College of Engineering, Pune

About: College of Engineering, Pune is a based out in . It is known for research contribution in the topics: Sliding mode control & Control theory. The organization has 4264 authors who have published 3492 publications receiving 19371 citations. The organization is also known as: COEP.

Robust sliding mode control for a class of nonlinear systems using inertial delay control

Abstract: This paper proposes a robust sliding mode control strategy for an uncertain nonlinear system subjected to time-varying disturbance. The class of system considered includes state-dependent nonlinearity in the input vector (in addition to the plant matrix). The control scheme uses inertial delay control to estimate the lumped uncertainty. The proposed control enforces sliding without using the discontinuous control and without requiring the knowledge of uncertainties or their bounds. The overall stability of the system is proved. The effectiveness of the proposed strategy is verified for model following and robust performance, by simulation of an illustrative example and an application to inverted pendulum system.

A two-way FSI analysis of multiphase flow in hydrodynamic journal bearing with cavitation

Abstract: This work deals with a study of a three-dimensional CFD analysis and multi-phase flow phenomena for hydrodynamic journal bearing with integrated cavitation. The simulations are carried out considering the realistic bearing deformations by two-way fluid–structure interactions (FSI) along with cavitation using ANSYS®Workbench software. The design optimization module is used to generate the optimized solution of the attitude angle and eccentricity for the combination of operating speed and load. Bearings with and without cavitation are investigated. A drop in maximum pressure value is observed when cavitation is considered in the bearing. The rise in oil vapor distribution is noted with an increase in shaft speed which lowers the magnitude of the pressure build up in the bearing. The bearing deformations are analyzed numerically and found increasing with an increase in shaft speed. The experimental data obtained for pressure distribution showed good agreement with numerical data along with a considerable reduction in computation time.

Chaos in discrete fractional difference equations

Abstract: Recently, the discrete fractional calculus (DFC) is receiving attention due to its potential applications in the mathematical modelling of real-world phenomena with memory effects. In the present paper, the chaotic behaviour of fractional difference equations for the tent map, Gauss map and 2x(mod 1) map are studied numerically. We analyse the chaotic behaviour of these fractional difference equations and compare them with their integer counterparts. It is observed that fractional difference equations for the Gauss and tent maps are more stable compared to their integer-order version.