Sanjoy Mondal | Burdwan University (original) (raw)

Papers by Sanjoy Mondal

Transactions of the Indian National Academy of Engineering

Since the end of the year 2019, the whole world is experiencing a global emergency due to the COV... more Since the end of the year 2019, the whole world is experiencing a global emergency due to the COVID-19 pandemic. The major sectors including industry, economics, education have been affected. Ongoing pandemics confined us to avoid mass gathering and rigorously maintain social distancing to mitigate the spreading of this infectious disease. In this situation emerging technologies including the internet of things (IoT), Artificial Intelligence (AI) is playing a very important role in various fields such as healthcare, economics, educational system, and others to monitoring or tackle the impact of COVID-19 pandemic. Several papers discussed the impact of IoT on the COVID-19 pandemic in various aspects. However, the challenges and designing issues towards the implementation of IoT-based monitoring systems are not deeply investigated. Alongside, the adaptation of IoT and other technologies in the post-covid situation is not addressed properly. Our review article provides an up to date extensive survey on how IoT-enabled technologies are helping to combat the pandemic and to manage industry, education, economic, and medical system. As result, the realization is that IoT and other associated technologies have a great impact on virus detection, tracking, and mitigate the spread. In the face of an expeditiously spreading pandemic, the associated designing issues of the IoT-based framework have been looked into as a part of this review. Alongside, this review highlights the major challenges like privacy, security scalability, etc. facing in using such technologies. Finally, we explore 'The New Normal' and the use of technologies to help in the post-pandemic era.

2013 IEEE 8th Conference on Industrial Electronics and Applications (ICIEA), 2013

ABSTRACT In this paper, a second order sliding mode (SOSM) controller with asymptotic convergence... more ABSTRACT In this paper, a second order sliding mode (SOSM) controller with asymptotic convergence is proposed for stabilizing a vertical take-off and landing aircraft (VTOL) system affected by both matched and mismatched types of uncertainties. The proposed controller uses an adaptive gain tuning mechanism to design the sliding surface. Experimental results obtained by applying the adaptive SOSM to a laboratory model of VTOL system demonstrates the effectiveness of the proposed control scheme.

ISA Transactions, 2012

This paper proposes an adaptive second order sliding mode (SOSM) controller with a nonlinear slid... more This paper proposes an adaptive second order sliding mode (SOSM) controller with a nonlinear sliding surface. The nonlinear sliding surface consists of a gain matrix having a variable damping ratio. Initially the sliding surface uses a low value of damping ratio to get a quick system response. As the closed loop system approaches the desired reference, the value of the damping ratio gets increased with an aim to reducing the overshoot and the settling time. The time derivative of the control signal is used to design the controller. The actual control input obtained by integrating the derivative control signal is smooth and chattering free. The adaptive tuning law used by the proposed controller eliminates the need of prior knowledge about the upper bound of system uncertainties. Simulation results demonstrate the effectiveness of the proposed control strategy.

IEEE Access, 2022

In a 3L-VSI, to realize reference vector, maximum of six switching per sub-cycle are permitted. A... more In a 3L-VSI, to realize reference vector, maximum of six switching per sub-cycle are permitted. A similar condition is looked for in 3L-ZSI (z source inverter). The current continuous SVPWM methods of 3L-ZSI have adopted two approaches to meet the desired condition. These are a selection of sub-cycles generating six and eight switching employing correct volt-second balance. The sub-cycles generating eight switching has the demerit of increased losses. Here a new switching pattern has been proposed to optimize the number of switching. The dependency of the modulation index and sub-cycle duration on the switching frequency has also been discussed. With the increase in carrier frequency, the proposed PWM technique offers a decrease in switching losses compared to the existing ones. This leads to the improved efficiency of 3L-ZSI.To verify the efficacy of the proposed technique, simulation and prototype results are presented.

IFAC-PapersOnLine, 2016

Abstract: In this paper a distributed leader follower finite time tracking control of higher orde... more Abstract: In this paper a distributed leader follower finite time tracking control of higher order nonlinear multi agent systems (MAS) is presented subject to actuator saturation. A saturated continuous homogeneous consensus control is developed to obtain finite time convergence. For stability of the saturated actuators the geometric homogeneity theory is used and it is proven that all the states of the followers can converge to that of the leader in finite time. Switching control is designed based on super twisting algorithm to nullify the effect of uncertainties and external disturbances. It is also ensures that the sliding surface reaches the equilibrium in finite time. The control law can be effectively used for more general higher order nonlinear agent dynamics. Simulation results verify the effectiveness of the proposed scheme.

Studies in Systems, Decision and Control, 2016

This chapter presents a finite-time consensus problem of higher-order nonlinear multi-agent syste... more This chapter presents a finite-time consensus problem of higher-order nonlinear multi-agent systems (MAS) in the presence of bounded disturbances. The nominal control is designed by homogeneous finite-time technique to track the desired target trajectories. The chattering is mitigated by designing an integral sliding surface using adaptive super twisting algorithm (STA). The design parameters of super twisting controller are estimated adaptively without knowing the bounds a priori. The finite time convergence of the consensus protocol for the higher-order MAS is presented using Lyapunov analysis. Simulation results shows the effectiveness of the proposed homogeneous adaptive sliding mode control for the MAS.

2015 European Control Conference (ECC), 2015

In this paper a step by step adaptive super twisting controller is designed for second order nonl... more In this paper a step by step adaptive super twisting controller is designed for second order nonlinear strict feedback system with mismatched uncertainty. The design procedure is carried out by considering a virtual controller at each step. After obtaining the first step the desired dynamic model for each state is defined by the previous one and finally the actual control law is obtained. The design parameters of super twisting controller are estimated adaptively. The proposed method can be used for disturbance estimation also. The finite time convergence has been obtained by using a strict Lyapunov function. Simulation results demonstrate the efficacy of the proposed controller.

Lecture Notes in Electrical Engineering, 2015

ABSTRACT In this paper, an adaptive second-order terminal sliding-mode (SOTSM) controller is prop... more ABSTRACT In this paper, an adaptive second-order terminal sliding-mode (SOTSM) controller is proposed for controlling uncertain systems. The design procedure is carried out in two parts. A linear sliding surface is designed first, and then, using the linear sliding surface, the terminal sliding manifold is obtained. Instead of the normal control input, its time derivative is used by the proposed control law. The actual control is obtained by integrating the derivative control input. The discontinuous sign function is contained in the derivative of the control input, and hence, chattering is eliminated in the actual control. An adaptive tuning method is designed to deal with the unknown system uncertainties, and their upper bounds are not required to be known apriori. System stability is proved by using the Lyapunov criterion. Simulation results demonstrate the effectiveness of the proposed controller for both the single-input single-output (SISO) and multi-input multi-output (MIMO) uncertain systems.

2012 12th International Workshop on Variable Structure Systems, 2012

This paper proposes an adaptive second order sliding mode (SOSM) control strategy to tackle nonli... more This paper proposes an adaptive second order sliding mode (SOSM) control strategy to tackle nonlinear uncertain systems. For effective handling of the uncertain system, prior knowledge about the upper bound of the system uncertainty is a prerequisite for the sliding mode control (SMC). In order to remove this constraint, an adaptive tuning law based SMC was designed recently where the

2011 Annual IEEE India Conference, 2011

In this paper a twisting algorithm based second order sliding mode controller (SMC) is proposed t... more In this paper a twisting algorithm based second order sliding mode controller (SMC) is proposed to control a laboratory helicopter called the twin rotor multi-input multi-output (MIMO) system (TRMS). The TRMS model is pseudo decomposed into two subsystems and the coupling between them is considered as an uncertainty. A proportional integral based sliding surface is used for the vertical subsystem

2012 IEEE 7th International Conference on Industrial and Information Systems (ICIIS), 2012

ABSTRACT In this paper a second order sliding mode controller is proposed for controlling systems... more ABSTRACT In this paper a second order sliding mode controller is proposed for controlling systems with mismatched uncertainty. Stability of the system is guaranteed and the chattering in the control input is considerably reduced. Simulation results demonstrate the superiority of the proposed controller over the existing first order sliding mode controller designed to handle mismatched uncertainty.

ISA Transactions, 2013

In this paper, a chattering free adaptive sliding mode controller (SMC) is proposed for stabilizi... more In this paper, a chattering free adaptive sliding mode controller (SMC) is proposed for stabilizing a class of multi-input multi-output (MIMO) systems affected by both matched and mismatched types of uncertainties. The proposed controller uses a proportional plus integral sliding surface whose gain is adaptively tuned to prevent overestimation. A vertical takeoff and landing (VTOL) aircraft system is simulated to demonstrate the effectiveness of the proposed control scheme.

IET Control Theory & Applications, 2012

In this study, an adaptive second-order sliding mode (SOSM) controller is proposed to control a l... more In this study, an adaptive second-order sliding mode (SOSM) controller is proposed to control a laboratory helicopter called the twin-rotor multi-input-multi-output system (TRMS). The design objectives of the controller are to stabilise the TRMS in significant cross couplings, reach a desired position and accurately track a specified trajectory. The TRMS model is divided into a horizontal and a vertical subsystem (VS). The cross coupling existing between the two subsystems is considered as the system uncertainty. A simple adaptive tuning law is developed for the SOSM controller to deal with the bounded system uncertainty. The major advantage offered by this adaptive SOSM controller is that advance knowledge about the upper bound of system uncertainty is not a necessary requirement. The adaptive SOSM controller for the VS uses a proportional plus integral sliding surface to counter the offset present in the pitch angle. System robustness and the stability of the controller are proved by using the Lyapunov criterion. Apart from imparting robustness, the proposed adaptive SOSM controller reduces undesired chattering in the control input and thus is suitable for application in practical motion control applications. The proposed control scheme is validated by simulation results and is compared against the existing proportionalintegral-derivative controllers to show that the overall performance of the proposed adaptive SOSM controller is better in the aspects of error and control indices.

Communications in Nonlinear Science and Numerical Simulation, 2012

In this paper, a discrete integral sliding mode (ISM) controller based on composite nonlinear fee... more In this paper, a discrete integral sliding mode (ISM) controller based on composite nonlinear feedback (CNF) method is proposed. The aim of the controller is to improve the transient performance of uncertain systems. The CNF based discrete ISM controller consists of a linear and a nonlinear term. The linear control law is used to decrease the damping ratio of the closed-loop system for yielding a quick transient response. The nonlinear feedback control law is used to increase the damping ratio with an aim to reduce the overshoot of the closed-loop system as it approaches the desired reference position. It is observed that the discrete CNF-ISM controller produces superior transient performance as compared to the discrete ISM controller. The closed-loop control system remains stable during the sliding condition. Simulation results demonstrate the effectiveness of the proposed controller.

Communications in Nonlinear Science and Numerical Simulation, 2011

A second order sliding mode (SOSM) controller using nonlinear sliding surface is proposed in this... more A second order sliding mode (SOSM) controller using nonlinear sliding surface is proposed in this paper. The aim of the proposed controller is to guarantee stability as well as enhance the transient performance of uncertain linear systems with parametric uncertainty. The nonlinear sliding surface consists of a linear term and a nonlinear term. The linear term comprises a gain matrix which has a very low value of damping ratio and thereby facilitates fast response. The nonlinear term is introduced to accommodate a variable damping ratio to reduce overshoot and settling time of the closed loop system as the output reaches nearer the desired reference position. A major gain of the proposed SOSM controller is the elimination of chattering in the control input. The proposed nonlinear sliding surface based SOSM controller achieves fast rise, low overshoot and low settling time. Simulation results demonstrate the effectiveness of the proposed SOSM controller.

Journal of Control Theory and Applications, 2013

ABSTRACT This paper proposes an adaptive integral higher order sliding mode (HOSM) controller for... more ABSTRACT This paper proposes an adaptive integral higher order sliding mode (HOSM) controller for uncertain systems. Instead of a regular control input, the derivative of the control input is used in the proposed control law. The discontinuous sign function in the controller is made to act on the time derivative of the control input. The actual control signal obtained by integrating the derivative control signal is smooth and chattering free. The adaptive tuning law used in the proposed controller eliminates the need of prior knowledge about the upper bound of the system uncertainties. Stability and robustness of the proposed controller are proved by using the classical Lyapunov criterion. Simulation results demonstrate the advantages of the proposed control scheme.