institute of flight systems
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Institute of Flight Systems. Recent Activities 102 ACGSC Committee Meeting 17 October 2008, Niagara Falls, New York Oliver Brieger, German Aerospace Center (DLR) [email protected]. DLR is Germany’s aerospace research center and space agency. - PowerPoint PPT PresentationTRANSCRIPT
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Recent Activities
102 ACGSC Committee Meeting
17 October 2008, Niagara Falls, New York
Oliver Brieger, German Aerospace Center (DLR)
Institute of Flight SystemsInstitute of Flight Systems
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ACGSC Meeting, October 17, 2008, Slide 2
Member of Hermann von Helmholtz-Association of National Research Centers (HGF)
DLR is Germany’s aerospace research center and space agency
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ACGSC Meeting, October 17, 2008, Slide 3
DLR
performs basic research
develops novel technologies
builds and operates large-scale test facilities
assumes management tasks
trains junior scientists
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ACGSC Meeting, October 17, 2008, Slide 4
Sites
31 research institutes and
scientific/technical
facilities at
8 sites
4 branches
German-Dutch
Wind Tunnels (DNW)
European Transonic
Wind Tunnel (ETW)
German Armed Forces
Flight Test Center
ManchingManching
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ACGSC Meeting, October 17, 2008, Slide 5
Institute of Flight Systems
Flight Mechanics & Flight Dynamics,
SysID and Modelling
Flight Sciences
Dynamic Interaction between Human
Operator and Machine
Cognectics
Control Technology and Application,
Advanced Autonomy
Guidance & Control
System Integration of S.-Critical Systems,
Systems Engineering
Systems & Flight Safety
Technology Validation by Experiment
DLRReportDLR
Report
Theory Ground Experiment Flight Test & Research
DLRReportDLR
Report
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ACGSC Meeting, October 17, 2008, Slide 6
Flying Testbeds
Full access to experimental systems and equipment -> in house design
EC 135 - FHS VFW 614 ATTAS ARTIS-Family (Micro,Midi, Maxi)
Bo-105
USTOL /MIL Demo ?
(in acquisition)A 320 Advanced Technology Research Aircraft - ATRA
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ACGSC Meeting, October 17, 2008, Slide 7
Aircraft Wake Vortex & Atmospheric Turbulences: Modelling, Interaction and Control
1. Theory2. Messurement3. Modelling4. Solutions5. Verification6. Application
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ACGSC Meeting, October 17, 2008, Slide 8
A400M Low Level Flight Functions with ATTAS
Inflight Simuation and Demonstration of Advanced Low Level Flight Functions forLarge Transport Aircraft
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ACGSC Meeting, October 17, 2008, Slide 9
Active Control Technology – Improved Mission Effectiveness (ACT-IME) with EC 135 FHS
• Successful Demonstration of new EC-F functions• New active Sidestick concept
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ACGSC Meeting, October 17, 2008, Slide 10
WASLA-HALE – Remote Mission Steering and Integration of UAV into Air Traffic Management
COM 1
COM 3
Command Data Linkwith Intercom
COM 2
Relais A/C
AFCS /ATHRFMSMMS-BordRAPIN+
GCS BraunschweigGCS Manching
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ACGSC Meeting, October 17, 2008, Slide 11
Rotorcraft - New Technologies
Active Twist Blade on Test Rig
Innovative New Rotor
but: „Circle-shaped Rotor-Wing“limits economy of fast flight
• Only 25% of noise• Only 10% of vibration level,
reducing scheduled maintenance cost > 50%
• Marginal Improvement of Efficiency
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ACGSC Meeting, October 17, 2008, Slide 12
Flight Test Group ManchingInvolved in all aspects of military flight testing
(mainly HQ, CFH and performance)
For Eurofighter/ Typhoon
soon for A400Mup
dwn
STP (t)STP (t)
XK()XK()
SXX()SXX()
EXX()EXX()
up
dwn
STP (t)STP (t)
XK()XK()
SXX()SXX()
EXX()EXX()
up
dwn
STP (t)STP (t)
XK()XK()
SXX()SXX()
EXX()EXX()
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ACGSC Meeting, October 17, 2008, Slide 13
Based on GRATE and ATLAS systems developed in the late 80s to evaluate handling qualities during air-to-surface tracking
Array of lighted targets are placed at predefined positions on the ground
During a prolonged gun attack, target lights are illuminated in a predefined sequence
Pilot has to acquire and track the respective target expeditiously and precisely, being forced to react continuously using a high gain piloting technique
Employed to assess and optimize tracking filter with respect to gross acquisition and fine tracking
Eurofighter Air-to-Surface HQ Evaluation for Swing-Role Adaptation (Ground Attack Test Equipment II - GRATE II)
Target AreaAircraft
xy
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ACGSC Meeting, October 17, 2008, Slide 14
Flight Test Parameters and Simulated Attack Geometry
2,4 NM(14339 ft)
~1,4 NM(8506 ft)
1500 ft
10°
4030 ft
22 secs (=16016 ft) mit 431 KTAS (=400 KDAS)
Versuch: 20 secs (=14560 ft) mit 4
31 KTAS2 secs
2,6 NM(15772 ft)
4281 ft
300-500ft
~ 4800 ft
2,4 NM(14339 ft)
~1,4 NM(8506 ft)
1500 ft
10°
4030 ft
22 secs (=16016 ft) mit 431 KTAS (=400 KDAS)
Versuch: 20 secs (=14560 ft) mit 4
31 KTAS2 secs
2,6 NM(15772 ft)
4281 ft
300-500ft
~ 4800 ft
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ACGSC Meeting, October 17, 2008, Slide 15
Employment of GRATE II for Pilot Model IdentificationOptimization of Target Array Geometry
Requirement: nearly uniform and small angle variations (0.4 - 1 deg) due to small perturbations approach
Ap
ert
ure
An
gle
[d
eg
]x1
x2
y1 y2
x3=y3
x4
y5
x5
x
133 m
123 m
112 m
y4
1 deg limit
0.4 deg limit
Distance x to reference target
4 x 21.5 m
102 m
yLast angle alteration
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ACGSC Meeting, October 17, 2008, Slide 16
Input Signal into the Pilot-Aircraft SystemDefined by:
The varying line of sight between the aircraft and the individual targets
Target illumination sequence
x1 x2 x3 x4 x5
x
1+2
3+4
Distance x to the reference target [m]
Ap
ert
ure
an
gle
pro
gre
ssio
n [
de
g]
2
3
A
mp
litu
de
[d
eg
]
-5000 -4000 -3000 -2000 -1000
r(t)
vx1
vx5
vx3
vx4 vx4
vx3
3
2
1
0
-1
-2
-3
Distance x to the reference target [m]
Multi-step Approximation
34
2134
2 1
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ACGSC Meeting, October 17, 2008, Slide 17
Frequency [rad/s]
CP 0.5
C 0.5
P 0.5
0 /2 3/2 2
Amplitude [deg]
Sequence Selection
Maximized power spectra over a wide frequency range → Fourier Analysis
P
N
kkkj
N
j
N
jj
C
vvtiN
vNt
tt
T
R
1
1
1
11
22
2
)cos(21
)(
)cos(12
|)(|
0 /2 3/2 2
maximum of C
Frequency [rad/s]
Am
plit
ud
e S
pe
ctru
m
t = 2.25s – 3s
t [s] [rad/s]
2)(
)cos(12
t
tt
zero location
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ACGSC Meeting, October 17, 2008, Slide 18
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ACGSC Meeting, October 17, 2008, Slide 19
Pilot Model IdentificationResults