Abstract
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.
Highlights
The development and use of new energy, especially renewable energy, has become the principle of energy construction and development in various countries, and the research on environmental energy harvesters is a major research hotspot [1].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 through piezoelectric, magnetoelectric and friction power generation mechanisms, the acoustic energy is converted into electrical energy
When the high-speed jet passes through the cavity, vortex-induced vibration will occur in the cavity, forming a feedback growth loop, which will cause the energy to be continuously converted into the sound field, if the sound field energy is collected, the damage caused by the sound radiation to the mechanical structure can be effectively reduced, at the same time, energy waste can be avoided, so the research of acoustic energy harvester has important academic value and engineering application background
The generation of airflow-induced sound is closely related to the phenomenon of vortex-induced vibration, and vortex-induced vibration is mainly affected by the geometry of the resonant cavity and the incoming flow parameters [3], so the resonant cavity is the key to the design of acoustic energy harvesters
Summary
The development and use of new energy, especially renewable energy, has become the principle of energy construction and development in various countries, and the research on environmental energy harvesters is a major research hotspot [1]. When the high-speed jet passes through the cavity, vortex-induced vibration will occur in the cavity, forming a feedback growth loop, which will cause the energy to be continuously converted into the sound field, if the sound field energy is collected, the damage caused by the sound radiation to the mechanical structure can be effectively reduced, at the same time, energy waste can be avoided, so the research of acoustic energy harvester has important academic value and engineering application background. In terms of engineering applications, the research of acoustic energy harvesters can effectively reduce the damage of the cavity near-field acoustic radiation to the electronic instruments and meters in the weapon compartment. The cavity-based acoustic energy harvesters can be classified by energy conversion methods, including piezoelectric effect, electromagnetic induction, friction power generation, and acoustic crystal resonance power generation [5]
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