relating pavement macrotexture patterns to tire-pavement ... · g. final thought tpin – noise...
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Relating Pavement
Macrotexture Patterns to
Tire-Pavement Interaction
Noise Levels
Nicolas Gagarin
Starodub, Inc.
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NOISE GENERATION FACTORS
Test ProtocolNOISE
GENERATION
POWER-BY
NOISE
Passenger
Car
VEHICLE
NOISE
COAST-BY
NOISE
Passenger
Car
TIRE-
PAVEMENT
INTERACTION
NOISE
AERODYNAMIC
NOISE
Standard Tire
& Constant
Speed
TREAD
PATTERN AIR
PUMPING
NOISE
TREAD
PATTERN
NOISE
OTHER TiRE
NOISE
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A scientifically founded and experimentally calibrated acoustic computation methodology:
� Modeling of five standard vehicle types, including automobiles, medium trucks, heavy trucks, buses, and motorcycles, as well as user-defined vehicles.
� Modeling of both constant-flow and interrupted-flow traffic using a 1994/1995 field-measured database.
� Modeling of the effects of different pavement types, as well as the effects of graded roadways.
� Sound level computations based on a one-third octave-band database and algorithms.
� Graphically interactive noise barrier design and optimization.
� Attenuation over/through rows of buildings and dense vegetation.
� Multiple diffraction analysis.
� Parallel barrier analysis.
� Contour analysis, including sound level contours, barrier insertion loss contours, and sound-level difference contours.
FHWA Traffic Noise Model
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� TPIN has many components
described qualitatively in the
little book of quieter
pavements.
� Previous research consider
pavement- and tire- textures
characteristics.
� Noise generation has many
components: tread impact, air
pumping, acoustical horn,
stick slip, tire-structural
vibrations and resonances.
Tire-Pavement Interaction Noise
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Tire-Pavement
Noise Interaction
POROSITY
STRUCTURAL
CHARACTERISTICS
(STIFFNESS)
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Tire-Pavement Interaction Noise
EFFECT OF PAVEMENT SURFACE
100
105
110
115
120
125
60 70 80 90 100 110 120
SPEED, (kph)
PO
WE
R L
EV
EL
(d
B)
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� Relate pavement surface macrotexture characteristics to
tire-pavement interaction noise
� Use non-linear non-stationary signal decomposition to
characterize pavement surface macrotexture (1-D and 2-D)
and tire-pavement interaction noise
� Using synchronized measurements, perform correlation
analysis for local variations
� Define adaptive non-linear non-stationary procedure as an
alternative to third octave analysis used in OBSI method
A. Objectives
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� Non-linear frequency modulations are lost in the third-
octave analysis approach
� Transient variations in the spatial domain are lost in the
third octave analysis approach
� Scalar differences between macrotexture and tire-
pavement interaction noise (TPIN) are lost in the linear
parameters mean-profile depth and third-octave sound
intensity
� The frequency and power modulations of macrotexture and
TPIN are directly related
� Continuous sound intensity can be estimated using
continuous macrotexture
B. Hypothesis
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C. Synchronization:
CALTRANS Project 1998
OBSI
ROSAN
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D. Signal Processing
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Linear/Stationary Non-Linear/Stationary Non-Linear/ Non-Stationary
Fourier Wavelet EMD
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E. Current status � Literature Search Completed
� Data Reduction Approach Defined
� Performed Preliminary Field Experiment in Fall
of 2009
� Defined Data Needs
� Identified Potential Sub-Contractors for Limited
Data Collection with Control Protocol
� Requested/Received Cost Estimates –
Evaluation Currently in-progress
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F. Data
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SRTT Tire Print
Rear Vehicle with OBSI and ROSAN systems. Front
OBSI System
3 1
4 2
ROSAN
DMI DATA
At one speed ONLY: 60 mph
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At 12 mph
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OBSI –SRTT
MICROPHONE DATA
ROSAN
LASER DATA
Microphone 1
Microphone 2
Microphone 3
Microphone 4
60 mph
SRTT Tire Print
LASER
•Wavelength-Distance Maps
•Intrinsic Mode Functions
MICROPHONE
•Wavelength-Distance Maps
•Intrinsic Mode Functions
TIRE-PRINT
•Wavelength-Distance Maps
•Intrinsic Mode Functions
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ROLINE LASER
•Wavelength-Distance Maps
•Intrinsic Mode Functions
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LASER
•Wavelength-Distance Maps
•Intrinsic Mode Functions
MICROPHONE
•Wavelength-Distance Maps
•Intrinsic Mode Functions
TIRE-PRINT
•Wavelength-Distance Maps
•Intrinsic Mode Functions
ROLINE LASER
•Wavelength-Distance Maps
•Intrinsic Mode Functions
DATA ANALYSIS
•Cross-Correlation of Intrinsic Mode Functions
•Cross-Spectrum of Wavelength-Distance Maps
TEXTURE – NOISE MODEL
Based on Wavelength Patterns
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G. Final Thought � TPIN – Noise Components are complex non-
linear, non-stationary waves
� 1-D and 2-D SURFACE Macrotexture are the
primary geometric aspect. Microtexture,
Megatexture, Porosity, and Structural Response
are secondary.
� Proposed model looks at ACCURATE LOCAL
patterns in both pavement surface macrotexture
and Noise records at the sensor level, not the
PROCESSED PARAMETER level, Sound
intensity and mean texture depth.