manshu
DESCRIPTION
noise control on highways,various techniques of noise control on road, modern highway engineeringTRANSCRIPT
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GOVT.COLLEGE OF ENGINEERING,KARAD
Name :Mr.Himanshu Satoskar Roll No : 09154
A Seminar on
NOISE CONTROL ON HIGHWAYS
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CONTENTS
IntroductionAim and its objectiveSound and NoiseNoise barrierTyre and Pavement NoiseTypes of pavementsConclusionReferences
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SOUND AND NOISESound is small but fast changes
in air pressure that cycle higher and then lower than the air pressure that is all around us.
Noise is a sound that is objectionable to individual.
Decibel
Sound-level[Db]=20*log10([Pa]/0.0002Pa)
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Figure 1. Comparison of sound pressure, sound levels, and common examples
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TRAFFIC NOISEPropulsion noise At low speedTyre-Pavement noise Cross-over speedAerodynamic noise High speed
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EFFECT OF VEHICLE TYPE AND SPEED
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CONTROL OF TRAFFIC NOISE
Six possible methods to reduce traffic noise
Noise barriersReducing source noise intensityEncouraging use of hybrid &
electric highwaysImproving aerodynamics & tyre-
designLow noise paving material
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NOISE BARRIERA noise barrier is an interior
structure designed to protect sensitive land uses from noise pollution.
Most effective method• Reduce loudness of noise by half• Reduce noise level for people
living next to highways• Do not increase noise levels on
opposite highways
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NOISE BARRIERHistory DesignWorkingMaterial
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Types of noise barriers
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Grooved noise barrierDeveloped by Carsonite
International Light-weight hollow panels made
of tongue and groove planks of reinforced composite materials filled with crumbed tyre rubber
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Disadvantages and limitationsAesthetic impacts for motorists &
neighbours, if scenic views are blocked
Cost of design, construction and maintenance
Necessity to design custom drainage that the barrier may interrupt
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TYRE-PAVEMENT NOISE
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Reasons behind tyre –pavement noise• Tread impact• Air pumping• Stick-slip• Stick-snap
Amplification of sound• Acoustical horn• Helmholtz resonance• Pipe resonance• Cavity resonance
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Pavement PropertiesTexturePorosityStiffness
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ASPHALT ALTERNATIVESPorous asphaltGap-graded stone-matrixDense-graded asphalt mixtureAsphalt rubber friction course
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ASPHALT RUBBER FRICTION COURSEBenefits: Safety Significant reduction of traffic noise in urban area Improved surface water drainage, reducing safety hazards of
hydroplaning and visual impairing water spray Potentially major cost savings through elimination of sound
barriers Reduction of maintenance costs through improved crack
resistance Conserves natural resources (friction course can be reduced
in thickness, conserving aggregate and asphalt cement) Can save initial capital construction costs through cost-
effective alternative to road construction Improved road structural stability by preventing moisture
penetration into road foundation Elimination of waste tyres through productive recycling
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a)Porous Asphaltb)Gap-graded stone matrixc)Dense-graded asphalt mixture
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CONCRETE ALTERNATIVESDrag and Diamond ground
concreteLongitudnal TiningTransverse TiningExposed aggregatePorous concrete
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a)Drag & Diamond ground concreteb)Longitudnal Tining & Transverse Tiningc)Exposed aggregate & Porous concrete
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CONCLUSIONThough this technique of noise control is
not yet developed in India, it is going to be one of the important aspects of highway engineering in near future, as the cities are expanding the boundaries of the cities are now very close to highways. In recent years conscious efforts have been made to reduce the highway noise. The techniques of quieter asphalt and concrete pavements should be implemented. The noise control will help us to achieve the goal of safe, quiet, durable highways.
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REFERENCESUlf Sandberg and Jerzy Ejsmon, Tyre/Road Noise Reference book(2005)Traffic Noise Model Technical Manual(FHWA-PD-96-010)Robert Bernhard,An Introduction to Tire/Pavement Noise(SQDH 2005-1)William M. Hartmann,Signal,Sound and SensationLeo Beranek and Istvan Ver, Noise and Vibration Control Engineering
Web-sections•www.fhwa.dot.gov/environment/noise•www.fhwa.dot.gov/pavement•www.quietroads.com•www.dot.ca.gov/hq/env/noise•www.ncat.us•www.cptechcenter.org
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Special Thanks to-
•Prof.Dr.S.K.Hirde•Prof.Dr.Y.M.Ghugal