| Direct Measurement of the Mode O Turbulent Boundary Layer Wall Pressure and Wall Shear Stress Spectra Using Air-Backed and Oil-Filled Multichannel Wavenumber Filters |
10 MAY 1999 |
153 pages |
| Authors:
Mark S. Peloquin; NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI
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 | This report describes research that resulted in the first direct multichannel measurements of the wall pressure and wall shear stress spectra beneath a turbulent boundary layer formed over a long, thin cylinder in an axial flow field. These measurements, processed as wavenumber-frequency spectra, were made with a multichannel array composed of an air-backed cylinder structure and a 32-channel aperture of PVDF film sensors having an axisymmetric ... |
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| Method and Apparatus for Frequency Filtering Using an Elastic, Fluid- Filled Cylinder |
29 MAY 97 |
18 pages |
| Authors:
Mark S. Peloquin; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A method and system are provided for frequency filtering compressional wave energy. An elastic cylinder is filled with a fluid that is selected based on a fluid density p and a dilatational wave phase velocity ci thereof. When the elastic cylinder so-filled is subjected to a compressional wave propagating in a fluid environment, a first radial resonance frequency of the elastic cylinder is controlled by the fluid density p and ... |
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| A Closed-Form Dynamic Elasticity Solution to the Fluid/Structure Interaction Problem of a Two-Layer Infinite Viscoelastic Cylinder with Inner and Outer Fluid Loading Subject to Forced Harmonic Excitation |
29 DEC 95 |
264 pages |
| Authors:
Mark S. Peloquin; NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI
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| This report documents an exact closed-form solution to the problem of a two-layer viscoelastic solid infinite cylinder that is immersed in an infinite ideal inviscid fluid and contains an infinite ideal inviscid fluid within its diameter. The viscoelasticity is modeled with structural damping, which is incorporated by the use of a complex modulus of elasticity. The composite system is subject to forced harmonic vibration at the outer solid/fluid interface. The ... |
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| FORTRAN Algorithms for the Three-Dimensional Solution of Two-Layer Solid and Hollow Cylinder Dynamic Elasticity Problems With and Without Fluids |
29 NOV 95 |
254 pages |
| Authors:
Mark S. Peloquin; NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI
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| This document contains FORTRAN algorithms for the numerical evaluation of exact closed form solutions to four fluid/structure interaction mathematical problems that are modeled as cylinders and fluids. The cylinders (infinitely long in the longitudinal x-direction) are modeled as three- dimensional linear viscoelastic solids, and the fluids are treated as inviscid. The outer fluid extends to infinity in the radial r-direction; the inner fluid (contained within the hollow cylinder) is bounded ... |
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| A Three-Dimensional Dynamic Elasticity Solution for Wave Propagation in a Two-Layered Infinite Viscoelastic Solid Cylinder With Outer Fluid Loading |
31 AUG 95 |
112 pages |
| Authors:
Mark S. Peloquin; NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV NEW LONDON CT NEW LONDON DETACHMENT
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| The research presented in this report provides an exact closed form solution to the problem of a two layered viscoelastic solid infinite cylinder immersed in an infinite ideal inviscid fluid. Damping is incorporated by the use of a complex modulus of elasticity. The composite system is subject to forced harmonic vibration at the solid fluid interface. The response to both axisymmetric and nonaxisymmetric excitations is derived. A three dimensional dynamic ... |
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| Forced Harmonic Vibration of the Generally Orthotropic Cylindrical Shell with Inner and Outer Fluid Loading |
25 NOV 92 |
142 pages |
| Authors:
Mark S. Peloquin; NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI
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| This report describes a modeled system comprised of an infinite shell with both inner and outer fluids subject to forced harmonic vibration in the longitudinal (x) and circumferential (0) directions. Two excitations are applied to the outer shell surface: normal pressure, Po, and longitudinal shear stress, Px. The equations of motion are derived, from first principles, for an elastic shell, including a full treatment of bending and rotatory inertia. The ... |
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