Simulink simulation error: solution not finite
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I encountered the following simulation error:
I tried reducing the step size in the solver but it doesn't work. How should I fix this?
6 个评论
Walter Roberson
2021-10-15
Sometimes there is just a singularity, and you need to either change the blocks (so you are doing something different), or else you need to change the initial or boundary conditions in a way that avoids the singularity.
I recommend logging (scoping) the output of the signal to see what the trend is.
Randy Chen
2021-10-23
Hi, here is what happened to the scope of my angle:
It seems like at T=3.5 s, the angle just blew up to an astronomical value. I wonder how I should fix this error?
Randy Chen
2021-10-23
Walter Roberson
2021-10-23
I suggest that set the stop time to 3.5 and look at the signal. Flat on the 10^190 scale might be pretty bumpy locally.
Randy Chen
2021-10-23
It turns out that 3.5 seconds also yields a non-finite result. I changed the stop time to 2.3 seconds, and here is what happened:
\Does this mean I have to tune my PID gains now?
Walter Roberson
2021-10-23
I am a little confused, in that your original post the error message had a singularity about 1.88 seconds
Sorry, I have never looked at airfoils at all.
回答（1 个）
Aqib Memon
2021-10-23
0 个投票
Are you using a fixed time step in your simulation settings? if yes, then try setting it to variable time step and see if it works.
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