巻号一覧
33 巻, 1 号
選択された号の論文の16件中1～16を表示しています
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1971 年 33 巻 1 号 p. 2
発行日: 1971/06/01
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (227K) -
1971 年 33 巻 1 号 p. 3
発行日: 1971/06/01
公開日: 2010/04/30
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安田 与七郎, 小田原 哲一1971 年 33 巻 1 号 p. 4-9
発行日: 1971/06/01
公開日: 2010/04/30
ジャーナル フリーThe authors have designed the electronically controlled fuel injection system which is suitable for a small general purpose gasoline engine.
This system regulates the supply of fuel very precisely to suit instantaneous running condition of the engine. To the fuel injector fuel is supplied at a constant pressure 2kg/cm2. Fuel is sprayed into the intake manifold only when the magnet valve of the fuel injector is opened by a solenoid. The duration of the fuel injector openning is equal to the width of the pulse of electric supplied to the solenoid. The width of the pulse is determined by electronic circuit, which is controlled basically by the absolute pressure in the intake manifold and modified by the speed of the engine and the temperature of the cylinder head.
By means of this injection system, it has been possible to reduce the fuel consumption and authors expect to reduce the air pollution by the exhaust gas and to improve the respones-characteristics of the engine.抄録全体を表示PDF形式でダウンロード (868K) -
処理効果と微粒化の関係竹内 竜三, 石井 征亜1971 年 33 巻 1 号 p. 10-14
発行日: 1971/06/01
公開日: 2010/04/30
ジャーナル フリーThe heavy liquid fuel droplets were injected into ethyl cellulose solution in n-propyl alcohol and photo micrographs of them were taken. When heavy oil was treated by ultrasonics, the effect of atomization, was as follows.
1) Sauter's mean diameter of treated heavy oil in ultrasonics was smaller than untreated one.
2) The maximum diameter showed a similar tendency to Sauter's mean diameter, and the relation between the former and the latter is shown in the following equation.
dmax≅2-2.5d
3) The phenomenon of atomization concerning treated heavy oil depends on colloidal nature, and lower diameter depends on sludge seperation.
4) The distribution curves of sprays of treated and untreated heavy oil are shown in the following equation.
Treated B heavy oil (LS)
……f=38X0.5exp(-0.0316X)
Untreated B heavy oil (LS)
……f=7.5X0.25exp(-0.0237X)
Treated LSB heavy oil
……f=35X0.5exp(-0.0341X)
Untreated LSB heavy oil
……f=50X0.5exp(-0.0265X)抄録全体を表示PDF形式でダウンロード (808K) -
静止沈下と走行沈下吉田 勲1971 年 33 巻 1 号 p. 15-18
発行日: 1971/06/01
公開日: 2010/04/30
ジャーナル フリーThe author studied the reason of the difference between static linkage and dynamic sinkage of the traffic on flat surface and found that static sinkage tended to be larger than dynamic sinkage because the ground was acted for longer time in the state of standing still than in the state of travelling. This reason was interpreted by the theory of rheology of soil.抄録全体を表示PDF形式でダウンロード (566K) -
梅田 重夫, 岸田 博1971 年 33 巻 1 号 p. 19-25
発行日: 1971/06/01
公開日: 2010/04/30
ジャーナル フリーThe drawbar and power transmission performance of the hydrostatic tractor Bolens 1250 were measured. This hydrostatic transmission consists of the variable displacement radial plunger pump (max. displacement 30.2cc/rev), the fixed displacement gear motor (55.0cc/rev) and hydraulic valves. The relief pressure is 112kg/cm2.
The maximum efficiency of power transmission at the full throttle opening was about 57% and this efficiency was taken by the pump displacement of about 80% of full opening. In this condition, the drawbar pull on the concrete road was about 200kg and the speed was 1.8-2.0m/sec.
It is important to apply the automatic power control system to this tractor. As the output pressure of hydraulic motor is proportional to the tractor load, it is possible to control the pump displacement by the output pressure of motor.抄録全体を表示PDF形式でダウンロード (1146K) -
クローラ型運搬車の試作小嶋 和雄, 緒方 一男, 池見 隆男, 土居 栄城, 大久保 淳一1971 年 33 巻 1 号 p. 26-32
発行日: 1971/06/01
公開日: 2010/04/30
ジャーナル フリーHarvesting and transporting belong to the heaviest work in vinyl house. The mono-crawler cart was therefore made experimentally which is a ground-run type transporter, for the reduction of labour and the examination of possibility and the propulsion of the mechanization. The mechanism and performance of this cart is summarized as follows.
(1) The crawler was adopted which is suited for running on the narrow path and getting over the heating pipes and others. The results of performance test showed that the power requirement for transporting the maximum load of 120kg was 200-240W at the speed of 20-25cm/s.
(2) The field efficiency was 40-55%.
(3) The performance of harvesting and transporting green pepper was worse a little than the customary working (manual) in the working time per unit yield, but was improved remarkably in the transporting distance per unit yield.
(4) The improvement of the working and operating performance may be accomplished by rebuilding this model to the small size and light weight battery-car, in future.抄録全体を表示PDF形式でダウンロード (2963K) -
部品の故障実態調査および信頼性の予測藤木 徳実1971 年 33 巻 1 号 p. 33-38
発行日: 1971/06/01
公開日: 2010/04/30
ジャーナル フリーThe binders, which have been developed in Japan of late, heve much diffused in the last few years. We investigated the impaired parts of 31 binders, and intended to clear up the causes of the failures by the Weibull probability diagram. By the use of the diagram, the parts which were needed to change the design, the force of the urgency, the mean time to failure of the parts and the root causes of the troubles could be predicted.
The survey up to Jan. 1970 showed that the following parts got out of order, (A) binding clutch arm, (B) driving chain for binding section, (C) knotter bill, (D) pick-up tine, (E) cutter blade, (F) throwing arm, (G) cord cutting knife, (H) universal joints for straw shifting shaft and (I) spring pins for rotary paddles to shift straw.
The parts E, A, B, C, D, F and I wore-out and failed. The mean times to failure became shorter in their order. To insure longer lives of these parts, it would be neccessary to change the design and the material and to retrain operators of the binder.
The parts G and H failed because of random failures, and they did not seem to wear-out at that time.
The parts C, D and H showed initial failures. To eliminate these failures, quality controls, running tests in the producing stage, and the operational training for users would be effective.
Were the failures only in the parts A, B, C and D, it could be said that the reliability of the binder would fall to 9 percent in the third year, and 50 percent of binders would fail in all parts A, B, C, F and H before the binders would have harvested 720 hours or 55 hectares.
The use of Weibull probability diagram for analyzing failures of binders was effective in that it analyzed failures in the relationship between strength of the parts and users' actual circumstnces of operation.抄録全体を表示PDF形式でダウンロード (1077K) -
条刈形刈取機の作業方法と作業能率清水 浩, 深山 重信1971 年 33 巻 1 号 p. 39-44
発行日: 1971/06/01
公開日: 2010/04/30
ジャーナル フリー1. The authors classifild the operating methods of rowcrop grain harvesters into I-IV types as in Fig. 1. To study the relation between the field size (W′, L′) and the machine operating rate (C), the general equation of each operating method was determined by working locus.
2. When the types II and III were combined, the general equation was determined to define the optimum width (W″best) to change from II to III type. Also the general equation for the work rate (C23) was introduced.
3. The standard values of work elements for row crops grain harvesters (two row riding type combine, walking type thresher, walking type binder) as shown Table 2 and 3 were obtained from the investigation using them. These values were put into the general equation. The combined equation of type II and III was able to apply to rotary plowing.
4. We studied on the reaping area by hand of the headland. The total working rate of machine (CM) was estimated from the sum of working rate of machine (C) and threshing time of headland. All working rates (CT) were calculated from the sum of (CM) and hand reaping time of head land. The values of (C), (CM) and (CT) for each working method and the size of field were obtained concerning two row riding type combines.
5. The optimum operating method for a field size was confirmed concerning two row riding typ combines.抄録全体を表示PDF形式でダウンロード (895K) -
往復運動の場合岩尾 俊男, 川村 登1971 年 33 巻 1 号 p. 45-52
発行日: 1971/06/01
公開日: 2010/04/30
ジャーナル フリーIt was found from previous experimental results that the most suitable frequency of the screening existed over the range of centrifugal effect values K=1-2.5, and that the screening characteristic was affected by the motion of grain on the screen surface.
This paper deals with the moving characteristics of a grain which repeated sliding or both sliding and jumping movements on the horizontal reciprocating screen surface with the projection angle of 45° (degree). The four-bar linkages were adopted to oscillate the screen in the reciprocating motion. The motiom of a grain on the screen was experimentally studied from the pictures of stroboscope and the oscillogram of acceleration and phase angle, in addition to the the theoretical analysis.
The main results were as follows.
1) When the frequency of the screen was small, the grain slided along the screen surface; when the frequency of the screen exceeded the sliding limits, the grain jumped on the screen. In these cases the motion of grain may be more or les influenced by the friction and its shape.
2) In the rolling motion of grain (paddy), the experimental value of the mean velocity of grain was slightly greater than the theoretical value.
3) The flowing velocity of grain was increased with the increasing of the value of K and gradually decreased with the increasing of the coefficient of friction of grain.
4) The flowiug which was calculated based on the value of the maximum acceleration of the screen, velocity of grain on the screen with the quick return motion was nearly equal to the experimental value without the rolling motion of grain.抄録全体を表示PDF形式でダウンロード (5344K) -
細川 明, 本橋 圀司1971 年 33 巻 1 号 p. 53-59
発行日: 1971/06/01
公開日: 2010/04/30
ジャーナル フリーThe authors constructed an apparatus for measuring drying characteristics of a single grain of rough rice, which was showed in Fig. 1.
The performance of the apparatus was as follows:
1. The temperature, the relative humidity and the velocity of air were controlled within a range of (20-60)±0.5°C (0∼90)±1% R. H., 1.5±0.05m/s, 0.05±0.005m/s, respectively.
2. The glass beam to measure the grain weight had the senesibility of 2μg and an accuracy of 1/20, 000. The air current could be maintained around the rice while reading the weight of it was measured. The experimental results under the conditions shown in Table 1 were as follows.
1. The drying curves of unhulled rice obtained were shown in Figs. 4-1, 4-2, 4-3.
2. The drying curve of one grain of unhulled rice showed three stages distinctly, viz, the initial rapid drying period, the constant rate period and the falling rate period, except for the drying curves with 80% relative humidity for any air temperatures.
3. The initial short rapid drying period seemed a constant rate period, but its true nature could not be determined.
4. The constant rate period was in the range of 15.5-5.7% db/h and was influenced by both the temperature and the relative humidity of air.
5. The heigher the temperature and the lower the relative humidity of the air, the greater was the falling rate. when the air temperature was the same, the slope of falling rate curves was the same regardless of the humidify of air. Fig. 5-1. When the relative humidity was kept constant, the slope of falling rate curves depended upon the temperature of the air stream, Fig. 5-2. Therefore the slope of falling rate curves was little influenced by the rleative humidity. This tendency was also shown in Figs. 6-1 and 6-2 whose abscisae were time and the ordinate the moisture content ratio.
6. At a constant relative humidity, the equi librium moisture contents became almost the same in spite of difference in air temperatures.抄録全体を表示PDF形式でダウンロード (1100K) -
1971 年 33 巻 1 号 p. 59
発行日: 1971年
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (104K) -
粉粒状植物体の圧縮成形性に関係する要因洪 隆宣, 川村 登1971 年 33 巻 1 号 p. 60-66
発行日: 1971/06/01
公開日: 2010/04/30
ジャーナル フリーDirect shear tests, durability tests and expansion tests were made according to design of design of experiments using orthogonal arrays on the solidity of compressed plant material (alfalfa) differing with the condition of powdered materials and its atmosphere after compression tests by means of piston. A summary of the results is given below.
1) Compressed materials of leaves compared favourably. in the solidity with that of stalks.
2) The solidity depenped on the difference in sizes of particles and the part of materials was the best when the powder was of more than 0.42mm, and not more than 0.84mm and of a leaf.
3) If the shock durability was taken as a criterion, factors which showed effect upon the solidity, in dereasing order, were the temperature, additives, the part of materials, size-distribution of particles and the moisture content. The effect of temperature and an additive was especially large
4) Increasing the temperature (to 80°C) gave good solidity.
5) Saccharose produced a better effect on the solidity than fat.
6) Addition of saccharose whose quantity was 10% of the plant material was effective, but addition of fat was ineffective when the quantity was 10% of the plant material.
7) The plant materials of 16% moisture content, wet basis, gave better solidity than those of 12% moisture content, wet basis.
8) The more there were different sizes of particles, the better the solidity was.
9) More binding ingredients except fiber were found in the leaf then in stalks, the compressed leaf material had the better solidity and temperature effect than the stalk material.抄録全体を表示PDF形式でダウンロード (1049K) -
長距離貨車輸送時の段ボール箱の劣化中馬 豊, 岩元 睦夫, 秋元 浩一1971 年 33 巻 1 号 p. 67-73
発行日: 1971/06/01
公開日: 2010/04/30
ジャーナル フリーTransportation tests by a freight car, from Fukuoka to Tokyo, were made to investigate the cause of deterioration of carton boxes of Citrus Unshu, and the data with respect to the shock of vibration, in-transit temperature and the increase of water-content of cartons during transportation were obtained.
1. The compressive strength of carton boxes used in the Fukuoka-district was lower than of the Saga district by about 76.8 percent and one of the reasons was attributed to the liner-paper used which was below the standard.
2. The printing design which crosses over the face of the carton such as used in the Fukuoka-district must be improved from the view point of compressive strength.
3. The temperature of cartons located in the center of the car was higher by 2.5 to 3°C than that of other boxes.
4. The shock of vibration acted on cartons in the freight car was severe in the upper part of loading, and th magnitude and occurrence of vibration were greater and more frequent in the following order: longitudinal, vertical and lateral direction.
5. The moisture content of carton boxes was 9.5 percent at the departure, whereas that at the destination (after 50 hours' transportation) was 18.1 percent for the carton filled with produce and 13.1 percent for the empty-carton.
6. Cartons loaded in the lower part of a freight-car resulted in a higher water-content of liners and lower compressive strength of boxes.抄録全体を表示PDF形式でダウンロード (5378K) -
小泉 武紀, 岩永 光雄1971 年 33 巻 1 号 p. 74-80
発行日: 1971/06/01
公開日: 2010/04/30
ジャーナル フリーIn order to develop the studies on portable rotary cutters, the numerical calculation for forced vibration of bars was carried out that seemed to be useful for comlicated bar system with many mass and springs etc.……The frorced vibration of a simply supported bar was also calculated analytically, and compared with it.
There results obtained are as follows;
(1) There was very slight difference between the results by numerical calculation procedure in which the simply supported bar was devided to 20 sections and that by analytical calculation.
(2) The results by 20 sections were almost the same with that by 40 sections
(3) reffering to the number of divided sections, twenty seemed to be ssufficient number for the forced vibration of simply supported bars.
(4) The numerical calculation in this report will be very comvenient when we desire to know the amplitude, the shearing force and the bending moment at any point of bars, which have many mass moments of inertia and springs etc抄録全体を表示PDF形式でダウンロード (1036K) -
1971 年 33 巻 1 号 p. 81-82
発行日: 1971/06/01
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (356K)
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