BS EN 16272-4:2016描述了测定声音固有特性的试验方法 安装在铁路隔音屏障顶部的附加装置的衍射。试验方法规定: 噪声上边缘附近几个参考点的声压级测量 带或不带安装在顶部的附加装置的屏障。增加了系统的内在有效性 装置计算为添加和不添加装置时测量值之间的差值， 校正高度的任何变化。换句话说，这里描述的方法给出了 在相同高度的简单屏障上改变顶部边缘的形状和材料的好处。这是附加设备的固有特性，前提是源和接收器的位置 标准化。在实践中，当添加的设备放置在现有屏障上时，它会提高 高度，这提供了额外的屏蔽，这取决于源和接收器的位置； 这 本欧洲标准不考虑额外筛查。本试验方法适用于以下应用:安装在隔音屏障上的附加装置的初步鉴定（室外或室内）；确定实际使用中增加的装置的声衍射指数差；添加设备的设计规范与安装后的实际性能数据的比较 完成施工工作；验证添加设备的长期性能（重复使用 方法）；新产品的交互设计过程，包括安装手册的制定。该测试方法既可以在现场使用，也可以在专门制作的样品上使用 这里描述的方法。频率为100 kHz和1/3倍频程之间的结果。 如果无法在指示的整个频率范围内获得有效的测量结果，则 应给出受限频率范围内的结果，并说明受限原因 明确报道。根据频率数据计算单个数字额定值。交叉引用:EN 16272-3-2EN 16272-6EN ISO 354EN 61672-1ISO/IEC指南98-3GUM:1995ISO 13472-1:2002EN 60942EN 61260购买本文件时可获得的所有现行修订均包含在购买本文件中。

BS EN 16272-4:2016 describes a test method for determining the intrinsic characteristics of sound diffraction of added devices installed on the top of railway noise barriers. The test method prescribes measurements of the sound pressure level at several reference points near the top edge of a noise barrier with and without the added device installed on its top. The intrinsic effectiveness of the added device is calculated as the difference between the measured values with and without the added devices, correcting for any change in height. In other words, the method described here gives the acoustic benefit of changing the shape and materials of the top edge over a simple barrier of the same height. This is an intrinsic characteristic of the added device, provided that the source and receiver positions are standardized. In practice, when the added device is placed over an existing barrier, it raises the height and this provides additional screening, depending on the source and receiver positions; this additional screening is not considered in this European Standard.The test method is intended for the following applications:preliminary qualification, outdoors or indoors, of added devices to be installed on noise barriers;determination of the sound diffraction index difference of added devices in actual use;comparison of design specifications of an added device with actual performance data after the completion of the construction work;verification of the long term performance of added devices (with a repeated application of the method);interactive design process of new products, including the formulation of installation manuals.The test method can be applied both in situ and on samples purposely built to be tested using the method described here.Results are expressed as a function of frequency, in one-third octave bands between 100 Hz and 5 kHz. If it is not possible to get valid measurements results over the whole frequency range indicated, the results shall be given in the restricted frequency range and the reasons for the restriction(s) shall be clearly reported. A single-number rating is calculated from frequency data.Cross References:EN 16272-3-2EN 16272-6EN ISO 354EN 61672-1ISO/IEC Guide 98-3GUM:1995ISO 13472-1:2002EN 60942EN 61260All current amendments available at time of purchase are included with the purchase of this document.