John A. Volpe National Transportation Systems Center (U.S.)

DOT-VNTSC-NPS-08-03

Tech Report

Wyoming

John A. Volpe National Transportation Systems Center (U.S.)

AGR-PUBLIC AND TRIBAL LANDS-PUBLIC AND TRIBAL LANDS ; NTL-ENERGY AND ENVIRONMENT-Environment Impacts ;

Sounds associated with oversnow vehicles, such as snowmobiles and snowcoaches, are an important management concern at Yellowstone and Grand Teton National Parks. The John A. Volpe National Transportation Systems Center’s Environmental Measurement and Modeling Division is supporting the National Park Service with its on-going Winter Use Planning program. As part of this support, acoustic measurements of ten snowcoaches and six snowmobiles were made at the south entrance to Yellowstone National Park from the 26th through the 28th of February 2008. Measurement methodologies were guided by SAE J1161 and SAE J192. There were two primary objectives: 1) to determine which snowcoaches had the Best Available Technology (BAT) with respect to noise emissions, and 2) to determine if there was a significant difference between snowmobile sound levels when tested using two revisions of SAE J192. Based on analysis of the data, it appears that among the snowcoaches, the Yellowstone Expeditions’ modified Dodge B530 snowcoach would be an excellent candidate for BAT classification. It was also found that measurements guided by the two revisions of SAE J192 had very similar results.

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VX82 - EM355

Volpe National Transportation Systems Center, Technical Reference Center