Theoretical and experimental research on the influence of multiple piezoelectric effects on physical parameters of piezoelectric actuator

Abstract

Compared with the traditional actuator of machinery and electricity, the piezoelectric actuator has the advantages of a compact structure, small volume, no mechanical friction, athermancy and no electromagnetic interference. Therefore, it has high application value in the fields of MEMS, bioengineering, medical science and so on. This article draws conclusions from the influence of multiple piezoelectric effects on the physical parameters (dielectric coefficient, equivalent capacity, energy conversion and piezoelectric coefficient) of piezoelectric actuators. These data from theoretical and experimental research show the following: (1) The rate between the dielectric coefficient of piezoelectric in mechanical freedom and clamping is obtained from the secondary direct piezoelectric effect, which enhances the dielectric property, increases the dielectric coefficient and decreases the coefficient of dielectric isolation; (2) Under external field, En(ex)=E1, exterior stress T = 0, that is to say, under the boundary condition of mechanical freedom, piezoelectric can store electric energy and elasticity, which obtains power density, elastic density and an electromechanical coupling factor; (3) According to the piezoelectric strain Si(1), piezoelectric displacement Dm(2) and piezoelectric strain Si(3) of multiple piezoelectric effects, when the dielectric coefficient of the first converse piezoelectric effect ε33 is 1326 and the dielectric coefficient of the secondary direct piezoelectric effect increases to 3336, the dielectric coefficient of the ceramic chip increases. When the piezoelectric coefficient of the first converse piezoelectric effect d33 is 595 and the piezoelectric coefficient of the secondary direct piezoelectric effect decreases to 240, the piezoelectric coefficient of the ceramic chip will decrease. It is of major significance both in the applications and in basic theory to research the influence of multiple piezoelectric effects on the physical parameters of piezoelectric actuators. On the one hand, this can further increase the control precision of piezoelectric actuators. On the other hand, it can be applied to research on the physical parameters and self-sensing actuators, like piezoelectric quartz and piezoelectric ceramic self-sensing actuators, which will be of great service for MEMS.

Sensitivity enhancement of piezoelectric force sensors by using multiple piezoelectric effects

“…13,14 The influence of multiple piezoelectric effects on physical parameters of piezoelectric actuator was also theoretically and experimentally studied. 15 However, the previous works mainly aimed at the piezoelectric ceramics and only some verification experiments were performed. The most commonly used materials in the piezoelectric force sensors were piezoelectric quartz crystals.…”

“…The most commonly used materials in the piezoelectric force sensors were piezoelectric quartz crystals. 11,[15][16][17][18] Moreover, the piezoelectric coefficient of the quartz is much less than that of the ceramic. The effective method for the ceramic is not always suitable for the quartz and requires further validation.…”

Preface: Micro-Nano Technology

“…17 Besides, theoretical and experimental research on the influence of multiple piezoelectric effects to physical parameters of piezoelectric actuator is also introduced. 18 In the field of Micro-fluidics, three studies involving a zero-flow micro fluidics for long-term cell culture and detection, 19 the application of micro-PIV on the flow characteristics detection of micro-gap rotational flow field, 20 and super cooling and cold energy storage characteristics of Nano-media in ball-packed porous structures are presented. For the Bio MEMS and Applications, the investigations of composite vascular repair grafts via Micro-imprinting and electrospinning 22 and piezoresistive Micro cantilever aptasensor for ricin detection and kinetic analysis are reported.…”