Abstract
The electric generation characteristics of the PZT piezoelectric ceramics were examined experimentally and numerically. In this case, cyclic bending loading was applied to the PZT ceramics: bulk and thin-film membrane. Electric voltage increased with increasing the strain value. There was a sharp initial increase in positive voltage for the PZT ceramics as bending load was applied. Following this initial increase stage, a rapid fall to zero occurred. The reduction rate of the positive voltage was changed depending on the rigidly of the PZT ceramic: the higher the reduction rate, the higher the rigid of the ceramic. The electrical voltage from the circular membrane PZT ceramic during cyclic loading showed the higher level compared to that for the bulk one, in which the flexibility of the PZT ceramic was significant factor to obtain the high electric voltage. The variation of the electric voltages was estimated numerically, which was relatively in good agreement with the experimental one.
Highlights
The energy conversion of electrical and mechanical sources is an important aspect in our current life for power generators
The electric voltage rises sharply to the maximum level as applied load is conducted to the PZT ceramics
The reduction rate of electric voltage is different depending on the sample as enclosed by the dashed circles in Figure 4: that decreases rapidly and slowly for bulk and circular membrane PZT ceramic, respectively
Summary
The energy conversion of electrical and mechanical sources is an important aspect in our current life for power generators. Today, harvested energy systems have been developed by several engineers as new energy systems in which PZT ceramic plates are embedded under the floor or ground, e.g., roads, bridges, houses, and wicket gates In this instance, the energy in the pavement caused by vehicles and gravity can be harvested using piezoelectric transducers (Zhao, Yu, & Ling, 2010); a related energy could be obtained via the walking motion of the human body, e.g., a heel-strike generator (Howells, 2009). Shu and Lien have investigated the harvested power generation characteristics under different vibrating conditions (frequency and acceleration), mechanical damping ratio, and electromechanical coupling coefficient. No clear analysis is obvious for investigation of the piezoelectric properties (electric generation) and for the confirmation of the experimental results under different mechanical loading conditions. In the present work, an attempt was made to perform the experimental and numerical analysis to understand the electrical generation characteristics of the commercial PZT ceramics
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