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Cars, Trucks, & Quieter Pavements. TRB ADC40 Noise & Vibration Committee Meeting July 9-12, 2006. Truck Noise Update. Work since July 2005 : Analysis of truck noise source testing using beam-forming Additional truck tire OBSI testing Implications of results.
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Cars, Trucks, & Quieter Pavements TRB ADC40 Noise & VibrationCommittee Meeting July 9-12, 2006
Truck Noise Update Work since July 2005: • Analysis of truck noise source testing using beam-forming • Additional truck tire OBSI testing • Implications of results
Truck Noise Reduced Less by Pavement Changes Possible Reasons: • Contribution of noise sources different for cars & trucks • Truck tires behave differently than passenger car tires
Indicated Source Regions on a Tractor/Trailer Composite of Approximate Source Locations
Truck Tire OBSI Tests at the NCAT Test Track • 7 Truck Tire Designs + 1 Car Tire • 8 AC Pavements • 45 mph
Truck Tire Categories Trailer Drive Axle Steering
OBSI Measurement of Truck Tires SI Probe
G167 G338 G372 G395 Aqua ZigZag XDA HT FS 560
OBSI Levels Averaged for 8 Pavements G167 G338 G372 G395 Aqua ZigZag XDA HT FS 560 98.4 105.3 102.4 98.3 97.6 97.6 97.0 97.1
G167 G372 G395 Aqua Fine Superpave Medium SMA Porous OGAC Transverse Texture
372 Calculations 167 395
Future Work • Improve Source Localization - NCHRP 8-56 • Improve Car & Truck “Model” (OBSI & Passby) • Coast vs. Cruise at Higher Speeds • Census of Traction vs. Highway Drive Tires • Develop Surrogate Test Tire