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Abstract: This paper describes experimental investigations of an adaptive control for suppressing thermo-acoustic instabilities in Rijke tube. Strong coupling between pressure oscillations and unsteady heat release excites a self-sustained acoustic wave which results in a loud, annoyed sound and may also lead to a structural damage to the combustion chamber. Adaptive controller based on dynamic compensation is adopted to suppress the instabilities in Rijke tube. The controller provides proper control action in response to pressure changes in combustors. Unknown noise and disturbance will be estimated and compensated actively by adaptive controller, which makes the feedback control less dependent on the precise model of the complex thermo-acoustic processes in Rijke tube. Experiment results confirm the controller employed is effective in breaking up the oscillations in Rijke tube. [Copyright &y& Elsevier]

Abstract: The synchronization of two Ghostburster neurons under different external electrical stimulations is considered. First, Ghostburster neuron model under external electrical stimulation is introduced. Then, the synchronization of general master-slave chaotic systems is formulated and an adaptive controller based on dynamic compensation is designed to drive the slave neuron to track the behaviors of the master neuron. The construction of synchronization controller is easy to achieve and the exact knowledge of the systems is not necessarily required. Asymptotic synchronization can be achieved by choosing proper controller parameters. Simulation results confirm that the adaptive control approach employed in this paper is valid in the synchronization of two Ghostburster neurons. As a promising synchronization approach, it is expected to realize the synchronization of other neural systems effectively. [Copyright &y& Elsevier]