LMS Virtual.Lab Correlation - LMS International
LMS Virtual.Lab Correlation - LMS International LMS Virtual.Lab Correlation - LMS International
LMS Virtual.Lab Correlation Validate Simulation Models LMS Conference – March 23, 2006 Koen De Langhe – Product Line Manager Noise and Vibration
- Page 2 and 3: Outline 1 Industry challenges 2 Val
- Page 4 and 5: Outline 1 Industry challenges 2 Val
- Page 6 and 7: Value Proposition Correlate FE Mode
- Page 8 and 9: Value Proposition Pre-Test Finite E
- Page 10 and 11: Outline 1 Industry challenges 2 Val
- Page 12 and 13: Correlating the Simulation Model Ge
- Page 14 and 15: Correlating the Simulation Model Mo
- Page 16 and 17: Correlating the Simulation Model Fr
- Page 18 and 19: Agenda ! The Objective ! Correlatin
- Page 20 and 21: Sensitivity and Updating Correlatio
- Page 22 and 23: Sensitivity and Updating Alternativ
- Page 24 and 25: MAC Updating Test MAC = 0.7 MAC = 0
- Page 26 and 27: Sensitivity and Updating ! Sensitiv
- Page 28 and 29: Improving the Measurements LMS Virt
- Page 30: Summary 1 Industry challenges 2 Val
<strong>LMS</strong> <strong>Virtual</strong>.<strong>Lab</strong> <strong>Correlation</strong><br />
Validate Simulation Models<br />
<strong>LMS</strong> Conference – March 23, 2006<br />
Koen De Langhe – Product Line Manager Noise and Vibration
Outline<br />
1 Industry challenges<br />
2 Value Proposition<br />
3 Solution Highlights<br />
3.1 <strong>Correlation</strong><br />
3.2 Model Updating<br />
3.3 Pre-Test Analysis<br />
2 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Industry Challenges<br />
! Build accurate simulation models<br />
! Cause of uncertainties:<br />
! Physical Uncertainty:<br />
• Material ?<br />
• Geometry ?<br />
• Boundary conditions ?<br />
! Simulation Uncertainty:<br />
• The right discretization ?<br />
• Numerical solution ?<br />
3 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Outline<br />
1 Industry challenges<br />
2 Value Proposition<br />
3 Solution Highlights<br />
3.1 <strong>Correlation</strong><br />
3.2 Model Updating<br />
3.3 Pre-Test Analysis<br />
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Value Proposition<br />
Correlate FE<br />
Models<br />
Update FE<br />
Models<br />
Improve<br />
Measurements<br />
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Value Proposition<br />
Correlate FE<br />
Models<br />
Update FE<br />
Models<br />
Improve<br />
Measurements<br />
! Improve FE model so it better matches<br />
reference model<br />
! To use the information available:<br />
! Modal data<br />
! FRF data<br />
! …<br />
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Value Proposition<br />
Correlate FE<br />
Models<br />
Update FE<br />
Models<br />
Improve<br />
Measurements<br />
! The engineering challenge:<br />
! Get as-much-as possible<br />
information from as-less-as possible<br />
measurements on ever-more<br />
complex systems<br />
! Technical challenge:<br />
! To create the optimal Test set-up:<br />
• Excitation locations<br />
• Measurement locations<br />
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Value Proposition<br />
Pre-Test<br />
Finite<br />
Element<br />
Test<br />
<strong>Correlation</strong><br />
Sensitivity<br />
Updating<br />
8 copyright <strong>LMS</strong> <strong>International</strong> - 2005
The Objective:<br />
Covering the Global Process<br />
Pre-Test<br />
Finite<br />
Element<br />
Test<br />
<strong>Correlation</strong><br />
Sensitivity<br />
Updating<br />
9 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Outline<br />
1 Industry challenges<br />
2 Value Proposition<br />
3 Solution Highlights<br />
3.1 <strong>Correlation</strong><br />
3.2 Model Updating<br />
3.3 Pre-Test Analysis<br />
10 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Enabling Techniques<br />
! First shot comparison<br />
! Visual comparison of the models<br />
! Compare masses<br />
! Compare eigenfrequencies<br />
! Visual compare mode shapes<br />
! Visual comparing FRFs<br />
?<br />
! Benefits:<br />
! Fast and easy first assessment<br />
! Restriction:<br />
! No quantitative measure of similarity<br />
! No insight where discrepances occur<br />
?<br />
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Correlating the Simulation Model<br />
Geometric <strong>Correlation</strong><br />
! Geometric <strong>Correlation</strong><br />
! Test and FE are misaligned<br />
! Features<br />
! Scale, Translate, Rotate<br />
• Automatic<br />
• Interactive<br />
! Benefits:<br />
! Efficient<br />
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Correlating the Simulation Model<br />
Modal-based <strong>Correlation</strong><br />
! Modal Assurance Criterion (MAC)<br />
! Global indicator: comparing<br />
shapes<br />
! Benefits:<br />
! Quantitative means of comparing<br />
primary dynamics (Modes)<br />
! Can be extended to static shape,<br />
running mode shape,..<br />
! FE-Test; FE-FE; Test-Test<br />
13 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Correlating the Simulation Model<br />
Modal Assurance Criterion (MAC)<br />
Side-by-Side Animation<br />
Mode Pair Table<br />
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Correlating the Simulation Model<br />
MAC Contribution<br />
! Error Localization:<br />
! Identifies areas of bad correlation<br />
Visual<br />
representation<br />
of contribution<br />
Contribution<br />
of DOF to<br />
MAC<br />
15 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Correlating the Simulation Model<br />
Frequency-based <strong>Correlation</strong><br />
! Frequency Response Assurance Criterion<br />
(FRAC)<br />
! DOF <strong>Correlation</strong>: based on Transfer<br />
Functions<br />
! Benefits:<br />
! Error localization: Gives insight into<br />
the global stiffness discrepancies<br />
! Damping values are taken into account<br />
• Complements MAC<br />
! When modes are not available<br />
! FE-Test; FE-FE; Test-Test<br />
16 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Correlating the Simulation Model<br />
Orthogonality Check<br />
! Orthogonality of modes wrt system<br />
matrix<br />
! Pseudo orthogonality check (POC):<br />
! Between analytical and experimental<br />
modes<br />
! Using AnaIytical mass matrix<br />
! Features:<br />
! Driving NASTRAN DMIG Case<br />
! Benefits:<br />
! Better quantification of correlation<br />
! Very efficiently<br />
17 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Agenda<br />
! The Objective<br />
! Correlating the Simulation Model<br />
! Updating the Simulation Model<br />
! Improving the Measurements<br />
! Summary<br />
18 copyright <strong>LMS</strong> <strong>International</strong> - 2005
The Objective:<br />
Covering the Global Process<br />
Pre-Test<br />
Finite<br />
Element<br />
Test<br />
<strong>Correlation</strong><br />
Sensitivity<br />
Updating<br />
19 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Sensitivity and Updating<br />
<strong>Correlation</strong><br />
1<br />
2<br />
Indirect<br />
Sensitivities<br />
Direct<br />
Sensitivities<br />
NEW<br />
Rev 6<br />
Updating<br />
Updating<br />
NASTRAN<br />
ANSYS<br />
CATIA CAE<br />
PERMAS<br />
<strong>Virtual</strong>.<strong>Lab</strong><br />
Optimization /<br />
OPTIMUS<br />
NASTRAN<br />
SOL200<br />
<strong>Virtual</strong>.<strong>Lab</strong><br />
Optimization<br />
20 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Sensitivity and Updating<br />
Alternative 1: Finite Difference<br />
1<br />
Input<br />
parameters<br />
Targets<br />
<strong>Virtual</strong>.<strong>Lab</strong><br />
Optimization<br />
<strong>Virtual</strong>.<strong>Lab</strong><br />
Mesh Based<br />
Design<br />
<strong>Virtual</strong>.<strong>Lab</strong><br />
FE Driver<br />
<strong>Virtual</strong>.<strong>Lab</strong><br />
<strong>Correlation</strong><br />
Mode Freq<br />
/ MAC /….<br />
FE Input<br />
File<br />
NASTRAN<br />
ANSYS<br />
CATIA CAE<br />
FE Results<br />
File<br />
21 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Sensitivity and Updating<br />
Alternative 2: NASTRAN SOL200<br />
2<br />
Design<br />
parameters<br />
Targets<br />
<strong>Virtual</strong>.<strong>Lab</strong><br />
Optimization<br />
Updated FE<br />
Model<br />
<strong>Virtual</strong>.<strong>Lab</strong><br />
SOL200 Driver<br />
Run<br />
NASTRAN<br />
Sensitivities<br />
22 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Sensitivity and Updating<br />
! Design Parameters:<br />
! FE properties: material properties,<br />
element properties<br />
! Geometric design parameters<br />
! Connection properties<br />
! Damping properties<br />
! Supported responses:<br />
! Mass<br />
! Modal Frequencies<br />
! Vibration and transfer function<br />
responses<br />
23 copyright <strong>LMS</strong> <strong>International</strong> - 2005
MAC Updating<br />
Test<br />
MAC = 0.7 MAC = 0.95<br />
Original FE<br />
Updated FE<br />
24 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Mode Tracking<br />
Modal Frequency Mode 1<br />
Target<br />
Mode 2<br />
Nominal<br />
Nominal<br />
Design Parameter<br />
25 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Sensitivity and Updating<br />
! Sensitivity Analysis Post-processing:<br />
! Dedicated displays, using the contextual menu:<br />
• Bar charts, 2D displays<br />
! Sort the design variables:<br />
• Identify the most critical ones<br />
! Keeps associativity<br />
26 copyright <strong>LMS</strong> <strong>International</strong> - 2005
The Objective:<br />
Covering the Global Process<br />
Pre-Test<br />
Finite<br />
Element<br />
Test<br />
<strong>Correlation</strong><br />
Sensitivity<br />
Updating<br />
27 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Improving the Measurements<br />
<strong>LMS</strong> <strong>Virtual</strong>.<strong>Lab</strong> Pre-Test<br />
! Objective:<br />
! Define the optimal measurement set-up<br />
from knowledge of simulation models<br />
! What:<br />
! Creation of geometry<br />
• Measurement locations<br />
• Excitation locations<br />
! Create <strong>LMS</strong> Test.<strong>Lab</strong> file<br />
! Features:<br />
! MODMAC (Maximum Off-Diagonal MAC)<br />
! DPR (Driving Point Residue)<br />
! Benefits:<br />
! High quality and productive<br />
measurements<br />
28 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Improving the Measurements<br />
<strong>LMS</strong> <strong>Virtual</strong>.<strong>Lab</strong> Pre-Test<br />
FE Model<br />
Create Test<br />
Geometry<br />
(wireframe)<br />
Run<br />
Pre-test<br />
Analyse<br />
Performance<br />
(MODMAC, DPR)<br />
Export to<br />
Test.<strong>Lab</strong><br />
(or other)<br />
Test<br />
Model<br />
29 copyright <strong>LMS</strong> <strong>International</strong> - 2005
Summary<br />
1 Industry challenges<br />
2 Value Proposition<br />
3 Solution Highlights<br />
3.1 <strong>Correlation</strong><br />
3.2 Model Updating<br />
3.3 Pre-Test Analysis<br />
30 copyright <strong>LMS</strong> <strong>International</strong> - 2005
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