Code_Aster ®
Version
7.4
Titrate:
Operator PROJ_SPEC_BASE
Date:
27/01/05
Author (S):
A. Key ADOBES
:
U4.63.14-E Page
: 1/6
Organization (S): EDF-R & D/MFTT
Handbook of Utilization
U4.6- booklet: Elementary matrices/Vecteurs 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 operator DEFI_SPEC_TURB [U4.44.31]. (Or them) bases (S) modal (S) can or
(can) to be defined by:
· a concept of the melasflu type produces by operator CALC_FLUI_STRU [U4.66.02],
· a concept of the mode_meca type produces by operator MODE_ITER_INV [U4.52.04] or
MODE_ITER_SIMULT [U4.52.03],
· a list of concepts of the cham_no_depl_r type 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 tabl_intsp type.
Handbook of Utilization
U4.6- booklet: Elementary matrices/Vecteurs and assembly
HT-66/05/004/A
Code_Aster ®
Version
7.4
Titrate:
Operator PROJ_SPEC_BASE
Date:
27/01/05
Author (S):
A. Key ADOBES
:
U4.63.14-E Page
: 2/6
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
=
/
“TOUT”
[DEFAUT]
/
“DIAG”
,
TITER
=
titrate
, [TXM]
);
Handbook of Utilization
U4.6- booklet: Elementary matrices/Vecteurs and assembly
HT-66/05/004/A
Code_Aster ®
Version
7.4
Titrate:
Operator PROJ_SPEC_BASE
Date:
27/01/05
Author (S):
A. Key ADOBES
:
U4.63.14-E Page
: 3/6
3 Operands
3.1 Operand
SPEC_TURB
SPEC_TURB = l_spec
List concepts of the spectrum type produced by operator DEFI_SPEC_TURB [U4.44.31]
defining several spectra of turbulent excitation.
Note:
1) The operand
SPEC_TURB allows the taking into account of several spectra of excitation
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 zones of excitation of each spectrum
from/to each other must be strictly disjoined. The zones on which
apply these excitations are defined for each spectrum, with the command
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
Operand BASE_ELAS_FLUI is employed when one wishes to carry out the projection of a spectrum
defined by one of the key words SPEC_LONG_COR_n factors, SPEC_FONC_FORME or SPEC_EXCI_POINT
of operator DEFI_SPEC_TURB [U4.44.31].
/BASE_ELAS_FLUI
=
baseflui
Concept of the melasflu type produces by the operator CALC_FLUI_STRU [U4.66.02], who 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
K
fifj ().
The concept melasflu provides moreover the name of the concept type_flui_stru produces in beginning
of study by command 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 SPEC_CORR_CONV_n factors of the operator
DEFI_SPEC_TURB [U4.44.31].
/
MODE_MECA
=
basemeca
Concept of the mode_meca type produces by 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 operator CALC_MATR_AJOU [U4.66.01] or
MACRO_MATR_AJOU [U4.66.11].
Handbook of Utilization
U4.6- booklet: Elementary matrices/Vecteurs and assembly
HT-66/05/004/A
Code_Aster ®
Version
7.4
Titrate:
Operator PROJ_SPEC_BASE
Date:
27/01/05
Author (S):
A. Key ADOBES
:
U4.63.14-E Page
: 4/6
/
CHAM_NO
=
l_cham
List concepts of the cham_no_depl_r type, which define 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 operator CALC_MATR_AJOU
[U4.66.01], where figure also 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
·
S p () is the spectral concentration of power of pressure,
·
[JAij ()] is the matrix of mutual acceptance,
·
[Sfifj ()] 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
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 SPEC_CORR_CONV_n factors of the operator
DEFI_SPEC_TURB [U4.44.31], if the user made a calculation of mass added with
operator CALC_MATR_AJOU [U4.66.01].
MODELE_INTERFACE
=
model
Concept of the model type produced by 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 this one is modelled in thin hulls of type DKT.
3.5 Operand
GROUP_MA
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 SPEC_CORR_CONV_n factors of operator DEFI_SPEC_TURB
[U4.44.31].
GROUP_MA
=
grma
Name of the group of meshs of the grid 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.
Handbook of Utilization
U4.6- booklet: Elementary matrices/Vecteurs and assembly
HT-66/05/004/A
Code_Aster ®
Version
7.4
Titrate:
Operator PROJ_SPEC_BASE
Date:
27/01/05
Author (S):
A. Key ADOBES
:
U4.63.14-E Page
: 5/6
3.6 Operand
VECT_X
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 SPEC_CORR_CONV_n factors of operator DEFI_SPEC_TURB
[U4.44.31], if the correlations of CORCOS or 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
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 SPEC_CORR_CONV_n factors of 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 defining the orthogonal direction in it in
direction of the flow on the surface of the plane structure (see diagrams hereafter).
3.8 Operand
ORIG_AXE
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 SPEC_CORR_CONV_n factors of 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
X
U
X
y
X
y
O
CORCOS
AU_YANG
Handbook of Utilization
U4.6- booklet: Elementary matrices/Vecteurs and assembly
HT-66/05/004/A
Code_Aster ®
Version
7.4
Titrate:
Operator PROJ_SPEC_BASE
Date:
27/01/05
Author (S):
A. Key ADOBES
:
U4.63.14-E Page
: 6/6
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 (K
K
F,…, F
1
NR) indicate the frequencies of the modes of the kème bases structure
then:
K
K
F
F
min 1
K
1
FREQ_ INIT =
FINE FREQ_
max F
NR
K
2
=
+
K
2
The default value of the number of points of discretization is deduced from the minimum step in
frequency defined by:
df
min (
K
2 µ × F K
=
× × I
I)
I, K
where K
µi indicates the reduced damping of the ième mode of the kème bases modal.
3.10 Operand
OPTION
OPTION = “TOUT” or “DIAG”
Indicator of the choice of calculation to be realized:
· “TOUT”
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
TITER
TITER = title
Argument of the text type defining the title attached to the concept tabl_intsp at output.
Handbook of Utilization
U4.6- booklet: Elementary matrices/Vecteurs and assembly
HT-66/05/004/A
Outline document