MA Kejing, CHEN Huyue, ZHANG Wenming. A Self-powered Sensor of Acoustic Metamaterial and Helmholtz Resonator Structure[J]. Mechanical Science and Technology for Aerospace Engineering, 2024, 43(1): 110-116.
MA Kejing, CHEN Huyue, ZHANG Wenming. A Self-powered Sensor of Acoustic Metamaterial and Helmholtz Resonator Structure[J]. Mechanical Science and Technology for Aerospace Engineering, 2024, 43(1): 110-116.DOI: 10.13433/j.cnki.1003-8728.20220235.
self-powered acoustic sensors have attracted extensive attention. However
it is difficult to further improve piezoelectric sensors′ sensitivity and other vital indicators. Acoustic metamaterials can manipulate sound waves
while traditional materials cannot
thus providing a new method for designing new acoustic sensors. This paper designs a self-powered sensor of acoustic metamaterial and Helmholtz resonance structure. It also verifies that the defective acoustic metamaterial can focus acoustic energy. In addition
the Helmholtz resonator can further amplify the acoustic energy focused on the defective acoustic metamaterial. Its transmission ratio is more than 40 mV/Pa and meets the demand of a small self-powered sensor. The experimental results show that compared with the acoustic metamaterial sensor
the acoustic metamaterial sensor based on the Helmholtz resonator has higher sensitivity and signal-to-noise ratio.