ACOUSTIC RADIATION FROM A DOUBLE HULL STRUCTURE

Acoustic radiation characteristics are determined for a double shell structure, consisting of two circular cylindrical shells separated by, and immersed in, an acoustic medium. The fluid is assumed to be inviscid and compressible and its motion is governed by the wave equation; the shell response is determined by using classical shell theory. Coupling of these equations arise from two interface conditions, namely: (1) the fluid pressure is exerted on the shell, and (2) the radial fluid and shell velocities are equal. The results indicate that in certain regions of the frequency ratio (omega times L/pi), the pressure in the outer fluid at the interface was somewhat greater for the double shell than for the single shell. However, the infinite response at the nonradiating frequency (omega equals omega sub 1) no longer was present for the double shell. Furthermore, the introduction of structural damping did result in improved transmission loss properties for the double shell. Finally, it should be pointed out that greatly improved transmission loss properties can be expected for the double shell construction by choosing the appropriate combination of materials for the inner and outer shells. Such a parametric study will be forthcoming in the future.

• Corporate Authors:

  Brooklyn Polytechnic Institute

  333 Jay Street
  Brooklyn, NY  United States  11201
• Authors:
  • Pollack, M L
  • Klosner, J M
• Publication Date: 1972-2

Media Info

• Features: Figures; References;
• Pagination: 43 p.

Subject/Index Terms

• TRT Terms: Acoustic radiation; Construction; Noise; Shells (Structural forms); Structural analysis
• Old TRIS Terms: Double shell construction; Shell theory; Structure-borne noise
• Subject Areas: Construction; Design; Environment; Marine Transportation; Materials;

Filing Info

• Accession Number: 00033688
• Record Type: Publication
• Source Agency: Ship Structure Committee
• Report/Paper Numbers: NR-064-427
• Contract Numbers: N00014-67-A-04380006
• Files: TRIS
• Created Date: Sep 27 1973 12:00AM