Copyright LOCKHEED MARTIN CORPORATION 2009

Fixing Sonic BoomFixing Sonic Boom

John MorgensternJohn Morgenstern

1 March 2009 1 March 2009

2Copyright LOCKHEED MARTIN CORPORATION 2009

Sonic Boom 101 (Concorde)Sonic Boom 101 (Concorde)

3Copyright LOCKHEED MARTIN CORPORATION 2009

Why are N-Wave Booms so Bad?Why are N-Wave Booms so Bad?O

VE

RP

RE

SS

UR

E, l

b/s

q f

t (p

sf)

OV

ER

PR

ES

SU

RE

, lb

/sq

ft

(ps

f)

TIME, millisecondsTIME, milliseconds

Rapid Pressure ChangesRapid Pressure Changesin hearing range 30-300 Hzin hearing range 30-300 Hz

Slow Pressure ChangeSlow Pressure Changebelow hearing range 3-8 Hzbelow hearing range 3-8 Hzfundamentalfundamental

BOOM!BOOM!

BOOM!BOOM!

4Copyright LOCKHEED MARTIN CORPORATION 2009

What’s a Low Boom?What’s a Low Boom?O

VE

RP

RE

SS

UR

E, l

b/s

q f

t (p

sf)

OV

ER

PR

ES

SU

RE

, lb

/sq

ft

(ps

f)

TIME, millisecondsTIME, milliseconds

5Copyright LOCKHEED MARTIN CORPORATION 2009

Why can Low Boom be Acceptable?Why can Low Boom be Acceptable?O

VE

RP

RE

SS

UR

E, l

b/s

q f

t (p

sf)

OV

ER

PR

ES

SU

RE

, lb

/sq

ft

(ps

f)

TIME, millisecondsTIME, milliseconds

25-35dB Reductions25-35dB Reductionsin hearing range 30-300 Hzin hearing range 30-300 Hz

Slow Pressure ChangeSlow Pressure Changebelow hearing range 3-8 Hzbelow hearing range 3-8 Hzfundamentalfundamental

pump

pump

6Copyright LOCKHEED MARTIN CORPORATION 2009

Environmentally Compatible Environmentally Compatible Quiet Supersonic TransportationQuiet Supersonic Transportation

NASA N+3 Supersonics, Three Generations Forward in Aviation

Technology http://www.saiqsst.com

QUIET SUPERSONIC TRANSPORTATION:QUIET SUPERSONIC TRANSPORTATION:- Sonic Booms reduced to Sonic PuffsSonic Booms reduced to Sonic Puffs- Airport Noise and Emissions comply with subsonic rulesAirport Noise and Emissions comply with subsonic rules- Breakthroughs in Supersonic Laminar Flow (reduced Breakthroughs in Supersonic Laminar Flow (reduced friction drag) and Computer Design Capabilityfriction drag) and Computer Design Capability

QUIET SUPERSONIC TRANSPORTATION:QUIET SUPERSONIC TRANSPORTATION:- Sonic Booms reduced to Sonic PuffsSonic Booms reduced to Sonic Puffs- Airport Noise and Emissions comply with subsonic rulesAirport Noise and Emissions comply with subsonic rules- Breakthroughs in Supersonic Laminar Flow (reduced Breakthroughs in Supersonic Laminar Flow (reduced friction drag) and Computer Design Capabilityfriction drag) and Computer Design Capability