Fundamental issues relative to structural vibration and to scattering of sound from structures with imprecisely known internals are explored, with the master structure taken as a rectangular plate in a rigid baffle, which faces an unbounded fluid medium on the external side. On the internal side is a fuzzy structure, consisting of a random array of point-attached spring-mass systems. The theory predicts that the fuzzy internal structure can be approximated by a statistical average in which the only relevant property is a function mF(Ω) which gives a smoothed-out total mass, per unit plate area, of all those attached oscillators which have their natural frequencies less than a given value Ω. The theory also predicts that the exact value of the damping in the fuzzy structure is of little importance, because the structure, even in the limit of zero damping, actually absorbs energy with an apparent frequency-dependent damping constant proportional to dmF(W)/dω incorporated into the dynamical description of the master structure. A small finite value of damping within the internals will cause little appreciable change to this limiting value.
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July 1995
Research Papers
Fundamental Structural-Acoustic Idealizations for Structures with Fuzzy Internals
A. D. Pierce,
A. D. Pierce
Department of Aerospace and Mechanical Engineering, Boston University, 110 Cummington Street, Boston, MA 02215
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V. W. Sparrow,
V. W. Sparrow
157 Hammond Building, Pennsylvania State University, University Park, PA 16802
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D. A. Russell
D. A. Russell
157 Hammond Building, Pennsylvania State University, University Park, PA 16802
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A. D. Pierce
Department of Aerospace and Mechanical Engineering, Boston University, 110 Cummington Street, Boston, MA 02215
V. W. Sparrow
157 Hammond Building, Pennsylvania State University, University Park, PA 16802
D. A. Russell
157 Hammond Building, Pennsylvania State University, University Park, PA 16802
J. Vib. Acoust. Jul 1995, 117(3A): 339-348 (10 pages)
Published Online: July 1, 1995
Article history
Received:
June 1, 1993
Online:
February 26, 2008
Citation
Pierce, A. D., Sparrow, V. W., and Russell, D. A. (July 1, 1995). "Fundamental Structural-Acoustic Idealizations for Structures with Fuzzy Internals." ASME. J. Vib. Acoust. July 1995; 117(3A): 339–348. https://doi.org/10.1115/1.2874456
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