Control Systems Homework Help Tips: The Basics of Control Systems
What is a Control System?
A system is a combination of elements together in order to produce the desired output. Each and every element connected to form the system has its own impact on effect on the output. A control System is made up of a set of devices that commands, regulates or directs the behavior or functions of other devices in order to achieve a given result. Control systems have gained popularity in recent years. They now play a major role in the advancement of civilization and technology.
The main feature of every control system is the mathematical relationship between the input and output of the system. This relationship can be represented by linear proportionality. Such a system is known as a linear control system. Additionally, a system that cannot be represented by a single linear proportion or is related by a non-linear relation is called a non-linear control system.
What Makes Up A Good Control System?
- Accuracy – This can be defined as the measurement of tolerance of the instrument. Accuracy showcases the limits of the errors produced when the instrument is operating under normal conditions. An error detector and the use of feedback elements can be used to improve the levels of accuracy.
- Sensitivity – The change in surrounding conditions changes the parameters of a control system. Sensitivity is used to express this change. A good control system should be sensitive to input signals only and insensitive to such parameters.
- Stability – This is one of the most important characteristics of a control system. A bounded input system should produce a bounded output. In addition, a zero input produces a zero output. Such a system is said to be stable.
Other Requirements of a Good Control System
Types of Control Systems
Although there is a variety of control systems, all of them work to control the outputs. Some examples of control systems are those used for controlling acceleration, temperature, voltage, pressure temperature, current etc.
- Manual control system – Take an example of a temperature controller that is plugged to an electric power supply. The temperature of the room rises as long as the power is on. When the desired temperature is reached, the controller is switched off. One can manually control the temperature of the room. This is an example of a manual control system.
- Automatic control system – this is an improvement on the manual system. In the above example, a timer can be introduced in the temperature controller to switch it off and on in a predetermined interval. Additionally, a sensor can be added to measure the actual and the desired temperature. This is an automatic control system.
- Open-loop control system – In this system, the control action does not depend on the output. Examples include an electric hand drier, an automatic washing machine, and a bread toaster.
- Closed loop control system – This is a control system where the output is dependent on the input quantity. This means that the quantity of the input should be adjusted based on the output generated.
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