background image
Code_Aster
®
Version
7.4
Titrate:
Operator
DYNA_SPEC_MODAL
Date:
27/01/05
Author (S):
A. ADOBES
Key
:
U4.53.23-E
Page
:
1/4
Instruction manual
U4.5- booklet: Methods of resolution
HT-66/05/004/A
Organization (S):
EDF-R & D/MFTT















Instruction manual
U4.5- booklet: Methods of resolution
Document: U4.53.23



Operator
DYNA_SPEC_MODAL

1 Goal
To calculate the response by modal recombination of a linear structure to a random excitation. This
excitation is defined in the form of interspectres of power of modal efforts. The answer is established
in the form of interspectres of power of generalized displacements.
Each matrix interspectrale is associated a modal base for which the answer is calculated.
The produced result is a concept of the tabl_intsp type.
background image
Code_Aster
®
Version
7.4
Titrate:
Operator
DYNA_SPEC_MODAL
Date:
27/01/05
Author (S):
A. ADOBES
Key
:
U4.53.23-E
Page
:
2/4
Instruction manual
U4.5- booklet: Methods of resolution
HT-66/05/004/A
2
Syntax
tinsp [tabl_intsp] = DYNA_SPEC_MODAL
(


BASE_ELAS_FLUI
=
bef
,
[melasflu]


EXCIT = _F
(
INTE_SPEC_GENE = exc
,
[tabl_intsp]
)


OPTION
=
/
“ALL”
[DEFECT]
/
“DIAG”
,


TITRATE
=
titrate
, [TXM]

);
background image
Code_Aster
®
Version
7.4
Titrate:
Operator
DYNA_SPEC_MODAL
Date:
27/01/05
Author (S):
A. ADOBES
Key
:
U4.53.23-E
Page
:
3/4
Instruction manual
U4.5- booklet: Methods of resolution
HT-66/05/004/A
3
Operands
3.1 Operand
BASE_ELAS_FLUI
BASE_ELAS_FLUI = bef
Concept of the type
melasflu
, a whole of modal bases associated different defines
rates of flow of the fluid.

3.2 Key word
EXCIT
EXCIT
Key word factor which defines the excitation.
INTE_SPEC_GENE = exc
Concept of the type
tabl_intsp
, the interspectres excitation (modal efforts) defines.

3.3 Operand
OPTION
OPTION = “ALL”
or
“DIAG”
Argument of the text type which indicates if one wants to calculate all the interspectres
“ALL”
or them
autospectres only
“DIAG”
. By defect one calculates all the interspectres.

3.4 Operand
TITRATE
TITRATE = title
Argument of the text type defining the title attached to the concept tabl_intsp at exit.

background image
Code_Aster
®
Version
7.4
Titrate:
Operator
DYNA_SPEC_MODAL
Date:
27/01/05
Author (S):
A. ADOBES
Key
:
U4.53.23-E
Page
:
4/4
Instruction manual
U4.5- booklet: Methods of resolution
HT-66/05/004/A


























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