STUDY OF NOISE DUE TO PROPELLER CAVITATION

The likelihood of the presence of a naval vessel being detected by underwater means may depend upon the high-frequency noise associated with the vessel's propeller cavitation. The ability to predict, from model tests, the ship speed at which cavitation is initiated, together with the subsequent development of cavitation and noise with increasing ship speed, is thus a serious problem, and has been the object of full-scale tests and of cavitation-tunnel tests at the CEIMM <the Italian Navy's hydrodynamic experimental centre>. These tests have enabled a tunnel/sea correlation law to be derived. The Authors here examine the role of the various parameters that influence the measurement of noise in this cavitation tunnel, and discuss the relevant experimental methods in use at the CEIMM <the merits of of the tunnel/sea correlation itself are not examined>. It is concluded that the initial results of the CEIMM tests show that the cavitation tunnel and its present instrumentation are reliable for the relative evaluation of the noise levels associated With the various cavitation phenomena; however, some proposals, by the CEIMM, for a more thorough study of this noise problem, and of tunnel/sea correlation, are mentioned.

• Supplemental Notes:
  • Marina Ital., 80 <1982>, p.26 <No.6-7> (7 pp., 4 ref., 13 graphs, 3 diag.)
• Authors:
  • Gregoretti, V
  • Accardo, L
  • Marino, M
• Publication Date: 1982

Language

• Italian

Subject/Index Terms

• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00683946
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM