Moreover, it is judged that this sensor can be applied to large-sized structure since it is possible to install large numbers of generators at relatively low cost by using unimorph
piezoelectric sensor which is easy to handle.
The cantilever transducer has different configurations such as bimorph, unimorph
, and rainbow .
A peak power of 615 ^W was obtained with an adhered double-layer stalk of 72 x 16 x 0.41 mm at 8 m/s on a 5 Mi load and the maximum power density of 2036 [micro]W/[m.sup.3] was obtained with a unimorph
narrow-short stalk of 41 x 8 x 0.205 mm at 7 m/s on a 30 Mi load.
Finite Element Analysis of Galfenol Unimorph
Vibration Energy Harvester, IEEE Transactions on Magnetics 48(11): 3977-3980.
Design and simulation of unimorph
piezoelectric energy harvesting system, in COMSOL Conference in Bangalore, 17-18 October 2013, Bangalore, India.
An analytical approach based on strain energy evaluation is presented in order to model the unimorph
piezoelectric circular diaphragm.
Piezoelectric fibers, a piezoceramic wafer or a piezoceramic unimorph
structure are mounted within the tire such that an electric charge is generated as the wheel assembly moves along a ground surface and is stored in energy storage devices.
Called Thunder (for thin-layer composite unimorph
ferroelectric driver and sensor), the new technology is based on a piezoelectric ceramic wafer attached to a metal backing with a polyimide adhesive, according to Joycelyn Simpson, a materials research engineer in Langley's Composites and Polymers Branch.
Typically, the vibration-induced piezoelectric energy harvester is composed of a cantilever beam with a tip mass and one or two layers of piezoelectric material (simply called unimorph
or bimorph, resp.).
According to the different structures, piezoelectric transducers can be divided into unimorph
, bimorph, rainbow type, cymbal type, moonie type, stack type, and so forth [56, 57, 59-63].
At room temperature and ambient pressure, unimorph
and bimorph, which utilize the lateral extensional piezoelectric effect, are considered as a promising solution for sensing and energy harvesting [7, 8].
(iv) the production of the material in different types of morphology (unimorph
, bimorph, s-morph, etc.);