BS EN 16272-4:2016 PDF Download

BS EN 16272-4:2016 is a standard that describes a test method for determining the acoustic performance of added devices installed on the top of railway noise barriers. Specifically, it focuses on the intrinsic characteristics of sound diffraction under direct sound field. The test method requires measurements of the sound pressure level at various reference points near the top edge of a noise barrier, both with and without the added devices installed.

The purpose of this test method is to evaluate the effectiveness of the added devices in modifying the shape and materials of the top edge of the barrier to reduce airborne sound propagation. The difference in measured values between with and without the added devices is calculated to determine the intrinsic effectiveness of the added device. However, it should be noted that this method does not consider any additional screening provided by the increased height of the barrier when the devices are installed.

This standard is applicable for various purposes, including the preliminary qualification of added devices, determination of sound diffraction index difference in actual use, comparison of design specifications with actual performance data, verification of long-term performance, and interactive design processes. The test method can be applied in situ or on samples specifically built for testing.

Results are expressed in frequency bands between 100 Hz and 5 kHz, and a single-number rating is calculated from the frequency data. Annex A provides additional guidance for indoor measurements.