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In this paper, a Fault Tolerant Control (FTC) strategy using a virtual sensor for Linear Parameter Varying (LPV) systems is proposed. The main idea of this FTC method is to reconfigure the control loop such such that the nominal controller could be still used without need of retuning it. That is, the plant with the sensor fault is modified adding the virtual sensor block that masks this fault and...
The article demonstrates how to generate the trajectory, taking into account the concept of the tunnel of error that ensures route trace with an error no greater than assumed, even in difficult to predict environmental conditions. The mathematical model of kinematics and dynamics using spatial vectors is presented in short. The theoretical assumptions are tested by simulation. The model used in the...
In this paper, a robust fault-tolerant control strategy for constrained multisensor linear systems, subject to sensor faults and in the presence of bounded state and output disturbances is proposed. The scheme verifies that for each sensors-estimator combination, suitable residual variables lie inside pre-computed sets and selects the more appropriate combination based on a chosen criterion. An active...
This paper proposes a modification to the dynamic causal digraph (DCDG) method in order to address the detection and isolation of oscillations in a process. The proposed detection method takes advantage of the properties of residual signals generated by the DCDG method by studying their zero-crossings. The method is tested in an application to a board making process and the results are presented and...
This paper provides an adaptation algorithm for the control of complex system via recurrent neural networks. The proposed method is derived from RTRL algorithm. Neural emulator and neural controller parameters are one-line updated independently. To illustrate the tracking and the disturbance rejection capabilities of the real time control algorithm and the efficiency of the networks parameters relaxation,...
The design problem of fault detection and isolation filters can be formulated as a model matching problem and solved using an H2-norm minimization approach. A systematic procedure is proposed to choose appropriate filter specifications which guarantee the existence of proper and stable solutions of the model matching problem. This selection is integral part of a numerically reliable computational...
In this paper, we first introduce a distributed control strategy for velocity synchronization (or velocity consensus seeking) of multiple heterogeneous Euler-Lagrange (EL) systems with switching communication network topologies. This controller is denoted as the “nominal” controller. To guarantee velocity synchronization for switching communication network topologies we require existence of non-vanishing...
The first step of Model-based FDI technique is to determine at least a model of the system to monitor. This paper deals with an advanced open-loop identification formulation developed for linear stationary dynamical systems, including the model structure estimation. This approach leads to a kind of canonical state-space form, which is characterised by a mixed parameterisation using a Specific Form...
This paper presents the principles of a highly autonomous fault diagnosis system with plug-and-play capabilities that consists in solutions for auto-generating tests from models and for computing diagnoses from the symptoms coming from the generated tests. The operation principles are detailed and technological aspects for implementation are discussed. Thanks to these diagnosis systems, installers...
This paper deals with switching detection and recognition of current operating mode in hybrid systems, where the nonlinear modes are represented by a Takagi Sugeno model. A data-based projection method is used to generate a set of signals, named residuals. This method uses only the input/output known signals and the kind of model (linear, bilinear, ...); the precise value of the model parameters is...
Control allocation is a solution to distribute the control efforts among a redundant set. A new approach to manage the actuators redundancy in the presence of faults is proposed based on reliability indicators. The aim is to preserve the health of the actuators and the availability of the system both in the nominal behavior and in the presence of actuator faults. In degraded functional, a reconfigured...
In this paper, the problem of robust synchronization and fault detection for a class of master-slave systems subjected to some nonlinear perturbations and mixed neutral and discrete time-varying delays is investigated based on an H∞ performance condition. By introducing a descriptor technique, using Lyapunov-Krasovskii functional and a suitable change of variables, new required sufficient conditions...
This paper deals with the evaluation of Discrete Control Systems whose implementation is distributed among Programmable Logic Controllers (PLC) and remote Input/Output devices communicating through a Wireless Network. Using wireless communication in these applications, called Wireless Networked Discrete Control System (WNDCS), offers many advantages such as a greater mobility and reduced wiring costs,...
Planning missions is one of the most important tasks in Command and Control (C2) domain. Many efforts have been devoted to improve the planning process in order to deal with new constraints such as planning in a multi-user, multi-perspective, distributed and network-enabled environment. Unfortunately, less effort has been devoted to monitor the execution of plans in-progress. In this work, we propose...
The present paper uses set theoretic methods for the design of a fault tolerant control scheme in the case of a multisensor application. The basic principle is the separation of invariant sets for the estimations of the state and tracking error under healthy and faulty functioning. The fault scenario is based on abrupt changes of the observation equations. The main contribution is the introduction...
The general context of this paper is the design of active Fault Tolerant Control (FTC) strategy for Linear Time Invariant (LTI) systems. Active FTC strategies must ensure good fault compensation when a fault is detected by the Fault Detection and Isolation (FDI) unit. FDI and FTC performances are thus highly connected. Since a FTC problem is above all a control problem, the proposed work focuses on...
This paper suggests Petri nets as a mathematical and graphical tool for modeling an industrial oil producing station. It enhances the bottom-up methodology for modeling such stations. It also employs the MATLAB-based PN-tool and the concepts of Petri nets to analysis the developed model that has continuous and discrete activities. The former leads to some difficulties in modeling of hybrid systems...
The paper presents a hierarchical architecture for fault tolerant control of mechatronic systems. In the architecture, both the diagnosis and the reconfiguration are completely decentralized according to the structure of the control system. This is achieved by using a purely service oriented view of the system including both hardware and software. The service view with no cyclic dependencies is further...
In this paper, a fault tolerance theory for queue based congestion control is proposed in the behavioral system theoretical framework. The router dynamics changes instantaneously when the fault occurs causing the undesirable instability in the queue length. To improve the dynamics of TCP/AQM networks, suitable controllers (stable and optimal) are synthesized using the concept of canonical controller...
This paper deals with fault diagnosis issues for a Gas Turbine, GT, of a Combined Cycle Power Plant, CCPP. To analyze under which conditions faults in the turbogenerator can be detected and isolated, structural properties of the model are used. The structure redundancy is studied by graph tools considering the standard available measurements. A non-linear dynamic model given by 37 algebraic and differential...
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