In a message dated 2008/03/16, photon1@........... writes:

> Ted, see
> http://www.jclahr.com/science/psn/damping/
> here you can calculate the ratio

Hi Ted,

       If you put in 10 mm and 0.5 mm you get a damping ratio of 0.69, but 
this applet is useful for doing rough calculations while setting up the system.
       Note that for 0.7 critical damping you only get ONE second peak. If 
you see two or more peaks, the damping is too low. If the trace never crosses 
the line, the damping is too high. For a 1 mm overshoot it is 0.59 and for a 0.1 
mm overshoot it is 0.82.

       Regards,

       Chris Chapman   
In a me=
ssage dated 2008/03/16, photon1@........... writes:



Ted, see

http://www.jclahr.co=
m/science/psn/damping/

here you can calculate the ratio




Hi Ted,



       If you put in 10 mm and 0.5 mm you get=20=
a damping ratio of 0.69, but this applet is useful for doing rough calculati=
ons while setting up the system.

       Note that for 0.7 critical damping you=20=
only get ONE second peak. If you see two or more peaks, the damping is too l=
ow. If the trace never crosses the line, the damping is too high. For a 1 mm=
 overshoot it is 0.59 and for a 0.1 mm overshoot it is 0.82.



       Regards,



       Chris Chapman