The flutter,post-flutter and active control of a two-dimensional airfoil with control surface operating in supersonic/hypersonic flight speed regions is investigated in this paper.A two-degree-of-freedom dynamic model...
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The flutter,post-flutter and active control of a two-dimensional airfoil with control surface operating in supersonic/hypersonic flight speed regions is investigated in this paper.A two-degree-of-freedom dynamic model is established,in which both the cubic nonlinear structural stiffness and the nonlinear aerodynamic load are accounted *** third order Piston Theory is employed to derive the aerodynamic loads in the supersonic/hypersonic *** flutter happens with a phenomenon of limit cycle oscillations(LCOs)when the flight speed is less than or greater than linear critical *** flutter boundary of supersonic/hypersonic airfoil is studied over a range of nonlinear *** LQR approach is employed to design a control law to increase both the linear and nonlinear critical speed of aerodynamic flutter,and then a combined control law is proposed in order to reduce the amplitude of LCOs by adding a cubic nonlinear feedback *** and numerical simulation methods are used to predict the flutter characteristics of the airfoil with/without *** dynamic responses of the controlled system are given and used to compare with those of the uncontrolled *** of simulation show that the active flutter control method proposed here is effective.
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