I suggest you to take a look to the following methods: Frequency Domain Decomposition (FDD); Enhanced Frequency Domain Decomposition (EFDD); and Stochastic Subspace Identification (SSI). These methods are very reliable and allow to estimate proper mode shapes. In particular, the basic idea of...
Thank you GregLocock, very useful!!!
I knew that the basic peak picking method in frequency domain allows to estimate ODS; anyway, if I don't wrong, there are some OMA methods, like EFDD or SSI, that allow to estimate proper mode shapes. Isn't it?
Thank you very much! Your explanation is very clear.
In order to get a formal demonstration, do you think that it could be argued what follows?
Since power spectral density matrix of acceleration signals is for each frequency proportional to the power spectral density matrix of displacement...
Hi everyone.
Operational Modal Analysis allows to estimate modal properties (natural frequencies, mode shapes, etc.) of a structure from ambient vibration tests. Several methods are developed to this aim: FDD, EFDD, SSI, etc. All methods require the measurement of the dynamic response of the...
Hi everyone,
I have a large model, how can I select an object (point, node, beam, etc.) in Abaqus CAE if I know its ID number? Can I get a selectable list of objects sorted by their ID number?
I'm new to the forum, so I apologize if I made any mistake in posting this thread.
Thanks!
DC
