Tushar Jain

• Ph.D.
• Professor (Associate) at Indian Institute of Technology Mandi

Self-localisation is a critical concept in the context of autonomous navigation and control of mobile robots. The most prevalent method for localisation is sensor fusion. Nevertheless, there are certain situations where the robots are compelled to localise on minimal sensor information. Furthermore, the key challenge is determining how to localise...

This work proposes a new technique to characterize the suboptimality of stabilizing control laws for the infinite‐horizon linear quadratic regulation problem, wherein the norm of the state feedback gain matrix is conditioned to be lesser than a given bound. In contrast to existing techniques where the upper bound on the cost is pre‐specified, this...

This paper investigates the implementation of the Koopman framework to quadrotor by numerical simulations. Initially, the nonlinear dynamics of a quadrotor is modelled in MATLAB/SIMULINK. The attitude and altitude control of the model is achieved using individual PID controllers. From this closed-loop model, the attitude data and angular torque dat...

In this paper, we propose a novel bilinear observer-based robust fault detection, isolation and adaptive fault estimation methodology to precisely estimate a class of actuator faults, namely bias in damper position and lock-in-place faults, in Variable-Air-Volume (VAV) terminal units of Heating Ventilation and Air-Conditioning (HVAC) systems. The p...

The non - overshooting/undershooting (NOUS) tracking control objective in the output response of the closed-loop system has several practical applications in “positioning” control problems. Recently, a state-feedback gain matrix based on Moore’s eigenstructure assignment technique to achieve the above control objective with a desired convergence ra...

This article presents a new technique for suboptimal consensus protocol design for a class of multiagent systems. The technique is based upon the extension of newly developed sufficient conditions for suboptimal linear-quadratic optimal control design, which are derived in this paper by an explication of a noniterative solution technique of the inf...

The call for papers is now open to submission to this special issue. Kindly visit the page for more details. https://www.mdpi.com/journal/entropy/special_issues/Fault_Tolerant_Information

In this paper, we propose a novel bilinear observer- based robust fault detection, isolation and adaptive fault estimation methodology to precisely estimate a class of actuator faults, namely bias in damper position and lock-in-place faults, in Variable-Air-Volume (VAV) terminal units of Heating Ventilation and Air-Conditioning (HVAC) systems. The...

In this paper, we propose a novel bilinear observer- based robust fault detection, isolation and adaptive fault estimation methodology to precisely estimate a class of actuator faults, namely bias in damper position and lock-in-place faults, in Variable-Air-Volume (VAV) terminal units of Heating Ventilation and Air-Conditioning (HVAC) systems. The...

To develop an effective control and monitoring scheme for automotive engines, a precise knowledge of the parameters and unmeasurable states of the nonlinear model capturing the overall dynamics of engines is of utmost importance. For a new vehicle out of the assembly line, the nonlinear model has constant parameters. However, in the long run, due t...

Three-phase passive (or uncontrolled) rectifiers are typically placed at the front end of the overall power conditioning circuit for AC to DC conversion in low-cost, small-scale renewable-energy systems, e.g. residential purposes wind turbines. Whenever a diode in one leg or multiple legs becomes faulty, offering an open circuit to the flow of curr...

In this paper, we design a novel robust bilinear observer using the special coordinate basis transformation technique to generate robust residuals and present an actuator fault detection logic which decouples partial process disturbances and is not affected by a mismatch in the bilinear dynamics of the plant and the observer. The residuals obtained...

Engines are complex and their control is very important in the automotive industry. One of the main objectives while designing the control strategies is to maintain the air-fuel ratio to a specific value. This has increased the inspection of engine dynamical models and their parameter estimation. Some of the main parameters affecting the air-fuel r...

https://www.constructionweekonline.in/business/12454-what-it-takes-to-create-a-net-zero-energy-building

Actuator faults in wind turbines (WT) significantly increase the structural loads exhibited by torsional vibration and tower fore-aft bending, thereby, drastically hampering the turbine health in terms of the reduction in its lifetime. This paper presents a health-aware fault-tolerant control (HAFTC) scheme for WT such that the turbine health, i.e....

This letter revisits the problem of synthesizing the optimal control laws for linear systems with a quadratic cost. Traditionally, these laws are computed using the Hamilton-Jacobi-Bellman method, where the solution to the original problem is obtained by solving the Riccati equation, which hinges upon a priori information of the optimal cost functi...

In order to monitor the health of an internal combustion engine, there is a need to check the engine parameters from time to time. These parameters are further used in control and calibration. In this work, mean value engine dynamics of spark ignition model are taken and parameter estimation is done using Recursive Least Squares with forgetting fac...

This article proposes a new approach to consensus protocol design for scalar single integrator multi-agent systems based on Krotov framework in optimal control theory. The problem under consideration is generally non-convex due to the distributed nature of the control input to be designed. To tackle this problem, this work employs the Krotov framew...

This work considers the problem of optimal consensus protocol design for the double integrator agents. The problem is tackled in the Krotov framework. The optimal consensus protocol design problem usually turns out to be non-convex due to the desired distributed nature of the protocol to be designed, a requirement imposed by the interaction topolog...

This article considers the problem of sub-optimal control design problem for second order non-linear systems. Traditionally, the computation of optimal control law(s) for non-linear systems is usually done using the iterative methods based on the standard tools of optimal control theory which viz. Calculus of Variations (CoV), Hamilton-Jacobi-Bellm...

The engine control and estimation problem is an important area of research in the automotive industry. Researchers have been working to make the vehicles more efficient and economically friendly while producing lesser pollutants. To reduce emissions, the air-fuel ratio must be controlled to a specific value. The requirement of air-fuel ratio improv...

This article proposes a novel alternative approach for optimal consensus protocol design for scalar single-integrator multi-agent systems based on the Krotov methodology. The problem under consideration generally turns out to be non-convex due to the desired diffusive nature (i.e. using only relative information from the neighboring agents) of the...

This paper revisits the problem of synthesizing the optimal control law for linear systems with a quadratic cost. For this problem, traditionally, the state feedback gain matrix of the optimal controller is computed by solving the Riccati equation, which is primarily obtained using calculus of variations- (CoV-) based and Hamilton–Jacobi–Bellman (H...

The operational cost of wind turbines(WT) is remarkably incurred in fatigue loads induced by torsional vibration within the drive-train subsystem and fore-aft bending of the tower subsystem. Under closed-loop control configuration, actuator faults in pitch subsystem and converter subsystem proliferate these fatigue loads, thereby, severely affect t...

Centralized heating, ventilation, and air-conditioning (HVAC) systems equipped with variable-air-volume (VAV) terminal boxes are widely used for energy-efficient control in multizone buildings. Any occurrence of faults in VAV boxes drastically hampers the control performance. In this paper, we present a novel bilinear observer-based fault diagnosis...

This paper revisits the problem of optimal control law design for linear systems using the global optimal control framework introduced by Vadim Krotov. Krotov's approach is based on the idea of total decomposition of the original optimal control problem (OCP) with respect to time, by an ad hoc choice of the so-called Krotov's function or solving fu...

This paper revisits the problem of optimal control law design for linear systems using the global optimal control framework introduced by Vadim Krotov. Krotov's approach is based on the idea of total decomposition of the original optimal control problem (OCP) with respect to time, by an $ad$ $hoc$ choice of the so-called Krotov's function or solvin...

Renewable sources of energy are now being considered on the priority level of energy policies in many countries worldwide in order to reduce the high environmental impact of fossil-based energy systems. The current resurgence of interest in producing potential electric power has been seen by utilizing sources such as wind, solar, bioenergy, etc. Un...

This chapter introduce the benchmark examples that will be used to illustrate the effectiveness of the active fault-tolerant control systems later in the text.

This chapter reviews the current and past status of the progress made in the area of FTC research. Most of the FTC techniques depends on the type of fault occurred into the system, where the FD plays a significant role. So, the chapter starts with classifying the types of faults followed by the discussion on fault diagnosis and the analysis of vari...

In the previous chapter, we presented a novel projection-based approach to solve the active fault-tolerant control problem posed in the Chap. 1.

In this chapter, we shall demonstrate the applications of approaches on various case-studies.

In this chapter, we shall present the solution to the problem of Fault-tolerant Control (FTC) by taking the behavioral system theoretic viewpoint.

The prime aim of a fault-tolerant control system is to maintain the system performance, defined in terms of the desired behavior, at anytime, i.e., even after an occurrence of a fault. In previous two chapters, we presented novel real-time controller reconfiguration mechanisms to deal with the aforementioned issue.

In this chapter, we introduce basic concepts of the behavioral approach that put the foundation to address active FTC approaches in this book. We shall see here how the behaviors are described for a dynamical system. The elementary properties (for example linearity, time/shift invariance) associated with a dynamical system are discussed taking this...

The book introduces novel algorithms for designing fault-tolerant control (FTC) systems using the behavioral system theoretic approach, and presents a demonstration of successful novel FTC mechanisms on several benchmark examples. The authors also discuss a new transient management scheme, which is an essential requirement for the implementation of...

In this paper, we present a novel active fault-tolerant control (FTC) methodology for wind turbines, which minimizes the economic cost of the turbine by achieving two broad objectives: power maximization and fatigue reduction possibly under the effect of bias faults in converters. The proposed FTC system is composed of two modules: fault diagnosis...

Heating, Ventilation and Air Conditioning (HVAC) systems are installed in commercial buildings to meet the actual demand of heating and cooling at a given time such that the thermal comfort of occupants within the rooms (or zones) can be ensured. This is achieved by feeding air into the zones at a constant temperature using variable air volume (VAV...

Scarcely understood defects lead to asthenozoospermia, which results in poor fertility outcomes. Incomplete knowledge of these defects hinders the development of new therapies and reliance on interventional therapies, such as in vitro fertilization, increases. Sperm cells, being transcriptionally and translationally silent, necessitate the proteomi...

Kindly visit the link for a detailed description: https://www.hindawi.com/journals/jcse/si/368954/cfp/

The aims of this paper are twofold. Firstly, we present a model-free algorithm for synthesizing an online controller. Secondly, this algorithm also addresses the issue of switching this controller in a closed loop with a bumpless interconnection mechanism. The novelty of this algorithm lies in the fact that we do not use any a priori knowledge of t...

Variable air volume (VAV) boxes are used in multi-zone buildings, which varies the volume of constant temperature air separately supplied by an air-handling unit to meet challenging thermal load demands of individual zones. A fault appearing in the VAV damper severely affects the control performance and consequently, the energy efficiency of the ov...

In this paper, we formulate the fault-tolerant control (FTC) problem in the behavioral system theoretic framework. To solve this problem, two methodologies are presented, which rest under the broad classification of FTC systems, namely projection-based approach and online redesign approach. The novelty within these approaches lies in the fact that...

In this paper, we present a real-time algorithm for synthesizing an online controller and its implementation in the closed-loop. The novelty of this algorithm lies in the fact that we do not use any a priori knowledge of the model of the plant in real-time. We use the mathematical framework of behavioral theory to demonstrate the online synthesizin...

The aims of this paper are two-folds. Firstly, we present a model-free algorithm for synthesizing an online controller. Secondly, this algorithm also addresses the issue of switching this controller in closed-loop with a bumpless mechanism. The novelty of this algorithm lies in the fact that we do not use any a priori knowledge of the model of the...

Multiple-evaporator/vapor compression cooling systems are used for air conditioning in multi-zone buildings with a refrigerant supplied to each individual zone-evaporator from a central compressor/condenser unit. Such systems, incorporating controlled electronic expansion valves associated to each evaporator and a variable-speed compressor, allow t...

This paper presents a trajectory-based online controller reconfiguration mechanism to tolerate faults in a wind turbine (WT) system. The system is a benchmark WT model which includes FAST coded simulator designed by the U.S. National Renewable Energy Laboratory's. The novelty of the proposed mechanism is that no a priori information about the model...

This paper presents a trajectory-based online control reconfiguration mechanism against unknown fault occurring in an electric circuit. First, we demonstrate the modeling of an electric circuit by taking the time-trajectory viewpoint, where no a priori input–output partition has been made. The uniqueness of this viewpoint lies in the fact that it d...

The aims of this paper are two folds. First, we aim to gain some insights at the time Trajectory-based Active Fault-Tolerant Control (TAFTC) using the frequency spectrum analysis. Secondly, we introduce the concept of finite-time stability (FTS) in the context of AFTC systems. Generally, in TAFTC strategy, the desired specifications are defined in...

This paper presents a real-time mechanism to tolerate faults occurring in a wind turbine (WT) system. This system is a FAST coded simulator designed by the U.S. National Renewable Energy Laboratory's (NREL's) National Wind Turbine Center. The demonstrated mechanism lies under the taxonomy of active fault-tolerant control (AFTC) systems, namely the...

In this note, we discuss about the performance evaluator tool that plays a significant role in the data-driven fault tolerant control (FTC) system. In our notion of data-driven approach, we do not have any access to the a priori plant model in real-time. Moreover, we do not equip any estimation algorithm to determine the model of the plant. Here, w...

In this paper, we present a real-time mechanism to accommodate faults occurring in a Wind Turbine (WT) system. The demonstrated mechanism lies under the taxonomy of Active Fault-tolerant Control (FTC) systems, namely the online redesign based approach. In the proposed approach, we do not use any a priori information about the model of the turbine i...

This paper presents a real-time mechanism to tolerate faults occurring in a Wind Turbine (WT) system. This system is a FAST coded simulator designed by the U.S. National Renewable Energy Laboratory. The demonstrated mechanism lies under the taxonomy of Active Fault-tolerant Control (FTC) systems, namely the online redesign based approach. In the pr...

This paper presents a real-time mechanism to tolerate faults occurring in a Wind Turbine system such that it can generate the rated power at anytime. This mechanism lies under the taxonomy of Active Fault-Tolerant Control (AFTC) system, namely projection-based approach. In the proposed approach, we do not use any a priori information about the mode...

This paper presents a real-time mechanism to tolerate faults occurring in a wind turbine (WT) system. This system is composed of a FAST coded simulator designed by the U.S. National Renewable Energy Laboratory. The demonstrated mechanism lies under the taxonomy of active fault-tolerant control (FTC) systems, namely online redesign based approach. I...

This paper presents a real-time mechanism to tolerate faults occurring in a Wind Turbine (WT) system. This system is a FAST coded simulator designed by the U.S. National Renewable Energy Laboratory's. The demonstrated mechanism lies under the taxonomy of Active Fault-Tolerant Control (AFTC) systems, namely online redesign based approach. In the pro...

In this paper, we present a case study for fault-tolerant control of an electric circuit in the behavioral framework. First, we demonstrate the modeling of electric circuit using the behavioral point of view, where no a priori input-output partition has been made. The uniqueness of behavioral approach lies in the fact that it deals only with variab...

The field of system and control theory has achieved an interdisciplinary status during the past five decades, and we refer to the theory that was developed during this period as the conventional control theory. This mainly relates to the study of automation and the design of controllers. A controller is a device that makes the interconnection with...

The field of system and control theory has achieved an interdisciplinary status during the past five decades, and we refer to the theory that was developed during this period as the conventional control theory. This mainly relates to the study of automation and the design of controllers. A controller is a device that makes the interconnection with...

In this note, we present a model-free approach to solve an active fault-tolerant control problem in the behavioral framework. In our control structure, we do not require an explicit fault diagnosis module that identifies the complete fault information. Instead, a new controller is designed based only on the measurements generated by the system in r...

In this note, we discuss about the performance evaluator tool that plays a significant role in the data-driven fault tolerant control (FTC) system. In our notion of data-driven approach, we do not have any access to the a priori plant model in real-time. Moreover, we do not equip any estimation algorithm to determine the model of the plant. Here, w...

In this note, we present a model-free approach to solve an active fault-tolerant control problem in the behavioral framework. In our control structure, we do not require an explicit fault diagnosis module that identifies the complete fault information. Instead, a new controller is designed based only on the measurements generated by the system in r...

In the behavioral setting, a controller is designed using the behavior of the plant, and the given desired behavior. Further, the synthesized controller makes an interconnection with the plant such that the interconnected system satisfies the desired behavior. However, at the time of interconnection it might not be possible. Here, first we design a...

In this note, we present a model-free approach to solve an active fault-tolerant control problem for linear time-invariant systems using the mathematical framework of behavioral theory. In our control structure, we do not require an explicit fault diagnosis module to identify the complete fault information. Instead, a new controller is designed bas...

A behavioral theoretical explanation of active fault tolerant control (FTC) problem is proposed in this note. Precisely, we present the concept of canonical controller and unfalsified control in behavioral context. The synergy of two control concepts re-configures the controller such that the system is tolerant to unknown faults. The main feature o...