PSI - Issue 28

D.A. Oshmarin et al. / Procedia Structural Integrity 28 (2020) 1438–1448 Author name / Structural Integrity Procedia 00 (2019) 000–000

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а б Fig. 2. Graphical dependencies of the components of complex dynamic moduli on frequency.

All the parameters (all properties of the elastic, viscoelastic and piezoelectric material, dimensions of viscoelastic layer and piezoelectric element) of the configurations under study were chosen in such a way that the level of damping of specified vibration modes, achieved with different mechanisms of vibration energy dissipation, was of the same order. Thus, a comparison of efficiency of application of viscoelastic materials and shunted piezoelectric element was carried out by esteeming the influence of adding of corresponding elements on dissipative properties of the system. A resistive R -circuit consisted of one single resistive element with resistance R and series resonant RL -circuit consisted of resistive and inductive elements connected in series and characterized by values of resistance R and inductance L were considered as shunting circuits. Design schemes for configuration II with the indicated options of shunting circuits are presented at figure 3.

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b

Fig. 3. Design schemes of the plate with piezoelectric element and external electric R -circuit (a) or series RL -circuit (b). Configuration II.

In order to reach the best damping of the specified vibration modes when shunted piezoelectric element is used as damping device one should provide the highest part of energy transformed from mechanical into electric domain and transferred to an electric circuit. This goal can be achieved by a proper positioning of piezoelectric element on a structure (Crawley and de Luis, 1987; Ducarne et al., 2013; Ramesh and Narayanan, 2007) and also by a corresponding choice of values of elements of an electric circuit (Hagood and von Flotow, 1991; Park and Inman, 2003; Wu et al., 2009; Moheimani and Fleming, 2006). In order to determine the optimal location of the piezoelectric element, an approach based on the analysis of