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Reconstruction of Vibro-Acoustic Responses of a Baffled Plate Using Helmholtz Equation Least Squares Method

[+] Author Affiliations
Logesh Kumar Natarajan, Sean F. Wu

Wayne State University, Detroit, MI

Paper No. IMECE2009-13201, pp. 505-511; 7 pages
doi:10.1115/IMECE2009-13201
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 15: Sound, Vibration and Design
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4388-8 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

Vibro-acoustic responses of a vibrating rectangular plate were reconstructed using Helmholtz Equation Least Squares (HELS) method. The experiments were conducted on baffled rectangular plates of different aspect ratios with free as well as clamped boundary conditions under point force excitations via random and chirp sine signals. The radiated acoustic pressures were measured using a planar array of microphones at a very close distance to the plate surface, and taken as input to the HELS codes. The normal surface velocity distributions were reconstructed using HELS and compared against the benchmark data obtained using a laser vibrometer. Good agreements were obtained for both free and clamped boundary conditions. Finally, theoretical structural modes of the plate were compared against those obtained by HELS reconstruction and experimental modal analysis (EMA) for establishing their effectiveness in identifying closely coupled modes.

Copyright © 2009 by ASME
Topics: Acoustics , Equations

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