Acoustic Pressure Waves in Vibrating 3-D Laminated Beam-Plate Enclosures
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Date
2009
Authors
Osheku, C.A.
Olunloyo, V.O.
Damisa, O.
Akano, T.T.
Journal Title
Journal ISSN
Volume Title
Publisher
Advances in Acoustics and Vibration in Hindawi Publishing Corporation
Abstract
The effect of structural vibration on the propagation of acoustic pressure waves through a cantilevered 3-D laminated beam-plate enclosure is investigated analytically. For this problem, a set of well-posed partial differential equations governing the vibroacoustic wave interaction phenomenon are formulated and matched for the various vibrating boundary surfaces. By employing integral
transforms, a closed form analytical expression is computed suitable for vibroacoustic modeling, design analysis, and general aerospace defensive applications. The closed-form expression takes the form of a kernel of polynomials for acoustic pressure waves showing the influence of linear interface pressure variation across the axes of vibrating boundary surfaces. Simulated results demonstrate how the mode shapes and the associated natural frequencies can be easily computed. It is shown in this paper that acoustic pressure waves propagation are dynamically stable through laminated enclosures with progressive decrement in interfacial pressure distribution under the influence of high excitation frequencies irrespective of whether the induced flow is subsonic, sonic, supersonic, or hypersonic. Hence, in practice, dynamic stability of hypersonic aircrafts or jet airplanes can be further enhanced by replacing their noise transmission systems with laminated enclosures.
Description
Staff publications
Keywords
Structural vibration , Acoustic pressure , Dynamic stability , Vibroacoustics , Research Subject Categories::TECHNOLOGY
Citation
Osheku, C. A., Olunloyo, V. O., Damisa, O., & Akano, T. T. (2009). Acoustic Pressure Waves in Vibrating 3-D Laminated Beam-Plate Enclosures. Advances in Acoustics and Vibration, 2009.