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Measurements and modeling of the transient acoustic field at impacted plates
ENST, Signal Department.
ENST, Signal Department.
Luleå tekniska universitet.
1998 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, no 5, 2814-1815 p.Article in journal (Refereed)
Abstract [en]

A comparison between measured and simulated transient acoustic fields generated by thin impacted plates is reported. The plate is modeled by using finite difference methods and the radiated pressure is obtained by solving the Rayleigh integral [Ch. Lambourg and A. Chaigne, J. Acoust. Soc. Am. 101(A) (1997)]. The results are evaluated in the form of the spatial pressure distribution at instants short after the excitation. Experimentally, a lead bullet (0.5 g, 100 m/s) is fired towards a cantilever steel plate (300×30×1 mm). The duration of the impact is estimated by using a high-speed camera that can register several million frames per second. An interferometric comparison of the change in optical path length of two holographic recordings, captured before and shortly after the impact, gives a 2-D projection of the acoustic field. A double-pulsed ruby laser, emitting light pulses of short duration (30 ns), is used as light source [S. Schedin, A. O. Waahlin, and P. Gren, J. Acoust. Soc. Am 99, 700-705 (1996)]. A high degree of similarity is observed between measured and simulated sound field, except in the close vicinity of the impact point. It is presumed that the discrepancies are due to nonlinear effects which are not included in the model

Place, publisher, year, edition, pages
1998. no 5, 2814-1815 p.
Research subject
Experimental Mechanics
URN: urn:nbn:se:ltu:diva-39785DOI: 10.1121/1.421579Local ID: ea90cc00-49c0-11de-93f6-000ea68e967bOAI: diva2:1013303
International Congress on Acoustics : 22/06/1998 - 26/06/1998
Godkänd; 1998; Bibliografisk uppgift: Volumne: 103; 20090526 (andbra); Konferensartikel i tidskriftAvailable from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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