• Frequency response with Direct and Indirect BEM.
• Mixed domain and multi-domain formulations.
• Internal, External and mixed problems. All the formulations (Direct, Indirect, mixed domain and multi domain) can be used contemporaneously for different parts of the same model.
• Fully coupled structural-acoustic analysis through the coupling with modal structural equations.
• Contribution Vectors for fast multi frequency radiation analysis (i.e. engine run up).
• Extremely complete set of boundary conditions, including pressure, velocity, and robin conditions, as well as free edges, radiation conditions, and baffled and un-baffled aperture, for openings simulation.
• Sound absorbing trims with acoustic impedance.
• Complex speed of sound and densities, for modelling bulk reacting materials.
• Different speed of sound and densities for different domains in the same calculation.
• User customizable coupling conditions at interfaces between different domains.
• Impedance and transfer matrix relations for black box modelling of filters and other acoustics elements.
• Modelling of perforated tubes and surfaces.
• Frequency interpolation for multi frequency analysis.
• Half space formulation, planar, and axial symmetries.
• Fully automatic, and extremely robust routine for CHIEF nodes.
• Isoparametric discretization of 1st and 2nd order.
• Monopole and dipole sound sources with user customizable frequency dependent intensity.
• User customizable sound source by direct import of pressure.
• Linear system solved using an iterative solver of the GMRES family that ensure great convergence speeds and stability.
• Direct Solver for small sized problems.
• Automatic use of out of core solver for big problems.
• Multiple load case analysis.
• Random Vibroacoustic analysis with evaluation of principal components response matrix (multiple load case analysis) from principal components PSD of excitation.

FWH Solver

• Sound radiated by aeroacoustic sources such as rotating blades, fans, and turbulence.
• Use unsteady pressure computed by CFD codes for the evaluation of radiated sound using an acoustic analogy based on the integration of the full FWH equations.
• Interface with CFD codes (Fluent).

User Interface

• PC Based (Windows XP/2000/NT).
• CAD and meshing features for modelling simple geometries.
• Full Interface with FEM/CAE tools including NASTRAN (bulk, f06, MSC op2, punch), ANSYS (rst), FEMAP, NEiNastran, Patran Neutral Files.
• Automatic features for converting FEM meshes into BEM meshes (Free edge and intersection detection, nodes disconnection, normal orientation check, hole closure, Volume elements skin detection, check for degenerated elements).
• Batch file for automating multiple operations and analysis.
• Easily programmable TAG based ASCII file format (VNoiseX) for automating import/export operations.
• Advanced import features for managing large FEM results files.
• Fully Automatic Mesh Coarsening based on an edge collapsing technique tailored for acoustic.
• Modal and velocity data projection with stable and accurate 3D interpolation and integration routines that permit to easily exchange data among different sources and discretizations.
• Simultaneous use of different models and analysis in background. The user can execute a calculation while he is executing pre-post processing operations with other models.
• Complete set of 2D and 3D plots and animations.
• Evaluation of Intensity, SPL, RMS, dBA, dBC, 1/3 octave, and specific functions for Transmission Loss and Insertion Loss.
• Sound Power evaluation from direct Intensity integration or from ISO procedures.
• Audio Replay capabilities for listening to the computed noise (wave files generation for further processing outside VNoise).
• Microphones arrays (Spherical, annular, planar).
• Structural forces and pressure distributions.
• Complete documentation and tutorials.
• On line technical support.

FEMAP/NeiNastran Interface

• Direct link that permits to exchange model and data with FEMAP/NeiNastran.
• Through FEMAP provide VNoise interface to the CAD tools supported by FEMAP (CATIA, Pro/Engineer, AutoDesk, SolidWorks and Solid Edge).

VNoise Cluster

• Distribute huge calculations across a simple PC network. No configuration needed.
• Impressive increase of computational power at a low software and hardware cost.