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Laplace to Z transform for second order lag.

Started by Peter Nachtwey May 15, 2004
"Gary Schnabl" <LivernoisYards@comcast.net> wrote in message
news:hdadnQpodPAgYDrdRVn-gg@comcast.com...
> Might you be from Milwaukee? > > Gary > > "Peter Nachtwey" <pnachtwey@comcast.net> wrote in message > news:-YadnbZb-erSfDrd4p2dnA@comcast.com... > > I have a very good control book with Laplace to z transform tables
called
> > "Digital Control System Analysis and Design" by Charles L Phillips and
H.
> > Troy Nagle. Another book I have with about the same table is "Control > > Strategies for Dynamic Systems" by John H Lumkes who as a professor at > MSOE. > >
No, I got the book and went to one of John Lumkes' seminars at a IPFE show in Las Vegas. I have visited Milwaukee twice. Peter Nachtwey
I was born and educated there. Your surname is German-enough (night way?) to
be from Milwaukee.

Gary

"Peter Nachtwey" <pnachtwey@comcast.net> wrote in message
news:_42dnSiyB_KcnDXdRVn-sw@comcast.com...
> No, I got the book and went to one of John Lumkes' seminars at a IPFE
show
> in Las Vegas. I have visited Milwaukee twice. > > Peter Nachtwey
>Peter Nachtwey wrote: > > >For a plant who's transfer function is T(s) = a/(s+a) you get: > >T_z(s) = (1-e^{T s})/s * a/(s+a). > >Do the partial-fraction expansion on this to get: > >T_z(s) = (1-e^{-T*s}) * (a/s - a/(s+a)). >
Many many years later - Most likely a typo. The partial fraction expansion should be: T_z(s) = (1-e^{-T*s}) * (1/s - 1/(s+a)). _____________________________ Posted through www.DSPRelated.com