Tire Noise

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Cars, Trucks, Quieter Pavements
TRB ADC40 Noise Vibration Committee
Meeting July 9-12, 2006
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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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Truck Noise Reduced Less by Pavement Changes
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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

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Beam Forming Applied to Trucks
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(No Transcript)
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50 mph Coastby 1165 Hz
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Indicated Source Regions on a Tractor/Trailer
Composite of Approximate Source Locations
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Truck Tire OBSI Tests at the NCAT Test Track

• 7 Truck Tire Designs 1 Car Tire
• 8 AC Pavements
• 45 mph

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Truck Tire Categories
Trailer
Drive Axle
Steering
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OBSI Measurement of Truck Tires
SI Probe
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OBSI Measurements for Truck Tires
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(No Transcript)
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OBSI Levels Averaged for 8 Pavements
98.4
105.3
102.4
98.3
97.6
97.6
97.0
97.1
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Single Drive Axle Truck Passbys
50 mph
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Dual Drive Axle Truck Passbys
50 mph
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Truck Tire Differences
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Dual Drive Axle Tractor/Trailer Passbys
50 mph
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Fine Superpave
Medium SMA
Porous OGAC
Transverse Texture
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Transverse Texture Superpave
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On Fine Aggregate Superpave
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On Medium Aggregate SMA
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On Transverse Texture Superpave
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On Coarse, Porous OGAC
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167 Traction Tire on Different Pavements
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Calculations
395
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Cars, Trucks, Quieter Pavement
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Cars, Trucks, Quieter Pavement
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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

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Bye, Bye