the roof of the house than the floor.
Furthermore, in case that a dryer was placed in the house, the solar radiation on the heat collection area was calculated and the factors affecting on the radiation were investigated.View full abstractDownload PDF (1084K) -
Takaharu KAMEOKA1988 Volume 50 Issue 3 Pages 69-76
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSUsing a laboratory dryer, a series of thin layer drying experiments were performed on rough rice at five constant temperatures with absolute humidity of 0.01kg/kg' of air, changing the bed depth in three levels (7mm 17mm and 27mm). As the result, it was shown that the depth of a bed considered to be a thin layer in practical use was not fixed among differnt drying conditions.
It was also found that the whole drying period was divided into two drying stages, namely drying, first, takes place mainly in the hull and then drying rate becomes governed by the internal diffusion rate of grain kernel. Since this thin layer drying characteristics are similar to the single kernel drying characteristics, they are thought to be represented as the average drying characteristics of all single kernels in the bed.View full abstractDownload PDF (1180K) -
Effect of Electrostatic Pesticide Application for Greenhouse CropKohnosuke TSUGA, Hideyuki ICHIKI, Michio KAJIYAMA1988 Volume 50 Issue 3 Pages 77-84
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSElectrostatic application of fine dust formulation by knapsack type duster, smoking pesticide by axial blower and liquid formulation by non-heating fog machine with an electric field of high voltage wire, which was presented in the previous reports, were carried out in the greenhouses where cucumber, melon and eggplant were cultivated.
These applications improve the deposit of chemicals all over the crop in these greenhouses mainly on the under surface of leaves, and the improvement of pest control for cotton aphid on the abaxial surface against conventional non-electrostatic applications were recognized.View full abstractDownload PDF (1169K) -
The measurement and analysis of equilibrium moisture contentSatoshi MURATA, Akio TAGAWA, Sadato ISHIBASHI1988 Volume 50 Issue 3 Pages 85-93
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSEquilibrium moisture content of five kinds of cereal grains, rough rice, wheat, barley, pearl barley and soy bean, was measured and fitted with the Chen-Clayton's equation. On the basis of these results, the latent heat of vaporization of water in the grains (steric heat) was calculated precisely from the Clausius-Clapeyron's equation without the assumption in Othmer plot principle. Moreover an empirical equation for estimating the latent heat in the grains was developed as a function of moisture content and temperature, and fitted to the heat in high goodness of fit.View full abstractDownload PDF (1148K) -
Motion analysis of the fertilizer particles spread by the turning bladesJunichi SATO1988 Volume 50 Issue 3 Pages 95-105
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIt is difficult to use a centrifugal distributor applying fertilizer on the steep grassland or on a field growing tall crops like maze. In order to develop a wide swath fertilizer spreader which throws granular fertilizer in a long distance by vertically turning blades, the theoretical analysis was made about the motions of fertilizer particles on the turning blades, and the flying trajectories of the particles.
The analysis of particle motions showed the leaving locations, outlet velocities and discharge angles of the particles from the turning blades, and the theoretical throwing distances of the particles. And the computer simulation predicted the optimum mechanical conditions to spread granular fertilizer on wide swath.
Based on the theoretical analysis, the data to design the wide swath fertilizer spreader were shown in this report.View full abstractDownload PDF (1547K) -
Estimation of Temperature Distribution in MaterialSei-ichi OSHITA1988 Volume 50 Issue 3 Pages 107-115
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAn estimation technique of temperature distribution along the heat flow direction in a material was devised. It could contribute to the quick determination of thermal diffusivity. This technique is available to the system of infinite flat plate which is insulated at one surface. The estimation only requires temperature responses at both surfaces.
As a result of the analysis on the basic concept of the estimation technique, it was shown that the estimation error depends mainly on the Fourier number. These relationship was represented quantitatively for easy use. The fourier number gives the applicable conditions of this technique, which was clarified to be effective under arbitrary initial conditions by employing the numerical experiments.View full abstractDownload PDF (1020K) -
Ching-Loong TSAI, Ritsuya YAMASHITA, Kiyokazu GOTO1988 Volume 50 Issue 3 Pages 117-121
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (758K) -
Masamichi DAIKOKU, Fumitake ISHIKAWA, Kouichi TOSAKI, Yoshiji OCHIAI, ...1988 Volume 50 Issue 3 Pages 123-128
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (887K)
- |<
- <
- 1
- >
- >|