Effect of vibrating sub-structure on acoustic radiation from a cylindrical shell

J. D. Achenbach, J. Bjarnason, T. Igusa

Research output: Contribution to journalConference article

Abstract

The presence of a sub-structure in a cylindrical shell gives rise to dynamic interactions, including resonance effects, which have an influence on the radiated acoustic field. The lowest mode of the sub-structure may interact vigorously with a higher order mode of the shell. In this paper a frequency window method is used to analyze the forced motion of the immersed shell/sub-structure system in a frequency range of interest, namely one corresponding to a higher order mode of the shell. A particular example is concerned with a springmass system, which is attached to the shell. Three cases of forced harmonic motion are considered. The radiated energy is computed as a function of the frequency. It is shown that excitation at a relatively high frequency, corresponding to a higher order mode, stimulates energy radiation into the acoustic medium via lower order modes. The radiated energy for the shell/sub-structure system is compared with that for a shell without an oscillator subjected to the same input force.

Original languageEnglish (US)
JournalAmerican Society of Mechanical Engineers (Paper)
StatePublished - Dec 1 1990
Externally publishedYes
EventProceedings of the Winter Annual Meeting - Dallas, TX, USA
Duration: Nov 25 1990Nov 30 1990

ASJC Scopus subject areas

  • Mechanical Engineering

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