background image
Code_Aster
®
Version
7.4
Titrate:
Operator DEFI_
PARA_SENSI
Date:
08/02/05
Author (S):
G. NICOLAS
Key
:
U4.31.06-B
Page
:
1/4
Instruction manual
U4.3- booklet: Function
HT-66/05/004/A
Organization (S):
EDF-R & D/SINETICS














Instruction manual
U4.3- booklet: Function
Document: U4.31.06



Operator
DEFI_PARA_SENSI








1 Goal
To define the value of a significant parameter.
This operator allows to declare a parameter of calculation like which can be useful in calculations of
sensitivity. That results in:
·
a real numerical value is assigned to the size created,
·
the size created is of type para_sensi, sub-type of the function type.
The size is used like any function; for example in the definition of materials or
of loading.
To obtain the derivative of a result compared to the size, the sequence is inserted
SENSITIVITY = (size) in the control. One will refer to [U4.50.01] for the details and
with [U2.08.02] for a note of use.
background image
Code_Aster
®
Version
7.4
Titrate:
Operator DEFI_
PARA_SENSI
Date:
08/02/05
Author (S):
G. NICOLAS
Key
:
U4.31.06-B
Page
:
2/4
Instruction manual
U4.3- booklet: Function
HT-66/05/004/A
2 Syntax

F [para_sensi] = DEFI_PARA_SENSI
(
NOM_RESU
=/
“TOUTRESU” [DEFECT]
/
NR
[K8]
VALE
=
v
[R]
TITRATE
= [l_Kn]
)
background image
Code_Aster
®
Version
7.4
Titrate:
Operator DEFI_
PARA_SENSI
Date:
08/02/05
Author (S):
G. NICOLAS
Key
:
U4.31.06-B
Page
:
3/4
Instruction manual
U4.3- booklet: Function
HT-66/05/004/A
3 Operands
3.1 Operand
NOM_RESU
NOM_RESU = NR
Indicate the name of the result, the significant parameter thus created is a function whose value is it
name
NR
(8 characters).
In fact, this operand is not useful systematically for checks of coherence, in
execution of the code. These checks of coherence are made by the control
CALC_FONCTION
.

3.2 Operand
VALE
VALE = v
Value of the constant (a real number).

3.3 Operand
TITRATE
TITRATE = Ti
Titrate attached to the concept produced by this operator [U4.03.01].


4 Examples
Young = DEFI_PARA_SENSI (
VALE = 2.1E11
)
The Young size is a constant being worth 2.1E11. One then uses it in the definition of one
material:
naked = DEFI_CONSTANTE (VALE = 0.3)
chechmate = DEFI_MATERIAU (ELAS_FO = _F (E = Young, NAKED = naked
))
One will calculate the field of displacement and his derivative compared to this Young modulus:
resu = MECA_STATIQUE (…
SENSITIVITY
=
(Young),
)
background image
Code_Aster
®
Version
7.4
Titrate:
Operator DEFI_
PARA_SENSI
Date:
08/02/05
Author (S):
G. NICOLAS
Key
:
U4.31.06-B
Page
:
4/4
Instruction manual
U4.3- booklet: Function
HT-66/05/004/A
























Intentionally white left page.