rbf update of cae models on actual manufactured shapes
TRANSCRIPT
RBF update of CAE models on actual manufactured shapesProf. Marco Evangelos Biancolini – University of Rome “Tor Vergata”
Outline
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Robust design concepts
Update of CAE model of manufactured part
Standard methods RBF methods RIBES wing example
Robust design concepts
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The actual manufactured shapes represent the nominal geometry within a prescribed tolerance
The effect on performances can be predicted in advance (mesh morphing and RS method are typically adopted)
The effect on performances can be evaluated after manufacturing (an update of CAE models is required!)
The same concepts can be applied to parts that passed QA (i.e. deviations within prescribed tolerances) as well to off-design parts (for instance repaired ones)
CAE update workflow Main advantages
No need to generate a new CAD No need to generate a new mesh Cloud of acquired points can be
directly filtered using RBF An STL can be used as input Fast process that keeps the same
mesh Main disadvantages
RBF filtering technique has to be mastered
Computational intensive
Main advantages Accurate geometry quality
control Updated CAD available
Main disadvantages Highly skilled CAD user required CAD reconstruction is a long and
complex process Remesh required Comparison with baseline CAE
mesh requires interpolationFeb 2017
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RBF Morph
RBF based CAD based
CAE based
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Acquired geometry available as: a cloud of points (usually automatic
triangulation and filtering available) regular points scanned on 3d-curves (curve
fitting) New surfs can be built as:
automatic multipatch parametric surfaces
Once the new CAD is built the CAE model has to be regenerated (new mesh and set-up)
RBF based
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Acquired geometry available as: a cloud of points (usually automatic triangulation
and filtering available) regular points scanned on 3d-curves (curve fitting)
Direct surface mesh update: Experimental points are projected onto the original
CAD A field moving points from original to acquired
position results The field is filtered using RBF regression (rbf4noisy)
RBF based
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CAD acquired surf update: Direct projection on CAD entities in RBF Morph
ACT for Workbench STL projection on meshes in RBF Morph SA/Fluent
Add On FEA mesh update:
Updated surfaces are controlled RBF set-up for mesh morphing completed using
RBF Morph A quick comparison between original and actual
geo can be conducted on the same FEA model
RIBES EU Project Radial basis functions at fluid Interface Boundaries to Envelope
flow results for advanced Structural analysis JTI-CS-2013-GRA-01-052
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RBF Morph
RIBES test article
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WT test article built as an aeronautical wing box. Manufacturing fidelity is tricky, especially at the leading edge because of the thickness of the skin.
RIBES test article
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The shape of the manufactured part has been recorded using a contact profilometer at 8 cross sections of the airfoil, some noise is observed in the experimental data.
RIBES test article
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A new CAD has been manually defined by fitting the 8 curves (filtering out the noise) and connecting them in the span direction.
RIBES test article
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The update of the volume mesh can be achieved using the new CAD.
RBF Morph (ACT Extension for WB) interact with the BREP (multiple surfaces, virtual topology can be considered)
Projection works with a single face projection
RIBES test article
Feb 2017RBF Morph
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The update of the volume mesh can be achieved using the new CAD.
RBF Morph (ACT Extension for WB) interact with the BREP (multiple surfaces, virtual topology can be considered)
Projection works with a single face projection
RIBES test article
Feb 2017RBF Morph
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The update of the volume mesh can be achieved using the new CAD.
RBF Morph (Stand Alone and Fluent Add On ) comes with a projection tool based on the implicit surface
The airfoil has been split in 3 surfaces (double wall issues at trailing edge)
RIBES test article
Feb 2017RBF Morph
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The update of the volume mesh can be achieved using the new CAD.
RBF Morph (Stand Alone and Fluent Add On ) comes with a projection tool based on the implicit surface
The airfoil has been split in 3 surfaces (double wall issues at trailing edge)
RIBES test article
Feb 2017RBF Morph
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The update of the volume mesh can be achieved using the new CAD.
RBF Morph (Stand Alone and Fluent Add On ) comes with a projection tool based on the implicit surface
The airfoil has been split in 3 surfaces (double wall issues at trailing edge)
RIBES test article
Feb 2017RBF Morph
17
The update of the volume mesh can be achieved using the new CAD.
RBF Morph (Stand Alone and Fluent Add On ) comes with a projection tool based on the implicit surface
The airfoil has been split in 3 surfaces (double wall issues at trailing edge)
RIBES test article
Feb 2017RBF Morph
18
The update of the volume mesh can be achieved using the new CAD.
RBF Morph (Stand Alone and Fluent Add On ) comes with a projection tool based on the implicit surface
The airfoil has been split in 3 surfaces (double wall issues at trailing edge)
RIBES test article
Feb 2017RBF Morph
19
The update of the volume mesh can be achieved using the new CAD.
RBF Morph (Stand Alone and Fluent Add On ) comes with a projection tool based on the implicit surface
The airfoil has been split in 3 surfaces (double wall issues at trailing edge)
RIBES test article
Feb 2017RBF Morph
20
A direct method which consists in RBF filtering the acquired points (rbf4noisy) can be used
Experimental points are projected onto the baseline CAD to create a field
The field is filtered according to the retained spatial wavelength
RIBES test article
Feb 2017RBF Morph
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A direct method which consists in RBF filtering the acquired points (rbf4noisy) can be used
Experimental points are projected onto the baseline CAD to create a field
The field is filtered according to the retained spatial wavelength
RIBES test article
Feb 2017RBF Morph
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A direct method which consists in RBF filtering the acquired points (rbf4noisy) can be used
Experimental points are projected onto the baseline CAD to create a field
The field is filtered according to the retained spatial wavelength
Geometries comparison
RBF Morph
CAD
CAD RBF Morph
CL 0.3132 0.3135CD 145.9 dc 144.8 dc
Aerodynamic solutionsCAD
RBF Morph
Pressure
Related topics
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RBF4ARTIST a system that allows to use an haptic device to directly insert individual control points https://youtu.be/74yjd7ZWcNk
RBF4METRO a system for compensation of metrological data (correction field defined using CAE)
Robust design using mesh morphing to define a shape parametric CAE model
Local update of a large dead mesh using local CAD (original and target) and RBF
Conclusions
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RBF technology can simplify and shorten the update of the CAE model onto the actual measured shape
Powerful RBF noise filtering tools available Final Update of the CAE model using mesh morphing To learn more about RBF technology of RBF Morph
consider a visit of our web site www.rbf-morph.com.
Many thanks for your kind attention!
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