This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Measurement of Minimum Noise Emitted by Road Vehicles
- Ground Vehicle Standard
- J2889/1_201109
- Issued
Sector:
Issuing Committee:
Language:
English
Scope
This SAE Standard is derived from SAE J2805 and specifies an engineering method for measuring the minimum noise emitted by road vehicles. The specifications reproduce the level of noise which is generated by the principal vehicle noise sources consistent with minimal noise emission 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 which is only obtained in an extensive open space. Such conditions usually exist during:
-
Measurements of vehicles for regulatory certification
-
Measurements at the manufacturing stage
-
Measurements at official testing stations
The results obtained by this method give an objective measure of the noise emitted under the specified conditions of test. It is necessary to consider the fact that the subjective appraisal of the annoyance, perceptibility, and/or detectability of different motor vehicles or classes of motor vehicles due to their noise emission are not simply related to the indications of a sound measurement system. As annoyance, perceptibility, and/or detectability are strongly related to personal human perception, physiological human condition, culture, and environmental conditions, there are large variations and therefore these terms are not useful as parameters to describe a specific vehicle condition.
Spot checks of vehicles chosen at random rarely occur in an ideal acoustical environment. If measurements are carried out on the road in an acoustical environment which does not fulfill the requirements stated in this SAE Standard, the results obtained may deviate appreciably from the results obtained using the specified conditions.
In addition, this standard provides an engineering method to assess the performance of external sound generation systems intended for the purpose of providing acoustic information to pedestrians on a vehicle’s operating condition. This information is reported as objective criteria related to the external sound generation system’s sound pressure level, frequency content, and changes in sound pressure level and frequency content as a function of vehicle speed. As such, these measures can provide pedestrians with information on the location, speed, acceleration, and deceleration behavior of a vehicle.
Rationale
This Surface Vehicle Standard provides a method to measure the minimum noise emission of road vehicles and external sound generation systems intended for the purpose to provide acoustic information to pedestrians. This standard provides a performance-based and technology neutral test procedure. This standard reflects the development of engine and propulsion technologies which have noise emission characteristics that cannot be correctly tested under existing SAE Standards.
Topic
Data Sets - Support Documents
No Datasets Available
Issuing Committee
Safety and Human Factors Standards Steering Committee
The Safety & Human Factors Steering Committee reports to the Motor Vehicle Council. The steering committee oversees SAE standard, recommended practice, and information report development and maintenance of its subcommittees, which include safety-related topics involving driver performance and interactions with vehicles and driving automation systems. The steering committee and subcommittees are responsible for human factors challenges in evaluation methods, human-machine interface design criteria, and user-automation system interaction. The steering committee provides input to the ISO TC22/SC39 Road Vehicle - Ergonomics subcommittee.
Reference
* Redlines comparisons are available for those standards
listed in the Revision History that contain a radio button. A
redline comparison of the current version against a revision is
accomplished by selecting the radio button next to the standard and
then selecting 'compare'. At this time, Redline versions only exist
for some AMS standards. SAE will continue to add redline versioning
with ongoing updates to SAE MOBILUS.