The use of modal tailoring to minimize the radiated sound power of vibrating shells: Theory and experiment

Eric Constans, G. H. Koopmann, A. D. Belegundu

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

A numerical design tool is presented for minimizing radiated sound power from a vibrating shell structure using a material tailoring approach. A finite element method using shell elements is used to predict the vibration response of the shell. The sound power generated by the shell under a harmonic force input is computed with a lumped parameter/wave superposition method. A simulated annealing algorithm is used to find optimal point mass distributions for minimum sound power. It is shown that optimal designs are achieved through converting certain mode shapes of the shell into "weak radiators", i.e., modes with low net volume velocities. Close agreement is found between predicted noise levels and experimental measurements, thus providing initial validation of the method as an effective means of finding optimal structural designs for minimum sound power.

Original languageEnglish (US)
Pages (from-to)335-350
Number of pages16
JournalJournal of Sound and Vibration
Volume217
Issue number2
DOIs
StatePublished - Oct 22 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Mechanics of Materials
  • Mechanical Engineering

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