Friction Isolator

[Solar88]

Hallo ,

I´m having an issue with Friction Isolator. I´ve defined a SDOF-System (look attachment). There is a single mass in x-Direction (200). I´ve defined a stiffness in U1 and U2 direction (nonlinear).

Now I want to change the Friction coefficient (slow and fast) to calculate the displacements of the mass-point. But it does not matter what i choose for the value , the displacement is always the same!

For the Load case I´ve defined a time history function and a ramp-function (this is for the vertical Load of the friction Isolator).

I hope someone can help me.

 

[stressed]

Judging from your graphic, you'll need weight in the vertical direction in order to account for friction. If the link local 1 axis is in global +Z, then you'll need to input a fairly rigid stiffness in the local 1 direction of the friction link and input friction coefficients in the local 2 and 3 directions.

Load case(s) needs to be specified as Nonlinear.

 

[Solar88]

Hi stressed,

thanks for your advice! I´ve forgotten to define weight. This is how it works.