The use of modal tailoring to minimize the radiated sound power of vibrating shells

Theory and experiment

E. W. Constans, G. H. Koopmann, Ashok D. Belegundu

Research output: Contribution to journalArticle

42 Citations (Scopus)

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

Fingerprint

shell theory
Acoustic waves
acoustics
Experiments
structural design
modal response
simulated annealing
Radiators
radiators
Simulated annealing
mass distribution
Structural design
Vibrations (mechanical)
finite element method
harmonics
Finite element method
vibration

All Science Journal Classification (ASJC) codes

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

Cite this

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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.",
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The use of modal tailoring to minimize the radiated sound power of vibrating shells : Theory and experiment. / Constans, E. W.; Koopmann, G. H.; Belegundu, Ashok D.

In: Journal of Sound and Vibration, Vol. 217, No. 2, 22.10.1998, p. 335-350.

Research output: Contribution to journalArticle

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