Abstract :
The paper presents details of a numerical formulation and associated general-purpose Þnite element (FE)
software developed for the integrated aeroelastic and aeroservoelastic (ASE) analysis of complex engineering
systems, encompassing such disciplines as structures, unsteady aerodynamics, and feedback controls.
A linear analysis, involving panel methods for derivation of unsteady aerodynamic forces, is achieved by
transforming the equations of motion from the frequency to the Laplace domain and formulating a statespace
matrix relationship, the related matrices being further augmented by the analog elements such as
actuators and Þlters as well as digital or analog controllers. For non-linear problems, FE-based structural
and computational ßuid dynamics (CFD) solutions are adopted for the relevant analyses.
Numerical results pertaining to a number of practical problems, obtained by utilizing the associated
computer program, are compared to those derived from relevant ßight and wind tunnel tests as well as other
analyses, and they are presented here in some detail. Such results, involving damping and frequency
responses, relate to the stability characteristics of the aerospace vehicles and testify to the e¦cacy of the
present solution procedure.
Keywords :
multidisciplinary analysis , FEM , Aeroelasticity , aeroservoelasticity
