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- W590928899 abstract "This paper reports the results of sound pressure and intensity measurements collected at the National Center for Asphalt Technology (NCAT) Test Track. For evaluation of the on-board sound intensity (OBSI) method, the sound intensity measurements are compared to corresponding sound pressure measurements. The Test Track comprises a variety of different hot-mix asphalt (HMA) surface mixtures including dense-graded Superpave and open-graded friction course mixtures that were evaluated as part of the noise study. Sound testing was done using the NCAT close proximity (CPX) noise trailer and the OBSI method was used to measure sound intensity levels with three different vehicles and three different tires. All the noise testing was done at a speed of 72 kph (45 mph). An analysis of variance (ANOVA) was done to determine the significance of mixture type, vehicle and test tire on the noise levels. It was found that each of these statistically significantly influenced the noise levels. The analyses indicate the differences between sound intensity and pressure levels on the different asphalt mixtures evaluated allowing a ranking of these in terms of noise performance. The data suggest that the type of vehicle used to measure sound intensity is not as critical as the tire used." @default.
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- W590928899 date "2010-01-01" @default.
- W590928899 modified "2023-10-17" @default.
- W590928899 title "Evaluation of the OBSI Method" @default.
- W590928899 hasPublicationYear "2010" @default.
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