Robust-design-optimization of Flutter velocity of an aeroelastic high-aspect-ratio wing

Subject Areas : Vibration Transmision

meysam  elyasi ¹ (Mechanical Engineering and Energy, Shahid Beheshti University, Tehran, Iran.)
ALIREZA  ROUDBARI ² (Department of Aerospace Engineering, Shahid Sattari University, Tehran, Iran)

Received: 2019-04-07 Accepted : 2019-04-15 Published : 2019-08-23

Keywords: Uncertainty, Robust Optimization, Flutter, Quasi-Steady Aerodynamic Simulation,

Abstract :

In this study, with the assumption of uncertainty in system design variables, a robust Optimization of the Flutter velocity aeroelastic wing with high-aspect-ratio under the bending-torsion effect is examined . Therefore, the aerospace wings are firstly modeled based on the Euler-Bernoulli cantilever beam model in quasi-steady aerodynamic conditions. After validating the results, in the simulation section, by using the Runge-Kutta numerical solution and the theory of Eigenvalues, the system response time and Flutter velocity are obtained. Therefore, by choosing parameters such as bending and torsional rigidity and mass per unit wing as optimization variables the effect of uncertainty on the design variables and optimized by genetic algorithm. In addition, the values of variables before and after optimization, as well as the rate of improvement of the Flutter velocity are presented in a robust and deterministic optimization. Finally, based on the optimization results, design variables for achieving an appropriate stability structure in terms of the phenomenon Flutter is confirmed.