29th July 2008

Why do we bother with the root locus?

I’ve been taught the root locus twice and still find it to be more trouble than it’s worth.  For a simple gain I can use the Routh Array instead of the root locus.  The Routh Array allows me to determine the bounds of a stable gain faster than a root locus.

Technically, the root locus can be used to more than finding gains but you already have to have some idea of the controller form.  If I know the controller form then the pole placement instead of the root locus.

There’s no such thing as too many tools.  But I’ve never used the root locus and I wonder does anyone else?

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