梁 板 结 构 中 弯 曲 波 的 低 频 宽 带 完 美 吸 收

Perfect absorption already has a mature theory in the fields of electromagnetism and acoustics，but in the field of elastic waves，there are few corresponding studies. This paper theoretically studies a single-resonator system on a beam, and obtains that its absorption limit is only 0.5. By introducing a lossy-lossless resonator group, the absorption efficiency of the system is improved, achieving perfect absorption with an absorption coefficient of nearly 1. Furthermore, a low-frequency broadband perfect absorption structure for the beam was designed through parallel coupling between oscillators, and optimization was carried out on this basis. Ten resonators are used to achieve broadband absorption from 350 Hz to 600 Hz, with an average absorption coefficient higher than 0.95. This structure can also have a good absorption effect on an infinite plate, with an absorption coefficient exceeding 0.95 for incident angles between -40° and 40°. The research in this paper provides ideas and methods for the design of beam-plate broadband perfect absorption structures，expands the research on resonators in suppressing bending wave transmission，and is expected to develop a way of vibration suppression.