title: Directionality of flexural intensity in orthotropic plates.
abstract: This work investigates composite plates and their ability to direct flexural intensity, which has important implications for noise and vibration control. It is well known that a composite plate supports a flexural wave whose wavenumber depends strongly on its angle of propagation. This suggests that a composite plate will direct more flexural intensity in some directions than others. The present work considers a thin multi-layered plate in which each layer is constructed from an orthotropic material and has a chosen orientation relative to the other layers. Such an approach may be used to design highly directive structures. An analysis is presented in which a two-dimensional Fourier transform is analytically applied to the equation of motion, yielding algebraic expressions for displacements and stress resultants. Next, a two-dimensional discrete inverse Fourier transform is applied to compute displacements and stress resultants at discrete locations. Flexural intensity is computed at these locations.
authors.affiliation: NAVSEA Newport, Newport, Rhode Island 02841-5047, USA. elizabeth.magliula@navy.mil
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Magliula
authors.forename: J Gregory
authors.initials: JG
authors.lastname: McDaniel
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D003198:Computer Simulation; D004867:Equipment Design; D005583:Fourier Analysis; D008962:Models, Theoretical; D009622:Noise / Q000517:prevention & control*; D009716:Numerical Analysis, Computer-Assisted; D014732:Vibration