车用废纺双密度毡吸声隔声性能研究

Research on sound absorption and insulation of waste dual density felt for automobile

利用涤棉混纺纤维制得由一层紧密毡料和一层蓬松毡料构成的双密度毡,并测试了双密度毡的吸声和隔声性能。测试结果表明:双密度毡对高频噪声的吸收效果较好,而对低频噪声的吸收效果较差;在一定范围内增加双密度毡的厚度,可以相应提高其吸声性能;材料的隔声性能与自身构件的振动频率有关,本试验样品的最高和最低隔声量分别出现在声波频率为3 150和5 000 Hz处。

Using the cotton-polyester blended fiber to make dual density felt which consist of a layer of compact felt and a layer of fluffy felt, and test the sound insulation and absorption performance of two types of dual density felts. Test results indicated that dual density felt have good ability in absorption for high frequency sound, and not good for low frequency sound. Within certain premises, add thickness of dual density felt would increase ability in absorption for sound. The sound insulation performance of material is related to its vibration frequency, the highest and lowest sound insulation of the sample was in frequency of 3150 and 5 000 Hz in respectively.