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DynamicSystems[NyquistPlot] - plot frequency response in complex plane

Calling Sequence

NyquistPlot(sys, opts)

Parameters

sys

-

System; system object to plot

opts

-

(optional) equation(s) of the form option = value; specify options for the NyquistPlot command

Description

• 

The NyquistPlot command plots, in the complex plane, the frequency response of the transfer functions of the subsystems of sys, a system object.

• 

If sys is a continuous system, its s-domain transfer function is computed and then converted to the real frequency domain using the transformation s -> I*omega, where omega is the angular frequency.

• 

If sys is a discrete system, its z-domain transfer function is computed and then converted to the real frequency domain using the transformation z -> exp(I*omega*Ts), where omega is the angular frequency and Ts is the sample time.

• 

The NyquistPlot command takes all standard plot,options.

Examples

withDynamicSystems:

sys:=ZeroPoleGain0,1,2,4,6,1:

NyquistPlotsys

tx1:=ss+1+I10s+1I10:

tx2:=1s+1:

tx3:=1s+1I10s+1+I10:

tx4:=1s10:

sys:=TransferFunctiontx1|tx2,tx3|tx4:

sys:-tf

ss2+2s+1011s+11s2+2s+1011s10

(1)

This is the command to create the 2-D plot from the Plotting Guide.

NyquistPlotsys,color=red,green,blue,brown,title=Nyquist Plot

See Also

DynamicSystems, DynamicSystems[BodePlot], DynamicSystems[MagnitudePlot], DynamicSystems[PhasePlot], DynamicSystems[SystemObject]


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