Teeter-Totter, Playground along Riverview Blvd, Kent, Washington State
I gave the teeter-totter an initial displacement, without human riders, and recorded the damped sine oscillation with my Android smartphone accelerometer app. The natural frequency was 2.1 Hz with 0.6% damping. The frequency would decrease with riders.
– Tom Irvine
Good morning, Tom, Thank you foe sharing you investigation. It is cute — it’s clear you like children, like your smartphone and frequency analysis. * What are in the file of accerelerometr data? I see two columns but no titles. * I have some experimental results concerning the cycle shape in fatigue. I found them very interesting. Now I am looking for a co-author and ideas for publication . Could we discuss? Good day. Irina Gadolina