Accession Number:

AD0650550

Title:

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

Descriptive Note:

Corporate Author:

DAVID TAYLOR MODEL BASIN WASHINGTON D C STRUCTURAL MECHANICS LAB

Personal Author(s):

Report Date:

1958-12-01

Pagination or Media Count:

27.0

Abstract:

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

Subject Categories:

  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE