摘要
基于随机入射平面波建立混响声场激励的加筋板隔声计算模型,通过对试验模型数值计算,二者结果基本吻合;计算存在静压力时加筋板隔声特性表明,存在静压力时加筋板基频移动会致低频隔声量显著增加,压力增加到一定程度时隔声量基本不再增加;此可为存在预应力的实际结构物隔声量计算提供参考。
Based on the concept of plane wave propagation,a model of sound transmission through stiffened plates excited by an acoustic diffuse field under static pressure was developed. Simulation results based on the model structure are very close to experiment results in the literature. Sound transmission through stiffened plates under static pressure was then investigated. The results show that static pressure may cause the base frequency of the stiffened plate to shift and lead to transmission loss at low frequencies. When the pressure increases to a certain level,the sound transmission loss is no longer increasing. The results might contribute to the literature of sound transmission computation through structures with initial stresses.
引文
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