Vibro- Acoustic measurements and simulations of a rib-framed honeycomb core sandwich panel

Stephen A. Hambric, Micah Shepherd, Carl May, Royce Snider

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

Modes of resonance, mobilities, radiated sound, and sound power transmission loss have been measured and simulated for a rib-framed honeycomb core sandwich panel with carbon-fiber face sheets. The measured modal wavenumbers and resonance frequencies are used to confirm analytic estimates of the effective flexural sound speeds in the panel. The flexural wavespeeds are strongly affected by the honeycomb core shear properties, and become supersonic at about 700 Hz. The mode shapes of the panel section between the frames resemble those of simply supported plates. Numerical simulations of resonance frequencies made with a Finite Element (FE) model match measurements within 10%. The numerically extracted modes are used to compute point and surface averaged mobilities, which compare very well with those measured on the physical structure, and to infinite panel analytic calculations. The FE mobilities are then combined with an acoustic boundary element (BE) model to calculate radiated sound transfer functions which are further used to compute a virtual sound power transmission loss for acoustic diffuse field loading. The virtual transmission loss (VTL) calculations are within 3 dB of measurements made of the physical panel in NASA's Structural Acoustic Loads and Transmission (SALT) facility. Copyright

Original languageEnglish (US)
Title of host publication42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013
Subtitle of host publicationNoise Control for Quality of Life
PublisherOAL-Osterreichischer Arbeitsring fur Larmbekampfung
Pages4059-4068
Number of pages10
ISBN (Print)9781632662675
StatePublished - Jan 1 2013
Event42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013 - Innsbruck, Austria
Duration: Sep 15 2013Sep 18 2013

Publication series

Name42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life
Volume5

Other

Other42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013
CountryAustria
CityInnsbruck
Period9/15/139/18/13

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

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    Hambric, S. A., Shepherd, M., May, C., & Snider, R. (2013). Vibro- Acoustic measurements and simulations of a rib-framed honeycomb core sandwich panel. In 42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life (pp. 4059-4068). (42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life; Vol. 5). OAL-Osterreichischer Arbeitsring fur Larmbekampfung.