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There are a total of 27 record(s) matching your query.
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A finite element model for wave propagation in an inhomogeneous material including experimental validation
Author(s): Baumeister, Kenneth J.; Dahl, Milo D.
Abstract: A finite element model was developed to solve for the acoustic pressure field in a nonhomogeneous region. The derivations from the governing equations assumed that the material properties could vary with position resulting ...
NASA Center: Glenn Research Center
Publication Year: 1987
Added to NTRS: 2005-10-13
Accession Number: 87N25821; Document ID: 19870016388; Report Number: E-3471, NAS 1.15:100149, NASA-TM-100149
Finite element analysis of electromagnetic propagation in an absorbing wave guide
Author(s): Baumeister, Kenneth J.
Abstract: Wave guides play a significant role in microwave space communication systems. The attenuation per unit length of the guide depends on its construction and design frequency range. A finite element Galerkin formulation has ...
NASA Center: Glenn Research Center
Publication Year: 1986
Added to NTRS: 2005-10-13
Accession Number: 87N18391; Document ID: 19870008958; Report Number: E-3133, NAS 1.15:88866, NASA-TM-88866
Electromagnetic propagation in PEC and absorbing curved S-ducts
Author(s): Baumeister, Kenneth J.
Abstract: A finite-element Galerkin formulation has been developed to study transverse magnetic (TM) wave propagation in 2-D S-curved ducts with both perfectly conducting and absorbing walls. The reflection and transmission at the ...
NASA Center: Glenn Research Center
Publication Year: 1988
Added to NTRS: 2005-10-13
Accession Number: 88N19698; Document ID: 19880010314; Report Number: E-3507, NAS 1.15:100833, NASA-TM-100833
Calculations of Wall Effects on Propeller Noise
Author(s): Baumeister, Kenneth J.; Eversman, Walter
Abstract: Reverberations affect sound levels in wind tunnels. Report describes calculations of acoustic field of propeller in wind tunnel having walls of various degrees of softness. Understanding provided by this and related studies ...
NASA Center: Glenn Research Center
Publication Year: 1987
Added to NTRS: 2005-09-30
Accession Number: 87B10490; Document ID: 19870000490; Report Number: LEW-14516
Discretization formulas for unstructured grids
Author(s): Baumeister, Kenneth J.
Abstract: The Galerkin weighted residual technique using linear triangular weight functions is employed to develop finite difference formula in cartesian coordinates for the Laplacian operator, first derivative operators and the ...
NASA Center: Glenn Research Center
Publication Year: 1988
Added to NTRS: 2005-08-25
Accession Number: 89N10242; Document ID: 19890000871; Report Number: E-4094, NAS 1.15:101298, NASA-TM-101298
Finite Difference Time Marching in the Frequency Domain: A Parabolic Formulation for Aircraft Acoustic Nacelle Design
Author(s): Baumeister, Kenneth J.; Kreider, Kevin L.
Abstract: An explicit finite difference iteration scheme is developed to study harmonic sound propagation in aircraft engine nacelles. To reduce storage requirements for large 3D problems, the time dependent potential form of the ...
NASA Center: Glenn Research Center
Publication Year: 1996
Added to NTRS: 2005-08-25
Accession Number: 97N11159; Document ID: 19970001340; Report Number: E-9403, NAS 1.15:106839, NASA-TM-106839
Acoustic wave propagation in heterogeneous structures including experimental validation
Author(s): Baumeister, Kenneth J.; Dahl, Milo D.
Abstract: A finite element model was developed to solve for the acoustic pressure and energy fields in a heterogeneous suppressor. The derivations from the governing equations assumed that the material properties could vary with ...
NASA Center: Glenn Research Center
Publication Year: 1989
Added to NTRS: 2005-08-25
Accession Number: 89N19965; Document ID: 19890010594; Report Number: E-4622, NAS 1.15:101486, NASA-TM-101486
Acoustic propagation in curved ducts with extended reacting wall treatment
Author(s): Baumeister, Kenneth J.
Abstract: A finite-element Galerkin formulation was employed to study the attenuation of acoustic waves propagating in two-dimensional S-curved ducts with absorbing walls without a mean flow. The reflection and transmission at the ...
NASA Center: Glenn Research Center
Publication Year: 1989
Added to NTRS: 2005-08-25
Accession Number: 89N25670; Document ID: 19890016299; Report Number: E-4880, NAS 1.15:102110, NASA-TM-102110
Modal element method for scattering of sound by absorbing bodies
Author(s): Baumeister, Kenneth J.; Kreider, Kevin L.
Abstract: The modal element method for acoustic scattering from 2-D body is presented. The body may be acoustically soft (absorbing) or hard (reflecting). The infinite computational region is divided into two subdomains - the bounded ...
NASA Center: Glenn Research Center
Publication Year: 1992
Added to NTRS: 2005-08-25
Accession Number: 92N28984; Document ID: 19920019741; Report Number: E-7126, NAS 1.15:106009, NASA-TM-106009
Scattering cross section of sound waves by the modal element method
Author(s): Baumeister, Kenneth J.; Kreider, Kevin L.
Abstract: #he modal element method has been employed to determine the scattered field from a plane acoustic wave impinging on a two dimensional body. In the modal element method, the scattering body is represented by finite elements, ...
NASA Center: Glenn Research Center
Publication Year: 1994
Added to NTRS: 2005-08-25
Accession Number: 94N37308; Document ID: 19940032800; Report Number: E-8989, NAS 1.15:106667, NASA-TM-106667
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