Feedback control of wave propagation in a rectangular panel, part 2: Experimental realization using clustered velocity and displacement feedback

This study presents the feedback control of flexural waves propagating in a rectangular panel. The objective of this paper (part 2) is to experimentally implement the feedback wave control method which was proposed in part 1 of the two series papers. Firstly, based on the collocation of sensors and actuators, clustered velocity and displacement feedback (C-VDFB) is newly proposed. Next, linking C-VDFB with the active wave control proposed in part 1, it is clarified that the active wave control system can be realized to a limited extent. Then, from a viewpoint of numerical simulations, the characteristics of the feedback gains of C-VDFB and its control performance are clarified. It is shown that C-VDFB enables the inactivation of vibration modes at the target frequencies. Furthermore, it is clarified that even at the non-target frequencies, the proposed method sufficiently reduces the structural vibration. Finally, experiments on the reflected wave absorbing control using clustered direct velocity and displacement feedback are carried out. The experimental results show good agreement with those obtained in the simulation.

► Clustered velocity and displacement feedback (C-VDFB) was newly proposed. ► Active wave control can be realized to a limited extent by C-VDFB. ► The standing wave ratio vs. the feedback gains is gradual at higher frequencies. ► C-VDFB can reduce the vibration sufficiently even at the non-target frequencies. ► The experimental results showed good agreement with those of simulations.