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a research excitation flight system was

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a research excitation flight system was
 

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a research excitation flight system was
recently flight tested at nasa's dryden

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recently flight tested at nasa's dryden
 

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recently flight tested at nasa's dryden
flight research facility

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flight research facility
 

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flight research facility
a nasa f-16xl aircraft served as a test

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a nasa f-16xl aircraft served as a test
 

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a nasa f-16xl aircraft served as a test
bed

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bed
 

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bed
this exciter is unique because it is a

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this exciter is unique because it is a
 

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this exciter is unique because it is a
self-contained lightweight

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self-contained lightweight
 

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self-contained lightweight
excitation system which can easily be

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excitation system which can easily be
 

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excitation system which can easily be
strapped onto a variety of aircraft

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strapped onto a variety of aircraft
 

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strapped onto a variety of aircraft
it is intended to be used in flight

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it is intended to be used in flight
 

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it is intended to be used in flight
flutter testing to help improve data

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flutter testing to help improve data
 

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flutter testing to help improve data
quality

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quality
 

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quality
and flight test efficiency

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the system consists of a fixed vein with

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the system consists of a fixed vein with
 

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the system consists of a fixed vein with
a rotating slotted cylinder at the

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a rotating slotted cylinder at the
 

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a rotating slotted cylinder at the
trailing edge

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trailing edge
 

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trailing edge
the slotted cylinder rotates and the

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the slotted cylinder rotates and the
 

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the slotted cylinder rotates and the
flow is ultimately deflected upward and

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flow is ultimately deflected upward and
 

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flow is ultimately deflected upward and
downward

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downward
 

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downward
this results in a periodic lift force

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this results in a periodic lift force
 

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this results in a periodic lift force
which is imparted to the aircraft at

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which is imparted to the aircraft at
 

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which is imparted to the aircraft at
twice the cylinder's rotational

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twice the cylinder's rotational
 

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twice the cylinder's rotational
frequency

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the exciter vane is controlled by the

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the exciter vane is controlled by the
 

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the exciter vane is controlled by the
pilot in the backseat of the f-16xl

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pilot in the backseat of the f-16xl
 

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pilot in the backseat of the f-16xl
aircraft who sets the parameters for the

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aircraft who sets the parameters for the
 

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aircraft who sets the parameters for the
test

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data is telemetered to the spectral

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data is telemetered to the spectral
 

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data is telemetered to the spectral
analysis facility where it is monitored

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analysis facility where it is monitored
 

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analysis facility where it is monitored
in real time

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in real time
 

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in real time
here response from the wing tips are

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here response from the wing tips are
 

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here response from the wing tips are
monitored to find frequency and damping

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monitored to find frequency and damping
 

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monitored to find frequency and damping
trends

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trends
 

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trends
as functions of mach number and dynamic

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as functions of mach number and dynamic
 

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as functions of mach number and dynamic
pressure

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pressure
 

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pressure
the wing can be seen responding to the

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the wing can be seen responding to the
 

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the wing can be seen responding to the
exciter veins input sweeping from 5 to

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exciter veins input sweeping from 5 to
 

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exciter veins input sweeping from 5 to
35 hertz

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35 hertz
 

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35 hertz
data is analyzed in the computer showing

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data is analyzed in the computer showing
 

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data is analyzed in the computer showing
the aircraft's natural frequencies

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test points were taken between mach 0.6

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test points were taken between mach 0.6
 

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test points were taken between mach 0.6
and mach 1.7 at an altitude of 30 000

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and mach 1.7 at an altitude of 30 000
 

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and mach 1.7 at an altitude of 30 000
feet

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feet
 

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feet
the variables in the different frequency

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the variables in the different frequency
 

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the variables in the different frequency
sweeps were linear or logarithmic sweeps

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sweeps were linear or logarithmic sweeps
 

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sweeps were linear or logarithmic sweeps
brain time length varying force

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brain time length varying force
 

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brain time length varying force
amplitude and dwelling on a certain

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frequency

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this exciter system has shown it can

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this exciter system has shown it can
 

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this exciter system has shown it can
provide high quality data and improve

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provide high quality data and improve
 

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provide high quality data and improve
flight test efficiency

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flight test efficiency
 

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flight test efficiency
with minimal interface to aircraft

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with minimal interface to aircraft
 

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with minimal interface to aircraft
systems future testing will continue to

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systems future testing will continue to
 

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systems future testing will continue to
provide insight into using this system

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provide insight into using this system
 

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provide insight into using this system
as a safer more effective flight flutter

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as a safer more effective flight flutter
 

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as a safer more effective flight flutter
testing system for today's flight

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research

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you