8
Concept of Stability and Routh-Hurwitz Criterion
8.1 CONCEPT OF STABILITY
System stability is one of the most important performance specification of a control system. A system is considered unstable if it does not return to its initial position but continues to oscillate after it is subjected to any change in input or is subjected to undesirable disturbance. For any time invariant control system to be stable the following two conditions need to be satisfied.
These are:
- The system will produce a bounded output for every bounded input;
- If there is no input, the output should tend to be zero, irrespective of any initial conditions.
Stability of a system may be referred to as absolute stability or in terms of relative stability. The term relative ...
Get Control Systems Engineering, 3rd Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.