航空科学技术2024，Vol.35Issue(12)：47-53,7.DOI:10.19452/j.issn1007-5453.2024.12.006
含包覆层型局域共振声子晶体的带隙特性研究
Characteristic Research of Band Gaps in Local Resonant Phononic Crystals with Claddi
摘要
Abstract
Low-frequency vibration and noise reduction of civil aircraft is a practical problem that needs to be solved urgently,and the local resonant phononic crystal with coating has excellent low-frequency noise reduction performance.Mastering the bandgap characteristics is a critical step in solving the problem.Based on the basic model of single cladding phononic crystal,the energy band structure of double cladding phononic crystal under the same working condition is analyzed.The modal analysis of the upper and lower boundary of the band gap is carried out.The reason of the low frequency band gap in the double cladding layer is discussed.The influence of structure parameters on the band gap of the coated phononic crystal is further studied.It is found that with the increase of the thickness of the cladding layer,the overall band gap moves to low frequency,the number of band gaps increases,and the bandwidth changes little.For double cladding phononic crystals,with the increase of the ratio of the outer cladding thickness to the inner cladding thickness,the band gap moves to the low frequency,the initial frequency of the first band gap gradually decreases,the bandwidth gradually decreases,and the second band gap gradually opens,and increases with the increase of the thickness ratio.The results of this paper will provide some theoretical guidance for practical engineering application.关键词
含包覆层型声子晶体/能带结构/模态分析Key words
phononic crystals with cladding/energy band structure/modal analysis分类
数理科学引用本文复制引用
孙向洋,延浩,燕群..含包覆层型局域共振声子晶体的带隙特性研究[J].航空科学技术,2024,35(12):47-53,7.基金项目
航空科学基金(20200015023003) Aeronautical Science Foundation of China(20200015023003) （20200015023003）
