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NEi Acoustics
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NEi Acoustics (VNoise) by Scientific and
Technical Software is a PC application
designed for the analysis of a wide range of
acoustic problems, including the prediction
of internal and external structural noise
from airplanes, trains and automobiles, the
design of absorbing barriers, muffler
analysis, NVH analysis, and many others.
NEi Acoustics can be used as a simple tool
for evaluating
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response of acoustic cavities performing all the activities within the software and without the need of any external tool. It can also perform complex coupled vibro-aeroacoustic analysis integrating in an existing CAE environment for a higher level of productivity.
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Capabilities |
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Computational Core
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Solution of the Helmholtz equation for internal, external and mixed problems, with a direct BEM approach
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Isoparametric discretization of 1st and 2nd order
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Frequency response analysis
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Linear system solved using an iterative solver of the GMRES family that ensure great convergence speeds and stability
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Automatic use of out of core solver for big problems
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Fully coupled structural acoustic analysis through the coupling with modal structural equations
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Different kinds of boundary conditions, including classical pressure, and velocity conditions, as well as aperture conditions both baffled and un-baffled (for the simulation of openings)
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Sound absorbing trims with acoustics impedance
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Non-uniqueness problem solved with a CHIEF method that automatically evaluates the number and the position of the internal nodes
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Frequency interpolation for multi-frequency calculations
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Half space formulation
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Planar and axial symmetries
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Thin shell and multi-domain can be modeled with no user effort thanks to the new generalized collocation technique
User Benefits
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Accurate, stable and fast BEM solver for coupled vibro-aeroacoustic analysis at an affordable cost
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With the aid of NEiAcoustics the user can rapidly assess the impact of design choices on noise generation and transmission
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Due to the easy use of NEiAcoustics user interface, and due to the fast solution algorithm, the user can analyze and compare different configurations in short time
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A single product that scales from simple pre-design calculations to detailed large scale analysis
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Additional models for aeroacoustic analysis
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Integration with FEM/CAE platforms
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User Interface
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CAD and meshing features for modeling simple geometries
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Full Interface with FEM/CAE tools like:
- Nastran
- NEiNastran
- FEMAP
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Definition of sound absorbing material properties with customizable libraries
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Automatic Mesh Coarsening and 3D interpolation routines that permit to easily exchange data among different sources
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Simultaneous use of different models and background analysis. The user can execute a calculation while he is executing pre-post processing operations with other models.
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Full spectrum of 3D plots and animation
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Evaluation of Intensity, sound power, and specific functions for muffler performances (TL, IL)
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Audio Replay capabilities for listening to the computed noise (wave files generation for further processing outside NEiAcoustics)
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On line Helps and tutorials
Additional Modules
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NEi Acoustics Cluster Server: A Real breakthrough technology, most likely the first commercial BEM solution that enables parallel computations on a standard network of PCs, dramatically reducing computational times CAD and meshing features for modeling simple geometries
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FoxHawk: Advanced aeroacoustic tool for the evaluation of sound radiated by fans, blades and any rotating component. Acoustic analogy with the Ffowcs Williams Hawkings equation.
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