We have examined both experimentally and theoretically a piezoelectric unimorph cantilever as a liquid viscosity-and-density sensor. The fabricated piezoelectric unimorph consisted of a PbO•ZrO2•TiO2 ~PZT! layer on a thin stainless-steel plate. In addition to a driving electrode, a sensing electrode was placed on top of the PZT layer, permitting the direct measurement of the resonance frequency...

Abstract Piezoelectric transducers which rely on oscillating cantilever-type beams to harvest mechanical energy locally available in environments have been of great interest as a substitute for batteries. Most the research efforts focus mostly designs aim at resonance matching achieve maximum output without taking degradation piezoelectric layers into consideration. The purpose this study is pr...

The structural scheme of an electromagnetoelastic actuator for nano biomechanics is found. has difference in the visibility energy conversion from Cady and Mason electrical equivalent circuits a piezo vibrator. electromagnetoelasticity equation differential are solved to construct actuator. obtained by using reverse direct piezoelectric effects. transfer functions written

Piezoelectric transduction has received great attention for vibration-to-electric energy conversion over the last five years. A typical piezoelectric energy harvester is a unimorph or a bimorph cantilever located on a vibrating host structure, to generate electrical energy from base excitations. Several authors have investigated modeling of cantilevered piezoelectric energy harvesters under bas...

PALMER, JEREMY ANDREW. Development of Millimeter Scale Motors For Miniature Direct Drive Robots. (Under the direction of Dr. Edward Grant, and Dr. Jeffrey W. Eischen) The twentieth century marked a period of rapid expansion of technology associated with miniaturization of engineering systems. A recent theme in this trend is the development of miniature, distributed robots that mimic insect beha...

This article is a comparative study of the design spaces of two bio-implantable acoustically excited generator architectures: the bulk-mode piezoelectric plate (plate) and the flexure-mode unimorph piezoelectric diaphragm (diaphragm). The acoustic to electrical power transducers, or generators, are part of an acoustic, or ultrasonic, power transfer system for implantable sensors and medical dev...

A novel surface micromachining process is reported for aluminum nitride (AlN) thin films to fabricate piezoelectric unimorph suspension devices for micro actuator applications. Wet anisotropic etching of AlN thin film is used with a Cr metal mask layer in the microfabrication process. Tetra methyl ammonium hydroxide (TMAH) of 25 wt.% solution is used as an etching solution for the AlN thin film...

Possibilities for the " parasitic " collection of power from human walking motion are explored. The focus is on the walking action as a source of power because of the extensive range of motion and large dynamic forces associated with the heel strike and the bending of the sole. Two piezoelectric systems: a multilayer laminate made from PVDF foil and a unimorph piezoceramic composite (PZT); as w...