Appearance of ungovernable and/or unobservable modes
Controllability and observability of uncertain linear time-invariant systems

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Appearance of ungovernable and/or unobservable modes
Controllability and observability of uncertain linear time-invariant systems

Author : Jean-Marc BIANNIC

Review date: April 26, 2021 | Lire en français

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2. Appearance of ungovernable and/or unobservable modes

2.1 Single-input, single-output systems

In the previous introductory example, the appearance of an ungovernable (or unobservable) mode was linked to a simplification phenomenon between pole and zero of the cascaded subsystems, as can be seen by rewriting the transfer function of the S 1 subsystem in the form :

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