A. K. Mahalanobis

Bio: A. K. Mahalanobis is an academic researcher from University of Calcutta. The author has contributed to research in topics: Hysteresis & Compensation principle. The author has an hindex of 1, co-authored 1 publications receiving 3 citations.

On the Compensation of Hysteresis Effects in Relay Control Systems by using Positive Hysteresis

Abstract: In this paper a technique for the compensation of the hysteresis effects in relay control systems using positive hysteresis non-linearity has been suggested. The instrumentation of these positive hysteresis characteristics with simple analogue computer components has been shown. An alternative compensation principle for relay control systems has also been proposed. The effectiveness of these compensation schemes has been observed with relay control systems set up in an analogue computer.

A nonlinear compensation technique for systems involving hysteresis

Abstract: This paper presents a simple procedure using a non-linear compensator for eliminating limit cycles in control systems arising due to hysteresis in contactors or due to backlash. The method consists of 1) the insertion of an element of gain Ksgn(z) or K[sgn(z')+1]/2 , and 2) the switching of this element by simple processing of the input and output signals of the original nonlinearity. For a contactor, the technique effectively removes the hysteresis but does not alter the dead zone (which, it is pointed out in one instance, might be an advantage) or, of more importance, the bang-bang characteristic of the element. Furthermore, for the contactors, the compensation technique is found effective irrespective of the waveshape at the nonlinearity input and, therefore, is of some general consequence in design.

On-Off Element with Generalized Characteristics

Abstract: An on-off element with positive and negative variable triggering levels, magnitudes, and hysteresis is presented. It contains supplementary polarized Schmitt triggers and logic sequential devices built from discrete transistors and components or integrated circuits. Using this on-off element, it may be obtained in practice, all types of theoretic symmetrical and asymmetrical characteristics, inclusively that of an ideal on-off element, their totality being represented by a generalized characteristic. Depending on the hysteresis polarity, several types of peculiar generalized characteristics are distinguished. From each of them considering the triggering levels, the magnitudes and the hysteresis as variables, more peculiarized characteristics result. An example illustrates the application of the on-off element with generalized characteristic to a relay control system, in order to improve its stability and dynamic response.