不同测量表面对喷射虹吸式坐便器冲洗噪声测试的影响

Study of the influence of different measuring surfaces on the flushing noise measurement of jet siphon toilet

以喷射虹吸式陶瓷坐便器为研究对象,按照国标GB/T 3768—1996《声学声压法测定噪声源声功率级反射面上方采用包络测量表面的简易法》规定的声学通用性导则,依据包络声源测试原理,探索建立了平行六面体和半球测量表面两种声学监测数学模型,制定了测量表面、测点阵列、测试参数、测试环境、测试步骤、安装条件、仪器设备、数据处理和不确定度评定等一系列关键技术内容;并采用单因素方差分析法,考察了在上述两种测量表面条件下同一坐便器声源样品冲洗噪声测量结果之间的离散性差异程度。研究表明,当显著性差异水平为5%时,按照平行六面体及半球测量表面法对5件陶瓷坐便器样品进行连续3次冲洗噪声测定后,每件样品的6个平均声压级及声功率级测量结果间均无显著性差异。

In this paper, the ceramic jet siphon toilet is taken as the research object, and based on the Chinese standard - GB/T 3768-1996 （（Acoustics-Determination of sound power level of noise sources using sound pressure-Survey method using an enveloping measurement surface over a reflecting plane）） , two acoustic monitoring mathematical models for parallelepiped and hemisphere measuring surfaces are established according to the enveloping sound source testing principle, and a series of key technical contents, such as measuring surface, measuring point array, test parameters, test environment, testing procedure, installation conditions, instrumentation, data processing and uncertainty evaluation are specified. The single factor variance analysis method is used to study the uniformity of the test results for the above two different measuring surfaces of the same toilet sample. After 3 times successively measuring flushing noise for 5 ceramic toilet samples with the parallelepiped and hemisphere measuring surface methods, it is verified that when the significant difference level of data analysis is 5%, there are no significant differences between 6 test results of average sound pressure level and sound power level for each sample.