Feedback Control Systems Modelling and Analysis

A control system is a device, or set of devices to manage, command, direct or regulate the behavior of other devices or system.  There are two common classes of control systems, with many variations and combinations: logic or sequential controls, and feedback or linear controls. 

Linear control systems use linear negative feedback to produce a control signal mathematically based on other variables, with a view to maintain the controlled process within an acceptable operating range.
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