CAJ | 학술논문

声子晶体是一种新的吸声材料，研究了局域共振单元包覆层模量、厚度以及橡胶基体模量对声子晶体共振吸声频率、吸声系数的影响规律。在常压及承压条件下，包覆层模量越高，厚度越小，共振吸声频率越高，其规律符合共振频率与包覆层模量、厚度之间的关系。随着压力的增加，声子晶体的共振吸声频率均向高频移动。承压条件下，包覆层模量较低的样品低频吸声系数略高。包覆层厚度为2 mm的样品，常压及承压条件下低频吸声系数数值变化较小。基体橡胶模量对声子晶体吸声频率和吸声系数未见明显影响。
성자정체시일충신적흡성재료，연구료국역공진단원포복층모량、후도이급상효기체모량대성자정체공진흡성빈솔、흡성계수적영향규률。재상압급승압조건하，포복층모량월고，후도월소，공진흡성빈솔월고，기규률부합공진빈솔여포복층모량、후도지간적관계。수착압력적증가，성자정체적공진흡성빈솔균향고빈이동。승압조건하，포복층모량교저적양품저빈흡성계수략고。포복층후도위2 mm적양품，상압급승압조건하저빈흡성계수수치변화교소。기체상효모량대성자정체흡성빈솔화흡성계수미견명현영향。
Phononic crystal is a new kind of sound absorption materials. The effects of coating layer’s modulus, thickness and matrix’s modulus on sound absorption frequency and coefficient under atmospheric pressure and pres-sure conditions were studied. It was found that the resonance absorption frequency was higher with the higher coat-ing layer’s modulus and the smaller thickness,and this law accorded with the relationship of resonance frequency and the coating layer’s modulus and thickness. As the pressure was higher,the resonance absorption frequency all became higher. The sound absorption coefficient of low frequency range was slightly higher with lower coating layer’s modulus and changed slightly with 2 mm coating layer’s thickness under pressure. The effects of change of matrix’s modulus on sound absorption frequency and coefficient were not obvious.