Over deze norm
The present document describes a test method for measuring a quantity representative of the intrinsic characteristics of sound reflection from road noise reducing devices: the reflection index. The test method is intended for the following applications: - determination of the intrinsic characteristics of sound reflection of noise reducing devices to be installed along roads, to be measured either on typical installations alongside roads or on a relevant sample section; - determination of the in situ intrinsic characteristics of sound reflection of noise reducing devices 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 reducing devices (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 shall be given in a restricted frequency range and the reasons of the restriction(s) shall be clearly reported.
|Nederlandse titel||Verkeersgeluidbeperkende constructies langs wegen - Beproevingsmethode voor de bepaling van de akoestische prestatie - Deel 5: Intrinsieke kenmerken - In-situ waarden voor geluidsreflectie in vrije veld condities|
|Engelse titel||Road Traffic Noise reducing devices - Test method for determining the acoustic performance - Part 5: Intrinsic characteristics - In situ values of sound reflection under direct sound field conditions|