4.5 Summary
Based on the preceding analysis, it is clear that the IHC
and SFSCF methods are essentially the same, even as
the design formalism is different. Similarly, the remaining
three methods can be parameterized such that they
yield similar performance, with some differences in the
robustness as was pointed out. However, finding such a
parameterization is not a trivial task; hence, they can
and should be considered as different methods, with
different attributes. The main features of the controllers
studied in the preceding sections are collected in
Tables 2–6.
It is apparent that the choice of a suitable controller
is problem dependent, as none of the studied controllers
has the best performance in all scenarios. The applicability
of the controllers in certain cases is summarized
in the remainder of this section.
The FSCF method is a rather high-order controller
with a high number of free design parameters. The
method has superb robustness to modeling errors,
while providing high vibration mitigation. The major
drawbacks are the poor convergence in MIMO systems
and low stability margins in scenarios with multiple
disturbance tones. The method is the best applicable
4.5 SummaryBased on the preceding analysis, it is clear that the IHCand SFSCF methods are essentially the same, even asthe design formalism is different. Similarly, the remainingthree methods can be parameterized such that theyyield similar performance, with some differences in therobustness as was pointed out. However, finding such aparameterization is not a trivial task; hence, they canand should be considered as different methods, withdifferent attributes. The main features of the controllersstudied in the preceding sections are collected inTables 2–6.It is apparent that the choice of a suitable controlleris problem dependent, as none of the studied controllershas the best performance in all scenarios. The applicabilityof the controllers in certain cases is summarizedin the remainder of this section.The FSCF method is a rather high-order controllerwith a high number of free design parameters. Themethod has superb robustness to modeling errors,while providing high vibration mitigation. The majordrawbacks are the poor convergence in MIMO systemsand low stability margins in scenarios with multipledisturbance tones. The method is the best applicable
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