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.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 56<\/td>\n | Annex\u00a0A (informative)Low-frequency limit and window width A.1 General <\/td>\n<\/tr>\n | ||||||
| 61<\/td>\n | Annex\u00a0B (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 <\/td>\n<\/tr>\n | ||||||
| 63<\/td>\n | Annex\u00a0C (normative)Template of test report on sound reflection index of road traffic noise reducing devices C.1 General <\/td>\n<\/tr>\n | ||||||
| 66<\/td>\n | C.2 Test setup (example) <\/td>\n<\/tr>\n | ||||||
| 67<\/td>\n | C.3 Test object and test situation (example) <\/td>\n<\/tr>\n | ||||||
| 69<\/td>\n | C.4 Test Results (example) C.4.1 Part 1 \u2013 Results in tabular form <\/td>\n<\/tr>\n | ||||||
| 70<\/td>\n | C.4.2 Part 2 \u2013 Results in graphic form C.5 Uncertainty (example) <\/td>\n<\/tr>\n | ||||||
| 72<\/td>\n | Annex\u00a0D (informative)Indoor measurements for product qualification D.1 General D.2 Parasitic reflections D.3 Reverberation time of the room <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" 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<\/b><\/p>\n |