J3120_201810 Sound Level Determination for Snowmobiles under Typical Trail Operating Conditions

Issued

10/09/2018

Features
Issuing Committee
Scope
Content
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
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/J3120_201810
Pages
2
Citation
SAE International Recommended Practice, Sound Level Determination for Snowmobiles under Typical Trail Operating Conditions, SAE Standard J3120_201810, Issued October 2018, https://doi.org/10.4271/J3120_201810.
Additional Details
Publisher
Published
Oct 9, 2018
Product Code
J3120_201810
Content Type
Recommended Practice
Status
Issued
Language
English

Revisions