Code_Aster ®
Version
7.4
Titrate:
Operator DYNA_SPEC_MODAL


Date:
27/01/05
Author (S):
A. Key ADOBES
:
U4.53.23-E Page
: 1/4

Organization (S): EDF-R & D/MFTT
Handbook of Utilization
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.

Handbook of Utilization
U4.5- booklet: Methods of resolution
HT-66/05/004/A

Code_Aster ®
Version
7.4
Titrate:
Operator DYNA_SPEC_MODAL


Date:
27/01/05
Author (S):
A. Key ADOBES
:
U4.53.23-E Page
: 2/4

2
Syntax

tinsp [tabl_intsp] = DYNA_SPEC_MODAL
(

BASE_ELAS_FLUI
=
bef
,
[melasflu]

EXCIT = _F
(

INTE_SPEC_GENE = exc

,
[tabl_intsp]




)

OPTION
=
/
“TOUT”
[DEFAUT]
/
“DIAG”
,

TITER
=
titrate
, [TXM]







);

Handbook of Utilization
U4.5- booklet: Methods of resolution
HT-66/05/004/A

Code_Aster ®
Version
7.4
Titrate:
Operator DYNA_SPEC_MODAL


Date:
27/01/05
Author (S):
A. Key ADOBES
:
U4.53.23-E Page
: 3/4

3
Operands

3.1 Operand
BASE_ELAS_FLUI

BASE_ELAS_FLUI = bef

Concept of the melasflu type, defines a whole of modal bases associated different
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 tabl_intsp type, defines the interspectres excitation (modal efforts).

3.3 Operand
OPTION


OPTION = “TOUT” or “DIAG”

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

3.4 Operand
TITER


TITER = title

Argument of the text type defining the title attached to the concept tabl_intsp at output.

Handbook of Utilization
U4.5- booklet: Methods of resolution
HT-66/05/004/A

Code_Aster ®
Version
7.4
Titrate:
Operator DYNA_SPEC_MODAL


Date:
27/01/05
Author (S):
A. Key ADOBES
:
U4.53.23-E Page
: 4/4

Intentionally white left page.
Handbook of Utilization
U4.5- booklet: Methods of resolution
HT-66/05/004/A

Outline document