双螺旋船に於て主機械又は推進器の相互干渉による船體振動の防止方法
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概要
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Forced vibrati ns in a vessel are attributable to many causes, and those due to the main engine and propeller have the most remarkable effect. Vibrations due to the unbalance of the main engine have of late been considerably reduced with the advance in knowledge concerning design, and it is now not impossible to eliminate those which are produced by the reaction of torque, by means of a torque reaction balancer. However, as regards the vibrations caused by propellers, until recently there have been no means other than those conservative or passive methods which can only reduce vibrations, and such are not of much effect. The author conducted investigations into the causes of vibration in the S.S. "Nagasaki Maru" and "Shanghai Maru" in the year 1929,and discovered that the propeller was responsible for the vibrations and that there was a great variation in them, depending on the phase difference of the rotations of the propellers on both sides. To prevent these vibrations, a phase synchronizer was invented by the author, which is the subject of this paper. Investigations have been continued since then of vibrations in vessels, with the result that the author found a great variation in the vibrations of twin-screw or quadruple-screw vessels, and confirmed that they came from the main engines or propellers The gear in question has recently been adopted for the first time in the new Shimonoseki-Fusan Cross-channel Ferry Boats of the Imperial Government Railways, the "Kongo Maru" and the "Koan Maru", and actual results are now available. In the present paper, the author gives the results of investigations on the relation between the phase difference of rotations the variation of vibrations due to the main engine and the propeller, together with an account of the principle and construction of the phase synchronizer as well as its actual performance results.
- 社団法人日本船舶海洋工学会の論文
- 1937-12-28