塑料排水管道包扎材料降噪性能研究
發(fā)布時間：2019-01-12 10:05
【摘要】：噪聲是現(xiàn)代科技發(fā)展帶來的公害之一,安靜的生活和工作環(huán)境是人們所向往的,建筑排水管道產(chǎn)生的噪聲是家庭噪聲的主要來源之一。本實驗采用一套更為簡易的排水管道噪聲評價方法,對多種塑料排水管道包扎材料的降噪性能進行評價,并利用這一方法,進一步研究材料復合包扎時的降噪性能及包扎材料間的相互作用。實驗根據(jù)聲學測量理論設計了簡易的排水管道噪聲及包扎材料降噪性能評價方法。通過單層包扎降噪實驗得出,隔聲氈的降噪效果最好,插入損失為14.5dB；聚氨酯,隔聲毯和隔聲墊的降噪性能次之,插入損失分別為8.4dB,8.6dB和8.5dB；橡塑和聚乙烯的降噪性能相對較差,插入損失分別為4.3dB和1.3dB;EPDM插入損失最小,為-0.4dB。不管是采用正弦噪聲還是白噪聲作為輸入信號,隔聲氈都具有最佳的降噪性能,在分別輸入正弦噪聲和白噪聲信號時,聲能量損失百分比分別能達到85.4%和96.45%。實驗以1/3倍頻程中心頻率作為自變量,輸入白噪聲信號,將所測得的插入損失作為因變量作出某厚度下不同材料的“頻率—插入損失”關系曲線,然后對所得曲線進行擬合得出其“頻率—插入損失”擬合曲線方程。采用同種材料進行復合包扎時,包扎兩層聚氨酯具有最好的降噪效果,插入損失為18.4dB,其次為兩層隔聲氈,其插入損失為18.1dB,兩層隔聲毯的插入損失為14.2dB,兩層橡塑的插入損失為14.1dB,兩層隔聲墊的插入損失為7.7dB,兩層EPDM的降噪效果最差,插入損失為-0.2dB。采用不同種材料進行復合包扎時,內(nèi)層橡塑和外層隔聲毯組合具有最好的降噪效果,并且得出：相同厚度,相同材質(zhì)的降噪材料在進行復合包扎時,其內(nèi)層的包扎材料會對外層材料的降噪性能產(chǎn)生不同的影響。
[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.
【學位授予單位】：北京建筑大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TB535;TU823
本文編號：2407658
[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.
【學位授予單位】：北京建筑大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TB535;TU823
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