The characteristics of governing of the water cooled and the air cooled diesel engine have been tested and considered by the automatic control engineering. The characteristics of governing of the diesel engines have been affected upon the following system parameters; internal resistance f or k1, time constant of engine T1, sensitivity of fuel supply k2, time constant of fuel adjusting T2, sensitivity of governor k3. When these parameters of the diesel engines compared with those of the spark ignition engines (previous report I), the time constant of engine T1 and of fuel adjusting T2 of the diesel engines are larger than the spark ignition engines, but the internal resistance f and sensitivity of governor k3 are smaller than the spark ignition engines. In the diesel engines, the speed variations for the load fluctuations are smaller than the spark ignition engines, because the system parameter ωn of diesel engine are small.
We made a trial production of a simple form of driving typed soil penetrometer suitable for the investigations of the agricultural machines-soils relation. The view of the apparatus is shown in Fig. 1. It has so simple structure that it is very handy and portable, and the measuring values are accurate and reliable respectively. The dropping height H and the weight W are adjusted in accordance with the soil conditions so that the applicable range for the various soil conditions are enlarged remarkably. Then, we had many experiments in laboratory to verify the characteristics of the apparatus when it had various combinations of H and W, and tried also some measurements of soil hardness in actual fields. The results are as following: D=kD0, k=W0⋅H0/W⋅H Where, D0=standard driving index number at H=300mm and W=250g, D=driving index number at H and W, k=const. 5 times D0 is nearly equal with the soil hardness (kg) by Kanto- Tozan type soil penetrometer.
The writer made experiments on the relation of the crumbling characteristics of puddled clods to the load and crumbling characteristics of puddling rotors, in order to study various matters related to the mechanical engineering and soil physics. (1) Clods crumbled with puddling rotors showed an equal state below the crumbling limit, while in the range of the break crumbling, loamy soils were easier to harrow than clayey soils. As for the stirring-breaking effect, the higher the lugs, the greater the effects. (2) The electricity consumption for puddling showed a constant value in the range of the natural crumbling in the range of the break crumbling, the former was found to be in inverse proportion to the latter; and towards the crumbling limit; the formerr showed an increase, reaching the maximum value close to the crumbling limit. (3) The crumbling limit proved to be a physical critical point, and it was witnessed that the most effective puddling was done below the crumbling limit.
The locus calculating equations of the tooth of each order on each plural teeth of Japanese vertical screw type plow with plural teeth type were obtained in turn, from which a general equation was derived. The calculating or approximating formulas of horizontal cutting area, side uncutting area of plural teeth type and cutting volume per rotation of a tooth were obtained, and shape of cutting volume was investigated. Still more the calculating formula of pan uncutting volume was given and it was shown that the volume can be ignored by its real value calculation. Subsequently, the shape elements (form elements and actional elements) of screw tooth were analysed and defined, and were measured on the elements of manufactured goods, on which theoretical discussion of the shape and action was added. The results were as follows: the similar points or differences between the screw tooth, rotary hoe blade and plow body, and also the characteristics of screw tooth were made clearer. Problems left for further improvements were pointed out as well.
A trial manufacture of oscillating subsoiler which is attachable to ordinary small tractor was made for the study on the effects of oscillation to the subsoiler. The oscillating mechanism of this subsoiler is driven by crank and pitman arm which is adjustable its amplitude and frequency to following extend longitudinally; frequency of the chisel 10-35cps amplitude at the chisel point 0-45mm In the field experiment, following conclusion was obtained that the oscillation of chisel reduces slip of traction tires and improves pan breaks ability of subsoiler. Furthermore, this trial type subsoiler had well proved its durability for any kind of special tests at this experiment.
The Water-Dust (or Wet dust) and Mist-Dust application method were tried, using four types mist-dust mixed application nozzles made by the authors. In this paper, the mechanism of liquid medicine and dust mixed method and the characteristics of mixed droplets had been researched experimentaly. And the results of those were as follows; (1) With use mixed method, coverage to plant surface by chemicals was increased until max. 80.79%. (2) And the adhesion volume was increased too and the arriving distance was longer than the dust only application. Especialy, 2-head type and 3-head type nozzles had good performance. (3) Mixed application method fill up to the adhesion and the loss of fly in the only dust powder and make up the arriving force and the diffusion in the only mist, namely it make middle type application patterns. (4) In conclusion, then, it appears that these new application methods will be effective upon the increase of pest control effect and this new idea will be hopeful.
1. On the revolution of Arm-type sprinkler head, by which jet angle and revolving speed of sprinkler and jet are variable, direction angle θ or jet angle λ is a function of adjustable angle δ. H is given by equation (5) and λ by (6). 2. The torque T caused by sprinkler jet stream is derived as a function of jet velocity v, and δ, θ, λ. Friction torque TB is given by eq. (9), considering Coreori's Force TR. When the Head continues constant speed, the angular speed ω is given by eq. (10). When ω=0 the initial torque TB=T is measured and calculated at jet angles λ=0°, 30°, 60°, 90°, and 5 levels of water pressure. Compared Rainbird's head No. 30 with Arm type head, the torque of both heads is nearly equal at the range λ=27°-70°, and Arm-type head revolves round smoothly and nicely in these conditions.
We made a small self-propelled machine to mechanize harvesting rice. It threshes the rice in the state of standing. The main functional elements of this machine consist of: (1) feeding or guiding packers (2) threshing or separating mechanism (3) an Impeller-type cleaner (4) a mower which cuts threshed crops (5) crawlers Tests were made at the forward speed, 22.4cm/s and 50.0cm/s. Although guiding and threshing are well performed, header loss and chaffs in the grain tank are fairly much.
The author carried out the threshing test of wet paddy of 21-25% moisture content, by a self-feeding thresher and power thresher, with the research of paddy quality and the performance of separation. Results obtained are as follows. 1) Even if paddy is very wet, the cracked and broken rice is hardly found in threshed paddy, unless the revolution of threshing cylinder is extremely high. 2) Rice husked in threshing increased in accordance with the increase of revolution of threshing cylinder. Adequate speed of effective circumferential threshing cylinder is 500-550m/min, to prevent rice husked in threshing. But when the revolution of the cylinder is constant, wet paddy does not become husked than dry paddy. 3) The lusters of husked rice are not different between two treatments; paddy is threshed before it is dried or not. 4) Separation performance in wet paddy threshing is not always so worse than in dried paddy. In this test it can be said that the power thresher has better separation performance than the self-feeding thresher. 5) To save the labour and raise up the efficiency in rice harvesting, it is necessary to develop the small combine suitable for Japanese farmers which can perform reaping and threshing at the same time.