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Introduction to Actran Release 13 - Cuvix · PDF file• Direct & iterative solvers,...

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  • Introduction to Actran Release 13 Release Highlights

    Jonathan Jacqmot

    30 October 2012

  • A quick introduction to the Actran software

    Actran R13.0 Release Highlights

    Actran R13.0 Requirements

    Summary

    Agenda

  • The Actran Software Suite

    Actran Vibro-Acoustics Actran Aero-Acoustics Actran TM

    Actran Acoustics

    Actran DGM

    Actr

    an V

    I

    Actran for Nastran

  • FE domain

    IE domain Acoustic FEM/IFEM approach

    Multi-purpose toolbox: several computational sequences

    Direct Frequency Response

    Modal Frequency Response for interior problems

    Hybrid Modal-Physical Response the best of both worlds

    Modal Extraction for undamped structure or cavity

    + Compressible Flow potential flow solver

    + Frequency response using a time domain LEE Solver = Actran DGM

    + Transient solver

    Linux or Windows platforms

    Direct & iterative solvers, multiple load & restart

    Several types of parallelism available

    Actran Solver

  • Improved Physics

    Rigid body elements

    Porous Miki model

    Boundary Conditions

    BC_MESH Integration method

    Actran DGM: Velocity BC

    Actran DGM: Thompson BC

    Actran DGM: Transfer admittance

    Perfectly Matched Layers

    Analysis Schemes

    Combination of modal/physic approach and staggered solver

    Inputs/Outputs

    Selection of output requests

    Specification of tolerance lists

    Specification of storage nodes for modal components

    Handling of names for all components, materials, tables,

    High Performance Computing

    Parallelism for Aero-Acoustic computations

    Reduction of parallel NFF databases

    Actran DGM: performance improvements

    1st level Multi-parallelism

    What is New in R13.0 in a Nutshell

    Ease of Use

    Minimal number of elements per wavelength are

    indicated during the computation

    Thickness of a composite can be retrieved

    automatically

    NAS2ACT utility

    RADACT supports multiple loadcase

    computations

    Support of a global damping in a composite

    material

    ICFD: supersonic flows regularizations

    ICFD: Make CFD periodic in space

    ICFD: Symmetry of flow fields

    Actran VI

    Reading comments from external formats

    Reading comments from NFF databases,

    including the mode orders,

    Picking nodes is now enabled, allowing to create

    storage nodes, measuring distances or to

    interpret results in the PLTViewer

    Validating an Actran analysis in Actran VI

    Inertias of beams can now be visualized

    Automatic detection of modal basis parameters

    Visualization of boundary conditions

  • Description:

    Alternative/complement to infinite elements for the

    radiation in free field

    Extra-layer of finite elements used to

    progressively damp the acoustic wave non-

    reflecting boundary condition

    Application: Larger models and higher

    frequencies

    Benefits: Lower CPU requirements

    Remarks:

    SPL available in far field thanks to fully automated

    FWH solver

    Infinite elements should be preferred for low

    frequencies analysis

    Not compatible with convected wave analysis

    Perfectly Matched Layers (PML)

  • Description: Model rigid structural or

    acoustical connections

    Equivalent to Nastrans RBE2

    elements for structural connections

    Applicable to fluid

    Selective degrees of freedom

    connections

    Benefit: Improve the accuracy of

    complex vibro-acoustic models

    Applications:

    Rigid connections between different

    parts

    Distributed punctual loads

    Selective transmission of motion

    Rigid Body Elements

    BEGIN COMPONENT 1

    RIGID_BODY

    DOMAIN rigid_body_element

    DOF_TO_LINK IMMMMMM

    END COMPONENT 1

  • Description:

    Semi-empirical model

    Only the flow resistivity required

    Benefit: More accurate representation

    than Delany-Bazley model

    Comparison of the formulations on impedance tube test

    Miki Porous Model

    Porous

    Rigid support

    Low density foam Plastic foam (rigid) High density foam

    BEGIN COMPONENT 1

    MIKI_POROUS

    MATERIAL 1

    DOMAIN Porous_domain

    END COMPONENT 1

  • Description:

    Model real-world microphones sensitive to the frequency and

    the directivity of the acoustic field (mic. dimensions, electrical

    and mechanical impedance,)

    Directive microphones available as a complement to

    conventional ideal field points

    Benefit: Improve the fidelity of the numerical models

    In practice: The pressure field computed at the field point will be corrected according to the directivity of the micro &

    the incidence angle of the acoustic wave

    Directive Microphones

    refV

    0

    90

    180

    Ref. direction [x,y,z]

    refV

    )p(f).c(f)(fpc ,,

    BEGIN MICROPHONE 2

    MICROPHONE_FRF TXT frf.txt

    MICROPHONE_DIRECTIVITY TXT directivity.txt

    REFERENCE_DIRECTION 0. 0. 1.

    1

    20000 0.5 0.0 0.0

    END MICROPHONE 2

  • Description: As for aero-acoustic sources, Actran can use the integration

    method for mapping the vibration levels for a radiation analysis

    Application: Radiation of any vibrating structure such as a gearbox or a

    powertrain

    BC Mesh Integration Method 1

    Acoustic nodes (coarse) Possible loss

    of information

    Linear interpolation from the structure mesh to the acoustic nodes

    structure mesh (fine)

    Standard sampling

    structure nodes (fine)

    acoustic nodes (coarse) All information is conserved

    in the process !

    Integration

    mapping

  • Benefits: coarser acoustic meshes can be used

    Computation time reduced and resource saved

    Higher frequencies can be reached

    BC Mesh Integration Method 2

    In practice: use keyword

    METHOD INTEGRATION

    BEGIN BC_MESH 1

    NFF structure.nff

    SURFACE 1

    TOLERANCE_LIST 1

    BC_FILE structure.nff

    BC_FORMAT NFF

    DISPLACEMENT

    METHOD INTEGRATION

    END BC_MESH 1

    NEW

    INTEGRATION

    METHOD

    STANDARD

    SAMPLING

    METHOD

  • Description: a translator can be directly accessed from Actran VI

    Most relevant Nastran cards for vibro-acoustics are supported and interpreted:

    Most shells, solids, fluids including infinite fluids

    RBE2, CBUSH, CELAS, CONM2,

    FREQ, FORCE, SPC1,

    Element depending information in Nastran cards are translated into FIELDs

    Compression of PIDs can be automated

    Equivalent Nastran input file is created for comparing the equivalence of the Actran case

    Benefits:

    Create Actran vibro-acoustic model easier and faster. Easier and faster creation of Actran vibro-

    acoustic model

    Improve/update the translated model with Actran features (visco-thermal elements, porous

    elements, )

    Nastran to Actran Translator

    Nastran

    input file

    Equivalent Nastran

    input file

    Actran Input

    FIELDs containing:

    Element orientation

    Offsets

  • Benefit: Increase the clarity of imported meshing data

    Description:

    Comments provided in Bulk Data Files can now be interpreted from:

    Ansa

    Patran

    And others

    Actran comments are now also stored in the NFF result database to

    ease the display of results

    Actran VI: Management of Comments

  • Node picking selection has been improved to:

    1. Create 0D entities directly into the mesh

    2. Access FRF results from an imported map

    3. Measure distances and/or angles between different nodes

    Actran VI: Node Picking Enhancements

    1 2

    3

  • Description: visualize the following imposed conditions for any

    structure node

    displacement

    rotation

    point load

    point moment

    Benefit: Better control of the application of boundary conditions within

    Actran VI

    Actran VI: Visualize Boundary Conditions

  • Description & benefit: Simulation results can be heard directly from

    PltViewer using your favorite audio player!

    In practice:

    1. right-click on any point fluid pressure result and select Convert to audio

    2. A .wav file will also be generated

    PltViewer: Listen to your Simulation Results

  • Ease of use

    Performance

    Multiple new capabilities

    Key Highlights

    Perfectly Matched Layers (PML)

    Rigid Body Elements

    Integration Method for Radiation Analysis

    Nastran To Actran translator

    Actran VI improved look and feel

    Please download and enjoy Actran 13 !

    Summary

  • Thank you for your attention!

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