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

• 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

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)