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Volume 27, Issue 1
Displaying 1-13 of 13 articles from this issue
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1965 Volume 27 Issue 1 Pages 1
Published: June 01, 1965
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (193K) -
1965 Volume 27 Issue 1 Pages 2-2,1
Published: June 01, 1965
Released on J-STAGE: April 30, 2010
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M. SONOMURA, Y. SHIBANO1965 Volume 27 Issue 1 Pages 3-5,10
Published: June 01, 1965
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn this report, the cooling performance of farm air cooled engine which was cooled by the radial fans having six different number of blades was compared, and the following results were obtained.
In this test, it was necessary to be cautioned that the cylinder temperature approached the extremely high value of 185°C at the rated load. The cylinder temperature rose higher han 185°C when cooled by less than eight blades fans.
From the viewpoint of the cylinder temperature and the required horse power of cooling fan, it seems that twelve blades fan was most favorable in this test.View full abstractDownload PDF (610K) -
Shifting Performance of LP Gas and GasolineS. MASUDA, R. TAKEUCHI1965 Volume 27 Issue 1 Pages 6-10
Published: June 01, 1965
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSExperimental researches were performed, in order to compare the efficiencies of the fuels for the LP gas carburetion in the case of shifhing between LP gas and gasoline. The shifting is done by the solenoid valve with three point switch. The results of the observation are shown by the output designation of the first variation, the second variation, total variation, difference of variation, the ratio of output, as well as the time necessary, the ratio of time, the quantity of fuel and air necessary, the ratio of the quantity, the venturi speed of the carburettor.
We observed the two defects in shifting from gasoline to LP gas that it takes a long time to shift, and the output cannot reach the definite value, though the ratio of output is within 10% and hovering of output is very little. Therefore, the excellent efficiency can be expected when enough time is given for shifting.
In the case of shifting from LP gas to gasoline, the time necessary for shifting is 10sec. less than the former, and after shifting we get the higher output than before. But the ratio of output and the hovering of ontput is so big that efliciency of shifting is poor.View full abstractDownload PDF (839K) -
J. DOI, Y. YASUDA1965 Volume 27 Issue 1 Pages 11-14
Published: June 01, 1965
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSMeasurements of forces acting on every part of a tractor, plow and 3 points linkage were made and autocorrelation function and power spectral density of the forces were obtained. Dynamic characteristics of the forces are as follows.
1. Deviation of the forces which decreases the traction performance increases with the tractor speed.
2. High frequency component of power spectral density increases with tractor speed.
3. Spectral density beyond 10c/s is negligible small and over-all characteristics of 0 to 100c/s is sufficient for instrumentation.
4. For higher working ability, broader width of plowing is more satisfactory than higher tractor speed. High frequency stability is necessary for higher tractor speed.
5. It can be assumed that the soil has the characteristics of steady random process.View full abstractDownload PDF (601K) -
Effect of the Travel SpeedC. IGAKI, H. YAMAMOTO1965 Volume 27 Issue 1 Pages 15-17
Published: June 01, 1965
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn calculating the rate of plowing, the ime required for turning on the headland differs depending on whether the tractor is driven only forward, or both forward and reverse. And so, first we must begin by diciding this value (See Fig. 1).
Secondly, in case the turning is contained in futile run, we must correct the value in anticipation of the velocity reduction (30-40%).
And moreover, in case the tractor run over the furrow slices on the cultivated headland, we must include the velocity reduction (10%at running straight ahead, 15-20% at turning) in calculating the rate of plowing.View full abstractDownload PDF (451K) -
Fundamentals of the Vertical Motion for a PlowJ. DOI, Y. YASUDA1965 Volume 27 Issue 1 Pages 18-23,14
Published: June 01, 1965
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDynamic stability of a plow is the most important problem in plowing. Depth uniformity of the furrow and minimization of the dynamic resistance of the plow mostly depend on this stability. A plow has six degrees of freedom of motion as a rigid body. Pitching and bouncing of the plow have greatest influence on the dynamic stability.
Equations of motion concerning the pitching and bouncing of a bottom plow are derived considering the deviation of the three components of the draft and pitching moment due to depth and attack angle variations. Refering to the stability criterion by Routh and Furwitz, it is concluded that the plow is not always stable.
There considered two ways of stability compensation. One is that the increase of directional stability by the long land-side, gage wheel and furrow wheel. In this case, however, plowing resistance is also increased. Another compensating device is the hitching mechanism which intervanes between the tractor. Fundamental characteristics of the hitching mechanism are as follows.
1. Restoring orientation of the plow is maintained for the depth deviation from the equilibrium.
2. Spring constant at the hitch point should be as small as possible. Namely, free linkage hitch is desired unless the hydraulic control is employed.
3. Draft point of the plow should be located as close as the hitch point and the gravity center is desired to be as low as possible.
4. Restoring moment is desired to be as great as possible by the configuration of the plow.
In case of the free linkage hitching, stability criterion for the hirizontal and vertical motion is not simultaneously satisfied. For further performance, hydraulic controlled linkage hitching is desired.View full abstractDownload PDF (1060K) -
Development of Load-Cell Type and 2-Plane Type Micro Soil Stress Meters and Their PerformanceO. KITANI1965 Volume 27 Issue 1 Pages 24-27
Published: June 01, 1965
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to reduce the deviation of stress measurement, the author has developed Load-cell type micro soil stress meters which are not sensitive to the change of pressure distribution pattern on the pressure plane.
Load-cell type meter has proved to have small deviation of measured value, small disturbance of stress field, accurate direction, good properties for dynamic measurement and good linearity for load change. Some of them could be used for a field test.
Then, the author has developed 2-plane type meters which pick up a summation of two principal stresses that is closely related to the tillage resistance. Ge-gage is used in one of them. Although the deviation of measured value is larger than expected, these meters have sufficient properties for the soil stress measurement in a soil bin. But, Gegage mounted meter has bad characteristics for temperature change.View full abstractDownload PDF (622K) -
On the Influence of the Relative Density of Soil and the Surface Pressure of SoilS. MORISHIMA, K. KOJIMA1965 Volume 27 Issue 1 Pages 28-32
Published: June 01, 1965
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWe have measured the piercing resistance force on the model mole piercers (the ball type) when the relative density of soil and the surface pressure to keep away the soil rise were varied. We used the sandy loam and the clay loam for the test.
The results are as follows.
(1) When the surface of soil is pressed, the piercing resistance force increases as the soil relative density increases and tip angle of ball decreases.
In the case of the free surface of soil, there is no clear tendency. But on the small tip angled balls it appears that piercing resistance force is larger than the larger angled ones.
(2) In the case of ball with skirt the piercing resistance force increases as the relative soil density increases and the skirt length increases.
But in the case of the free surface of soil, there is no clear tendency.
(3) When ball has a shank, the piercing resistance force increases as the soil denstiy increases, even if the surface of soil is not pressed.
(4) In the case of clay loam, the piercing resistance force has no relation with the tip angle of ball, whether the surface of soil is pressed or not, and it appears that the piercing resistance force increases as skirt length increases, but this tendercy is not clear.
(5) Effect of the shank is also found when the surface of soil is not pressed, but this tendency is far less than in the case of the sandy loam.
(6) When there is any obstacle on the path of ball moving, the piercing resistance force increases straightly.View full abstractDownload PDF (808K) -
On the Performances of a Large Hay Dryer and a Hay Tripod with Heated AirA. HOSOKAWA, T. NOMURA1965 Volume 27 Issue 1 Pages 33-38,32
Published: June 01, 1965
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESS1. The writers tests showed that a particular hay dryer the writers used would enable Hokkaido farmers to harvest 0.5ha, of first cut hay in a day or 1ha. of second and third cuts, provided the handling of hay would be well mechanized.
2. The cost per 1kg. of dried hay was estimated to be \3.18, the fuel cost being \1.40.
8. Hay tripods with a propane heater or a heating oil burner as shown in Fig. 1. were tried with the intentions that;
a. the method would eliminate a considerable part of hay handling which the operation of the large dryer necessitated.
b. only the inner half or two thirds of hay would be dried by heated air to avoid spoiling and the outer part of the stack would be dried naturally in the field, thereby reducing the fuel cost and the operational time of the heater.
c. the dried hay would be carried to the barn at a later time when the farmer has a convenience.
4. In one trial, the hay tripod was loaded with 264kg. of hay with 43% moisture content. After 45 minutes of heater and fan operation, it was left as it was for the following 11 days to allow the outer part to dry. The distribution of moisture contents of the finished tripod is shown in Fig. 2 and the propane cost was \0.81 per 1kg. of dried hay. About 8.5% of the total hay was discarded because it grew moulds as the result that it was in contact with either the ground or the straw cap. The rest of the hay thus cured, however, retained good colour and flavour.View full abstractDownload PDF (1157K) -
Particle Distribution Curve of Grains in BatchS. ISIBASHI, S. YOSHIZAKI1965 Volume 27 Issue 1 Pages 39-41
Published: June 01, 1965
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to improve the feed mill, first of all the authers investigated about particle distribution curve of some grains crushed with a hammer bar type mill.
From these experiments we found the following.
1. Particle distribution curve of grains crushed with the mill is approximately indicated by the following formula known as Rosin-Rammlers law,
R=e-bσn×100
where R=Residue of crushed products
δ=Particle size of crushed products
b, n=Constants
e=base of natural logarithm.
2. The index n of the upper formula varies form 0.7 to 1.8 at the hammers speed of 1, 500 to 3, 600rpm and it increases in proportion to the speed of hammers.
3. Except for the rate of feed at 300 grams, the index n is independent of the rate of feed to be crushed.
4. The Indian corn has the maximum values of the index n, followed by soybean, and the wheat has the minimum values among the grains experimented.View full abstractDownload PDF (401K) -
[in Japanese], [in Japanese]1965 Volume 27 Issue 1 Pages 42-49
Published: June 01, 1965
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1267K) -
1965 Volume 27 Issue 1 Pages 50-51
Published: June 01, 1965
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (408K)
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