Identification and Quantification of Damping Mechanisms of Active Constrained Layer Damping

摘要

To optimise ACLD (Active Constrained Layer Damping) treatments, it is essential to identify and quantify the different mechanisms leading to the reduction of vibrational energy in the structure. Shen showed that the power input by an external excitation in a beam treated with ACLD is dissipated by the shearing of the viscoelastic layer and by the absorption of mechanical energy by the actuator. In this work, it is shown that the actuator also change the structure impedance, and thus the power input by external disturbances. The motion of a fully treated beam is calculated with a wave approach model. Then, the power balance of the structure is derived, and ACLD treatments' mechanisms of action are identified and quantified.