MSC ACTRAN V2020-MAGNiTUDE

Actran is a general purpose finite element program for modelling sound propagation, transmission and absorption in an acoustic, vibro-acoustic or aero-acoustic context.

A Large Material Library:

• acoustic fluid;
• thin acoustic layer and narrow tubes (or channels) including viscothermal effects;
• visco-elastic solids, solid shells, thin shells and beams;
• incompressible solids;
• composite materials;
• lumped mass and springs (discrete structural elements);
• rigid porous, lumped porous and poro-elastic materials (Biot theory)

A Complete Element Library:

• linear and quadratic
• 2D, 3D and axisymmetric
• standard volume elements and special transverse elements for the
• accurate modelling of special configurations: shells, stiffeners, thin acoustic layers
• conjugated infinite elements or adaptive PML elements for acoustic radiation

A Rich Set of Boundary Conditions, Operating Conditions and Sources:

• Acoustic sources;
• Incident and free duct modes for rotating machines;
• Pressure, velocity, acceleration and admittance boundary conditions;
• Kinematical excitations : imposed displacements and rotations;
• Mechanical excitations : point load, distributed load, distributed pressure, moments;
• In-build models of real-life excitations : incident diffuse sound field or

Various Models of Turbulent Boundary Layer

• interface with the leading structural FEA software packages (Nastran, Ansys and Abaqus) for the import of dynamical results
• interface with the leading CFD software packages (among others:Fluent, star-CD and CFX) for the import of the heterogeneities of the acoustic medium and the computation of the aero-acoustic sources
• volume-based and surface-based aerodynamic source terms (Lighthill’s and Möhring’s analogies) for analyzing broad-band noise generation by turbulent flows;

Several Unique Features (Non Exhaustive List):

• sound propagation and absorption in a non-uniformly moving fluid;
• sound propagation in non-isothermal conditions;
• sound propagation in rotating acoustic components;
• sound propagation taking into account visco-thermal losses occurring in thin air layers, tubes or arbitrarily-shaped cavities
• random acoustics in both modal and physical coordinates;

Multiple Calculation Procedures:

• direct frequency response analysis
• modal frequency response analysis using existing Actran, Ansys or Nastran normal modes
• compressible flow analysis
• modal extraction

Various Solution Strategies:

• restart capability
• multiple load capability
• strong or weak vibro-acoustic coupling
• multi-level sequence tree to avoid unnecessary re-computations
• hybrid Modal/Physical approaches in-core and out-of-core solvers supporting sequential and parallel (SMP and DMP) computer architectures
• fast frequency response synthesis using the KRYLOV solver.

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