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an AC problem, about "The DAE is structurally inconsistent"

Posted 1 mars 2014, 08:19 UTC−5 Low-Frequency Electromagnetics Version 4.3a, Version 4.3b 2 Replies

Lance Vega
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Hello everyone


I want to apply a sine voltage source to a piezoelectric ceramic. it's a model of COMSOL named"thickness_shear_quartz_oscillator.mph". the model works well but when I change the AC source to sine source, set the frequency 50Hz, same as AC. error occurs:

The DAE is structurally inconsistent

Variabels 2
Equation 0

you can see the model in the model library, hope you can help me

Thanks in Advance
2 Replies Last Post 23 sept. 2014, 08:04 UTC−4
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Hello Lance Vega

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Sharareh Haddadi
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Posted: 1 decade ago 26 juil. 2014, 06:09 UTC−4
I HAVE THIS PROBLEM TOO BUT I CAN'T SOLVE IT IF YOU FIND IT OUT PLEASE LET ME KNOW
I HAVE THIS PROBLEM TOO BUT I CAN'T SOLVE IT IF YOU FIND IT OUT PLEASE LET ME KNOW
Otto13
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Posted: 1 decade ago 23 sept. 2014, 08:04 UTC−4

it's a problem with the study. you can use sin(φ) for voltage source and frequency domain study and vice versa. I encounter this problem when I work on AC/DC module on the "Electric circuit" . this generalize to all the sources and studies.

so i recommend you follow this pattern when solving

DC source -> stationary study
AC '' -> frequency domain
Sin (t/T) -> time dependent
it's a problem with the study. you can use sin(φ) for voltage source and frequency domain study and vice versa. I encounter this problem when I work on AC/DC module on the "Electric circuit" . this generalize to all the sources and studies. so i recommend you follow this pattern when solving DC source -> stationary study AC '' -> frequency domain Sin (t/T) -> time dependent

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