A multiloop control system can be designed with the independent design method by assuming
trial controllers with design parameters and adjusting the design parameters so as to satisfy
stability and performance bounds. Various stability and performance bounds have been available
and were studied for less restrictive ones. On the other hand, little attention has been paid to
trial controllers even though they greatly affect the final control performances. Controllers with
one design parameter are the usual choice. Here, a one-parameter method for 2 × 2 multiloop
control systems is extended to higher dimensional processes in which the design parameter is
the time constant of the set point response of the paired output. Control performances are
compared with the well-known biggest log modulus tuning method and the sequential autotuning
method.
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