1940
DOI: 10.1243/pime_proc_1940_144_015_02
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The Problems of the Singing Propeller

Abstract: The unusual noise emanating from what is known as a “singing” propeller is the direct result of the vibration of the blades. These are disturbed by the irregular hydrodynamic actions of cavitation and vortex shedding and induced by the extreme variations in the wake. It is demonstrated experimentally that a blade with a sweeping plan form and sharp edge, suppresses cavitation and vortex action within the working range of the propellers. Sharpening the blade edges round the periphery, in a wedge-shaped manner, … Show more

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Cited by 12 publications
(11 citation statements)
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“…Bell-Not all vibrations of the propeller blades are accompanied by audible singing, but it is generally agreed that singing can be attributed to mechanical vibration of the blades (28). It should be understood that every underwater noise originating in the neighborhood of the propellers is not classified as singing.…”
Section: Bell a N D Clapper Effectsmentioning
confidence: 99%
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“…Bell-Not all vibrations of the propeller blades are accompanied by audible singing, but it is generally agreed that singing can be attributed to mechanical vibration of the blades (28). It should be understood that every underwater noise originating in the neighborhood of the propellers is not classified as singing.…”
Section: Bell a N D Clapper Effectsmentioning
confidence: 99%
“…The blades have been observed to vibrate with similar modes in both air and water when struck. The natural frequencies of blade vibrations are lower in water, however, because of the mass effect due to the inertia of the water set in motion with the blade and also because of hydrodynamic damping (25,28,34). The frequency for a given mode of vibration in water may be less than in air by the order of twenty-five percent (44) and is a function of the frequency itself in addition to other factors.…”
Section: Bell a N D Clapper Effectsmentioning
confidence: 99%
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