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Gene F. Franklin (July 25, 1927 – August 9, 2012) was an American electrical engineer and control theorist known for his pioneering work towards the advancement of the control systems engineering – a subfield of electrical engineering.
The Nyquist plot for () = + + with s = jω.. In control theory and stability theory, the Nyquist stability criterion or Strecker–Nyquist stability criterion, independently discovered by the German electrical engineer Felix Strecker [] at Siemens in 1930 [1] [2] [3] and the Swedish-American electrical engineer Harry Nyquist at Bell Telephone Laboratories in 1932, [4] is a graphical technique ...
"The origins of feedback control." Scientific American 223.4 (1970): 110–119. Mayr, Otto. "Adam Smith and the concept of the feedback system: Economic thought and technology in 18th-century Britain." Technology and culture (1971): 1-22. (Explanation of simultaneous emergence of feedback systems in technology and economic thought in 18th ...
Control systems that include some sensing of the results they are trying to achieve are making use of feedback and can adapt to varying circumstances to some extent. Open-loop control systems do not make use of feedback, and run only in pre-arranged ways. Closed-loop controllers have the following advantages over open-loop controllers:
A plant in control theory is the combination of process and actuator.A plant is often referred to with a transfer function (commonly in the s-domain) which indicates the relation between an input signal and the output signal of a system without feedback, commonly determined by physical properties of the system.
The definition of a closed loop control system according to the British Standards Institution is "a control system possessing monitoring feedback, the deviation signal formed as a result of this feedback being used to control the action of a final control element in such a way as to tend to reduce the deviation to zero." [4]
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Classical control theory is a branch of control theory that deals with the behavior of dynamical systems with inputs, and how their behavior is modified by feedback, using the Laplace transform as a basic tool to model such systems.