Design of tunable low-frequency acoustic energy harvesting barrier for subway tunnel based on an optimized Helmholtz resonator and a PZT circular plate

• DOI: 10.1016/j.egyr.2022.06.042
• Publication Date: 2022-06-28T09:22:26Z
• Authors: Dan Li; Man Hu; Fei Wu; Keling Liu; Mingyuan Gao; Zegang Ju; Jiang Zhao; Anhong Bao
• Keywords: Helmholtz resonator; Helmholtz free energy

This paper presents a tunable, low-frequency acoustic energy harvesting barrier, which contains the following four parts: noise acquisition input module, Helmholtz resonator optimization resonant frequency tuning and electricity generation module. The aim of this study is to make rational use huge inside subway tunnel convert it into electric power sensing detecting equipment lighting along railway. In work, optimal harvester unit part were pertinently designed increase output unit. Experimental results show that one system can generate 317.5 mV instantaneous voltage 100.8 μW maximum at 100 dB, verifies efficiency practicability proposed barrier. device has broad application prospect be adapted different environments, including high-speed railway tunnels, highway urban etc., with excellent conversion efficiency. These provide valuable ideas for design practical new multi-functional barriers in future.