This SAE Recommended Practice establishes the method to determine Sound Level of a snowmobile under typical trail operating conditions.
Snowmobiles have different engine power levels that depends on the model.
Rationale
This new procedure attempts to determine the average sound pressure level of a snowmobile during typical trail operation. It consists of averaging a steady vehicle speed SPL with a wide-open throttle acceleration SPL. Weighting is applied on both SPL prior to averaging. This new standard defines a sound level value that is more representative of general public perception. Reduction of the sound level emitted by a snowmobile based on this method would translate to a higher acknowledgement by the general public.
The weighting factor determination is based on ISO 362-1:2015 used to determine the urban sound level of motorcycles, based on vehicle power to mass ratio (PMR). The PMR of currently available snowmobiles ranges between 75 and 400. That range of PMR yields to weighting factors ranging from 42.5 to 52.5%. Using a median value of 47.5% for all models introduces an error in the order of 0.5 dBA and therefore is used in this document to simplify its use.
The Snowmobile Technical Committee develops and maintains SAE Standards, Recommended Practices, and Information Reports related to snowmobiles and their components or systems. The committee also maintains liaison with groups such as the Snowmobile Safety and Certification Committee, Inc. (SSCC), Transport Canada, the Canadian Standards Association (CSA), SAE-related committees and other organizations as necessary. Participants in the SAE Snowmobile Technical Committee include OEMs, suppliers, consulting firms, government and other interested parties.
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Sound Level Determination for Snowmobiles under Typical Trail Operating Conditions
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Sound Level Determination for Snowmobiles under Typical Trail Operating Conditions
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