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Tytuł pozycji:

Ultrasonic pulsed beam interaction with a fluid-loaded elastic plate: Experimental validation.

Tytuł:
Ultrasonic pulsed beam interaction with a fluid-loaded elastic plate: Experimental validation.
Autorzy:
Zeroug, Smaine
Stanke, Fred E.
Źródło:
Journal of the Acoustical Society of America; 1996, Vol. 100 Issue 3, p1349-1356, 8p
Czasopismo naukowe
In this paper, the analytical model developed in the preceding paper [S. Zeroug and F. E. Stanke, ''Ultrasonic pulsed beam interaction with a fluid-loaded elastic plate: Theory,'' J. Acoust. Soc. Am. 100, xx-xx (1996)] is numerically implemented and experimentally validated for ultrasonic transducer-excited pulsed beams interacting with a fluid-loaded elastic plate. Using flat piston ultrasonic transducers, two modes of operation are considered: (1) a transmission mode using a pair of transducers and (2) a reflection mode at normal incidence with a single transducer (i.e., pulse echo). A first algorithm, based on real-axis integration (RAI) of the original beam integrals, is used to generate reference data in both modes of operation and is validated by comparison with experiments on various plates. A more computationally efficient algorithm, based on the multiply reflected asymptotic-beam (MRAB) approach, and compared with experiments and RAI data, works accurately for signals from thick plates (in terms of the plate compressional wavelength at the signal center frequency). In particular, it validates the higher-order asymptotic expansion for shear waves excited at normal incidence. However, the MRAB algorithm fails for thin plates mainly in the low-frequency range of the signal. The results attained in this study suggest a rule of thumb that scattered signals comprised of resolvable arrivals are amenable to modeling with the MRAB approach. © 1996 Acoustical Society of America. [ABSTRACT FROM AUTHOR]
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