Acoustic elements - Import export

Actran AeroAcoustics Predicting the noise generated by complex flows Actran AeroAcoustics is a finite element based acoustic solver for predicting the noise generated by turbulent flows. Actran AeroAcoustics recovers aerodynamic noise sources from flow simulations performed with commercial CFD codes such as Fluent™, Star-CD™, StarCCM+™ or Powerflow™. The complete simulation procedure involves three steps: An unsteady flow simulation is performed by the CFD code. At each time step, the CFD solution (velocity, density and pressure fields) is stored in its own native format or in the Ensight™ format. Actran AeroAcoustics computes the aero-acoustic noise sources from the CFD results produced in step 1. This involves translating results from the time to the frequency domain and interpolating them from the CFD to the acoustic mesh. Maps of the aero-acoustic sources produced at this stage are in themselves useful results which can be used to identify the most effective sources. The radiated acoustic field radiated is then computed. This produces a wide set of relevant results: acoustic pressure, velocity or intensity maps, frequency response functions of various local (pressure) or global (power) quantities. This multi-step strategy offers several advantages: (1) Each part of the work can be done independently by different engineers, departments or even companies with different responsibilities or skills. (2) A single CFD simulation can feed different acoustic simulations (e.g. with different acoustic treatments). (3) The acoustic mesh does not need to be refined where the aerodynamic structures are small (for instance in the boundary layers). Actran AeroAcoustics offers high performance solvers and parallel processing features and is fully integrated in Actran VI. Actran AeroAcoustics can be combined with Actran VibroAcoustics in order to address aero-vibro-acoustic challenges. Target applications: Air conditioning modules (HVAC). Side mirror noise. Airframe noise (landing gear, trailing edge). Air distribution systems.

Acoustics Rich and powerful acoustic features for your simulation needs Actran Acoustics is the foundation module of the Actran family and is both a standalone tool and a pre-requisite for advanced modules like Actran VibroAcoustics, Actran AeroAcoustics or Actran TM. Actran Acoustics contains a wide set of acoustic modeling features making it the CAE tool of choice for simulating a large variety of problems, from the simplest component to the most elaborate system. The Actran Acoustics product relies on Free Field Technologies’ exclusive powerful, robust, fast and reliable acoustic finite and infinite element library. Sound fields in cavities are easily analyzed with Actran Acoustics which offers both modal and physical approaches. Absorbing walls may be modelled in detail using impedance conditions or porous material models. Actran Acoustics is also uniquely suited for sound radiation analysis where it brings unprecedented efficiency, speed and productivity to your analysis process. Actran Acoustics features seamless interfaces with most FEA structural analysis codes like NASTRAN, ABAQUS™ or ANSYS™. Actran Acoustics also offers powerful features for analyzing sound propagation in ducts and may be used for designing e.g. intake and exhaust lines or air distribution systems in buildings, aircrafts and cars. Among the many advanced features available in Actran Acoustics are the handling of a mean flow field (convected acoustic propagation) and temperature gradient effects. Specific elements are also available to handle visco-thermal effects important when sound waves propagates in narrow ducts or thin cavities (eg: hearing aids, solar array panels, etc.). Pressure field generated by the vibration of a powertrain. Target 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.

The primary characteristic of a wooden noise barrier is its eco-friendly nature and its praiseworthy appearance. Thanks to the use of wood, a fully renewable and recyclable raw material, the selection of woods coming from controlled forests, and a treatment with eco-friendly mineral oils, a barrier has been designed which remarkably reduces the environmental impact of roads and railways. The precision of processes, the possibility to include wide windows and the pleasant decoration of the panels make this noise-abatement system a praiseworthy architectural element.

 The acoustic features of TECNOWALL wooden noise barriers have been certified. The autoclave-impregnation treatment with especially made and antiseptic eco-friendly mineral oils guarantees its long life.
Structural elements are made part of laminated wood and part of solid wood of large-section resinous species.
 Decorative elements are made of solid wood of resinous species. The sound-absorbing material consists of minera