Enhancing the Vibro-Acoustic Performance of Locally Resonant Metamaterial Plates via Feedback Control
Yuhang Wang, Lifeng Wang, Yuqiang Gao
Abstract: Challenges remain regarding vibration and noise reduction within the low-frequency range of the broadband. To address this limitation, this study proposes a locally resonant metamaterial plate model with active feedback control to enhance the vibro-acoustic performance. A vibro-acoustic coupling model of the metamaterial plate is established using the plane-wave expansion method. The sound transmission properties of the active feedback control metamaterial plate are computed analytically and further validated using finite-element simulations. The sound radiation and vibration properties are also analysed using the finite-element method. The sound transmission and sound radiation behavioural characteristics are further interpreted through the dispersion relations and the transmissibility. Under oblique incidence sound waves, the metamaterial plate clearly enhances the sound transmission loss at frequencies within the mass-law region and the coincidence region with a change in the control gain. Furthermore, the metamaterial effectively reduces the vibration of the metamaterial plate and decreases the sound pressure level in the air domain with a change in control gain under concentrated displacement excitation. This research enhances the vibro-acoustic performance of locally resonant metamaterials, providing novel control methods and significant guidance for designing active feedback control metamaterials in modern engineering systems.
文章链接：https://www.sciencedirect.com/science/article/pii/S099775382600077X
