APPLICATION OF THE ELECTROMECHANICAL SURFACE DAMPING TO THE VIBRATIONCONTROL OF A CANTILEVER PLATE

The electromechanical surface damping technique (EMSD) is applied to s uppress the bending and twisting (torsional) peak vibration amplitudes of a cantilever plate. The technique is a combination of the constrai ned layer damping (CLD) and the shunted piezoelectric methods in which the constraining layer of the CLD is replaced by a shunted piezoelect ric ceramic. The frequency responses, to a white noise random base exc itation, of the EMSD-treated plate at the vicinity of the first and se cond bending and twisting resonant frequencies are determined and comp ared with the corresponding responses of the CLD treatment It is shown that, in general, the EMSD treatment provides more suppression of the bending and twisting peak vibration amplitudes than the conventional CLD treatment. The EMSD treatment however, is more effective at higher frequencies and lower temperatures, which suggests that the EMSD meth od can be applied to extend the effective range of frequencies and/or temperatures of the conventional CLD method. The work presented is pri marily analytical; however, a crude and preliminary experimental work is presented to demonstrate the feasibility of the EMSD technique.