Lightweighting with Improved NVH

This presentation was made at the 2019 NAFEMS World Congress in Quebec Canada

Resource Abstract

This paper illustrates CAE co-simulation of different MSC tools to bridge the gap between manufacturing processes and structural analysis for lightweighting with improved NVH.



As is well known, composites are essential for weight reduction and as it is generally quite difficult to capture the correct local anisotropic behaviors of such materials. Only a material model based on the underlying matrix and fiber properties that takes into account the fiber orientation distribution throughout the part can accurately predict the stiffness and damping behavior of the part.



In this paper, results will show the chaining of Digimat, MSC Nastran and Actran complete the process chain for the industry. Digimat is used for mapping fiber orientation automatically for each frequency. Using the option to select different manufacturing processes such as injection molding, under Digimat RP material cards for real stiffness and damping are mapped onto elements function of local fiber orientation from injection simulation. For N frequencies defined through FREQ1 card, N sets of material cards will be written by Digimat. MSC Nastran DMAP is available to read these N sets of material cards for each frequency and then apply them one by one for each frequency defined in FREQ1 cards, this is how frequency dependency is taken into account in FRF analysis. MSC Nastran’s NVH solutions provide information about vibration modes, and how the structure responds to external loading factors. This information is then used to perform coupled acoustics predictions for interior or exterior noise with Actran.



Weight reduction is becoming ever more critical across the transportation industry and computer-aided engineering (CAE) design tools are playing an increasingly important role in achieving so-called ‘lightweighting’.



This paper illustrates the application of computer-aided engineering tool-chains and co-simulations led by MSC Nastran for structural analysis, and Actran for acoustics, to achieve this end. We also include crucial complex materials property simulation and manufacturing effects using Digimat to bridge the gap between structural analysis predictive design tools and manufacturing processes used for lightweighting.



While materials properties are well understood in design applications of uniaxial fiber composites, other technologies must be incorporated to handle more complex composite architectures and account for manufacturing in the design criteria.



After accurate material modeling, MSC Nastran’s NVH solutions provide information about vibration modes, and how the structure responds to external loading factors. This information is then used to perform coupled acoustics predictions for interior or exterior noise with Actran. We address these in this project.



Finally, we also discuss underlying business drivers for lightweighting and market needs, as well as computer-aided engineering simulation tooling trends. We show results of the complete process simulation chain for the design of representative transportation systems. The paper discusses the impacts on design engineering of these new material systems, the changes needed in certification and validation approaches in engineering design, and the need to incorporate manufacturing simulation in both the design AND manufacturing process to ensure a safe and optimal application of these new materials for lightweighting in the transportation industry.

Document Details

ReferenceNWC_19_217
AuthorGadhia. B
LanguageEnglish
TypePaper
Date 18th June 2019
OrganisationMSC Software
RegionWorld

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