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I have been trying to implement an MDOF fit with MATLAB but I am having a hard time. The problem is that you do not give estimated values to MATLAB, so when you use commands like 'modalfit' it does not replicate the initial FRF in a good way. I tried also to create a continuous-time FRF by...

Hello, I have one more doubt about what you said earlier Greg. The phase you are referring to is the phase of the FRF at each natural frequency? And if so, could you link me some theorical background for that because I do not see the correlation between that phase and the mode shapes one...

Thank you a lot for the explanation Greg. Do you have any reference on a good MDOF fit and maybe with some MATLAB info that can help me to program it if I decide to go with one of those? My teacher suggested me to go simple with peak picking since currently I am undergraduate, but for this task...

But why should I use viscous damiping as a paramater when I have well determined its value? The problem I have is how to get from the magnitude of the modal constant to a complex number so i can get complex mode shapes and not just real ones.

The mode shapes are not inherently real in a viscous system. It is not proportional damping so I do not understand your answer

Hello, So I have a set of measured FRFs gathered from the vibration laboratory. I am using a peak picking method to reconstruct the magnitude of the FRF and get the natural frequencies, damping coefficient and modal constant (two mode shapes components multiplying each other). Knowing the...