European Committee for Standardization

Railway applications - Track - Noise barriers and related devices acting on airborne sound propagation - Test method for determining the acoustic performance - Part 5: Intrinsic characteristics - In situ values of sound reflection under direct sound field conditions
 N CEN/TS 16272-5

Annotation

This Technical Specification describes a test method for measuring a quantity representative of the intrinsic characteristics of sound reflection from railway noise barriers: the reflection index.

The test method is intended for the following applications:

- determination of the intrinsic characteristics of sound reflection of noise barriers to be installed along railways, to be measured either on typical installations alongside railways or on a relevant sample section;

- determination of the in situ intrinsic characteristics of sound reflection of noise barriers and claddings in actual use;

- comparison of design specifications with actual performance data after the completion of the construction work;

- verification of the long term performance of noise barriers and claddings (with a repeated application of the method).

The test method is not intended for the following applications

- determination of the intrinsic characteristics of sound reflection of noise reducing devices to be installed in reverberant conditions, e.g. inside tunnels or deep trenches.

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 should be given in a restricted frequency range and the reasons of the restriction(s) should be clearly reported.