Localization of tire/pavement noise source regions

Richard J. Ruhala; Courtney B. Burroughs

doi:10.3397/1.2984149

Localization of tire/pavement noise source regions

Noise Control Engineering Journal ◽

10.3397/1.2984149 ◽

2008 ◽

Vol 56 (5) ◽

pp. 318 ◽

Cited By ~ 1

Author(s):

Richard J. Ruhala ◽

Courtney B. Burroughs

Keyword(s):

Noise Source ◽

Source Regions ◽

Pavement Noise

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Effect of Rotor Tip Speed and Stator Sweep on Rotor-Stator Interaction

Volume 5: Turbo Expo 2004, Parts A and B ◽

10.1115/gt2004-54293 ◽

2004 ◽

Author(s):

Oliver V. Atassi ◽

Christopher M. Hall

Keyword(s):

Diagnostic Test ◽

Correlation Length ◽

Radial Distribution ◽

Noise Source ◽

Guide Vane ◽

Phase Variation ◽

Periodic Component ◽

Source Regions ◽

Rotor Stator Interaction ◽

Radial Phase

Data taken in the Source Diagnostic Test of the unsteady pressure on a fan-exit guide vane is analyzed to identify the dominant noise producing regions on the vane. The dominant noise source regions of the vane are identified as the outer fifty percent span of the vane. The sensitivity of this result to fan tip speed and exit guide vane sweep is studied. Sweep is seen to decrease the radial correlation length of the unsteady vane response and hence decrease the noise produced by wake-vane interaction. Results for the periodic component of the fan wakes show that the magnitude of the wake harmonics is largest in the outer fifty percent span of the duct and the radial phase variation is largest in the hub region. These results demonstrate a strong cause and effect relationship between the radial distribution of the wake harmonics and the dominant noise producing regions on the fan-exit guide vane.

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Mapping Heavy Vehicle Noise Source Heights for Highway Noise

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198118788428 ◽

2018 ◽

Vol 2672 (24) ◽

pp. 134-143 ◽

Cited By ~ 1

Author(s):

Carrie Janello ◽

Paul R. Donavan

Keyword(s):

North Carolina ◽

Noise Source ◽

Operating Conditions ◽

Heavy Vehicle ◽

Secondary Source ◽

Noise Sources ◽

Vehicle Noise ◽

Heavy Trucks ◽

Heavy Truck ◽

Pavement Noise

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).

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