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Actran
ACTRAN (acronym of ''ACoustic TRANsmission'') is a finite element-based computer aided engineering software modeling the acoustic behavior of mechanical systems and parts. Actran is being developed by Free Field Technologies, a Belgian software company founded in 1998 by Jean-Pierre Coyette and Jean-Louis Migeot. Free Field Technologies is a wholly owned subsidiary of the MSC Software Corporation since 2011.〔http://schnitgercorp.com/2011/09/06/msc-acquires-fft-actran/〕
== History ==
The development of Actran started in 1998 when Jean-Pierre Coyette, now professor of the Louvain School of Engineering – Université catholique de Louvain, and Jean-Louis Migeot, now professor at the Université Libre de Bruxelles and past-president of the Royal Academy of Science, Letters and Fine Arts of Belgium - Académie royale des sciences, des lettres et des beaux-arts de Belgique, cofounded the Free Field Technologies SA software company.
The original idea was to develop a finite element-based simulation tool for vibro-acoustic applications able to overcome the limitations of the then dominant Boundary Element Method. The use of finite elements enabled the simulation of complex noise sources, the combination of multiple materials in the same model and the handling of multi-million degrees-of-freedom models. The initial target application was the prediction of the acoustic transmission through complex partitions (hence the name ACTRAN: ACoustic TRANsmission). A central feature of Actran was the use of Infinite Elements (IE) as an alternative to BEM for modelling non-reflecting boundary conditions and calculating the far field. Actran uses conjugated infinite elements, an extension of the wave envelope technique.〔Astley, R. J., Macaulay, G. J., & Coyette, J. P. (1994). Mapped wave envelope elements for acoustical radiation and scattering. Journal of Sound and Vibration, 170(1), 97-118.〕〔Astley, R. J., Macaulay, G. J., Coyette, J. P., & Cremers, L. (1998). Three-dimensional wave-envelope elements of variable order for acoustic radiation and scattering. Part I. Formulation in the frequency domain. The Journal of the Acoustical Society of America, 103(1), 49-63.〕〔Astley, R. J., Coyette, J. P. (2001). The performance of spheroidal infinite elements. Int. J. Numer. Methods Engrg. 52 (12) 1379–1396.〕〔Astley, R. J., & Coyette, J. P. (2001). Conditioning of infinite element schemes for wave problems. Communications in Numerical Methods in Engineering, 17(1), 31-41.〕〔Coyette, J. P., & Van den Nieuwenhof, B. (2000). A conjugated infinite element method for half-space acoustic problems. The Journal of the Acoustical Society of America, 108(4), 1464-1473.〕〔Van den Nieuwenhof, B., & Coyette, J. P. (2001). Treatment of frequency-dependent admittance boundary conditions in transient acoustic finite/infinite-element models. The Journal of the Acoustical Society of America, 110(4), 1743-1751.〕
Early developments were funded by an industrial consortium and the first commercial release was made broadly available in 2002, after the three-years exclusivity period given to the members of the consortium ended.
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