02-02-2013, 01:02 PM
Biological Control System BMT 437
Biological Control.PPT (Size: 6.73 MB / Downloads: 224)
Course Synopsis
Provides a background of control principles in various engineering applications. Basic mathematical tools such as Laplace transform, transfer function, block diagram, signal flow graph, mathematical modeling of dynamic systems, time response analysis, stability of linear system, root locus and frequency domain analysis are utilized.
System Variables
The system’s boundary depends upon the defined objective function of the system.
The system’s function is expressed in terms of measured output variables.
The system’s operation is manipulated through control input variables.
The system’s operation is also affected in an uncontrolled manner through disturbance input variables.
Control System
Control is the process of causing a system variable to conform to some desired value.
Manual control Automatic control (involving machines only).
A control system is an interconnection of components forming a system configuration that will provide a desired system response.
Temperature Control
Figure shows a schematic diagram of temperature control of an electric furnace. The temperature in the electric furnace is measured by a thermometer, which is analog device. The analog temperature is converted to a digital temperature by an A/D converter. The digital temperature is fed to a controller through an interface. This digital temperature is compared with the programmed input temperature, and if there is any error , the controller sends out a signal to the heater, through an interface, amplifier and relay to bring the furnace temperature to a desired value.