December 2002
Intermediate to advanced
800 pages
18h 7m
English
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14.9. Summary
Transmission zeros are the multivariable equivalent of SISO transfer function zeros. RHP (positive) transmission zeros indicate that the process inverse will be unstable. A transfer function matrix may have no individual transfer functions with RHP zeros, and yet have a RHP matrix transmission zero. Similarly, a transfer function matrix may have an element with a RHP zero, and yet have no RHP matrix transmission zeros. Processes with RHP transmission zeros have inherent closed-loop performance limitations; often there is not a significant advantage to full multivariable control (using decoupling or MV IMC) of these processes.
Multivariable processes exhibit a directional sensitivity, where two different input vector directions could ...
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