VIBRATION MEASUREMENTS ON PORT PROPULSION SYSTEM OF USNS POINT BARROW (T-AKD 1)

Vibrations were measured on the port propulsion system of USNS POINT BARROW (T-AKD 1) to determine the cause of an engine casualty. Large torque variations of the propeller shaft occurred at very low RPM and generated thrust variations. These vibrations are probably self-excited by large binding for...

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Bibliographic Details
Main Authors: Buchmann,Erich, Jasper,Norman H.
Other Authors: DAVID TAYLOR MODEL BASIN WASHINGTON D C STRUCTURAL MECHANICS LAB
Format: Text
Language:English
Published: 1958
Subjects:
Marine Engineering
*CARGO SHIPS
VIBRATION
SHIP TURBINES
MARINE PROPULSION
FAILURE
TURBINE COMPONENTS
MEASUREMENT
Point Barrow
Online Access:http://www.dtic.mil/docs/citations/AD0650550
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0650550
Description
Summary:Vibrations were measured on the port propulsion system of USNS POINT BARROW (T-AKD 1) to determine the cause of an engine casualty. Large torque variations of the propeller shaft occurred at very low RPM and generated thrust variations. These vibrations are probably self-excited by large binding forces at the shaft bearings. Vibration resonances at turbine and double-turbine frequencies occurred at the turbine housing at about 140 shaft RPM and are probably excited by unbalance in the turbine system. The magnitudes of other measured vibrations fall within a range usually acceptable on ships. Vibration levels on the turbine and gear case of the starboard propulsion system, where measured, indicated no unbalance in this system. (Author)

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