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Nastran hydroelastic modal studies. volume 1: introduction, theory, and results
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Copyright Year | 1977 |
| Description | The implementation of a general three-dimensional hydroelastic capability in the NASTRAN computer program is described. A method for analyzing the combined mode shapes of arbitrary fluid and structure finite element models was developed. The fluid was modeled with three-dimensional solid elements with options for tetrahedron, wedge, and hexahedron shapes. The elements were then connected to fluid grid points which defined the pressure in the fluid at the specified location. Matrices were formulated to provide efficient solutions for large-order problems. The structure matrices were processed separately and could be reduced using matrix condensation procedures or through a modal formulation using the normal modes of the empty structure as solution coordinates. The fluid/structure interface and the free surface were defined by the user with special NASTRAN boundary elements. A special purpose mesh generator program was provided to generate the actual NASTRAN data cards for the fluid, the structure, and the boundary elements for typical tank-type models. |
| File Size | 1468738 |
| Page Count | 44 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19790017180 |
| Archival Resource Key | ark:/13960/t8x970r00 |
| Language | English |
| Publisher Date | 1977-05-31 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer External Tanks Hydroelasticity Space Shuttles Nastran Computer Programs Compressible Fluids Structural Analysis Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
