Research progress of cavity-based acoustic energy harvester

The acoustic energy collector uses the cavity acoustic mode to capture the acoustic signal in a certain frequency range at the mouth of the cavity, achieves fluid-solid coupling and amplifies the acoustic vibration excitation, and then through piezoelectric, magnetoelectric and friction power generation mechanisms, the acoustic energy is finally converted into electrical energy. The overview of the research progress of cavity-based acoustic energy harvesters has found that acoustic energy harvesters are usually composed of resonant cavity, diaphragm, and transducer materials, and the resonant cavity is the key to the design of acoustic energy harvester. Analyze the influence of cavity structure on sound pressure amplification to provide reference for the research and application of acoustic energy harvester. The piezoelectric type is the main energy conversion method, the magnetoelectric type is the auxiliary, and the friction power generation and the acoustic crystal resonance power generation have also become a new research direction, because of the widest application range of hybrid power generation, it has become a future development trend.