iar fenet 2003 full-vehicle nvh cae – conceptual model · gabriele ferrarottigabriele ferrarotti,...
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IAR IAR FENetFENet 2003200344--5 5 DecemDecemberber 20032003
IAR IAR FENetFENet 2003200344--5 5 DecemDecemberber 20032003
An Integrated Approach to Ride, Vibration and Acoustic
Engineering
Christoph OrtmannBusiness Development Director
An Integrated Approach to Ride, An Integrated Approach to Ride, Vibration and Acoustic Vibration and Acoustic
EngineeringEngineering
Christoph OrtmannChristoph OrtmannBusiness Development DirectorBusiness Development Director
Gabriele Ferrarotti, MSC.SoftwareGabriele Ferrarotti, MSC.Software
§ For automotive applications…LoadsLoads VehicleVehicle ResponseResponse
Full-Vehicle NVH CAE – Conceptual Model
Force VibrationStructural-Structural
Volume Velocity NoiseAcoustic-Acoustic
Structural-AcousticsAcoustic-Structural
LoadsLoads SystemSystem ResponseResponse
Full-Vehicle N&V CAE – Conceptual Model
§ …and aerospace applications…
Force VibrationStructural-Structural
Volume Velocity NoiseAcoustic-Acoustic
Structural-AcousticsAcoustic-Structural 0
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MBS-based NVHMBS-based NVH
FE-based NVHFE-based NVH Ray-Tracing based NVHRay-Tracing based NVH
SEA-based NVHSEA-based NVHFull-vehicle
NVHFull-vehicle
NVH
FE-based NVHFE-based NVH
Component And
SubsystemNVH
Component And
SubsystemNVH
MSC.Software solutionsfor predictive NVH
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Vehicle Dynamics NVH
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Example of Development Process Desired Development Process
Vehicle Dynamics NVH
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MBS-Based Full-Vehicle NVH
§ ADAMS/Car Ride§ Relies on ADAMS/Car, the industry standard tool for system-
level virtual prototyping in the automotive industry§ Allows usage of scalable prototypes for vehicle dynamics AND
ride&comfort§ Positions predictive NVH up-front in
the design process
MBS-Based Full-Vehicle NVH
§ ADAMS/Car Ride – Process§ A validated ADAMS/Car handling model is available§ Replace rigid bodies (I.e. body) with flexible bodies§ Include additional flexible bodies (I.e. exhaust system)§ Replace connection elements (I.e. bushing, tires) with
frequency dependent components§ Perform ride&comfort simulation§ NVH-related postprocessing
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MBS-Based Full-Vehicle NVHMBS-Based Full-Vehicle NVH
§ Example: Component Replace
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MBS-based NVHMBS-based NVH
FE-based NVHFE-based NVH Ray-Tracing based NVHRay-Tracing based NVH
SEA-based NVHSEA-based NVHFull-vehicle
NVHFull-vehicle
NVH
FE-based NVHFE-based NVH
Component And
SubsystemNVH
Component And
SubsystemNVH
MSC.Software solutionsfor predictive NVH
Basic design Design modification
?
Optimization of Acoustic EmissionsOptimization of Acoustic Emissions FE-based Component-level NVH§ MSC.Actran§ General-purpose vibroacoustic solution§ Originated from a consortium of
international companies
§ Automotive applications:§ Engine & powertrain acoustic radiation§ Exhaust & intake systems vibro-acoustic
performance § Tire noise§ Trim components acoustic characterization
§ Aerospace applications:§ Acoustic trimming modeling§ Trimmed body applications§ Detailed absorption material modelling§ Engine noise radiation§ Design of the intake and the exhaust system
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FE-based Component-level NVH
§ Acoustic Radiation Solutions§ Application§ Engine – powertrain§ Engine auxiliaries (oilpan, manifold, gearbox,…)§ Engine compartment insulation
§ Excitation§ Mechanical force at bearings§ Vibration patterns
§ Physical model§ Unequal structural & acoustical meshes§ Mode-by-mode radiation analysis§ Solvers
§ Fast FRF Krylov solver§ SuperLU parallel solver
Business: Automotive Tier 1
Challenge: Improve acoustic performance of windshield
Solution: Rely on MSC.Actran to simulate the acoustic transmission of layered windshield
Value: Optimize acoustic transmission. Deliver component model to OEM to be plugged into body NVH prototype
FE-based Component-level NVH
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1 10 100 1000 10000 HzHz
MBS-based NVHMBS-based NVH
FE-based NVHFE-based NVH Ray-Tracing based NVHRay-Tracing based NVH
SEA-based NVHSEA-based NVHFull-vehicle
NVHFull-vehicle
NVH
FE-based NVHFE-based NVH
Component And
SubsystemNVH
Component And
SubsystemNVH
MSC.Software solutionsfor predictive NVH
TrimTrim
TireTire
FE Data fromexisting vehicle programs
FE Data fromexisting vehicle programs
SupplyChain
SupplyChain
Full-vehicle NVH Simulation
MBS-Based ComponentsMBS-Based Components Test-Based ComponentsTest-Based Components
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Full-vehicle NVH Simulation
§ Unified Environment
§ Preprocessing
§ Full-vehicle assembly
§ Automatic closing of holes in BIW
§ Automatic cavity meshing
§ Simulation
§ Relies on MSC.Nastran2004 fluid-structure coupling algorithm
§ Dramatic improvement of ACMS performance
§ Postprocessing
§ NVH-related plotting/animation
TrimTrim
TireTire
FE Data fromexisting vehicle programs
FE Data fromexisting vehicle programs
SupplyChain
SupplyChain
Full-vehicle NVH Simulation
MBS-Based ComponentsMBS-Based Components Test-Based ComponentsTest-Based Components
Open ADAMS/Car Assembly
Select body to be excluded from export (existing MSC.Nastran model)
Model Setup + Map MSC.ADAMS attachments to MSC.Nastran GRID IDs
Full-vehicle NVH Simulation
Run trimming analysis
Write MSC.Nastran bulk data fragmentA
utom
atic
Tas
ks
Export System State Matrices
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1 10 100 1000 10000 HzHz
MBS-based NVHMBS-based NVH
FE/IFE-based NVHFE/IFE-based NVH Ray-Tracing based NVHRay-Tracing based NVH
SEA-based NVHSEA-based NVH
Full-vehicleNVH
Full-vehicleNVH
FE-IFE based NVHFE-IFE based NVH
MSC.Adams (S.B.)MSC.Adams (S.B.)
MSC.Nastran (S.B.) + MSC.Actran (S.B. + A.B.)MSC.Nastran (S.B.) + MSC.Actran (S.B. + A.B.)
MSC.Nastran (S.B.) + MSC.Actran (S.B. + A.B.)MSC.Nastran (S.B.) + MSC.Actran (S.B. + A.B.)
Component And
SubsystemNVH
Component And
SubsystemNVH
EnergyFlow
Method
EnergyFlow
Method
MSC.Software solutionsfor predictive NVH
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In conclusion...
§ Virtual Product Development applied to the N&V process:§ MBS-based full-vehicle N&V solutions§ Leverage handling models to ride&comfort engineering
§ Share MBS models with N&V team
§ FE-based component-level N&V§ General-purpose vibroacoustic solution
§ Enables optimization of component vibroacoustic behavior up-front in the design process
§ FE-based full-vehicle N&V solutions§ Support assembly of system-level N&V prototype
§ Facilitate collaboration throughout supply chain