The present paper describes three basic aeroelastic and nonlinear vibration problems investigated by the author and his students: namely, 1) stall flutter and nonlinear divergence of a two-dimensional flat-plate wing, 2) nonlinear vibrations of a clamped and a buckled beam, and 3) dynamic stability of a pendulum under parametric excitation. All of these problems seemed simple and were easily modeled experimentally and analytically. Yet they revealed some fundamental and interesting characteristics of nonlinear aeroelastic and vibration behavior of structures. Some experimental data are presented here that still remain to be resolved.
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