Code_Aster ®
Version
7.4
Titrate:
Operator MODI_BASE_MODALE
Date:
19/01/05
Author (S):
A. Key ADOBES
:
U4.66.21-E Page
: 1/4
Organization (S): EDF-R & D/MFTT
Handbook of Utilization
U4.6- booklet: Elementary matrices/Vecteurs and assembly
Document: U4.66.21
Operator MODI_BASE_MODALE
1 Goal
To define the modal base of a structure under flow. This base is obtained after a calculation of
coupling fluid-rubber band carried out using operator CALC_FLUI_STRU [U4.66.02]. The concept
product is of mode_meca type
Handbook of Utilization
U4.6- booklet: Elementary matrices/Vecteurs and assembly
HT-66/05/004/A
Code_Aster ®
Version
7.4
Titrate:
Operator MODI_BASE_MODALE
Date:
19/01/05
Author (S):
A. Key ADOBES
:
U4.66.21-E Page
: 2/4
2
Syntax
mode [mode_meca] = MODI_BASE_MODALE (
BASE =
mode
,
[mode_meca]
BASE_ELAS_FLUI
=
bef
,
[melasflu]
NUME_VITE_FLUI
=
numv
,
[I]
NUME_ORDRE = l_nuor
,
[l_I]
/AMOR_REDUIT
=
l_amor
,
[l_R]
/
AMOR_UNIF
=
amor
,
[R]
INFORMATION =/1 [DEFECT]
/2, [I]
TITER
=
titrate
, [TXM]
)
Handbook of Utilization
U4.6- booklet: Elementary matrices/Vecteurs and assembly
HT-66/05/004/A
Code_Aster ®
Version
7.4
Titrate:
Operator MODI_BASE_MODALE
Date:
19/01/05
Author (S):
A. Key ADOBES
:
U4.66.21-E Page
: 3/4
3 Operands
BASE = mode
Concept of the type [mode_meca] which defines the modal characteristics before taking into account of
coupling fluid-rubber band. According to the choice of the user, the operator modifies this concept of input
or creates a new concept of the type [mode_meca].
BASE_ELAS_FLUI = bef
Concept of the type [melasflu] which defines the new characteristics of the modes taken into account
for the coupling fluid-rubber band, various rates of flow.
NUME_VITE_FLUI = numv
Allows to point on the characteristics of the modes taken into account for the coupling
fluidelastic, for a rate of flow given.
NUME_ORDRE = l_nuor
If one modifies the concept of input of the type [mode_meca]: list sequence numbers of the modes
nondisturbed to which one wishes to affect a reduced damping.
If one creates a new concept of the type [mode_meca] at output: list sequence numbers of
nondisturbed modes which are actually retained to rebuild the modal base.
possibility of affecting a damping reduced to these modes is maintained, while resorting to
operands AMOR_REDUIT or AMOR_UNIF below.
Note:
By defect, one selects all the modes which were not taken into account for the coupling
fluid-rubber band. Not to give in this list of the sequence numbers corresponding to
coupled modes.
The constitution of [mode_meca] the result according to the choices for the operands
NUME_ORDRE, AMOR_REDUIT and AMOR_UNIF are specified in paragraph [§4].
/AMOR_REDUIT = l_amor
List affected reduced depreciation with the nondisturbed modes.
/
AMOR_UNIF = amor
Affected reduced damping identically with the nondisturbed modes.
INFO = 1 or 2
Inactive operand. To obtain the impression of the results, the command should be used
IMPR_RESU [U4.91.01].
TITER = title
Argument of the type text [TXM] defining the title attached to the concept [mode_meca] at output.
Handbook of Utilization
U4.6- booklet: Elementary matrices/Vecteurs and assembly
HT-66/05/004/A
Code_Aster ®
Version
7.4
Titrate:
Operator MODI_BASE_MODALE
Date:
19/01/05
Author (S):
A. Key ADOBES
:
U4.66.21-E Page
: 4/4
4
Specified for the use: contents of the concept
[mode_meca] result
MODIFICATION OF the CONCEPT Of INPUT BY MODI_BASE_MODALE
&mode
NUME_ORDRE
Ncf modes
Na modes selected
disturbed by
yes
not
informed?
coupling
+
AMOR_REDUIT
One affects to
NT-Ncf modes
AM
OR_REDUIT
or
Na modes
nondisturbed
or
with assignment
AMOR_UNIF
not
selected
AMOR_UNIF
and with the others
of damping
not
informed?
NT (Ncf+Na)
informed?
no one
modes
yes
yes
nondisturbed
a value
of damping
tiny room null
AMOR_UNIF
AMOR_REDUIT
AMOR_REDUIT
AMOR_UNIF
One affects to
A number of elements
NT-Ncf modes
Error
A many elements One affect to
in the list equal not
not
nondisturbed
fatal
in the list equal
Na first modes
with NT-Ncf?
the value
with Na?
nondisturbed
of damping
selected
yes
yes
tiny room definite
the value
of damping
Assignment
Assignment
tiny room definite
values
values
and a value
&mode
of damping
of damping
null with the others
&mode
with the modes
defined in
modes not
Ncf modes
Na first disturbed modes
nondisturbed
disturbed by
Ncf modes
nondisturbed
coupling
disturbed by
selected
+
coupling
and of a value
Na modes
+
of damping
nondisturbed
NT-Ncf modes
null with the others
with assignment
nondisturbed
modes not
of damping
with assignment
disturbed
+
of damping
NT (Ncf+Na) modes
nondisturbed with
null damping
CREATION Of a NEW CONCEPT BY MODI_BASE_MODALE
NUME_ORDRE
Na modes selected
yes
not
informed?
modecf
One affects to
AMOR_REDUIT
AMOR_REDUIT
Na modes
or
or
Ncf modes
AMOR_UNIF
not
nondisturbed
AMOR_UNIF
disturbed by
selected
not
coupling
informed?
a value
informed?
of damping
yes
yes
tiny room null
AMOR_UNIF
AMOR_REDUIT
AMOR_REDUIT
AMOR_UNIF
One affects to
A number of elements
NT-Ncf modes
Error
A number of elements
One affects to
in the list equal not
not
nondisturbed
fatal
in the list equal
Na modes
with NT-Ncf?
the value
with Na?
nondisturbed
of damping
selected
yes
yes
tiny room definite
the value
of damping
Assignment
Assignment
tiny room definite
values
values
of damping
of damping
modecf
with the modes
with the modes
nondisturbed
nondisturbed
modecf
Ncf modes
selected
disturbed by
Ncf modes
coupling
disturbed by
+
coupling
NT-Ncf modes
+
nondisturbed
Na modes
with assignment
nondisturbed
of damping
with assignment
of damping
Handbook of Utilization
U4.6- booklet: Elementary matrices/Vecteurs and assembly
HT-66/05/004/A
Outline document