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Code_Aster
®
Version
8.2
Titrate:
Operator
DEFI_BASE_MODALE
Date:
31/01/06
Author (S):
O. NICOLAS, E. BOYERE
Key
:
U4.64.02-H1
Page:
1/6
Instruction manual
U4.6- booklet: Elementary matrices/Vectors and assembly
HT-62/06/004/A
Organization (S):
EDF-R & D/AMA














Instruction manual
U4.6- booklet: Elementary matrices/Vectors and assembly
Document: U4.64.02



Operator
DEFI_BASE_MODALE








1 Goal
To define the base of a dynamic under-structuring or a modal recombination.
The modal base obtained by this operator is of the type:
“CONVENTIONAL”
if the modal base is
composed of dynamic clean modes and the static deformations calculated by the operator with
to start from a concept of the type
interf_dyna_clas
product by
DEFI_INTERF_DYNA
[U4.64.01].
The option
DIAG_MASS
allows to recompute a classification for the static modes of such kind
that the matrix of mass is diagonal. the base is of
RITZ
in the other cases.
Product a concept of the base_modale type.
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Code_Aster
®
Version
8.2
Titrate:
Operator
DEFI_BASE_MODALE
Date:
31/01/06
Author (S):
O. NICOLAS, E. BOYERE
Key
:
U4.64.02-H1
Page:
2/6
Instruction manual
U4.6- booklet: Elementary matrices/Vectors and assembly
HT-62/06/004/A
2 Syntax

bamo [base_modale] = DEFI_BASE_MODALE
(
/
CONVENTIONAL =
_F (
INTERF_DYNA=
intdyn, [interf_dyna_clas]
MODE_MECA = modes,
[mode_meca]
NMAX_MODE =/nbmode,
[I]
/
10,
[DEFECT]
),

/
RITZ =
_F (
|
MODE_MECA = modes,
[l_mode_meca]
|
MODE_STAT = modesta,
[mode_stat_ *]
|
MULT_ELAS = multelas,
[mult_elas]
| BASE_MODALE=
bamo,
[base_modale]
NMAX_MODE =/nbmode,
[I]
/
999,
[DEFECT]
)
/
DIAG_MASS =
_F (
|
MODE_MECA = modes,
[l_mode_meca]
|
MODE_STAT = modesta,
[mode_stat_ *]
),
/
ORTHO_BASE =
_F (
BASE = modes,
[l_mode_meca,
base_modale
]
STAMP = matrix,
[matr_asse_ *]
),

INTERF_DYNA
=
intdyn, [interf_dyna_clas]

NUME_REF
=
numddl, [nume_ddl]

TITRATE
=
titrate,
[l_Kn]

INFORMATION
=
/
1,
[DEFECT]
/
2,
)


background image
Code_Aster
®
Version
8.2
Titrate:
Operator
DEFI_BASE_MODALE
Date:
31/01/06
Author (S):
O. NICOLAS, E. BOYERE
Key
:
U4.64.02-H1
Page:
3/6
Instruction manual
U4.6- booklet: Elementary matrices/Vectors and assembly
HT-62/06/004/A
3 Operands
3.1 Word
key
CONVENTIONAL
/
CONVENTIONAL
Key word factor for the definition of a modal base of type
“CONVENTIONAL”
.
3.1.1 Operand
INTERF_DYNA
INTERF_DYNA = intdyn
Name of the concept of the type
interf_dyna_clas
product by
DEFI_INTERF_DYNA
[U4.64.01].
The operator calculates the static deformations corresponding to the various defined interfaces,
while being based on the classification used for the calculation of the clean modes.
3.1.2 Operands
MODE_MECA/NMAX_MODE
MODE_MECA = modes
Name of the concept of the type
mode_meca
containing the clean modes of the structure.
NMAX_MODE = nbmode
A number of modes suitable to use in the modal base. Clean modes corresponding
with
nbmode
the lowest frequencies are taken into account.
3.2 Word
key
RITZ
/RITZ
Key word factor allowing to build a modal base of substructure of the type
“RITZ”
.
They is made up starting from 2 occurrences of the key word
RITZ
.
3.2.1 Word
key
MODE_MECA
1
era
occurrence of the key word
RITZ
. Name of the concept of the type
mode_meca
containing the clean modes
dynamic of the treated substructure. One can give a list of
mode_meca
obtained each one by
restitution of one
mode_gene
on a different substructure.
3.2.2 Word
key
MODE_STAT
2
ème
occurrence of the key word
RITZ
. Name of the concept of the type
mode_stat_ *
product by the operator
MODE_STATIQUE
[U4.52.14] which contains the static modes calculated with the interface of
substructure.
3.2.3 Word
key
MULT_ELAS
Name of the concept of the type
mult_elas
product by the operator
MACRO_ELAS_MULT
[U4.51.02] which
contains the static modes given by this operator.
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Code_Aster
®
Version
8.2
Titrate:
Operator
DEFI_BASE_MODALE
Date:
31/01/06
Author (S):
O. NICOLAS, E. BOYERE
Key
:
U4.64.02-H1
Page:
4/6
Instruction manual
U4.6- booklet: Elementary matrices/Vectors and assembly
HT-62/06/004/A
3.2.4 Word
key
BASE_MODALE
Name of concept of the base_modale type produces by a preceding call of the operator of
DEFI_BASE_MODALE
[U4.64.02]. It can have entered only at the time of the first occurrence of the key word
RITZ
. Second occurrence of the key word
RITZ
will contain then obligatorily the key word
MODE_STAT
. The name of concept base_modale result of the operator can be different from the aforementioned
or identical (it is then réentrant).
3.2.5
NMAX_MODE
A number of modes to be retained in the dynamic modes (or statics) given by one of the key words
precedents under the occurrence of key word RITZ.
3.2.6 Operand
INTERF_DYNA
Interface dynamic substructure (to be informed possibly and only if one uses
“RITZ”
).
3.2.7 Operand
NUME_REF
Classification of reference on which all fields of displacement (dynamic modes and
statics) constituting the base of
“RITZ”
will be reordered.

3.3 Word
key
DIAG_MASS
/DIAG_MASS
Key word allowing to recompute the static modes by eliminating the dynamic contribution
and while proceeding to a orthogonalization of Graam-Schmidt.
3.3.1 Word
key
MODE_MECA
Name of the concept of the type
mode_meca
containing the dynamic clean modes of the substructure
treated.
3.3.2 Word
key
MODE_STAT
Name of the concept of the type
mode_stat_ *
product by the operator
MODE_STATIQUE
[U4.52.14] which
contains the static modes.

3.4 Word
key
ORTHO_BASE
/ORTHO_BASE
Key word allowing of réorthonormaliser the modes of a base while proceeding to one
orthogonalization of Graam-Schmidt.
3.4.1 Word
key
BASE
Name of the concept of the type
mode_meca or bases modal
containing dynamic clean modes.
3.4.2 Word
key
STAMP
Name of the concept of the type
matr_asse_ *
who contains will be taken into account for the scalar products
at the time of the reorthogonalisation.
3.5 Operand
TITRATE
TITRATE = title
Titrate concept created.
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Code_Aster
®
Version
8.2
Titrate:
Operator
DEFI_BASE_MODALE
Date:
31/01/06
Author (S):
O. NICOLAS, E. BOYERE
Key
:
U4.64.02-H1
Page:
5/6
Instruction manual
U4.6- booklet: Elementary matrices/Vectors and assembly
HT-62/06/004/A
3.6 Operand
INFORMATION
INFORMATION =
Level of the information provided in the file '
MESSAGE
':
1
no impression,
2
writing of the general information (concepts upstream, basic standard),


4 Example
An example of use of the control is given in the documentation of the operator
DEFI_SQUELETTE
[U4.24.01].

background image
Code_Aster
®
Version
8.2
Titrate:
Operator
DEFI_BASE_MODALE
Date:
31/01/06
Author (S):
O. NICOLAS, E. BOYERE
Key
:
U4.64.02-H1
Page:
6/6
Instruction manual
U4.6- booklet: Elementary matrices/Vectors and assembly
HT-62/06/004/A


























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