南京大学学报（自然科学版）2017，Vol.53Issue(1)：56-60,5.DOI:10.13232/j.cnki.jnju.2017.01.008
宽带低反射式通风声屏障
Broadband ventilated acoustic barrier with low reflection
摘要
Abstract
We propose a method based on the band structure of rectangular lattice type phononic crystal to realize the function of local noise barrier through manipulating the wave vector of the transmitted wave.The acoustic barrier has the ability to guide the incident sound wave with low reflection and creates a partial quiet area.The principle we propose neither rely on the effect of viscous absorption nor negative equivalent acoustic parameters which ensures the similarity of sound intensity and acoustic wavefront between the incident wave and transmitted wave.Simulation results show that sound insulation in the frequency range from 7750 Hz to 10000 Hz has a loss of more than 35 dB and the maximum sound pressure level loss reaches up to 50 dB contrasting acoustic wave propagating in the free field.Thin plates consisting phononic crystals insulate sound wave while leaving a gap in acoustic wavelength scale which are different from the traditional method of sound insulation based on wall with the characters of huge mass density and large thickness.With the characters above,our design may have deep implication in practical applications.关键词
声子晶体/能带结构/部分禁带/完全带隙/声屏障Key words
phononic crystal/band structure/partial band gap/absolute band gap/acoustic barrier分类
数理科学引用本文复制引用
张海龙,李丽娟,梁彬,杨京,程建春..宽带低反射式通风声屏障[J].南京大学学报（自然科学版）,2017,53(1):56-60,5.基金项目
国家自然科学基金(11634006,81127901),中兴通讯产学研合作基金 （11634006,81127901）
