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ABEC3-Introduction

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ABEC stands for Acoustic Boundary Element Calculator.

ABEC has on board a Boundary Element and a Lumped Element solver, which fully couple. Further there is available the Direct Sound mode.

The Boundary Element Method is for acoustics only, typically the more complicated parts of a loudspeaker such as vented enclosures, multiple drivers, waveguides and radiation. The Boundary Element part of ABEC can also be used to investigate the response of small rooms and all kinds of other acoustic problems.

The Lumped Element Method typically is used to model electro-acoustic structures. The LE-part is very similar to the legacy system Akabak, allowing to simulate various responses including filters, electronics, mechanics and acoustics.

The Direct Sound Mode calculates an acoustic field without diffraction and reflections. This approximate approach does not need a solving stage. It can be very practical in estimating the sound pressure distribution of a large scale audience, or it can be used to design cross-over filters for loudspeakers.


The Boundary Element and the Lumped Element parts can be fully coupled, see AES Paper. The coupling allows to attach complicated acoustic structures to an electro-acoustic network. Further the coupling is done at observation stage, which has the advantage that changing the LE-script does not makes necessary a re-solving.

ABEC supports sub-domain modeling. Sub-domain modeling is powerful for larger acoustic systems, such as vented loudspeaker enclosures or horns, for example. In BEM it is the only way to deal with certain cases of radiation from an Infinite Baffle.

ABEC recognizes multiple domains automatically, which typically arise if volumes are decoupled, for example the modeling of a sealed loudspeaker enclosure.

ABEC standard mode is 3D but also supports the axis-symmetric and the 2D mode.


ABEC is simple to use. The structure is entered with the help of scripts similar to other finite element programs. ABEC will auto-mesh the structure in order to satisfy the frequency-criterion. It is also possible to import mesh-files, which facilitates the input with the help of CAD-applications. Also supported are vibrational data-files, see www.Klippel.de. Scripts can be parameterized with the help of formula systems.


ABEC comes with a desktop application, which organizes the input scripts and data-files, renders the structure and resulting fields as a 3D-picture and manages the observation of fields and spectra. After the solving stage, the response can be observed immediately. Sound pressure fields can be displayed as contours inside ABECs OpenGL viewer. Spectral response curves at any point in space can be calculated and rendered with the help of our graphic engine VACS. The coupling between ABEC and VACS is seamless and fully automatic.


ABEC supports parallel processing and 32 and 64 bit architectures.

The professional version stores and retrieves result-files of the solver automatically.

A range of examples is copied to your computer during installation.

The user-manual comes in form of a help-system, where each item and all parameters are explained. If you want to have a look before installation, here you can download the help-file.


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