A METHOD FOR CALCULATING THE SOUND ATTENUATION IN A SILENCER, CONSISTING OF FINITE SECTIONS OF BULK REACTING LINING IN A CYLINDRICAL DUCT WITH MEAN FLOW

A general method is presented for taking into account the reflection, transmission, and propagation of all relevant modes in a silencer, consisting of finite sections of bulk-reacting lining in a cylindrical duct with gas flow. The general problem is thus reduced to the study of two standard problems. The first is the well known, but not yet completely worked, throw problem of an infinite duct with bulk-reacting lining and flow. Some numerical results are presented which stress the importance of an often overlooked phenomenon in this connection - the so called amplifying modes. The second problem concerns the reflection and transmission properties of a junction between two different sections of the duct. This problem is solved with integral equation methods from the theory of electromagnetic wave guides.

  • Corporate Authors:

    Chalmers University of Technology, Sweden

    Institute of Theoretical Physics, Fack
    S-402 20 Goeteborg 5,   Sweden 
  • Authors:
    • Brander, O
    • NILSSON, B
  • Publication Date: 1977-9-30

Media Info

  • Pagination: 88 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00185749
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: CTH-ITP-TMF-77-1
  • Files: TRIS
  • Created Date: Dec 29 1979 12:00AM