## Homework 9, due April 7, 2010.

Due Wednesday, April 7, 2010.
goodwine
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### Homework 9, due April 7, 2010.

From the course text, 9.15, 9.16, 9.17, 9.26 and 9.30.
Bill Goodwine, 376 Fitzpatrick
cplagema

### Re: #9.17

For 9.17, since the transfer function is for Xdot/F instead of X/F, does "proportional control" still refer to F=Kp*(Xdot_desired - Xdot), or now is it Kp*(X_desired - Xdot), which is really derivative control for X/F?
Thanks!
goodwine
Posts: 1596
Joined: Tue Aug 24, 2004 4:54 pm
Location: 376 Fitzpatrick
Contact:

### Re: #9.17

cplagema wrote:For 9.17, since the transfer function is for Xdot/F instead of X/F, does "proportional control" still refer to F=Kp*(Xdot_desired - Xdot), or now is it Kp*(X_desired - Xdot), which is really derivative control for X/F?
Thanks!
It's the former, F=Kp*(Xdot_desired - Xdot).
Bill Goodwine, 376 Fitzpatrick
AL089

### Re: Homework 9, due April 7, 2010.

Professor, just a heads up but Figures 9.98 and 9.99 are pretty faded and don't show all the branches and asymptotes of the root locus, at least in my copy. It's not hard to get what the real plots look like, but it might be confusing if somebody doesn't realize that parts are missing. Again, it might only be my book.
lawnoy

### Re: Homework 9, due April 7, 2010.

Professor,

Shouldn't the expression for rise time in 9.26 be tr=1.8/wd? All the expressions of rise time in the book are in terms of damped frequency.
goodwine