Experimental study on decentralized feedforward control strategy of plate vibrations without secondary path modeling using piezoelectric patch actuators

Decentralized velocity feedback control for elastic structures is known as an active damping control strategy, which reduces the response of the structure at resonance frequencies and consequently attenuates the wide-band disturbances. However, decentralized velocity feedback control, whose feedback gain cannot be adjusted too large, has little control effects at off-resonance frequency bands, in which case, the feedforward control strategy may be available. In this paper, an experiment of decentralized feedforward control strategy of plate vibrations without secondary path modeling using piezoelectric patch actuators is performed. This control method, which needs no structure information of the plate, is easy to coordinate with the decentralized velocity feedback control. Moreover the feedforward control is able to control the tone noise at the off-resonance frequency, so it is also a good supplement for reducing the wide-band disturbances. The experimental results have shown that the decentralized feedforward control without secondary path modeling is able to control the tone disturbance of the plate.