Abstract: In order to discuss the relationship between the composite st ructure and acoustic insulation property ,
and explore a new approach to reduce the low -middle f requency noise , the composites with two different
arrangement s of glass fabric , vertical st ructure and laminated st ructure , in polyvinyl chloride resin were fabricated.The experiment s for acoustic insulation property were carried out in a reverberation-anechoic chambers measuring system. As a result , the arrangement of glass fabric has an obvious influence on the acoustic insulation property in the developed composites. When the thickness of the composites exceeds 5 mm under the same thickness and surface density , the composites with vertical fabric structure show the bet ter acoustic insulation property in low f requencies and low - middle f requencies than that with laminated fabric st ructure. The difference due to the vertical and laminated st ructures will become larger with the increase of sample thickness. Therefore , it is shown that changing the arrangement of the reinforcements can improve the acoustic insulation property of low f requencies and low-middle f requencies.