Liverpool rom 2010 · 2010-10-03 · Concluding Remarks ROM root locus plots indicate significant...
Transcript of Liverpool rom 2010 · 2010-10-03 · Concluding Remarks ROM root locus plots indicate significant...
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Walter A. Silva NASA Langley Research Center
Nonlinear Aeroelastic Simulation for Certification University of Liverpool 13-15 September 2010
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Introduction FUN3D Code ROM Development Process
Unsteady Aerodynamic and Aeroelastic ROMs Error Minimization Root Locus
Applications BACT, 2D, Viscous AGARD 445.6 Wing, 3D, Inviscid
Concluding Remarks
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A method for generating ROMs was recently developed based on the simultaneous excitation of modes
This method was implemented in the CFL3D structured grid flow solver
This paper presents the implementation of this method in the FUN3D unstructured grid flow solver
Additionally, wanted to develop additional capabilities: error minimization and aeroelastic root locus plots
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• Unstructured-grid flow solver • Langley-developed code • Aeroelastic capability • Multiple turbulence models
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Unsteady Aerodynamic State-Space ROM
Walsh Functions
Structural state-space ROM
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Aeroelastic Simulation ROM
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Error Minimization (Unsteady Aerodynamics)
Low Error ?
Yes
No
PULSEERA
Continue
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Currently, error minimization process applied to the development of the unsteady aerodynamic ROM only, not the aeroelastic simulation ROM.
What is meant by “Low Error”? A maximum error less than 5%.
Final accepted “Low Error” is a compromise between the lowest error possible while requiring minimal re-design effort.
How does the error in the unsteady aerodynamic ROM translate into the error in the aeroelastic simulation ROM?
Error Minimization Philosophy (Unsteady Aerodynamics)
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Aeroelastic Root Locus Plot Using Aeroelastic Simulation ROM
Modeled as a closed-loop system with gain (dynamic pressure) in MATLAB
Eigenvalues
Z-Plane Root Locus S-Plane
Root Locus
Frequency vs Damping Ratio Root Locus
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Benchmark Active Controls Technology (BACT) wing
2D, viscous (SA turbulence model)
39,000 hex cells Plunge and pitch Mach = 0.51
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Error Minimization
GAF Response Mode 1
Time, secs
Blue=FUN3D Green=ROM
0.3
0.
-0.4 1.0 2.5 0
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Error Minimization
GAF Response Mode 2
Time, secs
Blue=FUN3D Green=ROM
0.3
0.
-0.4 1.0 2.5 0
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Error Minimization
Mean Error
Maximum % Error
Generalized Coordinate
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Aeroelastic Responses, ROM and FUN3D, Q=140 psf Blue=ROM Green=FUN3D
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Aeroelastic Responses, ROM, Q=0 psf Blue=GC 1 Green=GC 2
Time
Frequency,Hz
GeneralizedCoordinate
Magnitude
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Aeroelastic Responses, ROM, Q=100 psf Blue=GC 1 Green=GC 2
Time
Frequency,Hz
Magnitude
GeneralizedCoordinate
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Aeroelastic Responses, ROM, Q=140 psf Blue=GC 1 Green=GC 2
Time
Magnitude
Frequency,Hz
GeneralizedCoordinate
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Aeroelastic Responses, ROM, Q=150 psf Blue=GC 1 Green=GC 2
Time
Magnitude
Frequency,Hz
GeneralizedCoordinate
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DampingRatio
Aeroelastic Root Locus, ROM
Frequency,HzIncreasingQ
Q = 0 psf Q = 39.6 psf Q = 79.2 psf Q = 118.8 psf Q = 158.4 psf
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Typical aeroelastic testcase
3D, inviscid 2.23M tetrahedra Four modes Mach = 0.90
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Error Minimization GAF Response Mode 1
GAF Response Mode 2
Time, secs Time, secs
1.5
0.0
-1.0 0 1.0
1.5
-1.5 0 1.0
Blue=FUN3D Green=ROM
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Error Minimization GAF Response Mode 3
GAF Response Mode 4
Time, secs Time, secs
1.5
0.0
-1.0 0 1.0
1.5
-1.5 0 1.0
Blue=FUN3D Green=ROM
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Error Minimization
Generalized Coordinate
Mean Error
Maximum % Error
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Aeroelastic Responses, ROM and FUN3D, Q=75 psf
Blue=ROM Green=FUN3D
Generalized Coordinate 1
Generalized Coordinate 2
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Aeroelastic Responses, ROM and FUN3D, Q=75 psf Blue=ROM Green=FUN3D Generalized
Coordinate 3Generalized Coordinate 4
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DampingRatio
Aeroelastic Root Locus, ROM
Frequency,Hz
Q = 0 psf Q = 20 psf Q = 40 psf Q = 60 psf Q = 80 psf
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AresI‐X,ILaunchVehicles
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Results : Ares I-XM=0.95, Baseline Modal Frequencies
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Results : Ares I-XM=0.95, Increased Modal Frequencies
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Results : Ares I-XM=0.95, Decreased Modal Frequencies
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Results : Ares I-XM=1.44, Baseline Modal Frequencies
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Results : Ares I-XM=1.44, Increased Modal Frequencies
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Results : Ares I-XM=1.44, Decreased Modal Frequencies
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Results : Ares IM=1.00, Baseline Vehicle
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Results : Ares IM=1.00, Thrust Oscillation Isolator (TOI) Vehicle
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Recent ROM developments have been successfully implemented into FUN3D unstructured flow solver
An error minimization method was developed to quantify and reduce the error associated with ROM development
A method for directly generating the aeroelastic root locus plot using the aeroelastic simulation ROM was developed and successfully demonstrated
Results were presented for the BACT, 2D, viscous case and the AGARD 445.6, 3D, inviscid case and for the Ares launch vehicle
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Concluding Remarks
Process for developing and applying unsteady aerodynamic, structural dynamic, and aeroelastic simulation ROMs presented along with error quantification procedure
Generation of FUN3D responses per Mach number for ROM generation computed in days
ROM procedure enables efficient computation of aeroelastic response due to parametric variations of structural parameters (modal frequencies); would require separate (and costly) FUN3D solutions per variation
Aeroelastic simulations at a given Mach number per dynamic pressure using FUN3D computed in days
Aeroelastic simulations at a given Mach number per dynamic pressure using ROMs computed in seconds
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Concluding Remarks
ROM root locus plots indicate significant level of reduced aeroelastic stability at M=0.5 for the Ares I-X vehicle
ROM root locus plots indicate some level of reduced aeroelastic stability at M=0.95 for the Ares I-X vehicle
ROM root locus plots indicate no reduction in aeroelastic stability at M=1.44 for the Ares I-X vehicle
ROM root locus plots indicate some reduction in aeroelastic stability at M=1.00 for the Ares I vehicle
ROM root locus plots indicate significant reduction in aeroelastic stability at M=1.00 for the Ares I vehicle with the Thrust Oscillation Isolator (TOI) variation