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The landmark book of Hsue-Shen Tsien, ‘Engineering Cybernetics’, gave birth 60 years ago to an engineering science of interrelations and synthetic behaviors. Clothing the bare bones of Norbert Wiener’s conception of cybernetics, the book delineates for the new science the requirement (of having direct impacts on engineering applications), the aim (of encapsulating engineering principles and concepts),...
Critical to the progress in any branch of science, automatic control included, is the perpetual reflection on the basic conceptions and assumptions. As researchers of automatic control on both sides of the Pacific Ocean take note of the past achievements, current challenges, and future opportunities, it is imperative that we once again return to the roots, to reconnect to the “empirical force”, as...
A novel double-loop feedback control strategy of DVR based on proportional-resonant control is proposed. Compared with the traditional proportional-integral (PI) controller, the proportional-resonant controller applied to the output compensation voltage control strategy of DVR, can achieve tracking with zero static error for the reference signals of compensation voltage. Based on frequency characteristic...
This is a brief survey of a little known field of disturbance estimation and subsequent cancellation, a field with a long history and is still rather disorganized. Researchers and results are scattered over almost two centuries, across East and West: from Jean-Victor Poncelet's Principle of Invariance in 1829, to Jingqing Han's conception of Active Disturbance Rejection in 1995 and beyond. But the...
The question addressed in this paper is: just what do we need to know about a process in order to control it? With active disturbance rejection, perhaps we don't need to know as much as we were told. In fact, it is shown that the unknown dynamics and disturbance can be actively estimated and compensated in real time and this makes the feedback control more robust and less dependent on the detailed...
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