Structural Dynamics-based Aeroelastic Analysis

Modern aircrafts is required of high speed, light structure, great flexibility, and super maneuverability, which leads to strong interaction between the flexible structure and the surrounding flow. Consequently aircrafts suffers a more serious aeroelastic problem. With the development of high-performance computers, the computational fluid dynamic (CFD)/computational structure dynamic (CSD) numerical simulation can predict the aeroelastic response accurately, but the simulation remains too computationally expensive to be used in multi-disciplinary settings and the aeroelastic analysis of complicated systems. So the problem of how to improve the computational efficiency is a hot topic.In this paper, the coupling for pneumatic and flexible model, given the frequency domain aerodynamic formula, and expressed as a rational polynomial of the equivalent transformation, to derive the full dynamic equations with a similar structure, on the two unknown variables order ordinary differential equations. Thus, in the calculation of structural dynamics can be achieved under the framework of Aeroelastic analysis of the problem and calculation. This method will be general computing structure, function and dynamics program testing or numerical analysis and the combination of aerodynamic models, simplifies analysis of aeroelastic coupling and increases efficiency.The main innovations in this paper are as follows:1. Using the Theodorsen aerodynamics as an example, adapting rational polynomial fitting and specific equivalent transformation to establish aerodynamics second order ordinary differential equations in the time domain.2. Using the general computational structural dynamics program, to achieve a flexible coupling of aerodynamic.3. Establish a closed-loop control model, application sub-optimal control law, for the active suppression of flutter.