以开发小周期尺寸低频率带隙声子晶体为目标,首先给出了固定周期尺寸下带隙起始频率最低对应的材料比计算方法,又验证了等效密度及等效弹性模量在声子晶体带隙计算中的正确性.据此开发了周期尺寸为0.04m,带隙范围为200Hz～1200Hz的声子晶体,并对计算结果进行了实验验证.
For exploiting phononic crystals with small periodic size and low frequency bandgap, a material ratio calculation method is proposed at fixed period with the lowest starting frequency, and then it was verificated that the equivalent density and equivalent elastic modulus in the phononic crystal bandgap calculation were correct. According to these rules we prepared phononic crystals with a periodic size of 0.04m, handgap of 200Hz-1200Hz, and the calculated results were validated by experiments.
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