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8. Stability
Stability plays a fundamental role in control theory, because only stable systems are useful. Basically, when a stable system is disturbed, it returns to its equilibrium state, whereas an unstable system amplifies the disturbance. Most closed-loop systems become unstable when we seek to increase gain to achieve high performance. Thus, stability sets an upper bound on looping. Unstable systems are difficult to control, and one possible strategy is pole-zero simplification.
Consider the linear system :
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Stability
Poles and zeros
References
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Software
There are many different types of control software. Many of them are specific to a certain application, a certain field, such as the aerospace industry. Most of them are commercial and therefore not free.
The most widely used software packages are MATLAB → with a large number of toolboxes covering the majority of design, simulation and implementation methods...
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