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Experimental and analytical investigation of actively damped beam vibrations

Pietrzakowski M

Mechanics and Mechanical Engineering

2001

Vol. 5, nr 2

111-120

The problem of active damping of cantilever beam transverse vibrations is considered, by using a collocated piezoceramic sensor and actuator. Experimental results of free vibrations confirmed the effectiveness of the control circuit with the analog derivative controller for suppression of a low-frequency beam motion. Theoretical analysis is based on the simplified pure bending model of interaction between the piezoactuator and the beam with a constant equivalent stiffness. The viscoelastic material parameters of the tested beam are estimated considering the fundamental frequency and logarithmic decrement of transient vibrations. The results of simulation, even for the applied simplified model of the system, are in a good agreement with the experiment.