Community Noise in Airplane Design

1
Community Noise in Airplane Design

• FAA/ICAO have very specific requirements
• Numerous contributors
• Jet noise
• Flow Sepn noise
• Clean airframe noise

(Source www.airliners.net)
2
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
3
FAA Part 36 Noise Requirements
Approach Noise (EPNdB)
(Data from Advisory Circular, DOT, FAA,
November 2001)
TOGW - 1000lbs
EPNdB - frequency weighted metric
4
Aircraft Noise Certification
Thrust Cutback
Lift-Off
Threshold
120 m (394 ft)
Flyover
450 m (0.28 miles)
Approach
Sideline
Brake Release
2,000 m (1.24 miles)
6,500 m (4.04 miles)

• 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