Aeroelastic flutter
Therefore, conventional sliding mode and fuzzy sliding mode control algorithms are suggested for the stabilization of a multi-input-multi-output nonlinear aeroelastic model. This paper proposes a robust solution for the design and stability of nonlinear aeroelastic airfoils of fixed-wing drones that are widely exploited in many fields such as meteorology and surveillance. Therefore, for increased airplane performance and efficiency, AFS is a key approach in the field of unconventional aeroelasticity.
![aeroelastic flutter aeroelastic flutter](http://4.bp.blogspot.com/-gJv3b72CoRQ/VPeOQNbv6CI/AAAAAAAABx4/Y0O0g6otfVA/s1600/1-26-2015%2B4-03-44%2BPM.png)
Consequently, with the aid mass balancing, the non linear effects such as Limit Cycle Oscillations (LCO), baggy control system linkages and Internal Resonance are eliminated or reduced. In the critical flutter speed, the non linear characters play a vital role in the view of complex systems design and accuracy. Mass balancing and stiffness enhancement with control systems are the different methods available to implement AFS. It includes the structural and fluid dynamic properties required to design an active control to capture the effects of flutter frequency. Mathematical models for various control designs provided are capable enough to link the response of wing structures against the oncoming airflow. In this review article, the contributions of different researchers in the field of AFS over the years are investigated.
![aeroelastic flutter aeroelastic flutter](https://i.ytimg.com/vi/qpJBvQXQC2M/maxresdefault.jpg)
To overcome the instabilities, (particularly flutter modes) an Active Flutter Suppression (AFS) technique has been proposed during the year of 2002. The unkind Aeroelastic instabilities have an influence on the airplane performance and its structural life to a large extend. The variable pressures exerted on the wing geometry will cause the redundant vibrations by flutter effect. In a cruising mission, an airplane wing is subject to intense dynamic pressure changes with different magnitudes.