CAJ | 학술논문

基于准周期 Fibonacci 序列，提出了一维对称准周期序列固液介质声子晶体。利用传输矩阵法，数值研究了弹性波在其中的透射特性，以及局域谐振模的基本特征。弹性波正入射时，对低序列声子晶体，在声子带隙的中心频率处出现局域谐振模，且在其左右对称地出现两条局域谐振模。在较高序列结构的声子晶体中，仅在中心频率处出现一条局域谐振模。当弹性波斜入射时，声子带隙和谐振模都略微向高频方向移动。弹性波以较大角度斜入射时，只有低频弹性波透射。
기우준주기 Fibonacci 서렬，제출료일유대칭준주기서렬고액개질성자정체。이용전수구진법，수치연구료탄성파재기중적투사특성，이급국역해진모적기본특정。탄성파정입사시，대저서렬성자정체，재성자대극적중심빈솔처출현국역해진모，차재기좌우대칭지출현량조국역해진모。재교고서렬결구적성자정체중，부재중심빈솔처출현일조국역해진모。당탄성파사입사시，성자대극화해진모도략미향고빈방향이동。탄성파이교대각도사입사시，지유저빈탄성파투사。
On basis of quasi-periodic Fibonacci sequence,a symmetrical quasi-periodic phononic crystal composed of solid and liquid medium was proposed.Propagation of elastic wave in it and its local field resonant modes were investigated numerically with the transfer matrix method.It was shown that for the phononic crystal with lower order sequence,at the central frequency of the phononic band gap,a local field resonant mode appears;then,two local field resonant modes appear symmetrically at the left side and the right one of the central resonant mode;but for symmetrical quasi-periodic phononic crystal with higher order sequence,only there is a local field resonant mode at the central frequency;moreover,for an elastic wave oblique incident,the band gap and resonant modes slowly shift to higher frequency range;the resonant modes in the band gap can act as a super narrow bandwidth filter with multiple channels;for an elastic wave with larger incident angle,the lower frequency elastic wave can propagate through the higher order quasi-periodic phononic crystal.