community noise in airplane design faa/icao have very specific requirements numerous contributors...
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Community Noise in Airplane Design
•FAA/ICAO have very specific requirements
•Numerous contributors•Jet noise•Flow Sep’n noise•Clean airframe noise
(Source: www.airliners.net)
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Noise Sources
Consider aircraft noise in the conceptual design phase
Design for low-airframe-noise transport aircraft using MDO
Quantify change in performance w.r.t. traditionally designed aircraft
Ref: AIAA 2006-0230
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10 100 1,00085
90
95
100
105
110
B747-400B757-300B767-400B777-200A300A310-304A320-214A330-322A340-212Beechjet 400Cessna Citation IIBombardier CL-600
Stage 4
Stage 3
FAA Part 36 Noise Requirements
Approach Noise
(EPNdB)
(Data from “Advisory Circular”, DOT, FAA, November 2001)
EPNdB - frequency weighted metric
TOGW - 1000lbs
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Aircraft Noise Certification
Aircraft must be certified by the FAA and ICAO in terms of noise levels
Certification noise is measured at flyover, sideline, and approach
Based on aircraft max TOGW and number of engines, the noise level is limited
Additionally, regulations limit the hours and the number of operations
2,000 m(1.24 miles)
6,500 m(4.04 miles)
Approach
Flyover
Sideline450 m
(0.28 miles)
Threshold Lift-Off
Thrust Cutback
Brake Release
120 m
(394 ft)