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Volume 19 (1957 - 195･･･
- Issue 4 Pages 129-
- Issue 3 Pages 89-
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- Issue 1 Pages 1-
Volume 19, Issue 1
Displaying 1-9 of 9 articles from this issue
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1957 Volume 19 Issue 1 Pages 1-3
Published: June 30, 1957
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (620K) -
Y. IKEUCHI, J. NAGAHIRO1957 Volume 19 Issue 1 Pages 4-8
Published: June 30, 1957
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe load measuring apparatus, which we used, consists of a transducer (such as a torque pickup) using electrical resistance strain gages, two electronic amplifiers, a direct-ink oscillograph, an electro tachometer and two event markers. They have proved to be satisfactory, to some extent, in field test to determine load requirements in agricultural machines. However, the engineer may need to be familiar with the principles, characteristics, and handlings of each elements of the apparatus.
In using this apparatus for farm machine testings, we have encountered with various problems.
Some problems have been found to be as follows:
(1) One of most common troubles in using the torquemeter was the hash voltage caused by the bad conditions of brush contacts with sliprings of the torque pickup.
(2) The frequency range of 50 C P S, in which the direct-ink oscillograph has responded, will give accurate results and it will be almost enough for most measurements required on farm machinery. But the chart paper driving device should be made more accurately.
(3) In order to minimize the hum effect, frequentry encountered in usiug the electro-tachometer, we have successfully applyed capacitor.
(4) Two event markers designed in our institute are used to record time and to check speed. Their principles and circuits are very simple and there has been not any problems.
(5) The effectiveness of described apparatus will depend upon how to apply the transducer, or what types of transducer will be used. We will coutinue study on these problems.View full abstractDownload PDF (2875K) -
On the Moving Conditions Affecting the Occurrence of Miss-firing in Spark-plugYUTAKA CHUMA1957 Volume 19 Issue 1 Pages 9-12
Published: June 30, 1957
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe moving conditiotns affecting the occurrence of miss-firing in 2 cycle farm engine were studied by means of the gradual reduction of the value of inserted parallel resistance of spark plug until the miss-firing occurs in the cylinder.
The results obtained are as follows:
The occurrence of miss-firing tends to become hard, inspite of the increase of electric leakage passing through the spark plug, under the conditions such as the increase of burdened load, the decrease of spark gap, the increase of r.p.m. of engine, the decrease of the amount of mobile oil mixed with gasoline, and the increase of the ratio of air: fuel mixture in the sphere of practical use. Under each condition mentioned above, the more durability to miss-firing can be recognized at the higher cylinder temperature.View full abstractDownload PDF (672K) -
No. 2 Reaction Force of the Soil to the Wheel SurfaceT. TANAKA1957 Volume 19 Issue 1 Pages 13-17
Published: June 30, 1957
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFrom the motion of the tractor wheels, and the internal stress of the soil by the wheel motion to the soil, we could obtain the reaction forces to the wheel.
1) On the compressible soil, from the founda-mental idea the amount of the soil that will be compressed is to be proportional to the amount that has already been compressed, we obtained the reaction forces to the wheels, and we found the distribution of the forces to the wheel surfaces, the supporting forces of the soil, and the rolling resistances.
2) As the moisture in the soil has been increased, the soil that has been compressed can not support the load, and will be broken or flowed plastically. In these case, we can used the idea of the limit of supporting force introduced by Caquot.
3) But the internal friction angles of the soil in the Caquot's equation are not constant at the case like the swampy paddy land. Then we know that we must find the relations between the depth of the soil and the internal friction angles experimentally.View full abstractDownload PDF (703K) -
The influence of the structure of soils for evaporation of soil surfaceT. Tawara, S. Nakazawa1957 Volume 19 Issue 1 Pages 18-22
Published: June 30, 1957
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWe investigated the influence of the 6 artificial structures of soil for evaporation of soil surface.
We made them in Wagnels pot. Several pot is equivalent the state as follows.
No. 1 Nature condition.
No. 2 Immediately cultivating.
No. 3 After the cultivaion elapse a few days.
No. 4 Minute soil layer covers on the surface of the No. 1 pot.
No. 5 Minute soil layer covers on the surface of the No. 2 pot.
No. 6 Minute soil layer covers on the surface of the No. 3 pot.
Then we investigated the evaporation of soil surface about these pots in Summer, in case that the special time of the soil moisture, evaporation of the No. 2 pot is a little, as compared with the expect pots. But in winter is distinct.View full abstractDownload PDF (2353K) -
Characteristics of a Performanec with Air, and of a Spraying Performance for the Fog MachineA. ISHIHARA1957 Volume 19 Issue 1 Pages 23-27
Published: June 30, 1957
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFor the purpose of it investigate that the characteristics of a performance with air and of a spraying performance for the fog machine. The first considered the atomization method of congelation system theoretically. And adopted for a factors that effected to atomized mechanism, a temperature, a pressure, and a velocity of steam of chemicals, and a shape of nozzle part, and a temperature, cooling coefficient of blowing air. The next made an experiment on air velcioty dispersions and distributions by use of the fog machine. And under that condition by use of a water tested a spraying performance in both sides of a drops numbers and a drops diameter. And the more, the rate of exhaust gas velocity to blowing air veloicty is changed by made narrow a exhaust pipe section and then investigated its influence to a drops dispersion with regard to a number and diameter of a spraying drops.View full abstractDownload PDF (1000K) -
On the plate Fan Casing being used for the Threshing MachineS. TSUNEMATSU, S. NAMBU1957 Volume 19 Issue 1 Pages 28-32
Published: June 30, 1957
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThese fundamental experiments were conducted to design the casing most effectively fitted to the plate fan of the threshing machine.
The results were as follows:
(1) The required power is shown in Fig. 2 (a). The forward tilted blade fan is higher than the backward. (2) Mean wind velocity V=a⋅n, here n is r. p. m. of fan rotor, a is constant, which is shown in Table 2. (3) Overall efficiency of the forward tilted angle high. The highesteff iciency are obtained at 0° and +22° tilted blade angle, respectively at the two and four blades.
(4) The vertical distribution of wind velocity, such as shown in Fig. 3 (a), is lower at upside rather than downside. (5) The horizontal distribution of wind velocity is shown in Fig. 3 (b). It is similar to the w-type and V-type, respectively at Casing I and II. (6) In the case of casing I, the rates of wind velosity deviation are respectivel 9-11% at two blades fan, 7-9% at four blades fan, and it is 2-3% lower than in the casing II. It is found from Fig. 4 that minimum rates occurs at about 0°-+22°tilted blade angle.View full abstractDownload PDF (2622K) -
Analysis of ensilage cutter power requirementsH. Ezaki, T. Goto1957 Volume 19 Issue 1 Pages 33-36
Published: June 30, 1957
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn this report 4 flywheel type ensilage cutter were studied. One has a 6″ feed roller length (6″ tyke), and the other 8″ type.
The amount of useful work and amouut of unnecessary work performed by the ensilage cutter is rather vague, and there is a possibility to improve our cutter.
we analysed the power requirements by means of electric power motter, rectifier and oscillograph. (Fig1) we had some results.
1) Feed mechanism do not regire excessive power. at the range of 600-900r.p.m of flywheel speed. Power requiement percentage of feed mechanism is 10-20%
2) Power requirement percentage of total horsepower due to cutting material, acceleratoin of material and the other work (contain unnecessary work) are 30-50%, 12-20% and 20-40%, respectively. (Tabe 3)
3) assuming a constant rate of material flow, power requirements for cutter, vary with the speed of knife travel is constant, power requirements vary with the feed rate.
4) Power requirements of cutting material vary with the shape of knife.
5) tower required to move air is proportional the total size of fan blade and the cube of fan speed.
6) Power requirement due to accelation of material are showed next formula.
Pa=0.1134×10-4×Qv2
7) we can not get the result of true friction loss in the fan housiug.View full abstractDownload PDF (624K) -
Experimental analysis of “Blowing” and “Throwing”, effect of guide vane and correlation between the centrifugal force and the strength of circular disc with fan bladeY. Tamura, R. Takeuchi, A. Ishihara1957 Volume 19 Issue 1 Pages 37-42
Published: June 30, 1957
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSOn the third report, we examined experimentaly the mutual relation of the effects of blowing and throwing. On this experiment we also changed the angle of fan blade, air velocity, air volume and r.p.m. and from those results, at the outlet of fan case, the throwing energy were about 4-3.5%. On the fourth report, we considered the various methods of improving the blowing-up performance.View full abstractDownload PDF (1101K)
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