Actran Acoustics

Powerful Acoustic Simulation Software
Improve the acoustic performance of your designs with this complete simulation solution used by leading manufacturers around the world.

Actran is the premier acoustics software to solve acoustics, vibro-acoustics, and aero-acoustics problems. Used by automotive manufacturers and suppliers, aerospace and defense companies, and consumer product manufacturers, Actran helps engineers better understand and improve the acoustics performance of their designs.

Actran provides a rich library of material models, a complete element library that includes infinite elements, high performance solvers to solve large size problems and a user-friendly GUI that is highly customizable to your needs. Actran, with its modular nature, can be deployed based on your applications and requirements.

Actran Acoustics is the foundation module of the Actran family. It is both a standalone tool and is a pre-requisite for advanced modules like Actran VibroAcoustics, Actran AeroAcoustics and Actran TM. Some of the robust capabilities of this module include:

  • Simulate standard and convected acoustics
  • Extract acoustic modes
  • Analyze sound field in cavities, with either modal or physical approaches
  • Model absorbing walls using impedance conditions of porous material models
  • Analyze sound radiation
  • Analyze sound propagation in ducts, intake and exhaust lines or distribution systems in buildings, aircrafts, and automobiles
  • Recover vibration results from most FEA structural solvers for radiation analysis
Sample Applications:
  • Sound radiation by vibrating structures: powertrain, engine components (oilpan, intake manifold and air filter, valve cover, etc.), compressors, electrical motors, loudspeakers and more.
  • Intake and exhaust noise, including complex mufflers and silencers.
  • Air conditioning units and distribution systems (calculation of transfer matrices coefficients).
  • Sound absorption inside passenger compartment of cars, trains and aircrafts.
  • Sound propagation in complex media with mean flow or temperature gradient.
  • Audio devices such as telephones, hearing aids or musical instruments.


Actran VibroAcoustics

A robust, reliable, and high performing vibro-acoustic CAE module

In order to study the interaction of structural vibration with the adjacent fluid, it is necessary to model the acoustic behavior of the involved structural components. This can be achieved with the rich material library of Actran, that includes the conventional material for acoustic or visco-elastic media, porous or incompressible media, composite materials or active components like piezo-electric ceramics. If you prefer, a modal basis of the structure may also be imported from most structural FEA codes.

With the ability to simulate realistic modeling boundary conditions by combining dynamic, kinematic and acoustic constraints, as well as physical excitations like diffuse sound field and turbulent boundary layer, you can obtain accurate representation of the acoustic performance of your designs. In addition, you also have the ability to combine this capability with Actran AeroAcoustics to giving you the ability to model complex aero-vibro-acoustic problems.

Sample Applications:
  • Automotive: Noise related problems from powertrains, intakes, exhausts, passenger compartment, trim, seats, hoses, tires, windows and windshields, audio, HVAC.
  • Aerospace: Sound transmission through cockpit and fuselage, noise propagation in air distribution system, response to TBL excitation, random dynamic response of rocket payload at take-off.
  • Comsumer goods: Telephones, headsets, loudspeakers, hearing aid devices, disk drives, washing machines, refrigerators, cameras.
  • Defense: Underwater acoustics, sonars.


Actran AeroAcoustics

Predicting the noise generated by complex flows

Use this module to predict the noise generated by turbulent flows. Actran AeroAcoustics recovers aerodynamic noise sources from flow simulations performed with commercial CFD codes such as FluentTM, Star-CDTM, StarCCM+TM or PowerflowTM. The results from an unsteady flow simulation obtained from a CFD analysis are imported to the AeroAcoustics module, which then computes the aero-acoustic noise sources from the results. In addition to the Actran Acoustics features, this module provides several other capabilities to help you address aero-acoustics problems efficiently.

Actran AeroAcoustics offers high performance solvers and parallel processing features and is fully integrated in Actran VI.

Actran AeroAcoustics can also be combined with Actran VibroAcoustics in order to address aero-vibro-acoustic challenges.

Sample applications:
  • Air conditioning modules (HVAC).
  • Side mirror noise.
  • Airframe noise (landing gear, trailing edge).
  • Air distribution systems.


Actran SNGR

Predicting the noise generated by complex flows from steady CFD solutions

Use this module to predict the noise generated by turbulent flows from steady CFD solutions. Actran SNGR recovers aerodynamic noise sources from flow simulations performed with commercial CFD codes such as Fluent™, Star-CD™, StarCCM+™ or OpenFOAM™. The results from an steady flow simulation obtained from a RANS CFD analysis are used from the Actran SNGR to synthesize the noise sources, These sources are then imported into an acoustic computation and are then propagated. Actran SNGR allows addressing the noise generated from turbulent flows in a much faster way than classic aero-acoustic approaches and it is specifically useful when relative levels between different designs are needed such as in optimization loops.

Actran SNGR offers high performance solvers and parallel processing features and is fully integrated in Actran VI.

Actran SNGR can also be combined with Actran VibroAcoustics in order to address aero-vibro-acoustic challenges.


Sample applications:
  • Air conditioning modules (HVAC).
  • Side mirror noise.
  • Airframe noise (landing gear, trailing edge).
  • Air distribution systems.


Actran TM

A powerful acoustic CAE tool for turbomachinery noise prediction

Use Actran TM to analyze the sound radiated by turbomachinery and to optimize the related acoustic treatments. One of the challenges of acoustic CAE methods is handling of large models associated to high wave number and to large geometrical size and complexity. Actran TM provides efficient solver technologies to address this problem, which includes advanced parallel processing.

In addition to studying aircraft engines, Actran TM can be used to analyze inlet and outlet liners for helicopter turbines, environmental control systems, and auxiliary power units, and for non-aerospace applications like computer cooling systems. Actran TM can be complemented by Actran DGM to solve problems involving complex shear layers and flow gradients occurring at engine exhaust.

Sample Applications:
  • Aircraft engine noise, including nacelle design
  • Ducted cooling systems (electronic devices)
  • Blower systems (air conditioning modules)
  • Helicopter turbine noise


Actran for Trimmed Body

Advanced vibro-acoustic analysis combining Actran and MSC Nastran

Actran for Trimmed Body is a powerful tool for modeling and analyzing complex vibro-acoustic systems such as trim components. Such components are usually made of materials with high damping and strong acoustic absorption characteristics; as such they have a significant influence on the overall vibro-acoustic behavior of the structure.

Actran for Trimmed Body provides CAE engineers advanced features for mixing the best of both worlds: Actran physical model and Nastran modal model. Three types of combined models may be created:

  • Actran for Trimmed Body is able to merge a set of Actran models of individual trim components with a Nastran body-in-white model in order to create a fully trimmed body vibro-acoustic model.
  • An Actran model may be set in its real-life working environment by connecting it to an existing Nastran model (e.g. a detailed Actran model of a layered windshield may be connected to a Nastran model of the vehicle body).
  • A Nastran model may be enriched by including a reduced Actran model of a specific component. The Actran component is defined as a DMIG data block in the Nastran deck.
Sample Applications:
  • Acoustic transmission through components in real-life mounting conditions
  • Trimmed body modeling using a combination of Actran detailed models in physical coordinates and a Nastran body-in-white modal model


Actran DGM

Jet engine exhaust noise modeling

Actran DGM solves the linearized Euler equations using discontinuous finite elements and is used for predicting the noise propagation in complex physical conditions. It is particularly well suited to solving aero-acoustic problems at the exhaust of a double flux aero-engine, including effects such as propagation through strong shear layers, high temperature gradients and non-homentropic mean flows.

Actran DGM uses an unstructured mesh method, and is not constrained by standard limitations of Finite Difference Method. As the order of the elements is automatically adapted, the mesh can be non-homogeneous, with a combination of very small and large elements in the same mesh, without any performance degradation.

Sample Applications:
  • Exhaust of turbomachines
  • Inlet of large turbomachines
  • All acoustic propagation problems with non-homogeneous mean flow conditions


Actran VI

Dedicated pre and post-processor for the Actran CAE software family

Actran VI is the new graphical user interface specifically designed for pre- and post-processing vibro- and aero-acoustic analyses of all Actran modules.

Including an Actran input file reader to check or modify input files generated by other tools, Actran VI supports several mesh formats (Nastran BDF, ANSYS RST and CDB, Actran DAT and NFF, I-DEAS UNV, Patran Neutral Format) as input for creating Actran input files.

Its various integrated pre-processing tools ease the creation and editing of Actran models. It is easy to visualize specific Actran model features (such as modal basis, sources or infinite elements coordinate system), to specify the projection parameters between incompatible meshes, to insert additional entities (e.g. control points) or to visualize the specified boundary conditions. Additionally, it is also possible to define analysis templates (with or without mesh) to ease the creation of recurrent analyses.

The post-processing tool supports different results formats, such as OP2, UNV, NFF, RST, HDF and punch files. It contains different visualization modules, such as contour plots (maps), iso-surfaces, vectors or deformations, which can be freely combined and controlled using different filters. Synchronized viewports makes it easy to compare results at different frequencies, phases, times or related to different load case.

An animation module dedicated to complex harmonic results coupled with video export capabilities is also included.

Actran VI includes the PLTViewer and WaterfallViewer modules for easily displaying and handling frequency response functions, in single or multiple loadcases.

Sample Applications:
  • Validation, visualization and modification of existing Actran analyses.
  • Creation of new Actran analyses.
  • Display of all Actran results.