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- W3023555445 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 in a nonhomogeneous variable property two-dimensional wave equation. This eliminated the necessity of finding the boundary conditions between the different materials. For a two media region consisting of part air (in the duct) and part bulk absorber (in the wall), a model was used to describe the bulk absorber properties in two directions. An experiment to verify the numerical theory was conducted in a rectangular duct with no flow and absorbing material mounted on one wall. Changes in the sound field, consisting of planar waves was measured on the wall opposite the absorbing material. As a function of distance along the duct, fairly good agreement was found in the standing wave pattern upstream of the absorber and in the decay of pressure level opposite the absorber." @default.
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- W3023555445 date "1987-08-17" @default.
- W3023555445 modified "2023-09-26" @default.
- W3023555445 title "A finite element model for wave propagation in an inhomogeneous material including experimental validation" @default.
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- W3023555445 doi "https://doi.org/10.2514/6.1987-2741" @default.
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