Papers Published

  1. Heeg, Jennifer and Dowell, Earl H., Aerodynamic and aeroelastic insights using eigenanalysis, Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, vol. 3 (1999), pp. 2242 - 2252 .
    (last updated on 2007/04/10)

    Abstract:
    This paper presents novel analytical results for eigenvalues and eigenvectors produced using discrete time aerodynamic and aeroelastic models. An unsteady, incompressible vortex lattice aerodynamic model is formulated in discrete time; the importance of several modeling parameters is examined. A detailed study is made of the behavior of the aerodynamic eigenvalues both in discrete and continuous time. The aerodynamic model is then incorporated into aeroelastic equations of motion. Eigenanalyses of the coupled equations produce stability results and modal characteristics which are valid for critical and non-critical velocities. Insight into the modeling and physics associated with aeroelastic system behavior is gained by examining both the eigenvalues and the eigenvectors. Potential pitfalls in discrete time model construction and analysis are examined.

    Keywords:
    Eigenvalues and eigenfunctions;Equations of motion;Computational fluid dynamics;Computer simulation;Vortex flow;Numerical analysis;Time domain analysis;Approximation theory;