摘要
This paper presents a locally resonant phononic crystal with excellent noise reduction in the low-frequency range as a soundproofing plate in mufflers.A locally resonant phononic crystal is established,and the bandgap range of the phononic crystal is analyzed by using COMSOL software.Taking the partition plate in the muffler as the object,the acoustic-solid coupling is studied to analyze the sound insulation characteristics of the locally resonant phononic crystal.A phononic crystal plate-like structure is established to analyze its noise reduction performance in the muffler.The results indicate that the locally resonant phononic crystal exhibits favorable low-frequency sound insulation performance within a bandgap range below 200 Hz.At 160 Hz,the noise reduction is 15 dB higher than that of ordinary partition plates.As the number of layers of the phononic crystal plate increases,its noise reduction effect gradually enhances,while the magnitude of the noise reduction increment tends to diminish.At 160 Hz,the single-,double-and triple-layer plates achieve peak reductions of 47,53 and 57 dB,respectively.Compared with the double-layer phononic crystal plate,the composite of the locally resonant phononic crystal plate and the steel plate has an average noise reduction of 5 dB higher.Through research and analysis of the composite locally resonant phononic crystal plates,more feasible combined structures can be provided for future muffler structural design.
提出了一种在低频范围具有良好降噪效果的局域共振声子晶体并应用于消声器隔声板。首先,建立一种局域共振声子晶体,使用COMSOL软件对声子晶体的带隙范围进行分析。其次,以消声器隔板为研究对象,通过声固耦合研究,分析局域共振声子晶体的隔声特性。最后,建立声子晶体板状结构,分析其在消声器中的降噪性能。研究结果表明:局域共振声子晶体的带隙范围在200 Hz以下可产生较好的低频隔声效果。在160 Hz时比普通隔板降噪高出15 dB;随着声子晶体板层数增加,其降噪效果逐渐增强,但降噪幅度逐渐减小。在160 Hz时,单层、双层和三层声子晶体板的峰值降噪分别为47、53和57 dB。与双层声子晶体板相比,钢复合局域共振声子晶体板平均降噪高出5 dB。研究分析复合局域共振声子晶体板可为未来消声器结构设计提供更可行的组合结构。
基金
National Natural Science Foundation of China(No.51705545)。
