Larson Davis System 824, Training Manual

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2-2 824 Training Manual 3/22/01
- Small airport systems
- New developments around airports and land use
planning
- FAR 36 testing of airplanes (FAA operations)
- Encroachment on wilderness areas and National
Parks
- Military overflights and sonic booms
• Railroad noise
- Locomotive noise, whistles, switching opera-
tions
- Rail car retarders can produce up to 120dB peak
at 100 feet away
• Construction noise
- Can significantly change the acoustic environ-
ment
- Major projects usually require an environmental
impact study (roadways, new plants, mines, etc.)
- May require permanent noise monitoring system
• Industrial noise
- Industrial noise may come from machinery such
as fans, compressors, conveyor belts, compres-
sors, heavy equipment, gas flares, etc.
• Building noise
- Building noise includes HVAC, plumbing, appli-
ances, human activity, amplified music, TV, etc.
- Modern construction methods & materials can
worsen sound transmission and isolation problems
- Can involve many types of measurements
including room acoustics measurements (RT60,
transmission loss), environmental noise measure-
ments and vibration indoors and outdoors.