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2019-06-12 MDO OF GEOMETRIC VARIATION & MODAL ANALYSIS FOR SQUEAK & RATTLE PREVENTION (SKULKAR6,DTHANGAR) 1
Multidisciplinary OPTIMZATION OF GEOMETRIC VARIATIONS &
MODAL BEHAVIOUR FOR SQUEAK & RATTLE PREVENTION
MSc Thesis Students
SAIPRASAD KULKARNI, chalmers university of technology
DHARUN VELMANI THANGA RATNAM , chalmers university of technology
Supervisor
MOHSEN BAYANI, Volvo cars corporation
Sandeep shetty, volvo cars corporation
Examiner
Prof. LARS LINDQVIST, CHALMERS UNIVERSITY OF TECHNOLOGY
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MDO OF GEOMETRIC VARIATION & MODAL ANALYSIS FOR SQUEAK & RATTLE PREVENTION (SKULKAR6,DTHANGAR) 2
Agenda
- Thesis statement
- METHODOLOGY
- Geometric variation analysis
- Modal Behavior analysis
- Multidisciplinary optimization
- Results
- feedback
2019-06-12
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THESIS statement
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➢ To minimize the occurrence of Squeak & Rattle in the Interior
assemblies of premium segments of Volvo Cars.
➢ To perform Multidisciplinary Optimization for Geometric
variation analysis & Modal Behaviour analysis to find the
optimal position in an interior assembly.
MDO OF GEOMETRIC VARIATION & MODAL ANALYSIS FOR SQUEAK & RATTLE PREVENTION (SKULKAR6,DTHANGAR)2019-06-12
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MDO METHODOLOGY
Geometric
Variation
Modal
Behaviour
RD&T
Pre processor-ANSA
Post processor- Meta
Solver- NASTRAN
MDO Techniques
modeFrontier
MDO OF GEOMETRIC VARIATION & MODAL ANALYSIS FOR SQUEAK & RATTLE PREVENTION (SKULKAR6,DTHANGAR)2019-06-12 4
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INTERIOR ASSEMBLIES SUBJECTED TO SQUEAK & RATTLE
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SR.NO. CATEGORIES MATERIAL COMBINATION ASSEMBLY NAME
1 Panel - Panel Plastic - Steel Side Door
2 Panel - Structure Steel - Steel Tailgate
3 Panel Beam Metal - Metal Door outer panel - Crash Beam
4 Bracket - Panel Metal - Metal A-Pillar - IP Bracket
5Panel - Complex
Geometry (Structure)Plastic - Plastic IP Top cover - IP Deco Panel
6 Panel - Structure Plastic - Metal Glovebox - IP (dampers,latches,hinges)
MDO OF GEOMETRIC VARIATION & MODAL ANALYSIS FOR SQUEAK & RATTLE PREVENTION (SKULKAR6,DTHANGAR)2019-06-12
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Geometric variation analysis
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Measures
Weld PointsRD&T Model – Deco Panel & IP AssemblyMDO OF GEOMETRIC VARIATION & MODAL ANALYSIS FOR SQUEAK & RATTLE PREVENTION (SKULKAR6,DTHANGAR)2019-06-12
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Variation Analysis outputs following results:-
➢ Measure details
➢ Range
➢ 6 Sigma
➢ 8 Sigma
➢ Nominal values
➢ Mean
➢ Mean shift
Geometric variation analysis
2019-06-12 7MDO OF GEOMETRIC VARIATION & MODAL ANALYSIS FOR SQUEAK & RATTLE PREVENTION (SKULKAR6,DTHANGAR)
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Modal behavior analysis
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C-Bush Elements
ANSA Model - Deco Panel & IP Assembly MeasuresMDO OF GEOMETRIC VARIATION & MODAL ANALYSIS FOR SQUEAK & RATTLE PREVENTION (SKULKAR6,DTHANGAR)2019-06-12
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Eigen Mode ANALYSIS
2019-06-12 9MDO OF GEOMETRIC VARIATION & MODAL ANALYSIS FOR SQUEAK & RATTLE PREVENTION (SKULKAR6,DTHANGAR)
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Dynamic stiffness (magnitude) plots – Normal
2019-06-12 10MDO OF GEOMETRIC VARIATION & MODAL ANALYSIS FOR SQUEAK & RATTLE PREVENTION (SKULKAR6,DTHANGAR)
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Modefrontier setup
2019-06-12 11MDO OF GEOMETRIC VARIATION & MODAL ANALYSIS FOR SQUEAK & RATTLE PREVENTION (SKULKAR6,DTHANGAR)
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DESIGN OF EXPERIMENTS
2019-06-12 12MDO OF GEOMETRIC VARIATION & MODAL ANALYSIS FOR SQUEAK & RATTLE PREVENTION (SKULKAR6,DTHANGAR)
FULL FACTORIAL SETUP
For k factors, each at 2 levels, a full factorial design has 2k runs.
i.e. 28 runs (since input variables =8)
No.of Design Samples = 256
Feasible designs = 70
Unfeasible designs = 186
For combination of 4 input
variables as design sample
nCr =n !
r ! (n − r)!,
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RESULTS
2019-06-12 13MDO OF GEOMETRIC VARIATION & MODAL ANALYSIS FOR SQUEAK & RATTLE PREVENTION (SKULKAR6,DTHANGAR)
PARALLEL COORDINATE CHART
70 Feasible soltuions
8 input variables & 2 objectives
2 Feasible soltuions
8 input variables & 2 objectives
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results
2019-06-12 14MDO OF GEOMETRIC VARIATION & MODAL ANALYSIS FOR SQUEAK & RATTLE PREVENTION (SKULKAR6,DTHANGAR)
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feedback
2019-06-12 15MDO OF GEOMETRIC VARIATION & MODAL ANALYSIS FOR SQUEAK & RATTLE PREVENTION (SKULKAR6,DTHANGAR)
Thank you !