Generation of electric potential and noise suppression from an integrated system of acoustic energy conversion

Abstract

ABSTRACT Nowadays, the demand for electronics has increased, which requires some amount of input supply. This energy supply is now shifted from conventional to new techniques such as solar energy, wind energy and many other so-called free energies. Another type of free energy in an environment is sound energy; sometimes, it is referred to as noise. Hence, this article aims to convert this noise into electrical output to utilise it and drive small electronic applications. Nevertheless, the noise is uncomfortable for humans; hence, this experiment does not only convert energy but also reduces the noise amplitude. Here, the polyvinylidene difluoride (PVDF) piezoelectric element converts mechanical vibrations into electricity. It is employed in a foam block, and the sound source is placed at different heights of the foam block, just to analyse the output signal after sound impingement from different angles. Here, the maximum output peak of 80 mV is seen at 650 Hz and 82.9 dB. Likewise, different peaks of outputs have been observed. Also, noise reduction has been observed in this experiment; the maximum reduction of noise amplitude has occurred in the frequency range of 1100 Hz to 1200 Hz.