When the non-homogenous layer is divided, the sound absorption performance of the structures is increased in low frequency.
结果表明，对非均匀层进行分层后，结构在低频时的吸声性能有所提高。
The roof system consists of main purlin, bottom plate, secondary purlin, absorption sound layer, insulating layer and faceplate.
屋面系统由主檩条、底板、次檩条、吸音层、保温层和面板组成。
The aim is to study the effects of dynamic mechanics properties and geometrical parameters of each layer material on the sound absorption properties of the multilayered polymer composites.
研究了多层高分子复合结构在斜入射声波作用下，各层材料动态力学性能参数和几何参数变化对其吸声性能的影响规律。
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