双层墙对不同频率声音的隔声性能分析

利用整体振动模型,从理论上推导了双层墙的隔声量表达式,分析了在不同频率下的隔声效果,并且提出了与隔声相关的共振频率、吻合临界频率参量.分析发现,只有入射声波频率大于双层墙共振频率情况下才具有隔声的优越性,这为隔音双层墙的设计提供了理论基础.

Analysis on Sound Insulation of Double Wall in Different Frequency

By using integral vibration model,this paper proves the expression of sound insulation of double wall,analyzes the sound insulation effect in different frequencies,and puts forward the resonant frequency and anasto-mosis critical frequency which are related to sound insulation.The result shows that only when incident acoustic frequency is more than resonant frequency of double wall,the sound insulation can play a full role,which provides a theory fundamental of insulation double wall’s design.