(SoE) School of Engineering

<p>Shiv Nadar University is a comprehensive, multidisciplinary, research-focused, and student-centric University offering a full range of academic programs at the undergraduate, postgraduate and doctoral level. With state-of-the-art infrastructure, the University comprises of academic wings, sophisticated labs, international standard sports facilities, amphitheaters, auditorium, conference rooms and smart classrooms. The University&rsquo;s goal is to become internationally recognized for the quality of its research and creative endeavors and their applicability to improving quality of life, generating new insights and expanding the boundaries of human knowledge creativity. Committed to excellence in teaching, research and service, the University aims to serve the higher education needs of India and the world beyond.</p>

Shiv Nadar University

An algorithm for the trajectory control of robot manipulators by decentralized feedback is proposed. A decentralized model following controller is used that bypasses the complexities posed by the nonlinear, uncertain dynamics of manipulator, dealing instead with the simpler actuator dynamics and treating the joint torques as disturbances. The controller is simple, computationally easy, and robust to parametric uncertainties and payload variations.

World University root node

Electrical Engineering

DECENTRALISED VARIABLE STRUCTURE MODEL FOLLOWING CONTROLLER FOR ROBOT MANIPULATORS.

In this paper we present an algorithm for hidden surface removal for a class of polyhedral surfaces which have a property that they can be ordered relatively quickly like the terrain maps. A distinguishing feature of this algorithm is that its running time is sensitive to the actual size of the visible image rather than the total number of intersections in the image plane which can be much larger than the visible image. The time complexity of this algorithm is O((k +n) log n log log n) where n and k are respectively the input and the output sizes. Thus, in a significant number of situations this will be faster than the worst case optimal algorithms which have running time Ω(n2) irrespective of the output size (where as the output size k is O(n2) only in the worst case). We also present a parallel algorithm based on a similar approach which runs in time O(log4(n+k)) using O((n + k)/log(n+k)) processors in a CREW PRAM model. All our bounds are obtained using ammortized analysis. © 1988 ACM.

Proceedings of the 4th Annual Symposium on Computational Geometry, SCG 1988

An efficient output-sensitive hidden-surface removal algorithm and its parallelization

A simple approach for designing decentralized regulators for interconnected systems via an aggregation technique based on scalar Lyapunov functions is presented in this paper. The proposed method is illustrated through an example of two-area power system.

Journal of the Institution of Engineers (India): Electrical Engineering Division

DECENTRALIZED STABILIZATION OF INTERCONNECTED SYSTEMS.

The design problem of an optimal deadbeat state observer for discrete-time systems has been discussed in this paper. The non-measurable states of the plant are reconstructed with a reduced-order dynamic observer. The problem of estimation is treated as a regulator problem wherein the quadratic performance index, which penalizes the error in estimation, is minimized in an average sense over a set of observer gain matrices which force observer poles to the origin. An efficient computational procedure based on direct cost optimization using gradient type algorithm is also reported. A case study of a boiling water reactor power plant has been presented to illustrate the usefulness of the proposed optimal deadbeat observer.

Journal of the Institution of Engineers. India. Electronics and telecommunication engineering division

DESIGN OF AN OPTIMAL DEADBEAT REDUCED-ORDER OBSERVER FOR A NUCLEAR BOILING WATER REACTOR.

Application of optimal control theory to a pressurised water reactor is the theme of this paper. The multi-input mathematical model of the H.B. Robinson pressurised water reactor plant, reported by Kerlin et al is simplified to a single-input one. The optimal control problem of the linear model is treated as a regulator problem wherein the given quadratic index of performance including a sensitivity term is minimised in an average sense. An efficient computational procedure based on direct cost optimization using a gradient type algorithm is also reported. Copyright © 1987 by The Institute of Electrical and Electronics Engineers, Inc.

IEEE Transactions on Nuclear Science

Sensitivity-Reduced design for a nuclear pressurized water reactor

Chemical Engineering

International Communications in Heat and Mass Transfer

A note on 1-2 heat exchanger trouble shooting

A method is proposed for computing the upper hound on the local water temperature rise with respect to the hulk temperature in a spent fuel pool. The solution involves casting the continuity and momentum relationships in integral form in terms of the unknown velocity functions. The method of collocation is used to solve the problem. Computer application of this method shows it to he an efficient and cost-effective design tool. © 1986 Taylor and Francis Group, LLC.

Heat Transfer Engineering

Method for computing the maximum water temperature in a fuel pool containing spent nuclear fuel

International Journal of Heat and Mass Transfer

Mass transfer in a rotating disc oxygenator

Entrainment of liquid droplets in vapor or gas is frequently encountered in gas-liquid contactors and in vapor generators, such as reboilers, evaporators, trays of distillation column, etc. , due to an incomplete separation of the two phases when the vapor leaves the liquid. Entrainment lowers the efficiency of the equipment as well as the quality or purity of the product. The authors have done a dimensional analysis of the variables involved and carried out experiments to evolve a correlation. The dimensionless correlation so obtained is given.

Heat Transfer, Proceedings of the International Heat Transfer Conference

STUDY OF LIQUID ENTRAINMENT IN GAS-LIQUID CONTACTORS AND VAPOUR GENERATORS.

Given a sequence of numbers which can be mapped into an m multiplied by n array, sorting rows and columns is shown to yield an overall sorted sequence. This unusually simple procedure is shown to require O(log//2 m) iterations by analyzing the data movement in the array under successive row and column sorts. An efficient bubble sort network suitable for VLSI implementation, with near-optimal area-time**2 performance, is a direct application of the row-column sorting technique. The ease of implementation for practical VLSI chips is also demonstrated.