The energy harvesting system by using internal acoustic energy at both side excitation

Inhalt:
In recent years, the energy harvesting technology has attracted a great deal of attention. The Sustainable Development Goals (SDGs), proposed by the United Nations in 2015 call for improvements in global energy efficiency by 2030, and improvements in the harvesting efficiency by understanding vibration will make a significant contribution to this goal. Especially, the power generation systems using piezoelectric elements have been widely studied. On the other hand, sound energy has few applications. Therefore, the authors proposed the system converts the vibration energy of the end plates into electrical energy for the effective use of the sound energy. The system is amplified both sound and vibration energy by promoting the mechanical-acoustic coupling phenomena. And the system is composed of a cylindrical structure with two thin end plates. The end plates are installed piezoelectric element at the center of the plates. In this study, we experimentally investigated the relationship between the power generation characteristics and the mechanical-acoustic coupling phenomena when both end plates are excited in the system. As a result, in most cases, the power generation characteristics strongly depend on the vibration of the end plates. In addition, it was also found to depend on the effect of the internal sound field of the cylinder when the mechanical-acoustic coupling is promoted.