Equivalent circuit of piezoelectric resonant disk gyroscope through admittance circle method

This work aimed to construct a new equivalent circuit which is useful for the further studying of the resonator in the piezoelectric gyroscope. Measurements of the actual admittance circle are used to improve the parameters of the Van Dyke's model. Meanwhile, a parallel resistance to form the new equivalent circuit through analysis is added. The relative error of phase and impedance are 0.335 and 3.68%, respectively. Different values of parallel resistances are added to verify the rationality of the circuit. Contrast to the traditional Van Dyke's model, the new equivalent circuit is more complete in explaining the energy dissipation.