This SAE Recommended Practice is equivalent to ISO Standard 362–1981 except for the differences detailed in the Appendix, and includes the modifications adopted by WP29 in ECE R51.
This SAE Recommended Practice specifies an engineering method for measuring the noise emitted by accelerating highway vehicles of all types (except motorcycles) in intermediate gears with full utilization of the available engine power.
The method is designed to meet the requirements of simplicity and reproducibility of results under realistic vehicle operating conditions.
Measurements relate to operating conditions of the vehicle which give the highest noise level consistent with urban driving and which lead to reproducible noise emissions. Therefore, an acceleration test at full throttle from a stated engine or vehicle speed is specified.
The test method calls for an acoustical environment which can only be obtained in an extensive open space.
If measurements have to be carried out on the road in an acoustical environment which does not fulfill the requirements stated in this SAE Recommended Practice, it should be recognized that the results obtained may deviate appreciably from the results obtained using the specified conditions.
The results obtained by this method give an objective measure of the noise emitted under the prescribed conditions of test. However, it is necessary to consider the fact that the subjective appraisal of the annoyance of different classes of motor vehicles is not simply related to the indications of a sound level meter.
The Light Vehicle Exterior Sound Level Standards Committee is part of the Vehicle Engineering Sound Level Forum Committee that reports to the Vehicle Systems Group of the Motor Vehicle Council. The Committee is responsible for developing and maintaining SAE Standards, Recommended Practices, and Information Reports related to the measurement of sound levels in passenger cars and light trucks including pickups, vans and sport utility vehicles. While the sound measurement techniques have remained constant for a number of years, changes in the vehicle powertrain configurations require updates to ensure comparable operating methods for the variety of products. The committee has also undertaken the review and coordination of comments related to the procedures being developed by the International Organization for Standardization's (ISO) Working Group 42, Measurement of noise emission (external) from road vehicles. The committee will also review the technical validity of any governmental regulations promulgated by the United States or other countries where US products are being sold. Participants in the SAE Light Vehicle Exterior Sound Level Standards Committee include OEMs, suppliers, consulting firms, government, and other interested parties.
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MEASUREMENT OF NOISE EMITTED BY ACCELERATING HIGHWAY VEHICLES
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MEASUREMENT OF NOISE EMITTED BY ACCELERATING HIGHWAY VEHICLES
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