Nonlinear active vibration damping

A multivariable nonlinear controller is investigated for vibration suppression of flexible structures. The closed-loop gain matrix consists of a varying term added to a constant term. The varying term is proportional to the measured signal, providing rapid cancellation of large deflections and maintaining low noise sensitivity. L/sub 2/-stability is proved, and experimental results show improvement of performance compared to a corresponding linear controller with constant gain.<
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