Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question dated 2020-07-21
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Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-07-21: Discussion question: 183. What are the characteristics of a feedforward control system?
1. Feedforward control operates on the principle of invariance, and is more timely and effective than feedback control； 2. Feedforward control belongs to the “open-loop” control system ； 3. Feedforward control uses a “specialized” controller determined by the characteristics of the object, also known as a feedforward compensation device ； 4. A feedback mechanism can only overcome one type of interference.
(1) Feedforward control operates on the principle of invariance, and is more timely and effective than feedback control； (2) Feedforward control belongs to the “open-loop” control system ； (3) Feedforward control uses a “dedicated” controller determined based on the characteristics of the object, also known as a feedforward compensation device ； (4) A feedforward action can only overcome one type of interference.
(1) Feedforward control operates on the principle of invariance, and is more timely and effective than feedback control； (2) Feedforward control belongs to the “open-loop” control system ； (3) Feedforward control uses a “dedicated” controller determined based on the characteristics of the object, also known as a feedforward compensation device ； (4) A feedforward action can only overcome one type of interference.
1. Adjustment is timely, giving the system good responsiveness. Bai 2. A single feedforward channel can only compensate for one specific type of disturbance, and it is not capable of overcoming the impact of all disturbance signals on the controlled variable.
1. Rapid adjustment. 2. It is an open-loop system without feedback. 3. The design of a feedforward controller is more complex than that of a feedback controller.
1. Feedforward control based on interference； 2. Feedforward is open-loop control ； 3. “Specialized” control designed for the object’s characteristics in the feedforward control room.
Main characteristics of feedforward control systems: (1) Feedforward control operates on the principle of invariance, and is more timely and effective than feedback control； (2) Feedforward control belongs to the “open-loop” control system ； (3) Feedforward control uses a “dedicated” controller determined based on the characteristics of the object, also known as a feedforward compensation device ； (4) A feedforward action can only overcome one type of interference.
It avoids the fluctuations and time lags caused by negative feedback, is predictive, and enables timely responses.
(1) Feedforward control operates on the principle of invariance, and is more timely and effective than feedback control； (2) Feedforward control belongs to the “open-loop” control system ； (3) Feedforward control uses a “dedicated” controller determined based on the characteristics of the object, also known as a feedforward compensation device ； (4) A feedforward action can only overcome one type of interference.
(1) Feedforward control operates on the principle of invariance, and is more timely and effective than feedback control； (2) Feedforward control belongs to the “open-loop” control system ； (3) Feedforward control uses a “dedicated” controller determined based on the characteristics of the object, also known as a feedforward compensation device ； (4) A feedforward action can only overcome one type of interference.