Measurement of Noise Emitted by Accelerating Road Vehicles
J2805
This SAE Standard is equivalent to ISO 362-1:2015 and specifies an engineering method for measuring the noise emitted by road vehicles of categories M and N under typical urban traffic conditions. It excludes vehicles of category L1, L2, L3, L4, and L5.The specifications are intended to reproduce the level of noise generated by the principal noise sources during normal driving in urban traffic. The method is designed to meet the requirements of simplicity as far as they are consistent with reproducibility of results under the operating conditions of the vehicle.The test method requires an acoustical environment that is obtained only in an extensive open space. Such conditions are usually provided for during:Measurements of vehicles for regulatory certification and/or type approval.Measurements at the manufacturing stage.Measurements at official testing stations.
Rationale: With new technologies (e.g. electric vehicles) we are expecting “Heavy” vehicles that accelerate fast enough to exceed 45 km/h at BB’ even if the entrance speed is near zero. When these vehicles go to certify there is no provision for them in the J2805_202005 technical specification. It would be beneficial to update J2805 before those vehicles become available so the method of test is clearly documented and the standard can be applied in in a consistent technology neutral manner. This revision provides an extension of the test procedure to "Heavy" vehicles with high acceleration potential.