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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 Presentation
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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
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
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
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
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
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
ACGSC Meeting, October 17, 2008, Slide 7
Aircraft Wake Vortex & Atmospheric Turbulences: Modelling, Interaction and Control
1. Theory2. Messurement3. Modelling4. Solutions5. Verification6. Application
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
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
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
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
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()
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
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
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
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
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
ACGSC Meeting, October 17, 2008, Slide 18
ACGSC Meeting, October 17, 2008, Slide 19
Pilot Model IdentificationResults