peteroznewman
Subscriber
You have to increase mass or reduce stiffness or both in order to bring the 8 Hz down to 1.66 Hz. There is no such thing as artificial mass. It sounds like the author needed to add mass to get the model to match the experiment.
Do you have mode shapes for the first three frequencies you opened with? Because you will want to tune the model to have modes as close as possible to the other two frequencies as well...
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