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2 cards from this section. Quick, good the night before a test.
Define effective modal mass.
Think about how modes influence overall behavior.
What is the formula for calculating effective modal mass?
Consider the components involved!
What does effective modal mass measure?
Think about the role of vibration modes.
True or False: The modal participation factor is squared in the effective modal mass calculation to emphasize larger contributions.
Recollect the formula discussed.
A building's effective modal mass is calculated as follows for three contributing modes: Mode 1 (M_eff1 = 0.4), Mode 2 (M_eff2 = 0.36), Mode 3 (M_eff3 = 0.25). What is the cumulative effective modal mass? Next, if the total mass of the building is 1000 kg, how much mass is effectively accounted for?
Add up the effective masses first.
If a system shows a modal participation factor of 0.9 and the effective modal mass calculated is 500 kg for the first mode, what is the effective modal mass considering all factors?
Calculate it step by step using the squared participation factor.
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