I used Microsoft Paint program to add some contrast to the image that was grey on grey.I tried to read it, but I really couldn't. Wasn't very large or clear.
It's such a poor image it's hard to extract the actual values. For my eye, the first peak is around 440mV and the steady state final value is about 250mV. So the difference would give Vpeak=190mV. But that probably wouldn't account for the disparity in our respective damping factor calculations.I think the Vpeak is wrongly calculated.
Vpeak =430-225=205 mV as per my calculation.
If its so, then whats it suppose to be ?
It's a pain often trying to pin down these wretched equations ...I see several things wrong. Some of it is simply "eye calibration."
snip ....
6. Damping Ratio = { 1+ [ln(∏/0.720)]^2 }^(-0.5) = 0.104
snip ....
Yeah, that's right. Looks better in LaTex or whatever you call it. I had the equation correct before I transferred it from paper to keyboard. I admire your ability to be able to use it so well. I really struggle to write equations with that program.It's a pain often trying to pin down these wretched equations ...
The actual equation should read ....
\(\LARGE{\zeta=\frac{1}{\sqr{1 + {\( \frac{\pi}{\ln{ \( \frac{V_{pk} - V_{SS}}{V_{SS}} \) }}\)}^2 }}}\)
Where Vpk is the output response peak value and Vss is the steady-state [final] output value
by Robert Keim
by Aaron Carman
by Aaron Carman
by Jake Hertz