نوع مقاله : مقاله ترویجی
دانشکده مهندسی برق، دانشگاه شهید بهشتی، تهران، ایران
عنوان مقاله [English]
Today, due to limited access to some places or unfavorable weather conditions, power transmission from the power plant and storage in the battery is very expensive. This has led researchers to find a way to solve this problem, so the use of environmental energy such as noise, motion (or displacement), light, wind, etc. has opened a new chapter for engineers. In this paper, a piezoelectric plate is designed and simulated by modeling a human eardrum. This plate is one of the components of the acoustic-electric converter, which is able to collect the noise of crowded and busy environments and convert them into electrical energy. By recording and analyzing audio signals from two highly polluted locations in MATLAB software, the two frequencies at which the highest sound weight occurred were considered as the intensification frequency. Then, using the software of the COMSOL and the obtained data, the natural frequency of the first mode shape of the converter geometry is equal to the frequency of the amplified sound. The most optimal diameter of the piezoelectric plate was 8 cm and the energy was equal to 10.5 microwatts per second and the voltage changes were 12 volts. In order to store and use the obtained voltage, a circuit is provided for this purpose.