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

Organization (S): EDF-R & D/AMA, CS IF

Handbook of Utilization
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. The contents of the produced table are printable on file RESULTAT
by command IMPR_TABLE [U4.91.03].
Handbook of Utilization
U4.8- booklet: Dedicated Post processing and analyzes
HT-66/05/004/A

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

2 Syntax

count [table] = POST_DYNA_MODA_T (









RESU_GENE
=
tg,
[tran_gene]








/CHOC
=_F (













INST_INIT =/- 1.0, [DEFECT]

/
t0,
[R]













INST_FIN =/999., [DEFAUT]

/
T1,
[R]













NB_BLOC =/1,
[DEFAUT]
/
Nb,
[I]













SEUIL_FORCE =/0.0 [DEFECT]


















/S, [R]













DUREE_REPOS =/0.0, [DEFECT]


















/D, [R]













OPTION =/“WEAR”, [DEFECT]



/“IMPACT”,













NB_CLASSE
=/10,
[DEFAUT]
/
nc,
[I]












),









/RELA_EFFO_DEPL
=_F (













NOEUD = noeu,
[node]













NOM_CMP = noncmp, [K8]















),








INFO
=
/
1,
[DEFAUT]












/2,








TITER
= title,
[l_Kn]








)

Handbook of Utilization
U4.8- booklet: Dedicated Post processing and analyzes
HT-66/05/004/A

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
: 3/8

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
CHOC


CHOC

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 corresponds to
0
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.
(T1 = 999. default value),

3.2.3 Operand
NB_BLOC


NB_BLOC = Nb

A number of temporal blocks of division the interval [T,] for the average of the signals
0 T1
(1 per defect).

The key word is not used for option “IMPACT”.

3.2.4 Operand
SEUIL_FORCE


SEUIL_FORCE = S

Threshold characterizing a phase of contact, (fn > S established contact)

(S = 0. default value).

3.2.5 Operand
DUREE_REPOS


DUREE_REPOS = D

D
minimal duration of rest characterizing the end of a shock,
T
end of shock
T
,
+
F,
C
[Tc Tc D]
S
N

D = 0.
default value.
Handbook of Utilization
U4.8- booklet: Dedicated Post processing and analyzes
HT-66/05/004/A

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
: 4/8

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
“USURE”) 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 REP 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
NOEUD

NOEUD = 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
INFO


INFO = 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 steps of calculating time

3.5 Operand
TITER


TITER = title

title is the title of calculation. It will be printed at the head results. It is stored in the concept
count.
Handbook of Utilization
U4.8- booklet: Dedicated Post processing and analyzes
HT-66/05/004/A

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
: 5/8

4
Checking - Execution

4.1
For the key word factor CHOC

The value of INST_FIN is compared with the final moment T F of the result

tran_gene. The value of
INST_FIN selected is
(
min T, T
F
1).

If the value of INST_INIT t0 is higher than the value of INST_FIN, one stops in error.

F shock
Block 1
Block 2
SEUIL_FORCE
T
T
0
1
D
INST_INIT
INST_FIN
DUREE_REPOS
Block 1: 1 shock
Block 2: 2 shocks
: signal taken into account in the statistics


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, impact 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.
Handbook of Utilization
U4.8- booklet: Dedicated Post processing and analyzes
HT-66/05/004/A

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
: 6/8

4.1.2 Execution with option “USURE”

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]:

1 T
P
=
F (T) .V (T) dt
wear


T
NR
T
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 command IMPR_TABLE:

---------------------------------------------------------------------------

ASTER 4.03.15 CONCEPT TABLE CALCULATES THE 03/02/98 A 12:08:19 OF TYPE
TABL_POST_DYNA
RELATION
NOEUD
CMP
PHASE
INST_INIT
INST_FIN


MAXI
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

.
Handbook of Utilization
U4.8- booklet: Dedicated Post processing and analyzes
HT-66/05/004/A

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

5 Examples
of use

5.1
Example with 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 V0 nonnull, being able to impact on a thrust with shock. The initial play is null.

K
m
Kchoc
V0


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 impact speed as well as the number of elementary impacts for
the first two oscillations of the system to the analytical values.

Command file

POURSUITE
()


# 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=
“OUI”,


NOM_CMP=
(
“DX”
),


VALE_R=

V0

)









)


#
VITINI
=
PROJ_VECT_BASE

(BASE= MODES, VECT_ASSE= VITEPHYS,
NUME_DDL_GENE=
NUMEGE,
TYPE_VECT=
“VITE”)



#


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
),
Handbook of Utilization
U4.8- booklet: Dedicated Post processing and analyzes
HT-66/05/004/A

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


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
),
INFO
=
1









)


IMPR_TABLE (TABLE = TT,
FILTRE
=
(
NOM_PARA=
“CALCUL”,
VALE_K

=
“GLOBAL”
),
NOM_PARA=
(
“NOEUD”,
“F_MAX_ABS”,
“F_MAX_MOY”,
“F_MAX_ETYPE”
))

6 Bibliography

[1]
ARCHARD: The wear off metals under unlubrificated Proc-Roy-Soc conditions. (1956).
Handbook of Utilization
U4.8- booklet: Dedicated Post processing and analyzes
HT-66/05/004/A

Outline document