Abstract
The objective of the research is to design a high power energy harvester device through a two-piece trapezoidal geometry approach. The performance of the composite two-piece trapezoidal piezoelectric PZT-PZN polycrystalline ceramic material is simulated using COMSOL Multiphysics. Results are analysed using the series configuration of a two-piece trapezoidal composite bimorph cantilever which vibrates at the first fundamental frequency. The two-piece trapezoidal composite beam designs resulted in a full-width half-maximum electric power bandwidth of 2.5 Hz while providing an electric power density of 16.81 mW/cm3 with a resistive load of 0.08 MΩ. The authors believe that these results could help design a piezoelectric energy harvester to provide local energy source which provides high electric power output.
Highlights
Advances in Materials Science and Engineering analytical solution for modes of the resonance frequency of the trapezoidal and the triangular composite piezoelectric cantilever beam [4]
E procedure used in seeking the maximum electric real power output is through finding the first resonance frequency of the two-piece piezoelectric beam; once the first resonance frequency of the beam is known through running eigenfrequency study on the model, we vary the loading resistor to find the optimal resistance where the power reaches maximum: the external resistance was varied from 0.01 MΩ to 0.2 MΩ with 0.01 MΩ resolution to match the internal impedance of the beam. 0.01 MΩ interval resolution is arbitrarily chosen to limit the computation time to a reasonable level. e optimal resistance is found when a peak of the electric power appears in the scanning range
Equations (16) and (21) can be substituted into equation (20); the full-width half-maximum (FWHM) resonance bandwidth Δf can be expressed in a relation (22), where r is the internal resistance of the bimorph and L is the internal inductance of the equivalent electric circuit. e resistivity of the composite materials (PZTPZN, brass) and the internal inductance L of the bimorph both contribute to the length of the bandwidth of a bimorph, which can be expressed in the following equation: r
Summary
Equations (16) and (21) can be substituted into equation (20); the FWHM resonance bandwidth Δf can be expressed in a relation (22), where r is the internal resistance of the bimorph and L is the internal inductance of the equivalent electric circuit. Erefore, equation (32) is derived to approximate the rotational momentum of any trapezoidal shaped composite bimorph beam with a thin substrate along the center principle axis: L4. Equation (34) can be used to calculate the rotational momentum of a composite trapezoidal bimorph cantilever with a longer with W2 (60 mm), a shorter width W1 (2 mm), the length of L (60 mm), and total thickness of 0.65 mm.
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