ENERGY DISSIPATION PERFORMANCE OF A PIEZOELECTRIC SHUNTED SYSTEM WITH NEGATIVE CAPACITANCE

With semi-active piezoelectric shunted damping technology,when different structures of negative capacitance shunted circuits are used,the system damping is different.Semi-active shunted circuits with negative capacitance are discussed including three forms: series negative-capacitance resistance;series negative-capacitance resistance and inductive;parallel negative-capacitance resistance.With a energy dissipation model,the energy dissipation factor and the stiffness ratio of different shunted configurations are analyzed and compared.The series negative-capacitance,resistance and inductive shunted system has higher damping performance at lower frequencies with a broader band,while the damping performance of the parallel negative-capacitance resistance shunted system is better at high frequencies.