Modal Mass calculation
Hi Is it possible to calculate the modal mass for a particular mode shape? Can someone please explain how to do it.
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Hi in the eigenfrequency solver sequence (quite deep down in the solver tree), you have the option for the normalisation of the eigenvectors/frequencies, such as RMS, and model mass, once changed you...
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I have the participation factors (u,v,w) for a particular mode. I want to calculate the effective or modal mass for that mode. Really confused about that. Is it mass participation factor or modal...
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Hi the square of the partcpation factor is the mass, ifyou sum the squares for many modes you will get the total mass per direction I's described somewhere in the doc too (try a search ;) -- Good luck...
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Hi Thanks for the reply. Just to clear my head. For example, for a particular mode... MPF in u direction=a MPF in v direction=b MPF in w direction=c so the effective mass for that mode would be=...
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Hi The effective masses are per cartesian orthogonal directions, and each add up to Mass ="total mass" = int1(solid.rho) over all domains. so when I ask for the mass participation factor I use...
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Hi I have a total mass of 2.217E-5 kg for clamped edge circular plate. My MPF for the first mode of vibration are MPFu= 4.703E-8 MPFv=1.14201E-8 MPFw=0.00343 so the modal mass I get is:...
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Hi i believe you should add up the square of the modal masses for the first N modes direction by direction, then it should get to the total mass, if you take enough modes. What I do is to calculate the...
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Hello Ivar, I would like to add one question to the discussion. After running my simulation and computing the effective masses for each direction, let's call them m_eff_x, m_eff_y, m_eff_z, I would...
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Hi normally the effective mass variable are normalised such that the sum of the square of each participative mass value, per direction adds up to the total mass of the object, so what I often do is to...
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