| タイトル | An analytical technique for approximating unsteady aerodynamics in the time domain |
| 本文（外部サイト） | http://hdl.handle.net/2060/19810002914 |
| 著者（英） | Dunn, H. J. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 1980-11-01 |
| 言語 | eng |
| 内容記述 | An analytical technique is presented for approximating unsteady aerodynamic forces in the time domain. The order of elements of a matrix Pade approximation was postulated, and the resulting polynomial coefficients were determined through a combination of least squares estimates for the numerator coefficients and a constrained gradient search for the denominator coefficients which insures stable approximating functions. The number of differential equations required to represent the aerodynamic forces to a given accuracy tends to be smaller than that employed in certain existing techniques where the denominator coefficients are chosen a priori. Results are shown for an aeroelastic, cantilevered, semispan wing which indicate a good fit to the aerodynamic forces for oscillatory motion can be achieved with a matrix Pade approximation having fourth order numerator and second order denominator polynomials. |
| NASA分類 | STRUCTURAL MECHANICS |
| レポートNO | 81N11422
L-13255
NASA-TP-1738 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/170873 |
