Aerothermoelastic Analysis and Flutter-Boundary Control of Composite Laminated Panels
This study focuses on the aerothermoelastic characteristics of composite laminated panels with fully simply-supported boundaries in supersonic airflow,implementing macro fiber composites(MF-Cs)for active flutter-boundary control.In modeling the equation of motion,the influence of in-plane ther-mal load on transverse bending deflection is considered,and the aerodynamic pressure in supersonic airflow is calculated on the basis of supersonic piston theory.Motion differential equations of the structural system are derived from classical laminated plate theory and Hamilton's principle with the assumed mode method,then transformed into state space equations.By solving the state matrix eigenvalues,natural frequencies of the structural system are obtained.Aerothermoelastic characteristics of the laminated panel are analyzed via the frequency domain method,assessing the effects of ply angle and geometric parameters of the lami-nated panel on critical flutter aerodynamic pressure and critical buckling temperature.The proportional feedback control method is used to design the controller,and flutter boundaries of the laminated panel are computed under different control gain coefficients.Results demonstrate that the laminated panel with a ply angle of[90°/—90°/90°]exhibits the lowest aerothermoelastic stability across various aspect ratios.For larger ply angles,an increase in aspect ratio enhances the aerothermoelastic stability of the laminated pan-el.Adjusting MFC ply angles effectively increases critical flutter aerodynamic pressure.Moreover,the proportional feedback control method can significantly enhance flutter boundaries,but the control gain co-efficient requires to be adjusted to ensure stability and performance of the control system.A control gain coefficient that is too small results in weak control,while one that is too large can destabilize the structural system.
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