EXPERIMENT ON REDUCTION OF PROPELLER EXCITED VIBRATORY FORCES AND MOMENTS OF A FISHING BOAT BY A WATERJET SYSTEM
One method that has been suggested for the reduction of propeller-excited vibration is the addition of a water jet. The Authors here discuss the application of this method to a fishing boat, and describe tests on a trawler model in which a water jet was installed. It is mentioned that most fishing vessels have pumping capacity that can be utilised in this way, and it may be possible to reduce the wake peak by fitting a water jet at the stern, directed towards the propeller. In the model tested, that of an ocean-going stern trawler, four circular jets were fitted in this position, directed towards the top of the propeller disc, and a pump was fitted inside the model. Results of these tests are presented in some detail. The water jet had a favourable effect; there was reduction of over 20% in thrust variation, and this was supported by theoretical calculations, measured velocity distribution being used in both cases. The estimated power required for such jets in the full-scale ship was about 82 hp, or about 3% of the main-engine output. Order from BSRA as No. 52,650.
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Corporate Authors:
Ship Research Institute, Tokyo
38-1, 6-chome, Shinkawa, Mitaka-shi
Tokyo, Japan -
Authors:
- Ueda, T
- Sugai, N
- Yokoo, N
- Publication Date: 1979-1
Language
- Japanese
Media Info
- Features: References;
- Pagination: p. 37
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Serial:
- Ship Research Institute, Report of
- Volume: 16
- Issue Number: 1
- Publisher: Ship Research Institute, Tokyo
Subject/Index Terms
- TRT Terms: Damping (Physics); Excitation; Fishing vessels; Performance; Propellers; Vibration; Water pumps; Waterjets
- Old TRIS Terms: Model testing; Propeller excitation; Propeller induced vibration; Waterjet pump performance
- Subject Areas: Marine Transportation; Vehicles and Equipment;
Filing Info
- Accession Number: 00314990
- Record Type: Publication
- Source Agency: British Ship Research Association
- Files: TRIS
- Created Date: Aug 27 1980 12:00AM