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#1 2019-05-03 09:12:06

pironman
Member
Registered: 2018-05-15
Posts: 50

Dynamic harmonic simulation with hysteretic damping

I have done a dynamic harmonic simulation of a system without damping. Now, I want to do the same simulation, by adding the damping.
To do this, in the material properties I have add an Hysteretic damping of 0.08 (steel), I modify the ASSEMBLAGE by adding the 3rd matrice RIGI_MECA_HYST, that I call "Ks". Then, in DYNA_VIBRA, I set "MATR_RIGI = Ks".
When I start the simulation, I read this:


Matrices dynamiques pour la résolution
--------------------------------------------------------------------------------------
    >> matrice de masse        : M
    >> matrice de rigidité     : Ks
    >> système conservatif, sans amortissement.


I have a doubt, it is correct my procedure?

Thank you

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#2 2019-05-03 17:24:08

jeanpierreaubry
Guru
From: nantes (france)
Registered: 2009-03-12
Posts: 3,569

Re: Dynamic harmonic simulation with hysteretic damping

hello

i think [one of] the right way is as below
i seldom do this kind of hystertic damping
i suppose yo know what you are doing in using it


#first define damping in material
steel=DEFI_MATERIAU (
       ELAS=_F (
              E = 210000. , NU = 0.3 , RHO = 8.0 e-9,
              AMOR_HYST = 0.08,
       )
);

ASSEMBLAGE (
       MODELE=model , CHAM_MATER=material , CARA_ELEM=elemcar ,
       CHARGE=ground ,
       NUME_DDL=CO ( 'numdof' ) ,
       MATR_ASSE = (
              #this line for the material without damping
              _F ( MATRICE=CO ( 'rigidity' ) , OPTION='RIGI_MECA', ) ,
              _F ( MATRICE=CO ( 'masse' ) , OPTION='MASS_MECA', ) ,
              #next line for the material with hystertic damping
              _F ( MATRICE=CO ( 'damp' ) , OPTION='RIGI_MECA_HYST', ) ,
		),
);

jean pierre aubry

Last edited by jeanpierreaubry (2019-05-03 17:25:05)

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