Transcription of Chapter 12
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Chapter 12
1 Chapter 12 Fig. Unit-step disturbance responses for the candidate controllers (FOPTD Model: K = 1, 4, 20).==Controller Tuning: A Motivational Example2 Chapter 12 PID Controller Design, Tuning, and TroubleshootingPerformance Criteria For Closed-Loop Systems The function of a feedback control system is to ensure that the closed loop system has desirable dynamic and steady-state response characteristics. Ideally, we would like the closed-loop system to satisfy the following performance closed-loop system must be effects of disturbances are minimized, providing good disturbance , smooth responses to set-point changes are obtained, that is, good set-point error (offset) is control action is control system is robust, that is, insensitive to changes in process conditions and to inaccuracies i
Chapter 12 Tuning for Lag-Dominant Models • First- or second-order models with relatively small time delays are referred to as lag-dominant models. • The IMC and DS methods provide satisfactory set-point responses, but very slow disturbance responses, because the value of …
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