This document specifies a method of comparing traffic noise on different road surfaces for various compositions of road traffic for the purpose of evaluating different road surface types. Sound levels representing either light or heavy vehicles at selected speeds are assigned to a certain road surface. The method is applicable to traffic travelling at constant speed, i.e. free-flowing conditions at posted speeds of 50 km\/h and upwards. For conditions where traffic is not free flowing, such as at junctions and where the traffic is congested, the method is not applicable. A standard method for comparing the noise characteristics of road surfaces gives road and environment authorities a tool for establishing common practices or limits regarding the use of road surfaces meeting certain noise criteria. However, it is not within the scope of ISO 11819 (all parts) to suggest such criteria. The statistical pass-by (SPB) method is suitable for use for the following main purposes: \u2014 to classify road surfaces according to their influence on traffic noise (surface classification); \u2014 to assist in verifying conformity of production of road surfaces; \u2014 to evaluate acoustic performance of road surfaces throughout operation relative to new condition; \u2014 to evaluate the influence of different road surfaces on traffic noise at sites irrespective of condition and service time; \u2014 to evaluate acoustic performance of a road surface relative to a reference surface. Due to practical restrictions, the method cannot be applied at all possible locations. However, the backing board method can allow some locations to be tested that were not previously acceptable. Clause 5 gives a general description of the SPB method.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | European foreword Endorsement notice <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | Foreword <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | Introduction <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 3 Terms and definitions 3.1 Types of noise 3.2 Measurement method 3.3 Road speed categories <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 3.4 Vehicle categories 3.5 Measured noise quantities <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 3.6 Road surface terms applicable in this method 3.7 Backing board terms 4 Symbols and abbreviated terms <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 5 Measuring principle 6 Instrumentation 6.1 Instruments for acoustical measurements 6.1.1 General 6.1.2 Verification <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 6.2 Instruments for vehicle speed measurements 6.2.1 General 6.2.2 Verification 6.3 Instruments for temperature measurements 6.3.1 General 6.3.2 Verification 7 Test sites 7.1 Selection of measuring site <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 7.2 Deviations from free-field conditions 7.3 Considerations of guard rails and other barriers which can reflect or screen the sound 7.4 Surface between the tested road surface and microphone <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 7.5 Backing board 8 Traffic conditions 8.1 Vehicle classification 8.2 Selection of vehicles for measurement <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 8.3 Minimum number of vehicles <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 8.4 Road speed categories 9 Measuring procedure 9.1 Microphone position <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 9.2 Calibrations <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 9.3 Sound level measurement 9.4 Frequency spectrum measurement 9.5 Speed measurement 9.6 Temperature measurement 10 Meteorological conditions 10.1 Wind 10.2 Temperature 10.3 Recommendations on road surface moisture <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 11 Background noise 12 Normalization of data 12.1 Compensating for the effect of the additional (higher) microphone position 12.2 Combining vehicle categories H2 and H3+ into a common heavy vehicle category H <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 12.3 Noise versus speed – regression analysis (for passenger cars) 12.4 Noise versus speed \u2013 normalization to reference speed (for heavy vehicles) <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 12.5 Noise versus speed \u2013 normalization of frequency spectra for vehicles in categories P and H 12.6 Determination of SPB sound level at reference speeds 12.7 Useful speed range for the speed normalization 12.8 Correction of sound levels according to temperature <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 13 Measurement uncertainty <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 14 Reported data 14.1 General information <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | 14.2 Information relating to the location and appearance of the test site 14.3 Information relating to the type and construction of the tested road surface 14.4 Information relating to the condition of the tested surface and environmental factors 14.5 Road speed category and vehicle information 14.6 Measured and calculated sound level and speed data <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 14.7 Others <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Annex A (normative) Vehicle categories <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Annex B (informative) Determination of the statistical pass-by index (SPBI) <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Annex C (informative) The backing board variant <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | Annex D (informative) Adding 95 % confidence intervals <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | Annex E (informative) Validity and stability of the method <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | Annex F (informative) Reference road surface <\/td>\n<\/tr>\n | ||||||
| 48<\/td>\n | Annex G (informative) Monitoring the stability of sound levels of vehicle fleets <\/td>\n<\/tr>\n | ||||||
| 50<\/td>\n | Annex H (informative) Uncertainty <\/td>\n<\/tr>\n | ||||||
| 53<\/td>\n | Annex I (informative) Example of test report <\/td>\n<\/tr>\n | ||||||
| 57<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Acoustics. Measurement of the influence of road surfaces on traffic noise – Statistical pass-by method<\/b><\/p>\n |