I am analyzing the squeal of simple brake using Abaqus and I tried to find the unstable frequencies using complex frequency which caused the squealing noise; however, all of the modes have nearly zero dampings (lie on the imaginary axis) and the pairs of modes which become coupled and formed a stable/unstable pair couldn't be found. I attach the brake model in the comment. How can I found some unstable frequencies using Abaqus?
Did you introduce Coulomb friction between pad and disc? Did you apply a pressure load on the back plate? Did you use any additional damping effect, e.g. material damping, modal damping etc.?
Nils Wagner Yes. I applied those you mentioned. I share the inp file.
Seyed Jamaleddin Mostafavi Yazdi I have slightly modified your model and found one unstable mode pair.
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