自航模型船のプロペラSurface forceの計測について

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This paper provides the experimental studies on the measurements of the propeller surface force of a self-propelled model that excites hull vibrations, especially in the horizontal direction. The model ship tested is 1/40 scale of 60,000ton d.w. tanker, which one of the writers and his coleagues previously measured on her propeller bearing forces in 1961. The present tests have been carried out at the new experimental tank in our institute. The surface forces along the boundary of the screw aperture of the model ship was measured at twelve points by the strain measurements of reeds which had been specially devised in our laboratory. The axial clearance and the rudder clearance are changed by moving axially the propeller and the rudder respectively for given stern frame of the ordinary U-type. The effects of the number of blades of the propeller, the advance ratio, and the rudder clearance as well as the axial clearance on the surfance force of the upper and lower parts of the stern frame and the rudder were observed. These partial surface forces were calculated from the measured strains of the reeds. Furthermore the total surface force exciting hull vibration was calculated from the above partial surface forces, considering the phase difference of the vibratory forces. The results were compared with some of the existing works. As a result, the effect of number of blades and the axial clearance upon the surface force of the stern frame was confirmed as follows. The horizontal vibratory surface force at the stern frame or the rudder surface induced by the propeller of even number blades is less than that induced by that of odd number blades propeller. On the other hand, the exciting force of the upper or lower half of the stern frame decreases with the increase of the number of blades of the propellers. It is to be noted that the resultant horizontal surface force at the stern frame and the rudder are far from bearing a simple decay curve for the axial clearance, because the phase difference between both surface forces of the stern frame and the rudder are considerably changed for the axial clearance, and there is the minimum surface force for axial clearance in the present experiment. Since we have to estimate the propeller exciting force of the single screw ship as the vector sum of the wake bearing force and the resultant surface force mentioned above, it is necessary to study further the bearing force with its phase lag and confirm the propeller exciting force by measuring the response of the hull vibration of the model ship.
社団法人日本船舶海洋工学会の論文
1965-08-31

自航模型船のプロペラSurface forceの計測について

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