| Author | Olivier A. Bauchau, Carlo L. Bottasso, Mustafa Dindar, Hema S. Murty, Zvi Rusak and Mark S. Shephard |
|---|---|
| Title | Aeroelastic Stability of Rotor Blades Using A Parallel Adaptive Finite Element Solver |
| Year | 1995 |
| Pages | - - |
| Editor | - - |
| Abstract | This paper presents results from an aeroelastic analysis of rotor blades. Aerodynamic loads and moments are predicted by a parallel, adaptive, finite element CFD code. This code solves the Euler equations using an implicit, time discontinuous, Galerkin, least squares finite element method. Unsteady moving boundaries are computed using a space-time deforming element technique. This CFD code is coupled with a multi-body, computational structural dynamics (CSD) code DYMORE. The structural idealization of the helicopter blade is a geometrically exact, nonlinear finite element model. The CSD code can model general nonlinear, elastic, multi-body systems using the finite element method. The resulting coupled code is applied to the example of a rotor blade in hover, which is a test case from the Integrated Technology Rotor Assessment workshop. Equilibrium deflections in flap, lead-lag and torsion modes are first obtained at several values of collective pitch angles. The blade is then perturbed dynamically and undergoes unsteady motion. A dynamic coupled analysis then produces damping and frequency values for aeroelastic stability analysis. |