物理学报
物理學報
물이학보
2013年
9期
303-308
,共6页
高东宝%曾新吾*%周泽民%田章福
高東寶%曾新吾*%週澤民%田章福
고동보%증신오*%주택민%전장복
亥姆霍兹共振腔%声子晶体%缺陷模式%能量局域化
亥姆霍玆共振腔%聲子晶體%缺陷模式%能量跼域化
해모곽자공진강%성자정체%결함모식%능량국역화
Helmholtz resonator%phononic crystal%defect mode%acoustic energy localization
基于亥姆霍兹共振腔单元设计并制作了一种一维局域共振型声子晶体,针对结构中存在点缺陷的情况,进行了实验研究.实验结果表明,由于点缺陷的存在,局域共振型声禁带中出现了缺陷模式,并且在缺陷单元周围引起了能量的局域现象,与理论结果符合较好.缺陷单元从两个不同的方向趋近于完美单元时,缺陷模式分别按照不同的规律变化,但是越靠近禁带边缘,所局域的能量就越多.另外,当缺陷单元共振频率小于完美单元共振频率时,局域能量主要集中在声波导内;反之,局域能量则主要集中在共振腔内.本研究对设计新型低频声滤波装置及高声强集中装置具有一定意义.
基于亥姆霍玆共振腔單元設計併製作瞭一種一維跼域共振型聲子晶體,針對結構中存在點缺陷的情況,進行瞭實驗研究.實驗結果錶明,由于點缺陷的存在,跼域共振型聲禁帶中齣現瞭缺陷模式,併且在缺陷單元週圍引起瞭能量的跼域現象,與理論結果符閤較好.缺陷單元從兩箇不同的方嚮趨近于完美單元時,缺陷模式分彆按照不同的規律變化,但是越靠近禁帶邊緣,所跼域的能量就越多.另外,噹缺陷單元共振頻率小于完美單元共振頻率時,跼域能量主要集中在聲波導內;反之,跼域能量則主要集中在共振腔內.本研究對設計新型低頻聲濾波裝置及高聲彊集中裝置具有一定意義.
기우해모곽자공진강단원설계병제작료일충일유국역공진형성자정체,침대결구중존재점결함적정황,진행료실험연구.실험결과표명,유우점결함적존재,국역공진형성금대중출현료결함모식,병차재결함단원주위인기료능량적국역현상,여이론결과부합교호.결함단원종량개불동적방향추근우완미단원시,결함모식분별안조불동적규률변화,단시월고근금대변연,소국역적능량취월다.령외,당결함단원공진빈솔소우완미단원공진빈솔시,국역능량주요집중재성파도내;반지,국역능량칙주요집중재공진강내.본연구대설계신형저빈성려파장치급고성강집중장치구유일정의의.
In this paper, a local resonant phononic crystal is designed and fabricated based on Helmholtz resonators. Experiment is carried out to study the defect mode of the structure, in which a point defect is introduced. Due to the coupling of the defect cell and perfect cells, a narrow pass band appears in the local resonant forbidden band. Meanwhile, acoustic energy localization effect is observed around the defect resonator at the frequency of defect mode which changes with the defect parameter. However, the defect mode is close to the edge of the forbidden band, the localized energy is high. In addition, if the resonant frequency of the defect unit is smaller than that of the perfect unit, the localized energy is mostly distributed in the waveguide. In contrast, the energy is mostly localized in the resonators when the defect unit frequency is larger than that of the perfect unit. This work will be of help for designing new acoustic functional devices of filters and concentrators.