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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: 3,622

### 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)