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塑料排水管道包扎材料降噪性能研究

发布时间:2019-01-12 10:05  文章来源:笔耕文化传播
【摘要】:噪声是现代科技发展带来的公害之一,安静的生活和工作环境是人们所向往的,建筑排水管道产生的噪声是家庭噪声的主要来源之一。本实验采用一套更为简易的排水管道噪声评价方法,对多种塑料排水管道包扎材料的降噪性能进行评价,并利用这一方法,进一步研究材料复合包扎时的降噪性能及包扎材料间的相互作用。实验根据声学测量理论设计了简易的排水管道噪声及包扎材料降噪性能评价方法。通过单层包扎降噪实验得出,隔声毡的降噪效果最好,插入损失为14.5dB;聚氨酯,隔声毯和隔声垫的降噪性能次之,插入损失分别为8.4dB,8.6dB和8.5dB;橡塑和聚乙烯的降噪性能相对较差,插入损失分别为4.3dB和1.3dB;EPDM插入损失最小,为-0.4dB。不管是采用正弦噪声还是白噪声作为输入信号,隔声毡都具有最佳的降噪性能,在分别输入正弦噪声和白噪声信号时,声能量损失百分比分别能达到85.4%和96.45%。实验以1/3倍频程中心频率作为自变量,输入白噪声信号,将所测得的插入损失作为因变量作出某厚度下不同材料的“频率—插入损失”关系曲线,然后对所得曲线进行拟合得出其“频率—插入损失”拟合曲线方程。采用同种材料进行复合包扎时,包扎两层聚氨酯具有最好的降噪效果,插入损失为18.4dB,其次为两层隔声毡,其插入损失为18.1dB,两层隔声毯的插入损失为14.2dB,两层橡塑的插入损失为14.1dB,两层隔声垫的插入损失为7.7dB,两层EPDM的降噪效果最差,插入损失为-0.2dB。采用不同种材料进行复合包扎时,内层橡塑和外层隔声毯组合具有最好的降噪效果,并且得出:相同厚度,相同材质的降噪材料在进行复合包扎时,其内层的包扎材料会对外层材料的降噪性能产生不同的影响。
[Abstract]:Noise is one of the public hazards brought by the development of modern science and technology. People yearn for a quiet living and working environment, and the noise generated by building drainage pipes is one of the main sources of family noise. In this experiment, a more simple method of noise evaluation of drainage pipes is used to evaluate the noise reduction performance of various plastic drainage pipe wrapping materials, and this method is used to evaluate the noise reduction performance of plastic drainage pipes. The noise reduction performance and the interaction between the bandaging materials were further studied. Based on acoustic measurement theory, a simple evaluation method for noise reduction of drainage pipes and bandaging materials is designed. Through the experiment of single layer bandaging noise reduction, the noise reduction effect of soundproof felt is the best, the insertion loss is 14.5 dB, the noise reduction performance of polyurethane, acoustical blanket and soundproof pad is the second, the insertion loss is 8.4 dB and 8.5 dB, respectively. The noise-reducing properties of rubber and polyethylene were relatively poor, and the insertion loss of 4.3dB and EPDM were the smallest and -0.4 dB, respectively. Whether sinusoidal noise or white noise is used as input signal, soundproof felt has the best noise reduction performance. When sinusoidal noise and white noise signal are inputted separately, the percentage of acoustic energy loss can reach 85.4% and 96.45% respectively. In the experiment, 1 / 3 octave center frequency is used as independent variable, white noise signal is input, and the measured insertion loss is taken as dependent variable to make the "frequency-insertion loss" curve for different materials with certain thickness. Then, the "frequency-insertion loss" curve equation is obtained by fitting the obtained curve. When the same material is used for composite wrapping, the best noise reduction effect is obtained by wrapping two layers of polyurethane, the insertion loss is 18.4dB, the insertion loss is 18.1 dB, and the insertion loss of two-layer soundproof blanket is 14.2 dB, the loss of insertion loss is 18.1dB, the insertion loss of two-layer soundproof blanket is 14.2dB. The insertion loss of two layers of rubber and plastic was 14.1 dB, that of two layers of sound insulation pad was 7.7 dB, and that of two layers of EPDM was the worst, and the loss of insertion was -0.2 dB. When different kinds of materials are used for composite dressing, the combination of inner layer rubber and plastic and outer sound insulation blanket has the best effect of noise reduction, and it is concluded that the same thickness and the same material are used in the composite bandaging of noise reduction materials. The inner layer bandaging material will have different effects on the noise reduction performance of the outer layer material.
【学位授予单位】:北京建筑大学
【学位级别】:硕士
【学位授予年份】:2013
【分类号】:TB535;TU823

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