舰船科学技术  2019, Vol. 41 Issue (6): 15-18 PDF

Research on the low frequency sound insulation properties of a thin plate phononic crystal
WANG Tian, WANG Gui-bo, ZHANG Ruo-jun, JIANG Min
Applied Acoustic Research Center, Shipbuilding Information Center of China, Beijing 100101, China
Abstract: In this paper, we studied on the low frequency sound insulation properties of a thin plate phononic crystal. The thin plate phononic crystal consists of a single layer homogeneous thin plate and a square-cycle frame. Firstly, we analyzed the sound insulation characteristics and acoustic vibration mode of the thin plate phononic crystal by finite element method. Further, we analyzed the influence of parameters such as the original cell period and the thickness of the plate on sound insulation. The results show that the thin plate phononic crystal has good sound insulation performance in the low frequency range, especially at the designed resonant frequency 315 Hz, the sound insulation is increased by 9 decibels compared with the single layer homogeneous plate of the same quality. Furthermore, the test sample was made by 3D printing technology and the sound insulation experiments was carried out. The test result are in good agreement with the theoretical calculation result. This research provides a good technical support for the design of lightweight sound insulation materials and low frequency noise control.
Key words: low frequency sound insulation     phononic crystal     finite element method
0 引　言

1 模型建立与仿真计算

 图 1 薄板声子晶体及原包结构示意图 Fig. 1 Schematic of thin plate phononic crystal and original package structure

 图 2 隔声曲线对比 Fig. 2 Contrast of sound insulation curves

 图 3 薄板声子晶体在声波激励作用下的位移场（其中（a，b）为315 Hz，（c，d）为630 Hz） Fig. 3 The displacement field of thin plate phononic crystal under the action of acoustic wave (where (a and b) are at 315 Hz and (c and d) are at 630 Hz)

 图 4 薄板声子晶体隔声曲线与原包周期的关系 Fig. 4 The relationship between the sound insulation curve of thin plate phononic crystal and the original packet period

 图 5 薄板声子晶体隔声曲线与薄板厚度的关系 Fig. 5 The relationship between sound insulation curve of thin plate phononic crystal and thickness of thin plate

 图 6 框架与薄板质量比的对隔声曲线的影响 Fig. 6 Effect of mass ratio of frame to thin plate on the sound insulation curve
2 样品制备及试验验证

 图 7 薄板声子晶体样品实物图 Fig. 7 Sample of thin plate phononic crystal

 图 8 隔声性能试验测试 Fig. 8 The test system of sound insulation performance

 图 9 隔声曲线对比 Fig. 9 Comparison of sound insulation curves
3 结　语

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