Aircraft Noise and Sound Aircraft Noise and Sound InsulationInsulation

Aircraft Noise and Sound Aircraft Noise and Sound InsulationInsulation

Fred PiersonFred PiersonNavy East CoastNavy East CoastAICUZ Center ofAICUZ Center of

ExcellenceExcellence

RESULTSRESULTS

• Reduced take-off Reduced take-off weightsweights

• Quiet hoursQuiet hours• Flight track changesFlight track changes• Reduction in Reduction in

operationsoperations• LitigationLitigation• Loss of flying missionLoss of flying mission

AAirir

IInstallationsnstallations

CCompatibleompatible

UUsese

ZZonesones

The AICUZ ProgramThe AICUZ Program

• Defines Defines

– Noise ZonesNoise Zones

– Accident Potential Accident Potential ZonesZones

• Recommends Land Recommends Land Use GuidelinesUse Guidelines

The AICUZ ProgramThe AICUZ Program

• AICUZ is non-bindingAICUZ is non-binding

• Land use control is the Land use control is the responsibility of local, responsibility of local, regional and state regional and state governmentsgovernments

• Building codes w/proper Building codes w/proper NLR reduces noise impactNLR reduces noise impact

What are the benefits of Sound What are the benefits of Sound Insulation?Insulation?

• Reduces

– Speech interference

– Sleep disturbance

• It’s energy efficient

– Reduces air infiltration

– Higher “R” value

Aircraft Noise and Sound Aircraft Noise and Sound InsulationInsulation

• Concerns go back to 1960’sConcerns go back to 1960’s

• 1967-Development of Sound Insulation 1967-Development of Sound Insulation methods for use around LAXmethods for use around LAX

• 1971-Noise Control Act1971-Noise Control Act

• Late 1980’s-DOD and FAA prepared Late 1980’s-DOD and FAA prepared Sound Insulation GuideSound Insulation Guide

• 1992- Publication DOT/FAA/PP 92-51992- Publication DOT/FAA/PP 92-5

• 2005- Navy sponsored 2005- Navy sponsored updateupdate

• Serves as a guide for NLR Serves as a guide for NLR in residential buildingsin residential buildings

• CoversCovers– Building materials and Building materials and

costcost– New and existing New and existing

constructionconstruction

New Sound Insulation GuidelinesNew Sound Insulation Guidelines

Mitigating Aircraft NoiseMitigating Aircraft Noise

• Aircraft noise can Aircraft noise can be disturbingbe disturbing

• Sound insulation is Sound insulation is not Sound not Sound eliminationelimination

• DNL and the Noise DNL and the Noise Exposure ZonesExposure Zones

•24-hour Average Sound Level with a weighting factor for night operations•Often used for environmental noise, especially aircraft noise in the U.S.•EPA and FAA established an interior goal of 45 DNL

•24-hour Average Sound Level with a weighting factor for night operations•Often used for environmental noise, especially aircraft noise in the U.S.•EPA and FAA established an interior goal of 45 DNL

DAY-NIGHT AVERAGE SOUND LEVELDAY-NIGHT AVERAGE SOUND LEVEL

DNLDNL

Noise Zones v. ContoursNoise Zones v. Contours

>75 dB DNL>75 dB DNL

65-69 DNL65-69 DNL

<65 DNL<65 DNL

70 DNL70 DNL

75 DNL75 DNL

70-74 dB DNL70-74 dB DNL

65 DNL65 DNL

Changes in Noise EnvironmentChanges in Noise Environment result fromresult from Changes in NOISE SYSTEMChanges in NOISE SYSTEM

SOURCESOURCE

PATHPATH

RECEIVERRECEIVER

MitigationMitigation

Sound InsulationSound Insulation• Sources of Noise PathsSources of Noise Paths

– Gaps and CracksGaps and Cracks– Windows and DoorsWindows and Doors– Walls and CeilingsWalls and Ceilings– FireplacesFireplaces– Air ConditionersAir Conditioners– Exhaust fansExhaust fans– VentilationVentilation

• All building elements must work together in a All building elements must work together in a balanced manner to reduce noise intrusionbalanced manner to reduce noise intrusion

CostsCosts

• Depends on noise zone—the higher the Depends on noise zone—the higher the noise level, the greater the costnoise level, the greater the cost

• Average cost to insulate an existing home Average cost to insulate an existing home near an airport $10K-$50K.near an airport $10K-$50K.– Most modern construction already Most modern construction already

reduces interior noise by about 20-25 reduces interior noise by about 20-25 dBdB

– New home sound insulation is lessNew home sound insulation is less

Model Building CodeModel Building Code

• Appendix D, “Noise level reduction Appendix D, “Noise level reduction Design Requirements”Design Requirements”– For NLR ofFor NLR of

• 25 dB25 dB (65-70 DNL)(65-70 DNL)• 30 dB30 dB (70-75 DNL)(70-75 DNL)• 35 dB35 dB (75-80 DNL)(75-80 DNL)

– Adaptable for:Adaptable for:• Commercial structuresCommercial structures• Civil AirportsCivil Airports

68 dB + 3 dB = 71 dB DNL

25 dB25 dB (65-70 DNL)(65-70 DNL)30 dB30 dB (70-75 DNL)(70-75 DNL)35 dB35 dB (75-80 DNL)(75-80 DNL)

Questions?Questions?