Code_Aster
®
Version
7.4
Titrate:
Operator
MODI_BASE_MODALE
Date:
19/01/05
Author (S):
A. ADOBES
Key
:
U4.66.21-E
Page
:
1/4
Instruction manual
U4.6- booklet: Elementary matrices/Vectors and assembly
HT-66/05/004/A
Organization (S):
EDF-R & D/MFTT
Instruction manual
U4.6- booklet: Elementary matrices/Vectors 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 type
mode_meca
Code_Aster
®
Version
7.4
Titrate:
Operator
MODI_BASE_MODALE
Date:
19/01/05
Author (S):
A. ADOBES
Key
:
U4.66.21-E
Page
:
3/4
Instruction manual
U4.6- booklet: Elementary matrices/Vectors and assembly
HT-66/05/004/A
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 exit: 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.
INFORMATION = 1
or
2
Inactive operand. To obtain the impression of the results, the control should be used
IMPR_RESU [U4.91.01].
TITRATE = title
Argument of the text type
[TXM]
defining the title attached to the concept [mode_meca] at exit.
Code_Aster
®
Version
7.4
Titrate:
Operator
MODI_BASE_MODALE
Date:
19/01/05
Author (S):
A. ADOBES
Key
:
U4.66.21-E
Page
:
4/4
Instruction manual
U4.6- booklet: Elementary matrices/Vectors and assembly
HT-66/05/004/A
4
Specified for the use: contents of the concept
[mode_meca]
result
not
NUME_ORDRE
informed?
Na modes selected
yes
AMOR_REDUIT
or
AMOR_UNIF
informed?
not
yes
AMOR_UNIF
One affects to
NT-Ncf modes
nondisturbed
the value
of damping
tiny room definite
&mode
Ncf modes
disturbed by
coupling
+
NT-Ncf modes
nondisturbed
with assignment
of damping
A number of elements
in the list equal
with NT-Ncf?
Assignment
values
of damping
with the modes
nondisturbed
yes
not
Error
fatal
AMOR_UNIF
One affects to
Na first modes
nondisturbed
selected
the value
of damping
tiny room definite
and a value
null with the others
modes not
disturbed
not
One affects to
Na modes
selected
and with the others
NT (Ncf+Na)
modes
nondisturbed
a value
of damping
tiny room null
not
yes
A number of elements
in the list equal
with Na?
Assignment
values
of damping
defined in
Na first modes
nondisturbed
selected
and of a value
of damping
null with the others
modes not
disturbed
or
AMOR_UNIF
informed?
yes
&mode
Ncf modes
disturbed by
coupling
+
Na modes
nondisturbed
with assignment
of damping
+
NT (Ncf+Na) modes
nondisturbed with
null damping
AMENDMENT OF the CONCEPT Of INPUT BY
MODI_BASE_MODALE
&mode
Ncf modes
disturbed by
coupling
+
NT-Ncf modes
nondisturbed
with assignment
of damping
no one
not
modecf
Ncf modes
disturbed by
coupling
NUME_ORDRE
informed?
Na modes selected
yes
or
AMOR_UNIF
informed?
not
yes
AMOR_UNIF
One affects to
NT-Ncf modes
nondisturbed
the value
of damping
tiny room definite
modecf
Ncf modes
disturbed by
coupling
+
NT-Ncf modes
nondisturbed
with assignment
of damping
A number of elements
in the list equal
with NT-Ncf?
Assignment
values
of damping
with the modes
nondisturbed
yes
not
Error
fatal
AMOR_UNIF
One affects to
Na modes
nondisturbed
selected
the value
of damping
tiny room definite
not
One affects to
Na modes
nondisturbed
selected
a value
of damping
tiny room null
not
yes
A number of elements
in the list equal
with Na?
Assignment
values
of damping
with the modes
nondisturbed
selected
or
AMOR_UNIF
informed?
yes
modecf
Ncf modes
disturbed by
coupling
+
Na modes
nondisturbed
with assignment
of damping
CREATION Of a NEW CONCEPT BY
MODI_BASE_MODALE
AMOR_REDUIT
AMOR_REDUIT
AMOR_REDUIT
AMOR_REDUIT
AMOR_REDUIT
AMOR_REDUIT
AMOR_REDUIT