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Controls Functions

DADiSP/Controls includes over 40 standalone functions. The following table is a summary of each function.

Analysis and Simulation

bode Produce Bode magnitude and phase plots
nyquist Generate Nyquist Plot
fstats Calculate frequency response characteristics from Bode plot
dbode Generate Bode plots for a discrete system
dnyquist Produce Nyquist plot for a discrete system
dfstats Calculate frequency response characteristics from discrete Bode plot
setfunit Set units to be used by frequency response macros
pzmap Plot pole and zero locations in the complex plane
rtlocus Generate Root Locus Plot
pzgrid Overlay a grid of constant natural frequencies and damping ratios
dpzmap Plot location of the poles and zeros of a discrete system
drtlocus Generate Root Locus Plot for a discrete system
dpzgrid Overlay a grid of constant discrete natural frequencies and damping ratios
cimpulse Calculate impulse response of a continuous system
cstep Evaluate step response of a continuous system
cramp Calculate response of a continuous system to ramp input
csim Calculate response of a continuous system to specified input
csiminit Calculate response of a continuous system to specified input and initial conditions
dimpulse Calculate impulse response of a discrete system
dstep Evaluate step response of a discrete system
dramp Calculate response of a discrete system to ramp input
dsim Calculate response of a discrete system to specified input
dsiminit Calculate response of a discrete system to specified input and initial conditions
tstats Calculate performance characteristics from continuous or discrete step response plot


Model Transformations

connect Produce one composite model from two smaller ones
cloop Transform open-loop model into its closed-loop equivalent
cloopf Produce closed-loop transfer fcn for a system with open-loop & feedback dynamics
delay Model a simple delay in a continuous system
delay2 Model a delay in a continuous system with a higher order approximation
c2disc Produce discrete model: take Z-transform with zero order hold of the continuous system
c2dbil Produce the bilinear discrete equivalent of a continuous system
c2dback Calculate discrete equivalent via the backward integration method
c2delayY Produce discrete model: take Z-transform with zero order hold with processing delay
dcgain Calculate DC gain of a continuous system
cresolv Produce the resolvant matrix of a continuous system
d2cont Perform inverse Z-transform with zero order hold to produce the continuous model
d2cbil Produce inverse of the bilinear transform to convert discrete model to continuous equivalent
d2cback Transform discrete transfer function to continuous equivalent via the inverse of the backward integration method


Off the Shelf Controllers

pid Design a proportional plus integral plus derivative controller
pi Design a proportional plus integral controller
pd Design a proportional plus derivative controller
lagleadm Design a lag or lead compensator
dpid Design a discrete proportional plus integral plus derivative controller
dpi Design a discrete proportional plus integral controller
dpd Design a discrete proportional plus derivative controller compensator
dlagleadm Design the discrete equivalent of a continuous lag or lead
dsgn2ordm Design a 2nd order continuous system


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