Code_Aster
®
Version
7.4
Titrate:
Operator PROJ_SPEC_BASE
Date:
27/01/05
Author (S):
A. ADOBES
Key
:
U4.63.14-E
Page
:
1/6
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: U4.63.14
Operator
PROJ_SPEC_BASE
1 Goal
To project one or more spectra of turbulence on one (or several) bases (S) modal (S). Spectra
are defined by the operator
DEFI_SPEC_TURB
[U4.44.31]. (Or them) bases (S) modal (S) can or
(can) to be defined by:
·
a concept of the type
melasflu
product by the operator
CALC_FLUI_STRU
[U4.66.02],
·
a concept of the type
mode_meca
product by the operator
MODE_ITER_INV
[U4.52.04] or
MODE_ITER_SIMULT
[U4.52.03],
·
a list of concepts of the type
cham_no_depl_r
corresponding to the deformations.
Allows to calculate for each definite modal base a matrix interspectrale of excitations
generalized. An option makes it possible if necessary to calculate only the autospectres.
The produced concept is of type
tabl_intsp
.
Code_Aster
®
Version
7.4
Titrate:
Operator PROJ_SPEC_BASE
Date:
27/01/05
Author (S):
A. ADOBES
Key
:
U4.63.14-E
Page
:
2/6
Instruction manual
U4.6- booklet: Elementary matrices/Vectors and assembly
HT-66/05/004/A
2 Syntax
tinsp [tabl_intsp]
=
PROJ_SPEC_BASE
(
SPEC_TURB
=
l_spec
,
[l_specter]
/BASE_ELAS_FLUI = baseflui
,
[melasflu]
/
MODE_MECA
=
basemeca
,
[mode_meca]
/
CHAM_NO =
l_cham
,
[l_cham_no_DEPL_R]
MODELE_INTERFACE
=
model
,
[model]
GROUP_MA
=
grma
,
[gr_maille]
VECT_X
=
l_cmpx
,
[l_R]
VECT_Y
=
l_cmpy
,
[l_R]
ORIG_AXE
=
l_coor
,
[l_R]
FREQ_INIT
=
fi
, [R]
FREQ_FIN
=
FF,
[R]
NB_POIN
=
Np,
[I]
OPTION
=
/
“ALL”
[DEFECT]
/
“DIAG”
,
TITRATE
=
titrate
, [TXM]
);
Code_Aster
®
Version
7.4
Titrate:
Operator PROJ_SPEC_BASE
Date:
27/01/05
Author (S):
A. ADOBES
Key
:
U4.63.14-E
Page
:
3/6
Instruction manual
U4.6- booklet: Elementary matrices/Vectors and assembly
HT-66/05/004/A
3 Operands
3.1 Operand
SPEC_TURB
SPEC_TURB = l_spec
List concepts of the type
spectrum
products by the operator
DEFI_SPEC_TURB
[U4.44.31]
defining several spectra of turbulent excitation.
Note:
1) The operand
SPEC_TURB
the taking into account of several spectra of excitation allows
turbulent. The interspectres of generalized excitations are calculated for each one of
provided physical spectra then are added.
2) The spectra of turbulence of the type “length of correlation” apply only to
tubes of Steam Generator. It is possible to project several spectra of turbulence of the type
“length of correlation” simultaneously, but areas of excitation of each spectrum
from/to each other must be strictly disjoined. The areas on which
apply these excitations are defined for each spectrum, with the control
DEFI_SPEC_TURB
[U4.44.31].
3) The spectra of turbulence of the type “length of correlation” cannot be combined
with spectra of another type.
3.2 Operand
BASE_ELAS_FLUI
The operand
BASE_ELAS_FLUI
is employed when one wishes to carry out the projection of a spectrum
defined by one of the key words factors
SPEC_LONG_COR_n
,
SPEC_FONC_FORME
or
SPEC_EXCI_POINT
of the operator
DEFI_SPEC_TURB
[U4.44.31].
/BASE_ELAS_FLUI
=
baseflui
Concept of the type
melasflu
product by the operator
CALC_FLUI_STRU
[U4.66.02], which defines
one or a whole of modal bases on which or (which) the spectra are projected,
as well as the discretization of speed.
For each speed K, the operator calculates a matrix of interspectres of excitations
generalized
()
S
fifj K
.
The concept
melasflu
provides moreover the name of the concept
type_flui_stru
product in beginning
of study by the control
DEFI_FLUI_STRU
[U4.25.01]. The concept
type_flui_stru
contains all information characteristic of the studied configuration: one finds there between
others data necessary to the dimensionnalisation of the projected excitation.
3.3 Operands
MODE_MECA
or
CHAM_NO
Operands
MODE_MECA
or
CHAM_NO
are employed when one wishes to carry out projection
of a spectrum of pressure defined by one of the key words factors
SPEC_CORR_CONV_n
of the operator
DEFI_SPEC_TURB
[U4.44.31].
/
MODE_MECA
=
basemeca
Concept of the type
mode_meca
product by the operator
MODE_ITER_INV
[U4.52.04] or
MODE_ITER_SIMULT
[U4.52.03], which defines the modal base on which the spectra are
projected. This modal base was possibly calculated by taking account of an effect of
mass added fluid, by recourse to the operator
CALC_MATR_AJOU
[U4.66.01] or
MACRO_MATR_AJOU
[U4.66.11].
Code_Aster
®
Version
7.4
Titrate:
Operator PROJ_SPEC_BASE
Date:
27/01/05
Author (S):
A. ADOBES
Key
:
U4.63.14-E
Page
:
4/6
Instruction manual
U4.6- booklet: Elementary matrices/Vectors and assembly
HT-66/05/004/A
/
CHAM_NO
=
l_cham
List concepts of the type
cham_no_depl_r
, which defines the deformations of the base
modal on which the spectra are projected.
This manner of defining the modal base makes it possible to impose on the structure a particular type of
movement; a similar step is adopted in the operator
CALC_MATR_AJOU
[U4.66.01], where figure also the operand
CHAM_NO
.
Note:
The operator determines the matrix of mutual acceptance connecting the spectrum of pressure to
the matrix interspectrale of generalized excitations acting on the structure:
()
[
]
()
()
[
]
S
S
J
fifj
p
Aij
=
×
where
·
()
p
S
is the spectral concentration of power of pressure,
·
()
[
]
J
Aij
is the matrix of mutual acceptance,
·
()
[
]
S
fifj
is the matrix of the interspectres of generalized excitations.
The theoretical precise details are given in internal report HP-51/97/027/B.
3.4 Operand
MODELE_INTERFACE
The operand
MODELE_INTERFACE
is employed when one wishes to carry out the projection of a spectrum
of pressure defined by one of the key words factors
SPEC_CORR_CONV_n
of the operator
DEFI_SPEC_TURB
[U4.44.31], if the user made a calculation of mass added with
the operator
CALC_MATR_AJOU
[U4.66.01].
MODELE_INTERFACE
=
model
Concept of the type
model
product by the operator
AFFE_MODELE
[U4.41.01], defining the model
(thermics) of interface enters the structure and the fluid.
Note:
If a model of interface is defined, the calculation of the coefficients of acceptance
be carried out using this model, which characterizes the wet surface of the structure, while making
the assumption of a homogeneous turbulence on all the interface fluid-structure.
In the contrary case, the coefficients of acceptance are calculated on the structure, in condition
that the aforementioned is modelized in thin hulls of type
DKT
.
3.5 Operand
GROUP_MA
The operand
GROUP_MA
is employed when one wishes to carry out the projection of a spectrum of
pressure defined by one of the key words factors
SPEC_CORR_CONV_n
of the operator
DEFI_SPEC_TURB
[U4.44.31].
GROUP_MA
=
grma
Name of the group of meshs of the mesh corresponding to the interface fluid-structure if
a model of interface is defined (operand
MODELE_INTERFACE
above), or with the structure alone
in the contrary case.
Code_Aster
®
Version
7.4
Titrate:
Operator PROJ_SPEC_BASE
Date:
27/01/05
Author (S):
A. ADOBES
Key
:
U4.63.14-E
Page
:
5/6
Instruction manual
U4.6- booklet: Elementary matrices/Vectors and assembly
HT-66/05/004/A
3.6 Operand
VECT_X
The operand
VECT_X
is employed when one wishes to carry out the projection of a spectrum of pressure
defined by one of the key words factors
SPEC_CORR_CONV_n
of the operator
DEFI_SPEC_TURB
[U4.44.31], if correlations of
CORCOS
or of
AU_YANG
are used.
VECT_X
=
l_cmpx
List of three components of an unit vector
X
defining:
·
direction of the flow on the surface of the plane structure, in the case of one
correlation of
CORCOS
,
·
direction of the axis of revolution of the cylindrical structure of circular section, in
case of a correlation of
AU_YANG
.
(see diagrams hereafter)
3.7 Operand
VECT_Y
The operand
VECT_Y
is employed when one wishes to carry out the projection of a spectrum of pressure
defined by one of the key words factors
SPEC_CORR_CONV_n
of the operator
DEFI_SPEC_TURB
[U4.44.31], if the correlation of
CORCOS
is used.
VECT_Y
=
l_cmpy
List of the three components of an unit vector
y
defining the orthogonal direction in
direction of the flow on the surface of the plane structure (see diagrams hereafter).
3.8 Operand
ORIG_AXE
The operand
ORIG_AXE
is employed when one wishes to carry out the projection of a spectrum of
pressure defined by one of the key words factors
SPEC_CORR_CONV_n
of the operator
DEFI_SPEC_TURB
[U4.44.31], if the correlation of
AU_YANG
is used.
ORIG_AXE
=
l_coor
List of the three co-ordinates defining the position of an origin O on the axis of revolution of
cylindrical structure of circular section (see diagrams hereafter).
X
U
X
X
y
y
X
CORCOS
AU_YANG
O
Code_Aster
®
Version
7.4
Titrate:
Operator PROJ_SPEC_BASE
Date:
27/01/05
Author (S):
A. ADOBES
Key
:
U4.63.14-E
Page
:
6/6
Instruction manual
U4.6- booklet: Elementary matrices/Vectors and assembly
HT-66/05/004/A
3.9 Operands
FREQ_INIT
,
FREQ_FIN
and
NB_POIN
FREQ_INIT = fi
FREQ_FIN
=
FF
NB_POIN
=
Np
These operands define the frequency band and the number of points of discretization
frequential of the interspectres to be calculated.
The number of points of discretization must be equal to a power of 2, in order to allow
postprocessings of type FFT (Fast Fourier Transform).
The default values of the frequencies of beginning and run-out are calculated in the manner
following: if
(
)
1k
NR
K
F
F
,…,
the frequencies of the modes of K indicate
ème
base structure
then:
FREQ_ INIT
FINE FREQ_
=
=
+
min
max
K
K
K
Nk
K
F
F
F
1
1
2
2
The default value of the number of points of discretization is deduced from the minimum pitch in
frequency defined by:
(
)
df
F
I K
ik
ik
=
× ×
×
,
min 2
µ
where
ik
µ
indicate the reduced damping of I
ème
mode of K
ème
base modal.
3.10 Operand
OPTION
OPTION = “ALL”
or
“DIAG”
Indicator of the choice of calculation to be realized:
·
“ALL”
if one wishes to calculate all the interspectres generalized excitations
(default option),
·
“DIAG”
if one wishes to calculate only the autospectres generalized excitations.
3.11 Operand
TITRATE
TITRATE = title
Argument of the text type defining the title attached to the concept
tabl_intsp
at exit.