铸铁排水管与硬聚氯乙烯排水管噪声的研究

通过测定铸铁排水管和硬聚氯乙烯(PVC-U)排水管排水噪声值,在不同流量、不同测试距离、不同测试高度条件下分析铸铁排水管和PVC-U排水管噪声的变化规律。经拟合得出铸铁排水管和PVC-U排水管噪声变化符合y=-alnx b的规律,声波传播方式为柱面波。同一点位同一流量下,在距离声源50cm处PVC-U排水管的噪声值比铸铁排水管大7dB(A)左右,在距离声源300cm处PVC-U排水管的噪声值比铸铁排水管大3dB(A)左右,而且PVC-U排水管噪声随距离增加衰减的速率比铸铁排水管大。

Study on noise of cast iron drainage pipe and unplasticized polyvinyl chloride drainage pipe

Based on test of the drainage noise of cast iron drainage pipe and unplasticized polyvinyl chloride (PVC-U)drainage pipe, the laws of noise were summarized in terms of different flows, different distances and different heights. Through the curve fitting, the experimental results showed that the cast iron drainage pipe and PVC-U drainage pipe noise laws varies in accordance with y=-alnx b and their acoustic modes of transmission were the cylindrical waves. With the same position and same flow, the noise of PVC-U drainage pipe was 7 dB(A)higher than that of the cast iron drainage pipe when the distance from noise source was 50 cm, 3 dB(A)higher when 300 cm, and the noise decay rate by increase of distance of PVC-U drainage pipe was faster than that of cast iron drainage pipe.