CAJ | 학술논문

本文将声波高吸收材料引入声子晶体，设计并制备一种由填充吸声棉的开缝钢管阵列形成的新型环形声子晶体结构，详细研究了吸声棉的声波高吸收性能对声子晶体禁带特性的影响。首先，实验测试了该声子晶体对声波的透射系数，作为对比，同时测试了在钢管内部不填充吸声棉时的透射系数；其次，建立了含有吸声棉的声子晶体有限元模型，采用有限元法仿真计算了该结构声子晶体的禁带特性；最后，通过改变散射体中吸声棉的比重，研究了吸声棉曝光度对禁带的影响规律。理论和实验结果表明，将吸声材料引入散射体内部时，材料的吸声特性并不会对禁带产生不利影响，而禁带外的声波则由于受到吸声材料的强烈吸收，表现出较低的透射系数，从而使声子晶体在整个频段表现出优良的降噪特性。
본문장성파고흡수재료인입성자정체，설계병제비일충유전충흡성면적개봉강관진렬형성적신형배형성자정체결구，상세연구료흡성면적성파고흡수성능대성자정체금대특성적영향。수선，실험측시료해성자정체대성파적투사계수，작위대비，동시측시료재강관내부불전충흡성면시적투사계수；기차，건립료함유흡성면적성자정체유한원모형，채용유한원법방진계산료해결구성자정체적금대특성；최후，통과개변산사체중흡성면적비중，연구료흡성면폭광도대금대적영향규률。이론화실험결과표명，장흡성재료인입산사체내부시，재료적흡성특성병불회대금대산생불리영향，이금대외적성파칙유우수도흡성재료적강렬흡수，표현출교저적투사계수，종이사성자정체재정개빈단표현출우량적강조특성。
In this paper, by introducing the sonic high absorption material into the phononic crystal, a new circular phononic crystal composed of periodic slotted steel tubes with glass wool filled is designed and manufactured, and the effect of the high absorption property of the glass wool on the band gap of the phononic crystal is investigated detailedly. Firstly, the transmission coefficient of the phononic crystal is measured by experiment platform, and as a comparison, the transmission coefficient of the phononic crystal composed of tubes without glass wool filled inside is also measured;Secondly, the phononic crystal finite element method which contains the glass wool is built and the band characteristics are calculated;Finally, by varying the ratio of the glass wool in the inclusion, the influence of the surface exposure degree of the glass wool on the band gap of the phononic crystal is studied. Both the theoretical and experimental results show that, the introduction of the glass wool doesn’t affect the original band gaps of PCs while it can strongly attenuate the acoustic wave outside the gap frequencies and make the transmission coefficient declining sharply, resulting in the phononic crystal exhibiting excellent noise reduction feature in the whole frequency range.