Ray shooting, eigenray search, and complex resonances for submerged structures

I-Tai Lu, Y. Q. Yao

Research output: Contribution to journalArticle

Abstract

The general theory of a ray-mode approach for time-harmonic responses and a wavefront-resonant approach for transient responses of submerged structures [I-T. Lu, J. Acoust. Soc. Am. 99, 114-132 (1996)] is applied to a prototype structure consisting of a cylindrical pipe, hemispherical endcaps, a bulkhead, and a rib. The acoustic scattering returns are synthesized systematically in terms of angular spectra of surface modes of the structural elements where bookkeeping of various spectral objects such as ray, collective ray, modes, ray mode, resonance, etc. can be maintained. Ray shooting and eigenray searching procedures for the guided modes of structural elements are derived. An approximate solution for the resonances of the global submerged structure is also obtained. Numerical examples of typical ray trajectories of these guided modes, travel times of wavefronts, and complex frequencies of resonances are presented.

Original languageEnglish (US)
Pages (from-to)66-76
Number of pages11
JournalJournal of the Acoustical Society of America
Volume101
Issue number1
DOIs
StatePublished - Jan 1997

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rays
bulkheads
acoustic scattering
transient response
travel
prototypes
Ray
trajectories
harmonics

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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Ray shooting, eigenray search, and complex resonances for submerged structures. / Lu, I-Tai; Yao, Y. Q.

In: Journal of the Acoustical Society of America, Vol. 101, No. 1, 01.1997, p. 66-76.

Research output: Contribution to journalArticle

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