<s>
ACTRAN	B-Application
(	O
acronym	O
of	O
ACoustic	O
TRANsmission	O
,	O
also	O
known	O
as	O
the	O
Acoustic	O
NASTRAN	B-Algorithm
)	O
is	O
a	O
finite	O
element-based	O
computer	O
aided	O
engineering	O
software	O
modeling	O
the	O
acoustic	O
behavior	O
of	O
mechanical	O
systems	O
and	O
parts	O
.	O
</s>
<s>
Actran	B-Application
is	O
being	O
developed	O
by	O
Free	O
Field	O
Technologies	O
,	O
a	O
Belgian	O
software	O
company	O
founded	O
in	O
1998	O
by	O
Jean-Pierre	O
Coyette	O
and	O
Jean-Louis	O
Migeot	O
.	O
</s>
<s>
Free	O
Field	O
Technologies	O
is	O
a	O
wholly	O
owned	O
subsidiary	O
of	O
the	O
MSC	B-Application
Software	I-Application
Corporation	O
since	O
2011	O
.	O
</s>
<s>
Free	O
Field	O
Technologies	O
and	O
MSC	B-Application
Software	I-Application
are	O
part	O
of	O
Hexagon	O
AB	O
since	O
2017	O
.	O
</s>
<s>
The	O
development	O
of	O
Actran	B-Application
started	O
in	O
1998	O
when	O
Jean-Pierre	O
Coyette	O
,	O
now	O
professor	O
of	O
the	O
Louvain	O
School	O
of	O
Engineering	O
–	O
Université	O
catholique	O
de	O
Louvain	O
,	O
and	O
Jean-Louis	O
Migeot	O
,	O
now	O
professor	O
at	O
the	O
Université	O
Libre	O
de	O
Bruxelles	O
and	O
past-president	O
of	O
the	O
Royal	O
Academy	O
of	O
Science	O
,	O
Letters	O
and	O
Fine	O
Arts	O
of	O
Belgium	O
-	O
Académie	O
royale	O
des	O
sciences	O
,	O
des	O
lettres	O
et	O
des	O
beaux-arts	O
de	O
Belgique	O
,	O
cofounded	O
the	O
Free	O
Field	O
Technologies	O
SA	O
software	O
company	O
.	O
</s>
<s>
The	O
original	O
idea	O
was	O
to	O
develop	O
a	O
finite	O
element-based	O
simulation	O
tool	O
for	O
vibro-acoustic	O
applications	O
able	O
to	O
overcome	O
the	O
limitations	O
of	O
the	O
then	O
dominant	O
Boundary	B-Algorithm
Element	I-Algorithm
Method	I-Algorithm
.	O
</s>
<s>
The	O
use	O
of	O
finite	B-Application
elements	I-Application
enabled	O
the	O
simulation	O
of	O
complex	O
noise	O
sources	O
,	O
the	O
combination	O
of	O
multiple	O
materials	O
in	O
the	O
same	O
model	O
and	O
the	O
handling	O
of	O
multi-million	O
degrees-of-freedom	O
models	O
.	O
</s>
<s>
The	O
initial	O
target	O
application	O
was	O
the	O
prediction	O
of	O
the	O
acoustic	O
transmission	O
through	O
complex	O
partitions	O
(	O
hence	O
the	O
name	O
ACTRAN	B-Application
:	O
ACoustic	O
TRANsmission	O
)	O
.	O
</s>
<s>
A	O
central	O
feature	O
of	O
Actran	B-Application
was	O
the	O
use	O
of	O
Infinite	O
Elements	O
(	O
IE	O
)	O
as	O
an	O
alternative	O
to	O
BEM	B-Algorithm
for	O
modelling	O
non-reflecting	O
boundary	O
conditions	O
and	O
calculating	O
the	O
far	O
field	O
.	O
</s>
<s>
Actran	B-Application
uses	O
conjugated	O
infinite	O
elements	O
,	O
an	O
extension	O
of	O
the	O
wave	O
envelope	O
technique	O
.	O
</s>
<s>
Actran	B-Application
is	O
written	O
in	O
the	O
Python	B-Language
and	O
C++	B-Language
languages	I-Language
and	O
is	O
compatible	O
with	O
both	O
Linux	B-Application
and	O
Windows	O
operating	O
systems	O
.	O
</s>
<s>
The	O
Actran	B-Application
software	O
is	O
currently	O
divided	O
and	O
licensed	O
into	O
different	O
modules	O
depending	O
on	O
the	O
target	O
application	O
and	O
the	O
physics	O
involved	O
:	O
</s>
<s>
Actran	B-Application
Acoustics	O
:	O
basic	O
module	O
for	O
acoustic	O
radiation	O
analysis	O
and	O
weakly	O
coupled	O
vibro-acoustic	O
simulations	O
;	O
typical	O
applications	O
are	O
:	O
noise	O
radiation	O
from	O
powertrains	O
,	O
noise	O
transmission	O
through	O
mufflers	O
and	O
silencers	O
.	O
</s>
<s>
Actran	B-Application
VibroAcoustics	O
:	O
module	O
dedicated	O
to	O
strongly	O
coupled	O
vibro-acoustic	O
simulations	O
;	O
typical	O
applications	O
are	O
:	O
sound	O
transmission	O
through	O
structures	O
(	O
walls	O
,	O
windows	O
,	O
etc	O
.	O
</s>
<s>
Actran	B-Application
AeroAcoustics	O
:	O
module	O
dedicated	O
to	O
the	O
computational	O
aeroacoustics	O
;	O
typical	O
applications	O
are	O
HVAC	O
ducts	O
,	O
centrifugal	O
and	O
axial	O
fans	O
,	O
side	O
window	O
noise	O
.	O
</s>
<s>
Actran	B-Application
for	O
Trimmed	O
bodies	O
:	O
module	O
dedicated	O
to	O
trimmed	O
body	O
analyses	O
;	O
typical	O
applications	O
are	O
car	O
cabins	O
and	O
aircraft	O
fuselages	O
;	O
</s>
<s>
Actran	B-Application
SEA	O
:	O
module	O
dedicated	O
to	O
SEA	O
analyses	O
;	O
typical	O
applications	O
are	O
transportation	O
vehicles	O
studies	O
at	O
mid	O
-	O
and	O
high-frequencies	O
;	O
</s>
<s>
Actran	B-Application
TM	O
:	O
module	O
dedicated	O
to	O
turbomachinery	O
noise	O
;	O
typical	O
applications	O
are	O
turbofan	O
engine	O
inlets	O
;	O
</s>
<s>
Actran	B-Application
DGM	O
:	O
module	O
solving	O
the	O
Linearized	O
Euler	O
Equations	O
.	O
</s>
<s>
This	O
module	O
is	O
a	O
time	O
domain	O
explicit	O
solver	O
and	O
the	O
numerical	O
scheme	O
is	O
the	O
Discontinuous	B-Algorithm
Galerkin	I-Algorithm
Method	I-Algorithm
(	O
DGM	O
)	O
;	O
typical	O
applications	O
are	O
turbofan	O
engine	O
by-pass	O
exhaust	O
ducts	O
and	O
turbine	O
exhausts	O
ducts	O
.	O
</s>
<s>
Actran	B-Application
VI	O
:	O
user	O
interface	O
common	O
to	O
all	O
modules	O
.	O
</s>
<s>
It	O
is	O
used	O
to	O
pre-process	O
Actran	B-Application
modules	O
including	O
generating	O
and	O
modifying	O
acoustic	O
meshes	O
and	O
to	O
post-process	O
the	O
results	O
.	O
</s>
<s>
Actran	B-Application
Student	O
Edition	O
:	O
software	O
limited	O
release	O
freely	O
available	O
to	O
students	O
.	O
</s>
<s>
Actran	B-Application
is	O
integrated	O
with	O
MSC	O
Nastran	B-Algorithm
for	O
vibro-acoustic	O
simulations	O
.	O
</s>
<s>
Either	O
a	O
MSC	O
Nastran	B-Algorithm
model	O
is	O
translated	O
into	O
an	O
Actran	B-Application
input	O
file	O
,	O
or	O
structural	O
modes	O
are	O
used	O
as	O
part	O
of	O
an	O
Actran	B-Application
analysis	O
.	O
</s>
<s>
Actran	B-Application
is	O
coupled	O
with	O
other	O
MSC	B-Application
Software	I-Application
time	O
domain	O
solvers	O
:	O
</s>
<s>
MSC	B-Application
Adams	I-Application
for	O
moving	O
mechanisms	O
and	O
impact	O
noise	O
studies	O
;	O
</s>
<s>
Dytran	O
and	O
MSC	O
Nastran	B-Algorithm
SOL700	O
for	O
sloshing	O
noise	O
analysis	O
;	O
</s>
<s>
MSC	B-Algorithm
Marc	I-Algorithm
for	O
acoustic	O
radiation	O
analysis	O
from	O
objects	O
subject	O
to	O
large	O
deformations	O
and	O
strain	O
.	O
</s>
