一自航試驗器の作製とそれに依る試驗
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概要
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A dynamometer for self propulsion test was designed and made as in Fig.1 and Fig.2. The main principle of the apparatus is as follows : The propelling power is supplied by a motor which is set on the bottom of model ship, and connected to the propeller shaft with 2 spar gears. The number of revolution of the propeller is known from the record of the revolution of the motor shaft, which is indecated on the revolving drum by means of worm gear and electric contact. The turning moment of propeller is known from the measurement of the rotating force of the motor case, which is supported on motor shaft using ball bearings at both ends of the・ca-ing, and made to revolve by the repulsive force of armature with equal and opposite amount, the method of the measurement being the same as in the case of a brake dynamometer. The thrust is measured by the balance, an arm of which is pushed by 2 knots of a ring supported around the propeller shaft by 2 ball-rings of the thrust bearing type fixed to the propeller shaft. The above 3 elements, viz. revolution, turning force, and thrust, are recorded on the rotating drum, and beside these, the time, the running distance, and the relative position between ship and truck, are recorded on the same drum, as shown in Fig.3. The weight of the dynamometer without variable balancing weight is 12.5 kg, and the total weight with balancing weights will not over 15.0 kg, even at the usual high speed for common fishing boats. (model length P.P. 2.5 m) Few experiments were made by the dynamometer, and the results were compared to that of behind test by the ordinary propeller dynamometer with the resistance dynamometer, showing the good reliablity of both the experimental apparatus, as seen in Fig 4,Fig.5 and Fig.6.
- 社団法人日本船舶海洋工学会の論文
- 1940-04-10