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的振型图以及工具头端面的位移分布图，我们发现 Tang Yifan, Lin Shuyu. Band gaps of the phononic piezo-
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Acta Phys. Sin., 2016, 65(16): 104–112.
到明显的改善，形成较为均匀的振幅。
[8] 张思文, 吴九汇. 局域共振复合单元声子晶体结构的低频带隙
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二维声子晶体结构槽的圆柱形超声塑料焊接系统 Zhang Siwen, Wu Juhui. Low-frequency band gaps in
phononic crystals with composite locally resonant struc-
工具头的纵振动位移图，可知二维声子晶体结构的
tures[J]. Acta Phys. Sin., 2013, 62(13): 134302.
圆柱形工具头的位移分布更加均匀，且纵向振动的 [9] Wang G, Wen X, Wen J, et al. Two-dimensional lo-
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disposable multilayered phononic crystal liquid sensor
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