一种新型双振子声子晶体带隙特性研究

The Band Gap Characteristics of a New Double-oscillator Phononic Crystal

为获得较宽频率范围弹性波耗散性能,并有效控制减振降噪频率带宽,提出一种新型双振子声子晶体结构,研究其能带和传输特性,并利用COMSOL Multiphysics软件计算该声子晶体结构起始频率、截止频率以及相应的振动模态,分析该结构带隙形成机理,以及散射体密度和尺寸对该声子晶体带隙的影响规律。研究表明:双振子声子晶体结构带隙打开是基体中长波行波与振子的谐振相互耦合作用产生的结果。研究结果可为工业装备的噪声与振动控制提供一种新方法。

Manufacturing industry has become the focus of global competition.Vibration and noise are important factors limiting the development of manufacturing industry.In order to effectively control vibration and noise,obtain elastic wave dissipation in a wide frequency range,and effectively control the frequency range,a new double vibrator phononic crystal structure is proposed.The energy band structure and transmission characteristics are studied.The initial frequency,cut-off frequency and the corresponding vibration modes are calculated and analyzed by using the finite element software COMSOL Multiphysics,and the formation mechanism of the band gap is expounded.The influence law of the density and size of the scattering body on band gap of the phononic crystal is analyzed.The results show that the opening of the band gap is resulted from the coupling of the long wave and traveling wave in the matrix.Through the sound insulation test,it is found that the sound wave transmission has obvious attenuation effect in the same frequency range.This study has provided a new method for noise and vibration reduction for industrial equipment.