Accession Number:

ADA063867

Title:

Calculation of Low Frequency Cavitation Source Strength of Marine Propellers.

Descriptive Note:

Technical memo.,

Corporate Author:

BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS

Personal Author(s):

• Greeley,D. S.

Report Date:

1978-07-01

Pagination or Media Count:

66.0

Abstract:

This memorandum documents recent improvements to a model for the prediction of volume-time histories for sheet cavitation on the blades of merchant ship propellers, and the low frequency acoustic radiation resulting from these sheet cavitation volume fluctuations. This model is part of a larger effort directed at predicting the statistics of ocean ambient noise due to merchant shipping. A description of the mechanics of sheet cavitation on propeller blades and the acoustic radiation resulting from fluctuations in sheet cavitation volume is given in an earlier report, BBN Tech Memo No. 319, and will not be repeated here.

Descriptors:

• *MARINE PROPELLERS
• *CAVITATION NOISE
• PITCH(INCLINATION)
• SHIP NOISE
• WAKE
• MERCHANT VESSELS
• AMBIENT NOISE
• OCEAN ENVIRONMENTS
• BACKGROUND NOISE
• PROPELLER BLADES
• LOW FREQUENCIES
• CAMBER

Subject Categories:

• Marine Engineering
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE