《The Fundamentals of Control Theory》读书笔记

• Overview

  As an engineer, it is crucial that you are able to describe your system in an efficient and useful manner.
  

• Definations

• The best reason to learn control theory

  The best reason to learn control theory is that it is the glue that combines all other engineering fields and by understanding the fundamentals of control theory it opens the door for you to understand all of those other fileds at a more basic level.

• Control System Theory

  The Control System Theory is building models of your system and simulating it to make predictions, it’s understanding the dynamics and how they interact with the rest of the system, it’s filtering out noise and rejecting outside disturbances, it’s designing or selecting proper sensors and actuators, and it’s testing your system to ensure it’ll perform as expected in an unexpected environment.

• System

  A system is a collection of interconnected parts that form a larger more complex whole.

• Control system

  A control system is a mechanism that alters the behavior (or the future state) of a system.

• The Three Different Problems

  1. The system identification problem

     Determining the mathematical model of your system is done through a process called system identification. There are two ways: black box method, white box method;

  2. The simulation problem

     The simulation problem is predicting how your outputs change given a known set of inputs and the mathematical model of the system.

  3. The control problem

     How do we generate the appropriate system input that will produce the desired output.

• Concepts

  The actuators are driven by an actuating signal that is generated by the controller.

• Process

  We’ll refer to the system that is being controlled as the process.

• Actuator

  An actuator is a generic term that refers to a device or motor that is responsible for controlling a system.

• Plant

  It can be useful to refer to the collection of both process and actuators as a single system that we’ll call the plant.

• Open-loop

  This type of control system is referred to as open-loop since the inputs into the controller are not fed back from the output of the process.

• Closed-loop

  The beauty of the feedback control system - or a closed-loop control system is that it is able to react to changes to the controlled variable automatically by constantly driving the error term to zero.

• Timer vs. Clock

  A timer is a device for measuring how much time has elapsed over some interval, whereas a clock’s measurement is related back to the time of day.

• Float regulator

  

• Mathematically descripition

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