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Control theory is a relatively new field in engineering when compared with core topics, such as statics, dynamics, thermodynamics, etc Early examples of control systems were developed actually before the science was fully understood For example the fly?ball governor developed by James Watt to control
Convenient (room temperature control, laundry machine) Dangerous (hot/cold places, space, bomb removal) Impossible for human (nanometer scale precision positioning, work inside the small space that human cannot enter) It exists in nature (human body temperature control) Lower cost, high efficiency, etc Many examples of control systems around us
The modern trend in engineering control systems is toward greater complexity due to the requirements of complex tasks and good accuracy Modern complex systems may have many inputs and many outputs linear or nonlinear systems, to analyze such systems it is essential to reduce the complexity of the mathematical expressions