Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Frequency-Domain, Perturbation
Posted 11 juin 2013, 08:42 UTC−4 Low-Frequency Electromagnetics, Battery Design, Studies & Solvers Version 4.3b 1 Reply
Please login with a confirmed email address before reporting spam
Dear all,
I'm simulating impedance spectra on a newman type lithium ion battery model. I use one single solver Step: Frequency-Domain, Perturbation. There is one single "Electrode Current Densitiy" -node in my model, with the harmonic perturbation option checked.
Everything works fine, the results are the same as with (unbiased) 'manual' time domain calculation.
I'm not sure though, what this Frequency-Domain, Perturbation solver actually does. Results aren't sensitive at all to changes in "Inward electrode current densitiy", the only parameter I can modify here. Only if put in a 0, results are NaN.
Is there a bias? What is the current value in "Inward electrode current densitiy"? If it would be the current bias, a 10C rate should influence the impedance spectrum, but it doesn't.
Thanks for your help.
I'm simulating impedance spectra on a newman type lithium ion battery model. I use one single solver Step: Frequency-Domain, Perturbation. There is one single "Electrode Current Densitiy" -node in my model, with the harmonic perturbation option checked.
Everything works fine, the results are the same as with (unbiased) 'manual' time domain calculation.
I'm not sure though, what this Frequency-Domain, Perturbation solver actually does. Results aren't sensitive at all to changes in "Inward electrode current densitiy", the only parameter I can modify here. Only if put in a 0, results are NaN.
Is there a bias? What is the current value in "Inward electrode current densitiy"? If it would be the current bias, a 10C rate should influence the impedance spectrum, but it doesn't.
Thanks for your help.
1 Reply Last Post 14 juin 2013, 10:15 UTC−4
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
does nobody have an idea? Also, it would be interesting to know how the linearized perturbation terms look like. I expect them to be a steady state variable_1 + Real(variable_2 * exp(j*w*t)). But I cannot find anything about it in the doc.