IAR FENet 2003 Full-Vehicle NVH CAE – Conceptual Model · Gabriele FerrarottiGabriele Ferrarotti, MSC.SoftwareMSC.Software ... § ADAMS/Car Ride

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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

0%

100%

0%

100%?

Example of Development Process Desired Development Process

Vehicle Dynamics NVH

0%

100%

0%

100%

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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NVHFull-vehicle

NVH


Component And

SubsystemNVH

Component And

SubsystemNVH


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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NVHFull-vehicle

NVH


Component And

SubsystemNVH

Component And

SubsystemNVH


TrimTrim

TireTire

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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§ 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



SupplyChain

SupplyChain


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


Run trimming analysis

Write MSC.Nastran bulk data fragmentA

utom

atic

Tas

ks

Export System State Matrices

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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


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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

Documents

IAR FENet 2003 Full-Vehicle NVH CAE – Conceptual Model · Gabriele FerrarottiGabriele Ferrarotti, MSC.SoftwareMSC.Software ... § ADAMS/Car Ride