Power performance of circular piezoelectric diaphragm generators

Abstract

Energy generation performance of a piezoelectric generator depends mainly on several elements such as the structural style, boundary conditions, geometry parameters, materials, vibration-source frequency, and external load. To obtain the optimal energy-harvesting device, the Raleigh method is used to establish the analysis model of circular piezoelectric composite diaphragms. Simply supported and clamped boundary conditions were considered. The relationships between the output power and the structural parameters of piezoelectric composite diaphragms, and the external load resistance and frequency were shown. Given the correlative material parameters and boundary conditions, the output power, using structural parameters, external load, or vibrating frequency as variables, can be calculated. Simulation results show that there are optimal structural parameters and load for a composite diaphragm to achieve the maximum output power. A piezoelectric diaphragm generator with given dimensions tends to achieve higher output power under clamped boundary conditions than that under simply supported boundary conditions.

Shoe embedded air pump type piezoelectric power harvester

“…There are some researchers that have presented a theoretical analysis of unimorph piezoelectric diaphragms with simply supported and clamped boundary conditions as a potential tool for generating electrical energy from blood pressure variation for low pressure (5330 Pa) [49][50][51][52][53][54][55][56][57][58][59]. Moreover, Kim et al [50][51][52] have developed and tested a decoupled PZT circular diaphragm with a clamped edge.…”

“…Moreover, Kim et al [50][51][52] have developed and tested a decoupled PZT circular diaphragm with a clamped edge. The power performance of circular bimorph piezoelectric diaphragm generators (Figure 2.2) have also been analyzed [57][58]. Tang [57] has also mentioned that the bimorph diaphragm has the capability to be inserted in the heels of shoes.…”

“…The power performance of circular bimorph piezoelectric diaphragm generators (Figure 2.2) have also been analyzed [57][58]. Tang [57] has also mentioned that the bimorph diaphragm has the capability to be inserted in the heels of shoes. All above researchers tries to reach analytical models for predicting output power of diaphragm generators.…”

“…The output power of a circular piezoelectric diaphragm depends on the material properties of piezo and substrate, diaphragm geometry parameters, working frequency, boundary conditions, external electric resistance, and external force [50][51][52][53][54][55][56][57]. Tang [57] has presented power performance equations of the circular bimorph piezoelectric diaphragm generator which is applied in this thesis to predict output power of the harvester in Figure 2.2. For an ideal piezoelectric model (no mechanical damping or ), the diaphragm power output is defined as [57]: ω (2.5) Equation (2.5) shows that the average harvester output power (P) depends on open circuit voltage ( ), piezo free capacitance ( ), vibration or working frequency (ω) and external electrical resistance (R).…”

“…Tang [57] has presented power performance equations of the circular bimorph piezoelectric diaphragm generator which is applied in this thesis to predict output power of the harvester in Figure 2.2. For an ideal piezoelectric model (no mechanical damping or ), the diaphragm power output is defined as [57]: ω (2.5) Equation (2.5) shows that the average harvester output power (P) depends on open circuit voltage ( ), piezo free capacitance ( ), vibration or working frequency (ω) and external electrical resistance (R). The free capacitance is also a function of diaphragm dimensions.…”