Essay On James Watt's Flyball Governor

Introduction:
Preface:
The use of feedback control comes from a very historical background. However in 1760, the introduction of "James Watt's flyball governor" for steam engine's speed regulation laid the foundation of mathematics for control systems design and description analysis. In 1868, "James Clerk Maxwell" carried out the mathematical model analysis of the "Governor". In 19th century, the introduction of different mathematical modeling methods like Euler, Laplace, Fourier made quite an impact on the practice of Control Systems studies. Remarkable progress was also made in the 20th century when "Nicholas Minorsky" flourished the automatic controllers for Ship Maneuvering. Later on Integral and Derivative Control concepts were also established by him. Concurrently, Nyquist introduced the

But since World War II, the nonlinear methodologies of control systems have attracted the researchers because of many certain reasons. One of the major reasons in the goodwill of non-linear control studies is the large operational range of non-linear controllers which on the other hand, linear controller fails to provide [1]. While doing linear analysis, many non-linear aspects and behaviors of the system are not accounted for, this results in the reduction of controller accuracy. Another important reason lies in the fact that while doing linear analysis, linear approximation of the system is considered. However the discontinuous nature of many non-linearities like Coulomb friction, saturation, dead-zones, backlash, hysteresis etc doesn't permit the linear approximation. So the effects of such undesirable behavior caused by these non-linearities must be accounted for. Design simplicity is another important aspect that non-linear control offers. A good non-linear control design offers more intuitive approach than its linear part