Transcription of Introduction to Control Systems • Absolute Stability ...
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MechatronicsControl SystemsK. Craig 1 Control Systems Introduction to Control Systems Absolute Stability Criteria System Performance Specifications Modes of ControlMechatronicsControl SystemsK. Craig 2 Introduction to Control SystemsEverything Needs Controlsfor Optimum Functioning! Process or Plant Process Inputs Manipulated Inputs Disturbance Inputs Response VariablesControl Systems are an integral partof the overall system and notafter-thought add-ons!Why Controls? Command Following Disturbance RejectionPlantManipulatedInputsDisturban ceInputsResponseVariablesMechatronicsCon trol SystemsK. Craig 3 Classification of Control System Types Open-Loop Basic Input-Compensated Feedforward Disturbance-Compensated Command-Compensated Closed-Loop (Feedback) Classical Root-Locus Frequency Response Modern (State-Space) Advanced , Adaptive, Nonlinear, Fuzzy LogicMechatronicsControl SystemsK.
Absolute Stability Criteria • If a system in equilibrium is momentarily excited by command and/or disturbance inputs and those inputs are then removed, the system must return to equilibrium if it is to be called absolutely stable. • If action persists indefinitely after excitation is removed, the system is judged absolutely unstable.
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