Experimental study on acoustic energy harvesting using single and double PZT film configuration in Helmholtz resonator

Abstract

Acoustic energy harvesting has been the main attraction for many researchers because of energy scarcity. Low-frequency energy harvesting is a highly complicated process. However, the physical characteristics of piezoelectric materials can be utilized to extract energy from low-frequency acoustic or vibration-based waves. In this study, experiments have been conducted on acoustic energy harvesting from low-frequency sound sources using Helmholtz resonator with single and double PZT film configurations. Based on the results obtained from the experiment it is clear that double film configuration is better for the purpose. Under the condition of 100Hz constant frequency single film configuration has been able to give 80.2 mV whereas for double film configuration the value of output voltage was 237.6 mV. A rectifying circuit was simulated using commercial software which is run by the output of the noise barrier. The noise barrier of the double film configuration can produce a total power of 268.8 mW where one film configuration has a total power output of 136.77 mW. Modified Helmholtz resonator noise barrier of double film configuration can be used to power up low power-consuming devices and greatly applicable for noise reduction in big cities and industrial areas.