Error: [fmi2GetContinuousStates]: Simulation terminated at t=0.0000000000000000e+00: error running events

arnigaber

Hello to all, in my first model i want to simulate a dumper using a cylinder with orifice in the line to the tank. 

I've tried different configuration but every time appears this type of error and i don't understand what it mean. 

Is there someone that can help me uderstand this error? What i have to change?

Thanks in advance! 

Arnigaber

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L Moretti

Hello Arnigaber,

 

can you share your model file?

 

 

Lorenzo

RoKet

Hi Arbigaber,

 

It's a problem of initial values. In Modelica mechanics length of elements in a row are added. with basic parameters, the initial position of v-source is 0 m, length of left rod 0,4 m. Position of fixed is 0 m => relative stroke of cylinder is 0,4 m (in right end stop). Now you have to move either v-source to the left or fixed to the right to move piston into middle of the cylinder.

 

My demo model has a fixed position of 0,2 m.

Unable to find an attachment - read this blog

arnigaber

Hi RoKet, with your help I managed to run the simulation. 

Thank you very much!

 

BrettL

Hi guys, 

 

I'm having a similar problem with a model I'm trying to set up and I'm hoping I can get some help. 

 

I've got a cylinder being driven by a position source, but when I run I get the same error. I've tried changing the fixed position as per RoKet's post above but this doesn't seem to work on this model. 

 

I eventually need to add an accumulator onto the piston side of the cylinder, but need to get this simple model working first!

 

Could someone have a look at this model and let me know what I'm doing wrong here? 

 

Many thanks!

 

Unable to find an attachment - read this blog

RoKet

Hi BrettL,

 

It's the same solution. You have to consider all positions and length. In Modelica (and the hydraulics library) positions are calculated as a row of points and lengths. In your case the row starts with the fixed element at 0 m. The cylinder has a minimum length of 0.4 m, so the rod tip has a minimum position of 0.4 m, a maximum position of 0.8 m (stroke of 0.4 m).

 

The range of position source has to be in the given limits of the cylinder, I've shifted the offset to 0.6 m (0.4 m length and initial stroke of 0.2 m). In addition I've set all initial values to the right value (cylinder stroke, s_ref, ToModelica. It's not always necessary, but helps the solver to find the correct initial state.

 

RoKet

Unable to find an attachment - read this blog

BrettL

Hey RoKet, 

 

Thanks a lot for that... your explanation makes more sense to me now. Your model works as I'd intended, so really appreciate your help. 

 

Now to work on the accumulator... /emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

 

Cheers, Brett.