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Coupled be/fe/be approach for scattering from fluid-filled structures
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Everstine, Gordon C. Cheng, Raymond S. |
| Copyright Year | 1990 |
| Description | NASHUA is a coupled finite element/boundary element capability built around NASTRAN for calculating the low frequency far-field acoustic pressure field radiated or scattered by an arbitrary, submerged, three-dimensional, elastic structure subjected to either internal time-harmonic mechanical loads or external time-harmonic incident loadings. Described here are the formulation and use of NASHUA for solving such structural acoustics problems when the structure is fluid-filled. NASTRAN is used to generate the structural finite element model and to perform most of the required matrix operations. Both fluid domains are modeled using the boundary element capability in NASHUA, whose matrix formulation (and the associated NASTRAN DMAP) for evacuated structures can be used with suitable interpretation of the matrix definitions. After computing surface pressures and normal velocities, far-field pressures are evaluated using an asymptotic form of the Helmholtz exterior integral equation. The proposed numerical approach is validated by comparing the acoustic field scattered from a submerged fluid-filled spherical thin shell to that obtained with a series solution, which is also derived here. |
| File Size | 741934 |
| Page Count | 15 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900015333 |
| Archival Resource Key | ark:/13960/t7sn53c6c |
| Language | English |
| Publisher Date | 1990-04-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Scattering Pressure Distribution Acoustics Boundaries Pressure Sound Pressure Finite Element Method Domains Thin Walled Shells Integral Equations Sound Fields Far Fields Spherical Shells Fluid Filled Shells Mathematical Models Models Nastran Low Frequencies Matrices Mathematics Loads Forces Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
