Citation

Janello C, Donavan PR. Transp. Res. Rec. 2018; 2672(24): 134-143.

Copyright

(Copyright © 2018, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

10.1177/0361198118788428

PMID

unavailable

Abstract

The NCHRP Project 25-45 was initiated in 2013 to measure noise sources during heavy truck pass-bys using the acoustic beamforming method. Phase I testing included measurements from four relatively flat sites in Northern California, where heavy trucks traveled under moderate vehicle speeds. Sixteen additional sites in North Carolina were tested as part of Phase II. These sites had varying pavement grades, faster/slower posted speed limits, and varying operating conditions. The source mapping results from both phases were used to develop noise versus height profiles. The profiles were not significantly dependent on site and operating conditions. Average profiles were developed for each site to demonstrate that the predominant noise source was tire/pavement noise, with engine/powertrain being the secondary source; elevated sources occurred rarely and were equal to or greater than tire/pavement for only 0.5% of the total 1,289 trucks measured, while only 1.8% were within 5 dB(A) of the pavement source and 4.7% were within 10 dB(A).

Language: en