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#1 2021-09-13 07:20:13

Hanbin
Member
From: Shanghai
Registered: 2020-07-19
Posts: 86

Question of TYPE_CHAGE=SUIV

Hi

I am confused with the difference of FIXE and SUIV. I have read STAT_NON_LINE and AFFE_CHAR_MECA's PDF , but I can not understand it well . I am using FORCE_POUTRE and it depends on the velocity of the line element. The forces generated from a formule whose NOM_PARA contains VITE_X and X.

FORCE_POUTRE=(_F(GROUP_MA=('TOUT'),
TYPE_CHARGE='FORCE',
FX=FXP,
FY=FYP,
FZ=FZP,
),

I wonder why I should use SUIV here ?If the FX ,FY ,FZ are based on the global coordinates? If so,what will the difference of SUIV and FIXE  be  in calculation.   I made a little test and when FXP=2,FY and FZ =0, the deformation under SUIV and FIXE seems to be the same.

I tried to use FIXE when the F are related to VITE and the error comes:

La charge vis dépend de la vitesse: elle doit être suiveuse. !
!                                                              !
!                                                              !
! Cette erreur est fatale. Le code s'arrête.

And what will TYPE_CHARGE=SUIV do ? I think this command will calculate the force in each iter . For example , the calculation iterates 5 times at 4.00 second, and that means the force generated from a function will be calculate 6 times.  Is that right??

I hope someone can help me .

Last edited by Hanbin (2021-09-13 08:33:58)

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#2 2021-09-13 08:27:24

Hanbin
Member
From: Shanghai
Registered: 2020-07-19
Posts: 86

Re: Question of TYPE_CHAGE=SUIV

In fact I hope to make my loads act like constant direction loads in the fig. I don't want my loads act like the follower loads in the picture which are always perpendiculars to the element, that is what I'm afraid of.

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#3 2021-09-15 05:34:07

Hanbin
Member
From: Shanghai
Registered: 2020-07-19
Posts: 86

Re: Question of TYPE_CHAGE=SUIV

And what is the difference of it with SUIV_PILO? If SUIV depends on the change of NUM_PARA, but SUIV_PILO depends on its geometry only?

Last edited by Hanbin (2021-09-15 05:42:05)

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#4 2021-09-15 18:32:35

Hanbin
Member
From: Shanghai
Registered: 2020-07-19
Posts: 86

Re: Question of TYPE_CHAGE=SUIV

Hanbin wrote:

In fact I hope to make my loads act like constant direction loads in the fig. I don't want my loads act like the follower loads in the picture which are always perpendiculars to the element, that is what I'm afraid of.

Hello

If anyone can tell me the difference with those two loads???
1:

_F(
CHARGE=vis,
),

FORCE_POUTRE=_F(GROUP_MA=('TOUT'),
TYPE_CHARGE='FORCE',
FX=2,
FY=0,
FZ=0,),)

2:
_F(
CHARGE=vis,TYPE_CHARGE='SUIV'
),

FORCE_POUTRE=_F(GROUP_MA=('TOUT'),
TYPE_CHARGE='FORCE',
FX=F1,
FY=F2,
FZ=F3,),)
where F1=2， F2=0,F3=0

Really need some advice .

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