Investigation of Hull Excitation Characteristics on CFAV QUEST

Abstract

The NSMB Co-operative Research Ships organization is investigating various aspects of hull excitation from highly skewed propellers. As part of this effort DREA measured hull excitations and made concurrent cavitation observations onboard CFAV QUEST. Results from these are presented and discussed. Varying amounts of sheet, leading edge vortex, tip vortex and hub vortex cavitation were observed. Bursting of the vortex cavitation was prominent in many cases. As ship speed and the amount of cavitation increased, so did the level of the higher harmonics of blade rate in the hull excitation spectra. There was some limited correlation between the appearance of the different forms of cavitation and the appearance of specific harmonics in the hull excitation. There was also data that indicated that no simple correlation would be possible. For instance, the harmonics at five and six times blade rate depended on the amount rather than the nature of the cavitation.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1998
Accession Number
ADA346182

Entities

People

  • James L. Kennedy

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Sensors

DTIC Thesaurus Topics

  • Bubbles
  • Classification
  • Frequency
  • Frequency Bands
  • Leading Edges
  • Marine Propellers
  • Measurement
  • Observation
  • Pressure Transducers
  • Propeller Blades
  • Propellers
  • Propulsion Systems
  • Research Ships
  • Security
  • Ships
  • Spectra
  • Standards

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Marine Hydrodynamics
  • Theoretical Analysis.