巻号一覧
23 巻, 2 号
選択された号の論文の11件中1～11を表示しています
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田中 孝1961 年 23 巻 2 号 p. 39-44
発行日: 1961/12/28
公開日: 2010/04/30
ジャーナル フリーTo consider the relations between the fixed angle of the lug to the tractor steel wheel and drawbar pull or soil reaction, the tests were practised by the device as Fig. 1, and resulted as
(1) Drawbar pull and sinkage of lug into soil, when the soil bin was drafted horizontally, increased with the load on the lug and increasing ratios of them to lug load became large with the angle between the lug and soil surface.
(2) And they were related with sinkage of lug. The resistance of soil became large with the increase of contact area of lug to the soil caused by increases of sinkage.
(3) Specific resistances of the sinking vertical area of lug were independent with the lug angle, and the resistances to the lug at the case when the sinking area was the same were all equal as Fig. 8 (a). But, specific resistances of the vertical area of all lug surface contacted to the soil were varied by the lug angle as Fig. 8 (b). And their curve was quite resembled with the curve of ratio of the sinking lug height to the all lug height in Fig. 9. Then, it was naturally considered that the specific resistances of all lug area were smaller than that of sinking area.
(4) As the lug load which was used to calculated the ground contact pressure were all the same, the pressure of contact shown in rig. 10 shows the area of the horizontal surface of lug consequently. They are rather the problems of compression of the soil, and they must be considered by the soil nature and by help of soil dynamics. From these viewpoint, the tests and considerations are expected to be continued.抄録全体を表示PDF形式でダウンロード (923K) -
1961 年 23 巻 2 号 p. 44-44,48
発行日: 1961/12/28
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (717K) -
防振ゴムの負荷振動吸収能力とひずみの関係について竹内 龍三1961 年 23 巻 2 号 p. 45-48
発行日: 1961/12/28
公開日: 2010/04/30
ジャーナル フリーUsing the six sorts of engine suspension types include rubber damper, the author studied relation between the dynamic response of rubber and strain of foundation frame. As the result of these experiments, absorbing characteristics of rubber were cleared. Moreover, optimum load and combination of optimum disposition of rubber were decided.
Light load of engine drive was the most useful load whose amplitude is 30% lower than full or heavy load. Effective rubber arrangements were used the one by one rubbers in the bolt between engine wood frame and base wood frame.
The consequence of calculatien of vibration strength had coincide with experimental value that was about 1kg/cm3-s. Hand vibrographic amplitudes, strain values and strength magnitudes were same trends and absorbing vibration methods were established.抄録全体を表示PDF形式でダウンロード (654K) -
ローラ・チエンの伝達特性梅田 重夫1961 年 23 巻 2 号 p. 49-52
発行日: 1961/12/28
公開日: 2010/04/30
ジャーナル フリーThe speed fluctuations of the driver shaft have been tested in the roller chain driving system when the follower shaft has been loaded periodically.
The characteristics of transmission of this system are as follows;
In the light load, the speed fluctuations are maximum at the frequencies of load fluctuation 0.6-6.8cps in the low revolutions of sprocket, but they become larger at the frequencies 1.5-1.8cps as the revolutions of sprocket increase.
In the heavy load, the speed fluctuations are very large at the low frequencies of load fluctuation in all revolutions of sprocket, but they become smaller as the frequencies increase.抄録全体を表示PDF形式でダウンロード (597K) -
土壌構造とpFの関係について田原 虎次, 藍 房和1961 年 23 巻 2 号 p. 53-57
発行日: 1961/12/28
公開日: 2010/04/30
ジャーナル フリーThe study is taken up to look over the connection between soil structure and the energy with which moisture is held by a soil. To indicate the energy, applying the pF-value. The pF-value is the logarithm of the hieght, in centimeters, of a water column necessary to produce a force epual to the energy to draw water apart from a soil.
The soil, in natural state, has a very complex structure, so the making study of a connection between soil structure and pF-value, is in need of simplification the factor of structure.
The test soil is picked out from the volcanic light soil, and is divided into these three classes by sieving in water, 2-1mm, 0.5-0.25mm, and below 0.25mm in diameter.
The apparatus to measure the pF-value is to use sucking system; in which manometer, constant temperature box, pressure adjusting flask, burette, and soil vessel with filter are connected. Each three kinds of soil are filling up to the vessel first time densely and second time loosly. Thus, the soil structure changes to six varieties. The results of measurment are as Fig. 6.
This diagram says that the pattern of curves are decided by a diameter of the soil grains, not by the factor of “loosely” or “densely”.
The moisture is of a narrow range at low stage of the pF-value, and it becomes wide at high stage of pF-value.
The curves of “loosely” are placed rightwards to the curves of “densely”. It means the energy with which moisture is held by a soil, changes according to the soil structure.抄録全体を表示PDF形式でダウンロード (763K) -
耕耘機の騒音について庄司 英信, 森嶋 博1961 年 23 巻 2 号 p. 58-62
発行日: 1961/12/28
公開日: 2010/04/30
ジャーナル フリーAuthors measured and analysed the sound pressure level and frequency spectrum on the noise of power tiller. Even if the sound pressure level passes the Automobile Standards in Japan, operator ought to work under fairly intense noise level, which amounts to 90-100 decibel. Such noise can cause temporary threshold shift especially at the frequencies around 4000c/s.
The noise of power tiller mainly consists of exaust note and mechanical noise from engine and gear box, however, as the velocity of engine increases, noise from secondary noise source grows rapidly.抄録全体を表示PDF形式でダウンロード (808K) -
中馬 豊1961 年 23 巻 2 号 p. 63-68
発行日: 1961/12/28
公開日: 2010/04/30
ジャーナル フリーThe relation between the regulation of “Bulldeeper” and its faculty in the rice field was investigated, and the following results were obtaind.
(1) The slicing angle of the blade (3°-6°) gives much influences on the tilling depth, especially when the blade-length was adjusted longer than 41cm.
(2) The tractive resistance of the blade is reduced due to the thrust of the rotating rotary.
The percentage of the reduced pull increases with the shorter blade, and is much influenced by θ (θ: slant angle of the blade).
(3) The thrust of the rotary increases with the tilling depth of rotary DR, and is nearly eqaul regardless of that of the blade DB under certain DR.
(4) The tractive resistance differs with the adjustments of devices, by which to regulate slicing angle and the length of blade, in spite of the same tillage depth of the blade.
(5) The influences of increasing the tillage depth of (DB-DR) and (DR1-DR2) respectively on the tractive esistance were compared,
where DR1: deep tilling depth of rotary
DR2: shallow tilling depth of rotary.
(6) Result of an efficiency test for deep tillage is followed.
Net required hours/10a Running speed (m/sec) Time for turn at head land (sec)
h min 2.30 0.21-0.26 23抄録全体を表示PDF形式でダウンロード (774K) -
粉・粒状肥料の安息角・内部摩擦角と流動性との関係涌井 学1961 年 23 巻 2 号 p. 69-72
発行日: 1961/12/28
公開日: 2010/04/30
ジャーナル フリーThe angle of repose and internal friction angle of fertilizer seldom correspond. The author studied the relations of these two kinds of angles theoretically. The former angle is affected partly by the latter, but chiefly and proportionally by the aggregation of particles which include cohesion.
The aggregation of fertilizer is a function of a unit-weight, and is affected by internal friction and relative surface area, which is decided by the fineness and shade of a particle or an aggregate. Both theoretically and experimentally, the more intensive the aggregation is, the lower its fluidity is. So that, the angle of repose conveniently indicates the fluidity of fertilizer. The fluidity is, however, affected not only by such negative factors as aggregation which is presumed from the angle of repose, but also by positive factors concerning the reduction of density of fertilizer in case of being sheared.抄録全体を表示PDF形式でダウンロード (2275K) -
守島 正太郎, 葛原 定郎, 中川 健治1961 年 23 巻 2 号 p. 73-75
発行日: 1961/12/28
公開日: 2010/04/30
ジャーナル フリーFriction loss of head of polyethylene flexible pipe for sprinkler irrigation (d=3.81cm, l=38.7m, trade name s polynite) was tested.
Fig. 3 shows the result obtained in comparison with other experiments (eq. (3) or (4)) for turbulent flow in smooth pipe. Eq. (5) is the experimental formula.
From fig. 3, it is distinct that head loss due to friction of polyethylene pipe is less than any other ones, i.e. polyethylene pipe has a extreme hydraulic property.
In addition that, it is so light, flexible and excellent to anti-weather that we can most suitably use it for portable sprinkler irrigation.抄録全体を表示PDF形式でダウンロード (396K) -
特に刃尖角, 刃尖巾の摩耗測定法森田 昇, 田谷 暢久1961 年 23 巻 2 号 p. 76-78
発行日: 1961/12/28
公開日: 2010/04/30
ジャーナル フリーA method for measuring the top edge angle and top edge width of blade has been deviced. The interior deformation of blade at its top edge was caught on the thin solder plate of 20×20×1mm, and was measured by microscope. The blades of a rotary mower and a sickle were much more worn at their top than at their end. In this experiment, the cutting limit of top edge width of a rotary mower was about 70μ, and that of a sickle about 30μ.抄録全体を表示PDF形式でダウンロード (2479K) -
スロワーに関する2・3の実験松本 始, 大西 秀明, 日下部 兼吾, 森本 国昭1961 年 23 巻 2 号 p. 79-82
発行日: 1961/12/28
公開日: 2010/04/30
ジャーナル フリーThe damage and crush of rice grains by throwers have been studied in detail. The results obtained are summarized as follows.
1) In respect of the damage and crush of grains, the blade with nylon wire brush brought about better results than the one without brush.
2) The hardness of the blade had to do with the damage of grains. The increase of hardness resulted in the increase of the damage.
This tendency became more distinct with increasing of the lift of the thrower.
3) The damage of grains by the conveyer system was greater than that by throwers, so far as the lift was not so high.
4) The crush of grains by the throwers has a certain relation with the gap between the blade and the drum of the throwers.
When the gap was narrower than 1.5mm, the crush of grains was comparatively few. When the gap was from 1.5mm to 2mm, it was maximum. When the gap was over 2mm, it decreased, as the width of the gap increased.抄録全体を表示PDF形式でダウンロード (2443K)
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