Very good explanation, thank you!

Thank you so much

thank you, very good video!

well helped

Altering the resonate frequency of an object is the key to an entirely new era of human technology.

I want to find the damping ratio of a helical spring using this method: 1. Attach an accelerometer at the top of the spring. 2. Disturb the spring by hand to generate a time vs. frequency graph. 3. Convert this time vs. frequency graph to an FFT to see the frequency vs. amplitude graph. 4. Find the damping ratio using the half-bandwidth method on the FFT. My questions are: a. Is this the right method to find the damping ratio, or is the FRF necessary to include the force with hammer impact? b. What if I use or don't use an impact hammer as in this video?

in FRF plots @4:00 : the vertical axes do not appear to be correct. The Imag axis should be Flipped in the lower phase diagram.

Hello, among the three elements of frequency, damping and vibration mode obtained in modal analysis, does damping refer to "damping factor" or "damping ratio"? Is it the latter? Thank you and look forward to your reply

Where is the powerpoint plug in they mentioned ? Any link to download it ?

At 5:04 isn't the left spring system supposed to dampen over time?