SOME EXPERIENCES FROM VIBRATION EXCITATION TESTS IN THE SSPA LARGE CAVITATION TUNNEL
Cavitation Tunnel No. 2 at the SSPA (the Swedish State Shipbuilding Experimental Tank at Gothenburg) has been in operation since 1969. The Author describes the tunnel, including some modifications that have been incorporated since it was brought into use, and discusses its design philosophy. The experimental techniques used with the low-speed section of the tunnel, and methods of analysing the results, are described with particular reference to propeller-excited vibration and to the pressure fluctuations at a reference point on the ship-model above the propeller, and the significance of such measurements for the prediction of vibration on the full-scale ship is examined. The Author also briefly discusses unconventional propellers and stern fins as devices for reducing the amplitudes of the pressure fluctuations. Some cavitation-tunnel results are presented that indicate the respective amplitude-reductions through unloading the blade tips, skew-back, and fitting stern fins. Order from BSRA as No. 52,511.
- Paper presented at the Symposium on Propeller Induced Ship Vibration, London, 11-13 December 1979.
Royal Institution of Naval Architects, England10 Upper Belgrave Street
London SW1X 8BQ, England
- Johnsson, C A
- Publication Date: 1979
- Features: References;
- Pagination: 10 p.
- TRT Terms: Atmospheric pressure; Cavitation (Mechanics); Excitation; Fins (Aircraft); Measurement; Propellers; Ships; Stabilizers; Structural models; Tests; Towing devices; Vibration
- Uncontrolled Terms: Ship models
- Old TRIS Terms: Fin stabilizers; Pressure fluctuations; Propeller excitation; Propeller vibration; Towing tests; Vibration measurement
- Subject Areas: Bridges and other structures; Marine Transportation; Vehicles and Equipment;
- Accession Number: 00311533
- Record Type: Publication
- Source Agency: British Ship Research Association
- Report/Paper Numbers: Paper No. 4 Conf Paper
- Files: TRIS
- Created Date: Jun 26 1980 12:00AM