| タイトル | Stability of nonuniform rotor blades in hover using a mixed formulation |
| 本文（外部サイト） | http://hdl.handle.net/2060/19800025269 |
| 著者（英） | Kung, R. M.; Hodges, D. H.; Avila, J. H.; Stephens, W. B. |
| 著者所属（英） | NASA Ames Research Center |
| 発行日 | 1980-08-01 |
| 言語 | eng |
| 内容記述 | A mixed formulation for calculating static equilibrium and stability eigenvalues of nonuniform rotor blades in hover is presented. The static equilibrium equations are nonlinear and are solved by an accurate and efficient collocation method. The linearized perturbation equations are solved by a one step, second order integration scheme. The numerical results correlate very well with published results from a nearly identical stability analysis based on a displacement formulation. Slight differences in the results are traced to terms in the equations that relate moments to derivatives of rotations. With the present ordering scheme, in which terms of the order of squares of rotations are neglected with respect to unity, it is not possible to achieve completely equivalent models based on mixed and displacement formulations. The one step methods reveal that a second order Taylor expansion is necessary to achieve good convergence for nonuniform rotating blades. Numerical results for a hypothetical nonuniform blade, including the nonlinear static equilibrium solution, were obtained with no more effort or computer time than that required for a uniform blade. |
| NASA分類 | STRUCTURAL MECHANICS |
| レポートNO | 80N33777
AVRADCOM-TR-80-A-10
A-8314
NASA-TM-81226
PAPER-13 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/171043 |
