Abstract
This paper describes the vibration characteristics of a dual-bimorph piezoelectric pumping element under fluid–structure coupling. Unlike the single bimorph used in most previous studies, the proposed device comprises two piezoelectric bimorphs within an acrylic housing. Amplitude-fluctuation electronic speckle pattern interferometry (AF-ESPI) was used to examine the visible displacement fringes in order to elucidate the anti-phase as well as in-phase motions associated with vibration. Analysis was also conducted using impedance analysis and laser Doppler vibrometer (LDV) based on the measurement of point-wise displacement. The experimental results of resonant frequencies and the corresponding mode shapes are in good agreement with those obtained using finite element analysis. The gain of flow rate obtained by the anti-phase motion of the dual-bimorph pumping element is larger than both those obtained by in-phase motion and the single bimorph pumping element. This work greatly enhances our understanding of the vibration characteristics of piezoelectric pumping elements with two bimorphs, and provides a valuable reference for the further development of bionic pump designs.
Highlights
Due to the characteristics of interchanging the electric field with the mechanical field, the piezoelectric materials are often used as parts of the sensors or actuators
It is shown that the anti-phase vibration of the pumping element with the dual bimorph can clearly provide a better feature than that with a single bimorph due to the compression effect by two bimorphs, which deforms in opposite directions
We conducted extensive analysis of the vibration characteristics under structure–liquid coupled conditions using full-field optical methods based on the amplitude-fluctuation electronic speckle pattern interferometry (AF-ESPI)
Summary
Due to the characteristics of interchanging the electric field with the mechanical field, the piezoelectric materials are often used as parts of the sensors or actuators. Huang et al [18] used three experimental techniques, including AF-ESPI, laser Doppler vibrometry (LDV), and impedance analysis to validate a theoretical analysis model derived for piezoceramic disks under stress-free boundary conditions They used theoretical analysis, numerical simulation, and experimental measurements to assess the vibration characteristics for piezoceramic annular disks. Used AF-ESPI and numerical analysis to investigate the out-of-plane resonant characteristics of a cantilevered piezoceramic plate in air and three types of fluid Both experimental and theoretical measurements revealed that the resonant frequencies decreased with an increase in the viscosity of the fluids. We developed a pumping element that uses two cantilevered piezoelectric bimorphs rather than a single bimorph in order to increase the flow rate. Our findings provide a novel perspective for the further development of piezoelectric pumping elements driven by two bimorphs
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