Decoupling Controller Design Based on Gain and Phase Margin Specifications for a Coupled Tank System Model

The objective of a multi-variable control involves maintaining various control variables at independent set points. The interactions present in the system affects more than one controlled variables because of the manipulated variable. Decouplers are designed to reduce the interactions in between the loops in to achieve a satisfactory responses when there is presence of non-minimum phase zeros,multiple time delays and large uncertainty. The dynamic and static decoupling are the two types of decoupling strategies. In this thesis, these control strategies are discussed. In practice, there exists certain process unmodelled dynamics. Hence, there is a necessity to examine the robust stability of a system to check whether the control system stability is ascertained in presence of these unmodelled dynamics. This thesis deals with designing a controller along with decoupler to achieve the desired performance of a TITO system. At first, a decoupler is being designed from the plant matrix. Then, a first order plus dead time model is obtained for each of the decoupled process on the basis of the frequency response fitting. After getting the FOPDT model a decentralized PI/PID controller for each reduced order decoupled model is designed to obtain desired gain and phase margins. The present technique is applied to a coupled tank system. The characteristics like non-minimum phase and non-linear characteristics make the control of coupled tank liquid level system, a standout amongst the most difficult benchmark control problems. The main objective of the coupled tank system is to maintain a desired level of liquid in the two tanks independent of each other when the water enters the tank and when the water flows out. The coupling impact here in this framework is a coupling switch that permits stream of water in the tank at higher level to a tank at lower level. Lastly, robust stability of the control system is analyzed in the presence of various process uncertainties like additive uncertainty and multiplicative uncertainties. The stability analysis is examined using the small gain theorem or the spectral radius criterion. The robust stability of the coupled tank system is also determined

Revisiting R.K. Narayan’s the guide on silver screen

It is evident that an adaptation can be original or unoriginal but its presence is inarguable. Therefore this study does not make an attempt to see why a novel is adapted for cinematic projection, but tries to assess how effectively the adaptation is done. It is clear that the investigation is biased by both the eye and the eyepiece. R.K. Narayan adopts the individual as his reference and looks inward, affecting a microcosmic view of society and its problems. He showcases the idiosyncrasies of the characters and superimposes them on one another to come up with a layered structure of societal inconsistency and prejudice. On the other hand, Vijay Anand is inclined towards a top-down approach, treating issues and personalities first and then individuals and specific problems. For this purpose, this paper focuses on a famous work, ‘Guide’, by R. K. Narayan) and its adaptation for the movie Guide. It also examines how the film is different from its original source and how far a novel is adapted for cinematic projection, but tries to assess how the changes in the adaptation connote different insinuations and subtleties. It also explores how far the changes are independent of its original source and discusses the impact of these cinematic changes

Scientometric profile of ‘genetics and heredity’ research in India

196-206An analysis of 2899 papers published by Indian scientists during 1991-2008 and indexed by Science Citation Index- Expanded (SCI-E) indicates that the growth of publication output was slow in the initial stages, which started increasing after 2000. The highest output was in the sub-field of molecular genetics. The organisms which received the maximum priority were humans, plants, and animals. A significant proportion of papers were published in journals that originated from the advanced countries of the West and in journals with impact factor >1. About 47% papers were cited more than 5 times. Academic institutions contributed the highest number of papers but had less impact as compared to other performing sectors. The papers published by Indian Council of Agriculture Research had the lowest impact. Among the institutions, Madras University had the highest impact, while Indian Veterinary Research Institute had the lowest impact