Numerical and Experimental Analysis of a Hybrid (Passive-Adaptive) Vibration Control System in a Cantilever Beam Under Broadband Excitation

Thepresentwork focuses on a hybrid vibration control approach which is implemented and investigated through simulation and experimental trials. This approach is based on combining a passive control treatment, consisting of a constrained layer of viscoelastic material, with an active control arrangement composed of sensors, actuators, and an adaptive control unit that uses the FxNLMS algorithm. Such a hybrid control system is applied to a cantilever metallic beam subjected to a stochastic broadband excitation. A distinctive conclusion of this work is that the so-called feedback filter, which is part of the FxNLMS-based adaptive control unit, has shown to be detrimental to the control action in the case of the considered excitation.