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Phase of the loads in a frequency response analysis
Posted 2010年1月5日 GMT-5 08:33 0 Replies
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Hi,
I am simulating an axisymmetric circular capacitive membrane model where I use electrostatics(emes), pressure acoustics(acpr), moving mesh and stress-strain(acaxi) modes. I am obtaining wrong frequency responses around the resonance frequency and I have doubts about the phase of the loads I am entering when coupling these physics together.
For instance, electrostatics mode produce the electrostatic forces Fes_nTr_emes and Fes_nTz_emes. I apply these forces to the electrode in stress-strain mode. The obtained result is true in a static analysis but it fails around the resonance freq. for a frequency response analysis as I mentioned. I realized that I might be entering only the amplitudes of the force phasors, not the phases. What I do is
Quantity, Value Value
Fr, Frph Fes_nTr_emes 0 N/m^2, deg
Fz, Fzph Fes_nTz_emes 0 N/m^2, deg
but the correct one should be something lik this, if I am not mistaken,
Quantity, Value Value
Fr, Frph abs(Fes_nTr_emes) angle(Fes_nTr_emes) N/m^2, deg
Fz, Fzph abs(Fes_nTz_emes) angle(Fes_nTr_emes) N/m^2, deg
Does anyone have any idea about this ?
Thanks,
Hello Ahmet Yildirim
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