An experimental study of the response of a rectangular, aluminum cantilever plate under transverse harmonic excitation is presented. Three test sequences, each involving a frequency sweep around a particular natural frequency of the plate and a different amplitude of base excitation, were performed. A couple of interesting nonlinear dynamics phenomena presented themselves in every test sequence. These phenomena include two-to-one and three-to-one internal resonances, external combination resonance, energy transfer between widely spaced modes, period-doubled motions, and chaos. In addition, the influence of the excitation amplitude on the energy transfer between widely spaced modes via modulation was also analyzed. It was found experimentally that the amount of energy transfer between the high- and low-frequency modes is strongly dependent on the closeness of the modulation frequency to the natural frequency of the low-frequency mode. If the modulation frequency is close to the low-mode frequency, then the amplitude of the low-mode response is large, otherwise it is small.

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