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・ Silent Running (disambiguation)
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Silent running (submarine)
・ Silent Sam
・ Silent Sam (comics)
・ Silent Sam (disambiguation)
・ Silent Sanctuary
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・ Silent Scandals
・ Silent Scope
・ Silent Scope (series)
・ Silent Scope 3
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・ Silent Scream (1980 film)
・ Silent Scream (1990 film)
・ Silent Scream (2005 film)


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Silent running (submarine) : ウィキペディア英語版
Silent running (submarine)

Silent running is a stealth mode of operation for naval submarines. The aim is to evade discovery by passive sonar by eliminating superfluous noise: nonessential systems are shut down, the crew is urged to rest and refrain from making any unnecessary sound, and speed is greatly reduced to minimize propeller noise.
The propellers have a characteristic RPM band in which no cavitation noise arises. Since this rotation speed is usually relatively low, the first electric submarines had special "silent running" engines designed for optimum performance at reduced speed. These required less active cooling (further reducing noise), and were generally equipped with plain bearings rather than ball bearings. These engines were also acoustically decoupled from the hull, as they employed belt transmission rather than direct coupling to the propeller shaft.
Nuclear submarines can run even more quietly, at very low speeds only, by turning off active reactor cooling during silent running. The reactor is then only cooled by natural convection of the water.
==See also==

*Acoustic signature
*Acoustic quieting

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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