Derkach O. Damping of Transient Vibrations of Electro-Viscoelastic Composite Constructions Elements

Object of research - transient vibrations of dissipative active and passive elements of composite structures. The aim of the study - development of the method of analysis of the active damping of transient vibrations of electro-viscoelastic elements of composite structures, taking into account the energy dissipation in materials. Using the system of Voigt-Reuss hypothesis, a mathematical model of laminated composite viscoelastic and electro-viscoelastic materials were constructed. Semi-analytical finite element models of multilayer composite viscoelastic and electro-viscoelastic plates are constructed. The influence of the coefficients for the proportional-derivative control law on the elastic and dissipative properties of the multilayer composite plates is investigated. The dependences of the influence of an angle and a reinforcement ratio and the frequency-dependent energy dissipation in the composite layers for the active and hybrid damping effectiveness of a plate are established. For the first time, active damping of transient vibrations is considered, in which taking into account the frequency-dependent energy dissipation in passive and active electro-viscoelastic materials. The results of researches were used by the "Piezosensor" Ltd during developing piezoelectric vibration sensors and used by Institute of Transport Systems and Technologies "Transmag" of the National Academy of Sciences of Ukraine during the design of composite blades of a wind turbine.