Note: High-efficiency broadband acoustic energy harvesting using Helmholtz resonator and dual piezoelectric cantilever beams

作者：Yang, Aichao; Li, Ping^*; Wen, Yumei; Lu, Caijiang; Peng, Xiao; He, Wei; Zhang, Jitao; Wang, Decai; Yang, Feng

来源：Review of Scientific Instruments, 2014, 85(6): 066103.

DOI：10.1063/1.4882316

• Acoustic energy harvesting
• Acoustic pressures
• Helmholtz resonators
• Higher efficiency
• Mechanical quality factors
• Multimode couplings
• Piezoelectric cantilever beams
• Piezoelectric composite

A high-efficiency broadband acoustic energy harvester consisting of a compliant-top-plate Helmholtz resonator (HR) and dual piezoelectric cantilever beams is proposed. Due to the high mechanical quality factor of beams and the strong multimode coupling of HR cavity, top plate and beams, the high efficiency in a broad bandwidth is obtained. Experiment exhibits that the proposed harvester at 170-206 Hz has 28-188 times higher efficiency than the conventional harvester using a HR with a piezoelectric composite diaphragm. For input acoustic pressure of 2.0 Pa, the proposed harvester exhibits 0.137-1.43 mW output power corresponding to 0.035-0.36 mu Wcm(-3) volume power density at 170-206 Hz.

• 出版日期2014-6
• 单位重庆大学