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Reduction of computer usage costs in predicting unsteady aerodynamic loadings caused by control surface motions: analysis and results
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Petrarca, J. R. Sebastian, J. D. Rowe, W. S. |
| Copyright Year | 1979 |
| Description | Results of theoretical and numerical investigations conducted to develop economical computing procedures were applied to an existing computer program that predicts unsteady aerodynamic loadings caused by leading and trailing edge control surface motions in subsonic compressible flow. Large reductions in computing costs were achieved by removing the spanwise singularity of the downwash integrand and evaluating its effect separately in closed form. Additional reductions were obtained by modifying the incremental pressure term that account for downwash singularities at control surface edges. Accuracy of theoretical predictions of unsteady loading at high reduced frequencies was increased by applying new pressure expressions that exactly satisified the high frequency boundary conditions of an oscillating control surface. Comparative computer result indicated that the revised procedures provide more accurate predictions of unsteady loadings as well as providing reduction of 50 to 80 percent in computer usage costs. |
| File Size | 2287663 |
| Page Count | 86 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19790011901 |
| Archival Resource Key | ark:/13960/t9g49h806 |
| Language | English |
| Publisher Date | 1979-03-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Dynamic Structural Analysis Unsteady Aerodynamics Cost Reduction Trailing Edges Flaps Control Surfaces Data Processing Flutter Aeroelasticity Leading Edges Aerodynamic Loads Computer Programs Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
