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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@15454 f3b2605a-c512-4ea7-a41b-209d697bcdaa

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sjplimp
2016-08-05 20:45:14 +00:00
parent 390b492d08
commit 30d6007565
6 changed files with 57 additions and 19 deletions
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9
doc/src/fix_controller.txt
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@ -19,7 +19,7 @@ alpha = coupling constant for PID equation (see units discussion below) :l
Kp = proportional gain in PID equation (unitless) :l
Ki = integral gain in PID equation (unitless) :l
Kd = derivative gain in PID equation (unitless) :l
pvar = process variable of form c_ID, c_ID\[N\], f_ID, f_ID\[N\], or v_name :l
pvar = process variable of form c_ID, c_ID\[I\], f_ID, f_ID\[I\], or v_name :l
c_ID = global scalar calculated by a compute with ID
c_ID\[I\] = Ith component of global vector calculated by a compute with ID
f_ID = global scalar calculated by a fix with ID
@ -113,9 +113,10 @@ feedback is sufficient, and so {Ki}={Kd}=0 can be used. In cases where
there is a substantial lag time in the response of {pvar} to a change
in {cvar}, this can be counteracted by increasing {Kd}. In situations
where {pvar} plateaus without reaching {setpoint}, this can be
counteracted by increasing {Ki}. In the language of Charles Dickens
(or Donald Trump), {Kp} represents the error of the present, {Ki} the
error of the past, and {Kd} the error yet to come.
counteracted by increasing {Ki}. In the language of Charles Dickens,
{Kp} represents the error of the present, {Ki} the error of the past,
and {Kd} the error yet to come. (insert your own Donald Trump joke
here)
Because this fix updates {cvar}, but does not initialize its value,
the initial value is that assigned by the user in the input script via