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BSI 23/30468476 DC 2023

BSI 23/30468476 DC 2023

$13.70

Draft BS EN 1793-5. 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

Published By Publication Date Number of Pages
BSI 2023 74
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This European Standard 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.

PDF Catalog

PDF Pages PDF Title
56 Annex A (informative)Low-frequency limit and window width
A.1 General
61 Annex B (informative)Measurement uncertainty
B.1 General
B.2 Measurement uncertainty based upon reproducibility data
B.3 Standard deviation of repeatability and reproducibility of the sound reflection index
63 Annex C (normative)Template of test report on sound reflection index of road traffic noise reducing devices
C.1 General
66 C.2 Test setup (example)
67 C.3 Test object and test situation (example)
69 C.4 Test Results (example)
C.4.1 Part 1 – Results in tabular form
70 C.4.2 Part 2 – Results in graphic form
C.5 Uncertainty (example)
72 Annex D (informative)Indoor measurements for product qualification
D.1 General
D.2 Parasitic reflections
D.3 Reverberation time of the room

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BSI 23/30468476 DC 2023
$13.70