Self-tuning of local velocity feedback controllers to maximise power absorption

Elliott, S.J., Zilletti, M. and Gardonio, P. (2010) Self-tuning of local velocity feedback controllers to maximise power absorption. Brennan, M.J., Kovacic, Ivana, Lopes Jr, V., Murphy, K., Petersson, B., Rizzi, S. and Yang, T. (eds.) In Recent Advances Structural Dynamics: Proceedings of the X International Conference. University of Southampton. 12pp .

Abstract

The active control of vibration on large structures requires multiple actuators and sensors. If these are arranged in collocated pairs, multiple modules, each containing an actuator, sensor and independently acting feedback controller, can be used to achieve control.

Although the use of such a modular approach to active control has several attractions, to provide good performance they must be able to self-tune their feedback gain to adapt to the environment they find themselves in.
In this paper, the self-tuning of such local velocity feedback controllers is considered based on the maximisation of their absorbed power, as estimated from the measured velocity signal. It is found that, for broadband excitations, maximisation of the power absorbed, which requires only local measurements, provides a good approximation to the minimisation of the overall kinetic energy in a structure, corresponding to its global response.

The method is initially demonstrated assuming ideal force actuators, but the modifications of the method are also discussed for the more practical case of inertial actuators.

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