耦合条件下微穿孔板吸声特性研究  

Acoustic absorption characteristics of a flexible micro-perforated panel cavity with a flexible back one

作　　者：侯九霄 朱海潮 袁苏伟 HOU Jiuxiao;ZHU Haichao;YUAN Suwei(Naval Institute of Ship Vibration and Noise,Wuhan 430033,China;National Key Laboratory on Ship Vibration and Noise,Wuhan 430033,China)

机构地区：[1]海军舰船振动与噪声研究所,武汉430033 [2]船舶振动噪声重点实验室,武汉430033

出　　处：《振动与冲击》2020年第15期156-162,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51675529)。

摘　　要：使用轻薄材料制成的微穿孔板和背腔板,其自身的振动对其吸声特性的影响不容忽视。基于模态叠加法建立了弹性背腔微穿孔板的理论模型,研究了弹性微穿孔板和弹性背腔板的刚度、面密度、张紧力和阻尼对其吸声特性的影响,对比了不同边界条件下的弹性背腔微穿孔板吸声系数。随后,利用试验数据和有限元分析结果验证弹性背腔微穿孔板吸声理论。结果表明,在弹性背腔板和弹性微穿孔板的模态频率处,微穿孔板的吸声系数得到提高。通过合理配置弹性微穿孔板和弹性背腔板的参数,能够有效拓宽其吸声带宽。Vibrations of a micro-perforated panel and a flexible back cavity one made of lightweight materials affecting their acoustic absorption characteristics can’t be ignored. Here, based on the modal superposition method, the theoretical model for a flexible micro-perforated panel cavity with a flexible back panel(FMPPCFBP) was established to study effects of the two panels’ stiffness, surface density, tension and damping on FMPPCFBP’s sound absorption characteristics, and compare FMPPCFBP’s sound absorption coefficients under different boundary conditions. Test data and finite element analysis results were used to verify FMPPCFBP’s sound absorption theory. Results showed that at modal frequencies of the flexible micro-perforated panel(FMPP) and the flexible back panel(FBP), FMPP’s sound absorption coefficient is improved;FMPP’s sound absorption bandwidth can be broadened through reasonably configuring parameters of FMPP and FBP.

关 键 词：结构-声耦合 微穿孔板 吸声特性 模态叠加 弹性背腔板 

分 类 号：TB532[理学—物理]