Bar Danino
Aug 25, 2017 · 1 min read

This isn’t resonance. Resonance has a very specific meaning, it happens at a natural frequency, or the frequency in which the system will vibrate without external stimuli.

In this case, the external stimuli wasn’t at the natural frequency (according to the article at least). You can cause any system to vibrate at any frequency, it won’t be a resonance phenomenon unless the frequency of the input (wind in this case) is the same as the output.

When the input is periodic, the system vibrations will be periodic too (eventually) and have the same frequency as the input, and the vibration amplitude will be a function of the frequency. The natural frequency will provide the greatest amplitude (which is why it is so dangerous), but if the input is intense enough you can cause failure with different frequencies as well.

For more, read about Bode diagrams.

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    Bar Danino

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    Mechanical engineer, writer. I build stuff and write fiction. Feel free to contact me at bar.david.danino@gmail.com