Abstract
Controlled plant stability always depends on some plant and controller parameters. If the dependency is not monotone, the system is denoted as conditionally stable. In this paper some basic parameters, such as the gain or the time delay, are considered to determine the linear time invariant plant stability by using frequency domain criteria. Also, a plant performance such as the phase margin is used for the same purpose. Even the sampling period, in some sampled data controlled plants, may characterize the stability condition. In this paper, the requirements to present a conditional stability in controlled plants are outlined. Some examples and a practical application related to a networked control of a resonant flexible manipulator are used to illustrate the results.
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