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PANEL utter is an aeroelastic instability experienced by the skin panels of high-speed ight vehicles in which the structure is exposed to high supersonic ow on one side and to still air on the other side. As a result of structural nonlinearities, which are inherently present, utter amplitudes remain bounded in a limit-cycle motion. 1 In such conditions, due to high oscillation frequencies, fatigue failure of the panel may occur. On the other hand, due to aerodynamicnonlinearities, abehavioroppositeincharactercanemerge, in the sense that at high ight Mach numbers the utter boundary can become a catastrophic one. Because the various nonlinearities, for example, structural and aerodynamic, can in uence differently the character of the utter boundary, 2¡ 5 the need to approach the utter instability by including these effects becomes obvious. The lifting surface or the panels of the rocket body can include concentrated (free …