SELF-EXCITED VIBRATION OF PROPELLER NOZZLES EXPERIENCED ON OCEAN- GOING TUGBOATS, 2ND REPORT
Model experiments were performed to identify causes of inordinate propeller nozzle vibration experienced on ocean-going tugboats. The galloping was imputable to flow separation over the entire outside nozzle surface, which had induced a negative slope of the lift coefficient in reference to incident angle. To prevent the occurrence of galloping, recommended measures are: (1) In design, to select and specify nozzle profile and operating parameters such as to prevent total separation of flow over outside nozzle surface; (2) As a remedial measure, to ensure a vibration mode of large structural damping; (3) In service, to reduce ship speed, so as to lower the absolute value of negative hydrodynamic damping of the nozzle.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/05148499
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Supplemental Notes:
- Journal article
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Authors:
- Okamura, N
- Kumazaki, S
- Publication Date: 1985-12
Media Info
- Features: References;
- Pagination: 12 p.
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Serial:
- Journal of the Society of Naval Architects of Japan
- Volume: 158
- Issue Number: No.60
- ISSN: 0514-8499
Subject/Index Terms
- TRT Terms: Ocean going tugs; Vibration
- Uncontrolled Terms: Model tests
- Old TRIS Terms: Propeller nozzles
- Subject Areas: Marine Transportation; Vehicles and Equipment;
Filing Info
- Accession Number: 00648931
- Record Type: Publication
- Source Agency: Maritime Technical Information Facility
- Files: TRIS
- Created Date: Jul 21 1994 12:00AM