Developments in the use of structural actuators for decentralised active control

Elliott, S.J., Gardonio, P., Aoki, Y. and Baumann, O. (2008) Developments in the use of structural actuators for decentralised active control. 37th International Congress and Exhibition on Noise Control Engineering (inter.noise2008), Shanghai, China. 25 - 29 Oct 2008. 8 pp .

Abstract

With an array of collocated force actuators and velocity sensors, decentralised feedback controllers can not only be unconditionally stable, but their performance in reducing vibration and radiated sound can approach that of a centralised LQG controller [1]. They also have a modular architecture that can be scaled, even for very large structures. This paper discusses the use of either piezoelectric or proof-mass transducers, instead of ideal force actuators, in such decentralised controllers. Piezoceramic actuators can give significant control in thinner structures, but as well as controlling out-of-plane vibration they also create in-plane motion in the structure that can couple into closely located strain sensors causing instability in feedback controllers. Novel triangular arrangements of such transducers will be described in which the effect of in-plane coupling is minimised, thus significantly improving their performance. Proof-mass actuators are attractive when generating significant forces at low frequencies, but their natural frequency must be well below the first structural resonance frequency for stable operation.

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