| Popis: |
Different formulas for electromechanical coupling coefficient (EMCC) characterizing the energy conversion of piezoelectrical structures are analyzed. As a result, the fields of application for each EMCC formula are established. A general-purpose method for the EMCC determination is worked out. The dependence of the EMCC on the size, shape of electrodes, and thicknesses of elastic and piezoelectric layers is analyzed. As an example, the EMCC for cylindrical piezoelectric transducer and a three-layered beam are calculated and optimized as a function of different parameters. It is widely believed that the EMCC for dynamic state of any structure is less than the EMCC for its static state. In this paper we show the for first time that the EMCC for a dynamic behavior can be extended to a maximum static value. |
