膜型声子晶体原胞结构隔声性能试验研究

Experimental study on sound insulation properties of thin film phononic crystals protocell structure

针对船舶舱室噪声低频控制问题,以一种薄膜型声子晶体原胞结构为研究对象,采用阻抗管法进行隔声性能试验研究,探究了不同配重质量、薄膜厚度和框架厚度对其隔声性能的影响规律。试验研究结果表明:配重质量、薄膜厚度和框架厚度增加均能提升薄膜型声子晶体的隔声性能,其中以配重质量影响最为明显;相较于无配重及单侧配重情况,双侧配重的薄膜型声子晶体隔声频段大幅拓宽,隔声量在中低频及高频显著增加,低频略有降低;增加薄膜厚度及框架厚度均可有效向低频拓宽薄膜型声子晶体的隔声频段并提高隔声量,以增加框架厚度,对低频隔声性能的提升更为明显。

To solve the problem of low frequency noise control in ship cabin,thin film phononic crystal cell structure was taken as the experimental object.Based on the impedance tube,the sound insulation performance of thin film phononic crystals was tested in order to explore the effects of counterweight mass,film thickness and frame thickness on the sound insulation performance,and then to optimize the design parameter combination.The experimental results show that the increase of counterweight mass,film thickness and frame thickness can improve the sound insulation performance of thin film phononic crystals,and the effect of counterweight quality is the most obvious.Compared with the thin film phononic crystals without counterweight and that with unilateral counterweight,the sound insulation frequency band of that with bilateral counterweight is greatly broadened.The sound insulation of the film phononic crystals is significantly increased in middle and low frequency,also in high frequency,and slightly decreased in low frequency.Increasing the thickness of the film and the frame can effectively broaden the sound insulation band and increase the sound insulation of the thin film phononic crystal at low frequency.The improvement of low-frequency sound insulation performance is more obvious by increasing the frame thickness.