SOME HYDRODYNAMIC CONSIDERATIONS OF PROPELLER INDUCED SHIP VIBRATIONS
A survey of some hydrodynamic aspects associated with propeller induced vibrations is given. A very important parameter is the increasing propeller load, which causes the structure of the effective wake field to differ essentially from the nominal wake field. This is strongly related with the increased interaction between hull and propeller. The non-homogeneity of the wake field induces hydrodynamic excitations via the running propeller. These excitations on the hull structure and on the propeller shaft, generate noise and vibration problems. Vibrations on board ships are therefore often effectively reduced by affecting these excitations. This can be done fruitfully by changing the wake field. For existing ships, efficient devices to realize this are based on the effect of the propeller on the flow ahead, which effect increases with propeller load. Such devices are, for example, partial stern tunnels and fins. No negative effects of such devices on the propulsive performance need occur. Due to the dominant role of the effective wake field, which still cannot be measured accurately, theoretical investigations, using the nominal wake field as input, are therefore susceptible to inaccuracies.
- Presented at the Ship Vibration Symposium sponsored by The Ship Structure Committee and The Society of Naval Architects and Marine Engineers, Arlington, Virginia, October 16-17, 1978.
Society of Naval Architects and Marine Engineers601 Pavonia Avenue
Jersey City, NJ USA 07306-2907
- Hylarides, S
- Publication Date: 1978
- Features: References;
- Pagination: 16 p.
- TRT Terms: Cavitation (Mechanics); Cavitation erosion; Hulls; Hydrodynamics; Mechanical loads; Propellers; Ships; Stresses; Vibration; Wakes
- Old TRIS Terms: Cavitating propellers; Hull propeller interaction; Hull vibration; Propeller induced vibration; Propeller loading; Wake induced stresses
- Subject Areas: Design; Hydraulics and Hydrology; Marine Transportation; Vehicles and Equipment;
- Accession Number: 00183163
- Record Type: Publication
- Source Agency: Society of Naval Architects and Marine Engineers
- Report/Paper Numbers: Proceeding
- Files: TRIS
- Created Date: Oct 31 1978 12:00AM