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Code_Aster
®
Version
7.4
Titrate:
Operator
POST_DYNA_MODA_T
Date:
27/01/05
Author (S):
E. BOYERE, L. VIVAN
Key
:
U4.84.02-F
Page
:
1/8
Instruction manual
U4.8- booklet: Dedicated Post processing and analyzes
HT-66/05/004/A
Organization (S):
EDF-R & D/AMA, CS IF














Instruction manual
U4.8- booklet: Dedicated Post processing and analyzes
Document: U4.84.02



Operator
POST_DYNA_MODA_T








1 Goal
Post-to treat the results in generalized co-ordinates produced by DYNA_TRAN_MODAL. Two options
are available: post processing of nonthe linearities of shock or the relations effort-displacement. In
the first case, one chooses a diagnosis of wear or a better knowledge of the shocks which have occurred
during the transitory analysis. Contents of
count
produced is printable on the file
RESULT
by the control
IMPR_TABLE
[U4.91.03].
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Code_Aster
®
Version
7.4
Titrate:
Operator
POST_DYNA_MODA_T
Date:
27/01/05
Author (S):
E. BOYERE, L. VIVAN
Key
:
U4.84.02-F
Page
:
2/8
Instruction manual
U4.8- booklet: Dedicated Post processing and analyzes
HT-66/05/004/A
2 Syntax
count [table] = POST_DYNA_MODA_T
(
RESU_GENE
=
tg,
[tran_gene]
/SHOCK
=_F (
INST_INIT =/- 1.0, [DEFECT]
/
t0,
[R]
INST_FIN =/999., [DEFECT]
/
T1,
[R]
NB_BLOC =/1,
[DEFECT]
/
Nb,
[I]
SEUIL_FORCE =/0.0 [DEFECT]
/S, [R]
DUREE_REPOS =/0.0, [DEFECT]
/D, [R]
OPTION =/“WEAR”, [DEFECT]
/“IMPACT”,
NB_CLASSE
=/10,
[DEFECT]
/
nc,
[I]
),
/
RELA_EFFO_DEPL
=_F (
NODE = noeu,
[node]
NOM_CMP = noncmp,
[K8]
),
INFORMATION
=
/
1,
[DEFECT]
/2,
TITRATE
= title,
[l_Kn]
)
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Code_Aster
®
Version
7.4
Titrate:
Operator
POST_DYNA_MODA_T
Date:
27/01/05
Author (S):
E. BOYERE, L. VIVAN
Key
:
U4.84.02-F
Page
:
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Instruction manual
U4.8- booklet: Dedicated Post processing and analyzes
HT-66/05/004/A
3 Operands
3.1 Operand
RESU_GENE
RESU_GENE = tg
Result of a transitory calculation by modal recombination, produced by the operator
DYNA_TRAN_MODAL
[U4.53.21].
3.2 Word
key
SHOCK
SHOCK
Key word factor allowing to specify that one wishes an analysis of non-linearities of shock
takings into account in modal transitory calculation.
3.2.1 Operand
INST_INIT
INST_INIT = T
0
Moment of beginning of the average of the signals and analysis of the shocks. By defect
T
0
corresponds to
first moment of transitory calculation by modal recombination.
3.2.2 Operand
INST_FIN
INST_FIN = T
1
Moment of end of the average of the signals and analysis of the shocks.
(
T
1
= 999.
default value),
3.2.3 Operand
NB_BLOC
NB_BLOC = Nb
A number of temporal blocks of division interval [
T
0
,
T
1
] for the average of the signals
(
1
by defect).
The key word is not used for the option
“IMPACT”
.
3.2.4 Operand
SEUIL_FORCE
SEUIL_FORCE = S
Threshold characterizing a phase of contact, (
F
N
>
S
established contact)
(
S = 0.
default value).
3.2.5 Operand
DUREE_REPOS
DUREE_REPOS = D
[
]
D
T
T
Tc Tc
D
S
D = 0.
C
minimal duration of rest characterizing the end of a shock,
end of shock
,
default value
+
,
.
F
N
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Code_Aster
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Version
7.4
Titrate:
Operator
POST_DYNA_MODA_T
Date:
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Author (S):
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Key
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U4.84.02-F
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3.2.6 Operand
OPTION
OPTION =/“WEAR”
/
“IMPACT”
This key word makes it possible to choose between a postprocessing for a diagnosis of wear (key word
“WEAR”
) or of a better knowledge of the possible shocks which have occurred during the analysis
transient (key word “IMPACT”). This last post processing is adapted to the calculation of the interns of
power stations ITEM to see [§4].
3.2.7 Operand
NB_CLASSE
NB_CLASSE = nc
A number of classes which the user wants to distinguish during the development of the describing histogram
the maximum ones of forces of impact. By defect,
nc = 10
.

3.3 Word
key
RELA_EFFO_DEPL
RELA_EFFO_DEPL
Key word factor allowing an analysis of the relations of non-linearity effort-displacement.
One files in the table result the name of the relation to the node observed, the moments of analysis and
the maximum reached by the component observed during the analysis.
All the phases with nonlinear behavior are determined and one files in the table result
for each one:
·
the initial moment and the final moment of the interval of the nonlinear phase,
·
the maximum reached and the moment associated in this interval.
3.3.1 Operand
NODE
NODE = noeu
Name of the node of the structure on which the nonlinear relation to treat was defined.
3.3.2 Operand
NOM_CMP
NOM_CMP = noncmp
Name of the component treated with the node
noeu
.

3.4 Operand
INFORMATION
INFORMATION = imp
, level of the impressions
/1
no impression on the file
message
(all is stored in the produced table)
/2
impression of the number of pitches of calculating time

3.5 Operand
TITRATE
TITRATE = title
titrate
is the title of calculation. It will be printed at the head results. It is stored in the concept
count.
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Code_Aster
®
Version
7.4
Titrate:
Operator
POST_DYNA_MODA_T
Date:
27/01/05
Author (S):
E. BOYERE, L. VIVAN
Key
:
U4.84.02-F
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:
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Instruction manual
U4.8- booklet: Dedicated Post processing and analyzes
HT-66/05/004/A
4
Checking - Execution
4.1
For the key word factor
SHOCK
The value of
INST_FIN
is compared with the final moment
T
F
result
tran_gene
. The value of
INST_FIN
reserve is
()
min T, T
F
1
.
If the value of
INST_INIT
T
0
is higher than the value of
INST_FIN
, one stops in error.
Block 1
Block 2
F shock
SEUIL_FORCE
INST_INIT
INST_FIN
DUREE_REPOS
Block 1: 1 shock
Block 2: 2 shocks
: signal taken into account in the statistics
T
0
T
1
D

4.1.1 Execution with option
“IMPACT”
For each nonlinearity of shock, one calculates and one files in the table result:
·
shocks and associated sizes:
for each shock, one with the value of the moment when the force is maximum, the value of the force
maximum and of the impulse, duration of the shock, touch-down speed and the number of rebounds,
·
total data of the shock:
on the whole of the noted shocks, one specifies: the absolute maximum of force of shock,
average value of maximum of forces of shock and the standard deviation of the extrema of force of shocks,
·
the histogram describing the max of the forces of impact:
there is the number of classes of the histogram, the values of his X-coordinates (force min and max
of each class) and density of probability of the maximum force of each class.
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Code_Aster
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Version
7.4
Titrate:
Operator
POST_DYNA_MODA_T
Date:
27/01/05
Author (S):
E. BOYERE, L. VIVAN
Key
:
U4.84.02-F
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:
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U4.8- booklet: Dedicated Post processing and analyzes
HT-66/05/004/A
4.1.2 Execution with the option
“WEAR”
For each nonlinearity of shock, one calculates and one files in the table result:
·
average values min, max, standard deviation, RMS of relative displacements of the nodes of
shocks in their total reference mark,
·
average values and RMS (over the time of shock and total time) like min and max of
normal and tangential forces of shock,
·
the number of average shocks on each connection of shock, the time of average shock, time
of average rebound,
·
power of average wear calculated within the meaning of ARCHARD [bib1]:
()
()
P
T
F T V T dt
wear
NR
T
T
=
1
0
.

4.2
For the key word factor
RELA_EFFO_DEPL
It is checked that the node
noeu
corresponds to a nonlinear relation.
One prints using the control
IMPR_TABLE
:

---------------------------------------------------------------------------
ASTER 4.03.15 CONCEPT TABLE CALCULATES THE 03/02/98 A 12:08:19 OF TYPE
TABL_POST_DYNA
RELATION
NODE
CMP
PHASE
INST_INIT
INST_FIN
MAXIMUM
INST_MAXI
NON_LIN
N100
DRY
1
1.24000E+00
1.26600E+00
1.80716E-05 1.25200E+00
NON_LIN
N100
DRY
2
2.02600E+00
2.09000E+00
- 2.00433E-05 2.05800E+00
NON_LIN
N100
DRY
3
3.00000E+00
3.04000E+00
- 1.89110E-05 3.02200E+00
NON_LIN
N100
DRY
4
3.10400E+00
3.20400E+00
3.50715E-05 3.15400E+00
NON_LIN
N100
DRY
5
3.26000E+00
3.33600E+00
- 2.91359E-05 3.30000E+00
NON_LIN
N100
DRY
6
3.41400E+00
3.43200E+00
1.73099E-05 3.42400E+00


.
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Code_Aster
®
Version
7.4
Titrate:
Operator
POST_DYNA_MODA_T
Date:
27/01/05
Author (S):
E. BOYERE, L. VIVAN
Key
:
U4.84.02-F
Page
:
7/8
Instruction manual
U4.8- booklet: Dedicated Post processing and analyzes
HT-66/05/004/A
5 Examples
of use
5.1
Example with the option
IMPACT
: to launch of an oscillator with shock
Test SDND101 here is presented. It is a question of calculating the response of a system mass-arises from
initial speed
V
0
nonnull, being able to impact on a stop with shock. The initial play is null.
K
m
V0
Kchoc
One compares the values of the moments of maximum force, value of maximum force, duration of the time of
shock, value of the impulse and touch-down speed as well as the number of elementary impacts for
the first two oscillations of the system to the analytical values.
Command file
CONTINUATION
()
# The system mass-arises east releases with an initial speed V0
#
VITEPHYS = AFFE_CHAM_NO (
MAILLAGE= beam,
GRANDEUR=
“DEPL_R”,
CHAM_NO
=
vectass,
AFFE=
(
TOUT=
“YES”,
NOM_CMP=
(
“DX”
),
VALE_R=
V0
)
)
#
VITINI
=
PROJ_VECT_BASE
(BASE= MODES, VECT_ASSE= VITEPHYS,
NUME_DDL_GENE=
NUMEGE,
TYPE_VECT=
“QUICKLY”)
#
MASSEGEN = PROJ_MATR_BASE (BASE= MODES,
NUME_DDL_GENE=
NUMEGE,
MATR_ASSE=
MATRMASS,
)
#
RIGIDGEN = PROJ_MATR_BASE (BASE= MODES,
NUME_DDL_GENE=
NUMEGE,
MATR_ASSE=
MATRRIGI,
)
#
PLANZ = DEFI_OBSTACLE (TYPE= “PLAN_Z”)
PLANY = DEFI_OBSTACLE (TYPE= “PLAN_Y”)
#
DYNAMODA
=
DYNA_TRAN_MODAL
(METHOD = “EULER”,
MASSE_GENE
=
MASSEGEN,
RIGI_GENE
=
RIGIDGEN,
AMOR_REDUIT=
0.,
ETAT_INIT=_F (VITE_INIT_GENE=VITINI),
INCREMENT=_F (
INST_INIT= 0.,
INST_FIN=
0.5,
PAS=
0.0005
),
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Code_Aster
®
Version
7.4
Titrate:
Operator
POST_DYNA_MODA_T
Date:
27/01/05
Author (S):
E. BOYERE, L. VIVAN
Key
:
U4.84.02-F
Page
:
8/8
Instruction manual
U4.8- booklet: Dedicated Post processing and analyzes
HT-66/05/004/A
CHOC=
_F (
NOEUD_1=
“NO1”,
OBSTACLE=
PLANZ,
ORIG_OBST=
(- 1.,
0.,
0.),
NORM_OBST=
(0.
0.
1.),
JEU=
1.00,
RIGI_NOR=
1000000.,
RIGI_TAN=
0.,
COULOMB=
0.
)
)
# Postprocessing of the efforts of shock
TT
= POST_DYNA_MODA_T
(RESU_GENE = DYNAMODA,
CHOC=
_F (
INST_INIT
= 0.,
INST_FIN
=
0.495,
SEUIL_FORCE
=
0.,
DUREE_REPOS
=
0.,
OPTION
=
“IMPACT”,
NB_CLASSE
=
8
),
INFORMATION
=
1
)

IMPR_TABLE (TABLE = TT,
FILTER
=
(
NOM_PARA=
“CALCULATION”,
VALE_K
=
“TOTAL”
),
NOM_PARA=
(
“NODE”,
“F_MAX_ABS”,
“F_MAX_MOY”,
“F_MAX_ETYPE”
))




6 Bibliography
[1]
ARCHARD: The wear off metals under unlubrificated conditions Proc-Roy-Plowshare. (1956).