摘要
被动噪声控制工程中,中低频噪声的隔离和吸收是控制难点,有效方法之一是采用新型声子晶体。提出一种迷宫开口管形声子晶体结构,并根据Bloch定理和Helmholtz方程,使用有限法对该声子晶体进行带隙计算,并对其在不同频率范围的隔声量进行研究。结果表明该声子晶体在500 Hz左右、1400 Hz左右以及1600~2000 Hz的范围内有明显的隔声量高峰,与其带隙相对应,在带隙范围内的隔声能力提高明显。经结构参数优化后,该型声子晶体在1000~1500 Hz范围内的记权隔声量提高8.73 dB,优化后的声子晶体在中低频噪声控制方面有潜在的应用场景。
In passive noise control engineering,isolation and absorption of middle and low frequency noise are the difficult points.One of the effective methods to overcome the difficulty is to adopt new phonon crystals.In this paper,a labyrinth open tubular phonon crystal structure was proposed.Based on the Bloch theorem and Helmholtz equation,the band-gap of the phonon crystal was calculated by means of the finite method.The sound insulation of the phonon crystal in different frequency ranges was also studied.The results show that the phonon crystal has an obvious sound insulation peak in the ranges of 500 Hz,1400 Hz and 1600-2000 Hz,corresponding to its band gap,and the sound insulation ability is improved significantly in the band gap ranges.After the optimization of structural parameters,the recording weight and sound insulation of the phonon crystal in the range of 1000-1500 Hz are increased by 8.73 dB,and the optimized phonon crystal has potential application values in the control of low and medium frequency noises.
作者
杜旭雅
张军
DU Xuya;ZHANG Jun(School of Locomotive and Rolling Stock Engineering,Dalian Jiaotong University,Dalian 116028,Liaoning,China)
出处
《噪声与振动控制》
北大核心
2025年第5期104-109,172,共7页
Noise and Vibration Control
关键词
声学
声子晶体
带隙特性
隔声
噪声控制
acoustics
phonon crystal
band-gap characteristics
sound insulation
noise control
