There are two major division in the control theory, classical and modern, which have direct implications over the control Engineering. The area of classical control theory is limited to single input and single output system design.
Modern control theory is carried out strictly in the complex or the frequency domain and can deal with the multi-output system.
So many parameters are considered in the design of the control system. Each and every control system are designed to achieve and perform the specific task. so to achieve that particular objective, a control system should satisfy the following requirement.
1. Stability
2. Bandwidth
3. Speed
4. Accuracy
5. Sensitivity
6. Disturbance
Stability:
In the initial condition system parameters do not result in large changes in the system behaviour. Stability is the important parameters of the transient response of a control system.A ideal control system is one which gives bonded output for bounded input. stability in the control system implies that small change in the system input.
Bandwidth:
Basically bandwidth of the control system defined the range of input of that particular system. output of a ideal control system should be consatnt and should give satisfactory output for the input frequency.
Speed:
speed of the control system refers the how fast the output of the system approaches to the required value. speed is measured in terms of the settling time and rise time. an ideal control system should have good speed.
Accuracy:
it just compare the input and the obtained output from the system, how much output is close to input or desire value. an ideal control system should be highly accurate.
Sensitivity:
It is an important parameter that must be considered in the system design. an ideal control system should be insensitive to the variations in the parameters of the system but it should be insensitive to the input command.
Disturbance:
almost all the control system are subjected to the some kind of unwanted or noise during the operation of control system. like wind gust, thermal noise, voltage is very common. therefore to avoid this problem , in the design of a control system, special attention and consideration must be given to the external disturnbance , so that the system is insensitive to noise and disturbance but must be sensitive to the input command.
Controller
Controller is a basic element of a control system which compare the actual value of the plant output with the reference input value to determine the error or deviation and produces proper corrective action taht will reduce the error to a smaller value or tends to zero.Generelly itis known as automatic controllers.
Types of control system:
Modern control theory is carried out strictly in the complex or the frequency domain and can deal with the multi-output system.
So many parameters are considered in the design of the control system. Each and every control system are designed to achieve and perform the specific task. so to achieve that particular objective, a control system should satisfy the following requirement.
1. Stability
2. Bandwidth
3. Speed
4. Accuracy
5. Sensitivity
6. Disturbance
Stability:
In the initial condition system parameters do not result in large changes in the system behaviour. Stability is the important parameters of the transient response of a control system.A ideal control system is one which gives bonded output for bounded input. stability in the control system implies that small change in the system input.
Bandwidth:
Basically bandwidth of the control system defined the range of input of that particular system. output of a ideal control system should be consatnt and should give satisfactory output for the input frequency.
Speed:
speed of the control system refers the how fast the output of the system approaches to the required value. speed is measured in terms of the settling time and rise time. an ideal control system should have good speed.
Accuracy:
it just compare the input and the obtained output from the system, how much output is close to input or desire value. an ideal control system should be highly accurate.
Sensitivity:
It is an important parameter that must be considered in the system design. an ideal control system should be insensitive to the variations in the parameters of the system but it should be insensitive to the input command.
Disturbance:
almost all the control system are subjected to the some kind of unwanted or noise during the operation of control system. like wind gust, thermal noise, voltage is very common. therefore to avoid this problem , in the design of a control system, special attention and consideration must be given to the external disturnbance , so that the system is insensitive to noise and disturbance but must be sensitive to the input command.
Controller
Controller is a basic element of a control system which compare the actual value of the plant output with the reference input value to determine the error or deviation and produces proper corrective action taht will reduce the error to a smaller value or tends to zero.Generelly itis known as automatic controllers.
Types of control system:
- Proportional controller
- Derivative controller
- Integral controller
- Proportional plus integeral controller
- Proportional plus differential controller
- Proportional plus differentila plus integral controller
- On-off controller
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