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3 cards from this section. Quick, good the night before a test.
What is free vibration?
Think of a swing that keeps moving after you push it.
Define natural frequency in simple terms.
It's like the rhythm you hear when you pluck a guitar string.
What type of vibration occurs when a structure vibrates due to external forces?
Think about external influences like wind.
True or False: Natural frequency is influenced by the mass and stiffness of a structure.
Recall our discussion about how heavier structures vibrate differently.
A bridge made of steel has a mass of 5000 kg and a stiffness of 120000 N/m. Determine its natural frequency.
Plug in the values carefully and remember to take the square root.
Consider an old building with a period of 0.5 seconds. What is its natural frequency?
Convert the period into frequency with this simple division!
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