Method and device for calculating mechanical quality factor of piezoelectric ceramic ring

Abstract

The invention discloses a method and a device for calculating a mechanical quality factor of a piezoelectric ceramic ring. The method comprises the following steps: establishing a loss-containing decoupling equivalent circuit model of the piezoelectric ceramic ring; performing simulation calculation on the equivalent circuit model to obtain an impedance-frequency characteristic curve; and calculating the mechanical quality factor of the piezoelectric ceramic ring under the resonance frequency and the anti-resonance frequency through the impedance spectrum. The method is based on a loss-containing decoupling equivalent circuit model. According to the method, the piezoelectric ceramic ring in the radial vibration mode is subjected to simulation analysis, the mechanical quality factor of thepiezoelectric ceramic ring under the resonance frequency and the anti-resonance frequency is obtained through calculation, the calculation process is simple, the calculation efficiency is high, and the mechanical quality factor of the piezoelectric ceramic ring can be accurately estimated.

Description

technical field [0001] The invention relates to a method and a device for calculating the mechanical quality factor of a piezoelectric ceramic ring, and belongs to the technical field of piezoelectric material characteristic research. Background technique [0002] Piezoelectric ceramics is a kind of intelligent piezoelectric material. When an alternating electric field is applied to it, elastic vibrations of various modes can be excited in the piezoelectric body through the electromechanical coupling effect, among which the radial vibration mode is the most basic. It is one of the vibration modes of the piezoelectric transducer, and it has a wide range of applications in devices such as piezoelectric transducers, ultrasonic motors, and piezoelectric sensors. The mechanical quality factor is an important parameter to measure piezoelectric ceramics, which indicates the degree of energy consumption inside the material during vibration conversion. The larger the mechanical qual...

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Problems solved by technology

However, at present, in the research on the radial vibration modal equivalent circuit of piezoelectric ceramic rings, most of them only consider the dielectric loss or elastic loss of piezoelectric ceramic rings, and there are few studies on piezoelectric loss.

However, existing studies have shown that piezoelectric loss has a great influence on the heating characteristics of piezoelectric materials.

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