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Piotr Witczak. Trends in Sensors Fault Diagnosis. Sensors 2021, 21, 2224 .
AMA StylePiotr Witczak. Trends in Sensors Fault Diagnosis. Sensors. 2021; 21 (6):2224.
Chicago/Turabian StylePiotr Witczak. 2021. "Trends in Sensors Fault Diagnosis." Sensors 21, no. 6: 2224.
The paper deals with the problem of a neural network-based robust state and actuator fault estimator design for non-linear discrete-time systems. It starts from a review of recent developments in the area of robust estimators and observers for non-linear discrete-time systems and proposes less restrictive procedure for designing a neural network-based H observer. The proposed approach guaranties a predefined disturbance attenuation level and convergence of the observer, as well as unknown input decoupling and state and actuator fault estimation. The main advantage of the design procedure is its simplicity. The paper presents an observer design procedure that is reduced to solving a set of linear matrix inequalities. The final part of the paper presents an illustrative example concerning an application of the proposed approach to the multi-tank system benchmark.
Piotr Witczak; Krzysztof Patan; Marcin Witczak; Marcin Mrugalski. A neural network approach to simultaneous state and actuator fault estimation under unknown input decoupling. Neurocomputing 2017, 250, 65 -75.
AMA StylePiotr Witczak, Krzysztof Patan, Marcin Witczak, Marcin Mrugalski. A neural network approach to simultaneous state and actuator fault estimation under unknown input decoupling. Neurocomputing. 2017; 250 ():65-75.
Chicago/Turabian StylePiotr Witczak; Krzysztof Patan; Marcin Witczak; Marcin Mrugalski. 2017. "A neural network approach to simultaneous state and actuator fault estimation under unknown input decoupling." Neurocomputing 250, no. : 65-75.
Marcin Witczak; Vicenç Puig; Damiano Rotondo; Piotr Witczak. A necessary and sufficient condition for total observability of discrete-time linear time-varying systems. IFAC-PapersOnLine 2017, 50, 729 -734.
AMA StyleMarcin Witczak, Vicenç Puig, Damiano Rotondo, Piotr Witczak. A necessary and sufficient condition for total observability of discrete-time linear time-varying systems. IFAC-PapersOnLine. 2017; 50 (1):729-734.
Chicago/Turabian StyleMarcin Witczak; Vicenç Puig; Damiano Rotondo; Piotr Witczak. 2017. "A necessary and sufficient condition for total observability of discrete-time linear time-varying systems." IFAC-PapersOnLine 50, no. 1: 729-734.
Pawe Majdzik; Marcin Witczak; Lothar Seybold; Piotr Witczak. Design of receding-horizon estimators for the battery assembly system. IFAC-PapersOnLine 2017, 50, 9297 -9302.
AMA StylePawe Majdzik, Marcin Witczak, Lothar Seybold, Piotr Witczak. Design of receding-horizon estimators for the battery assembly system. IFAC-PapersOnLine. 2017; 50 (1):9297-9302.
Chicago/Turabian StylePawe Majdzik; Marcin Witczak; Lothar Seybold; Piotr Witczak. 2017. "Design of receding-horizon estimators for the battery assembly system." IFAC-PapersOnLine 50, no. 1: 9297-9302.
Mariusz Buciakowski; Piotr Witczak. A new Matlab coder for generating Structured Text Language from matrix expression for PLC and PAC controllers. Journal of Physics: Conference Series 2017, 783, 12062 .
AMA StyleMariusz Buciakowski, Piotr Witczak. A new Matlab coder for generating Structured Text Language from matrix expression for PLC and PAC controllers. Journal of Physics: Conference Series. 2017; 783 ():12062.
Chicago/Turabian StyleMariusz Buciakowski; Piotr Witczak. 2017. "A new Matlab coder for generating Structured Text Language from matrix expression for PLC and PAC controllers." Journal of Physics: Conference Series 783, no. : 12062.
This paper provides a necessary and sufficient condition for the reachability of discrete-time Takagi–Sugeno fuzzy systems that is easy to apply, such that it constitutes a practical test. The proposed procedure is based on checking if all the principal minors associated to an appropriate matrix are positive. If this condition holds, then the rank of the reachability matrix associated to the Takagi–Sugeno fuzzy system is full for any possible sequence of premise variables, and thus the system is completely state reachable. On the other hand, if the principal minors are not positive, the property of the matrix being a block P one with respect to a particular partition of a set of integers is studied in order to conclude about the reachability of the Takagi–Sugeno system. Examples obtained using an inverted pendulum are used to show that it is easy to check this condition, such that the reachability analysis can be performed efficiently using the proposed approach.
Marcin Witczak; Damiano Rotondo; Vicenç Puig; Piotr Witczak. A practical test for assessing the reachability of discrete-time Takagi–Sugeno fuzzy systems. Journal of the Franklin Institute 2015, 352, 5936 -5951.
AMA StyleMarcin Witczak, Damiano Rotondo, Vicenç Puig, Piotr Witczak. A practical test for assessing the reachability of discrete-time Takagi–Sugeno fuzzy systems. Journal of the Franklin Institute. 2015; 352 (12):5936-5951.
Chicago/Turabian StyleMarcin Witczak; Damiano Rotondo; Vicenç Puig; Piotr Witczak. 2015. "A practical test for assessing the reachability of discrete-time Takagi–Sugeno fuzzy systems." Journal of the Franklin Institute 352, no. 12: 5936-5951.
The paper deals with the problem of neural-network based on robust unknown input observer design for the fault diagnosis. Authors review the recent development in the area of robust observers for non-linear discrete-time systems and propose less restrictive procedure for design of the \({\mathcal {H}_\infty }\) observer. The approach guaranties simultaneously the unknown input decoupling and the fault estimation. The paper presents an unknown input observer design that reduces to a set of linear matrix inequalities. The final part of the paper presents an illustrative example devoted to fault diagnosis of the wind turbine.
Piotr Witczak; Marcin Mrugalski; Krzysztof Patan; Marcin Witczak. A Neural-Network-Based Robust Observer for Simultaneous Unknown Input Decoupling and Fault Estimation. Transactions on Petri Nets and Other Models of Concurrency XV 2015, 535 -548.
AMA StylePiotr Witczak, Marcin Mrugalski, Krzysztof Patan, Marcin Witczak. A Neural-Network-Based Robust Observer for Simultaneous Unknown Input Decoupling and Fault Estimation. Transactions on Petri Nets and Other Models of Concurrency XV. 2015; ():535-548.
Chicago/Turabian StylePiotr Witczak; Marcin Mrugalski; Krzysztof Patan; Marcin Witczak. 2015. "A Neural-Network-Based Robust Observer for Simultaneous Unknown Input Decoupling and Fault Estimation." Transactions on Petri Nets and Other Models of Concurrency XV , no. : 535-548.
This paper is based on a current research project and describes methods which aim to contribute to the estimation of the energy consumption in the production of goods. Today, the energy a product requires during its operation is the object of many activities in research and development. However, the energy necessary for the production of goods is very often not analyzed in comparable depth. The energy consumption in production and disposal is determined very early in the product development process by designers and engineers, for example, through selection of raw materials, explicit and implicit requirements concerning the manufacturing and assembly processes or through decisions concerning the product architecture. Today, developers and engineers have at their disposal manifold design and simulation tools, which can help to predict the energy consumption during operation relatively accurately. In contrast, tools with the objective to predict the energy consumption in production and disposal are not available apart from the first material databases, such as Eco Materials Adviser in Autodesk.Calculations of the energy consumption in the production can be based on certain volumes and/or the weights of the components or of certain sections of the components. For example, the milling volume for milling operations can be used to determine the energy necessary for this milling operation. Research in production technology can these days provide the necessary tables and equations to determine this energy, if only the milling volume and the milling operations are defined accurately enough. The geometry is developed today almost exclusively in three-dimensional CAD systems. In such systems, the volumes and weights of all components are available today; therefore, the extension is very promising to couple future systems with CAD systems
Ralf Stetter; Piotr Witczak; Claudius Spindler; Julian Hertel; Marcin Witczak. Intelligent Systems for the Prognosis of Energy Consumption in Manufacturing and Assembly. Procedia CIRP 2015, 33, 370 -375.
AMA StyleRalf Stetter, Piotr Witczak, Claudius Spindler, Julian Hertel, Marcin Witczak. Intelligent Systems for the Prognosis of Energy Consumption in Manufacturing and Assembly. Procedia CIRP. 2015; 33 ():370-375.
Chicago/Turabian StyleRalf Stetter; Piotr Witczak; Claudius Spindler; Julian Hertel; Marcin Witczak. 2015. "Intelligent Systems for the Prognosis of Energy Consumption in Manufacturing and Assembly." Procedia CIRP 33, no. : 370-375.
The paper deals with the problem of robust fault-tolerant model predictive control for non-linear discrete-time systems described by the Linear Parameter-Varying model. The proposed approach is based on a multi-stage stage procedure. Robust controller is designed without taking into account the input constraints related with the actuator saturation and deals with previously estimated faults. Thus, to check the compensation feasibility, employed robust invariant set takes into account the input constraints. If the current state does not belong to the robust invariant set, then a predictive control is performed in order to enhance the invariant set. This appealing phenomenon makes it possible to enlarge the domain of attraction, which makes the proposed approach an efficient solution for the fault-tolerant control. The final part of the paper shows an illustrative example for the variable-speed variable-pitch wind turbines.
Piotr Witczak; Marcel Luzar; Marcin Witczak; Jozef Korbicz. A robust fault-tolerant model predictive control for linear parameter-varying systems. 2014 19th International Conference on Methods and Models in Automation and Robotics (MMAR) 2014, 462 -467.
AMA StylePiotr Witczak, Marcel Luzar, Marcin Witczak, Jozef Korbicz. A robust fault-tolerant model predictive control for linear parameter-varying systems. 2014 19th International Conference on Methods and Models in Automation and Robotics (MMAR). 2014; ():462-467.
Chicago/Turabian StylePiotr Witczak; Marcel Luzar; Marcin Witczak; Jozef Korbicz. 2014. "A robust fault-tolerant model predictive control for linear parameter-varying systems." 2014 19th International Conference on Methods and Models in Automation and Robotics (MMAR) , no. : 462-467.
The main contribution of the paper was to propose a robust predictive fault-tolerant control scheme for a class of non-linear discrete-time systems that can be described with the LPV models using neural networks. Indeed, the contribution can be divided into a few important points: extension of the efficient predictive control to the robust case with exogenous external disturbances acting on the system, development of robust fault estimation and compensation scheme, and an integration of the developed schemes within a unified robust predictive fault-tolerant control framework. The proposed approach was applied to the benchmark example of the multi-tank system. The achieved results show the performance of the high performance of the proposed approach. In spite of the incontestable appeal of the proposed approach there are still some points, which may further improve its effectiveness. Indeed, in the proposed approach it is assumed the the state is available and, hence a natural approach is to relax this assumption by the introduction of a suitable state estimation strategy.
Marcel Luzar; Marcin Witczak; Piotr Witczak; Christophe Aubrun. Neural-network based robust predictive fault-tolerant control for multi-tank system. 2014 European Control Conference (ECC) 2014, 276 -281.
AMA StyleMarcel Luzar, Marcin Witczak, Piotr Witczak, Christophe Aubrun. Neural-network based robust predictive fault-tolerant control for multi-tank system. 2014 European Control Conference (ECC). 2014; ():276-281.
Chicago/Turabian StyleMarcel Luzar; Marcin Witczak; Piotr Witczak; Christophe Aubrun. 2014. "Neural-network based robust predictive fault-tolerant control for multi-tank system." 2014 European Control Conference (ECC) , no. : 276-281.
Ralf Stetter; Andreas Paczynski; Piotr Witczak; Benjamir Staiger. Advanced Trajectory Planning for Production Energy Estimation. Pomiary Automatyka Robotyka 2014, 18, 70 -77.
AMA StyleRalf Stetter, Andreas Paczynski, Piotr Witczak, Benjamir Staiger. Advanced Trajectory Planning for Production Energy Estimation. Pomiary Automatyka Robotyka. 2014; 18 (2):70-77.
Chicago/Turabian StyleRalf Stetter; Andreas Paczynski; Piotr Witczak; Benjamir Staiger. 2014. "Advanced Trajectory Planning for Production Energy Estimation." Pomiary Automatyka Robotyka 18, no. 2: 70-77.
An issue of prototyping Systems of Concurrent Cyclic Processes (SCCP), in which a number of concurrently running processes compete to access to a set of resources is considered. The main outcome of this paper is an automated procedure of performance evaluation for such systems with desired values of a wide range of system functional characteristics, such as a schedule of processes flows and the system period. This stage is realised by a procedure of automatic building of an analytical model of SCCP, which is based on the (max, +) algebra formalism. In most cases the (max, +) algebra is used to model of discrete-event systems, while the synchronization is based on rendezvous protocol. However, in this paper - modeling of the systems is based on mutual exclusion protocol, moreover buffers are included. As an illustrative example example RAFI Battery Assembly System was given in this paper.
Lothar Seybold; Piotr Witczak; Paweł Majdzik; Ralf Stetter. Modeling Discrete-Event Systems with Hard Synchronization Constraints. Advances in Intelligent Systems and Computing 2014, 230, 511 -521.
AMA StyleLothar Seybold, Piotr Witczak, Paweł Majdzik, Ralf Stetter. Modeling Discrete-Event Systems with Hard Synchronization Constraints. Advances in Intelligent Systems and Computing. 2014; 230 ():511-521.
Chicago/Turabian StyleLothar Seybold; Piotr Witczak; Paweł Majdzik; Ralf Stetter. 2014. "Modeling Discrete-Event Systems with Hard Synchronization Constraints." Advances in Intelligent Systems and Computing 230, no. : 511-521.
Marcel Luzar; Marcin Witczak; Józef Korbicz; Piotr Witczak. Neural-Network Based Robust FTC: Application to Wind Turbines. Transactions on Petri Nets and Other Models of Concurrency XV 2014, 97 -108.
AMA StyleMarcel Luzar, Marcin Witczak, Józef Korbicz, Piotr Witczak. Neural-Network Based Robust FTC: Application to Wind Turbines. Transactions on Petri Nets and Other Models of Concurrency XV. 2014; ():97-108.
Chicago/Turabian StyleMarcel Luzar; Marcin Witczak; Józef Korbicz; Piotr Witczak. 2014. "Neural-Network Based Robust FTC: Application to Wind Turbines." Transactions on Petri Nets and Other Models of Concurrency XV , no. : 97-108.
The paper deals with the problem of robust predictive fault-tolerant control for non-linear discrete-time systems. The proposed approach is based on a triple stage procedure, i.e. its starts from fault estimation, the fault is compensated with a robust controller. Finally, if the fault compensation does not provide satisfactory, which means that the current state does not belong to the robust invariant set, then a suitable predictive control actions are performed in order to enhance the invariant set. This appealing phenomenon makes it possible to enlarge the domain of attraction, which makes the proposed approach an efficient solution. The final part of the paper shows how to extend the proposed approach to the non-linear systems that can be described with the Takagi-Sugeno models.
Marcin Witczak; Piotr Witczak. Efficient Predictive Fault-Tolerant Control for Non-linear Systems. Advances in Intelligent Systems and Computing 2014, 230, 65 -76.
AMA StyleMarcin Witczak, Piotr Witczak. Efficient Predictive Fault-Tolerant Control for Non-linear Systems. Advances in Intelligent Systems and Computing. 2014; 230 ():65-76.
Chicago/Turabian StyleMarcin Witczak; Piotr Witczak. 2014. "Efficient Predictive Fault-Tolerant Control for Non-linear Systems." Advances in Intelligent Systems and Computing 230, no. : 65-76.
The paper deals with the problem of robust predictive fault-tolerant control for non-linear discrete-time systems. The proposed approach starts with the fault estimation and then the fault is compensated with a robust controller. If the robust fault compensation does not provide satisfactory results, which means that the current state does not belong to the robust invariant set, then a suitable predictive control actions are performed in order to enhance the invariant set. This appealing phenomenon makes it possible to enlarge the domain of attraction, which makes the proposed approach an efficient solution. Subsequently, the proposed approach is extended to the linear parameter varying systems. The final part of the paper shows an illustrative example regarding wind turbines.
Marcin Witczak; Piotr Witczak; Jozef Korbicz; Christophe Aubrun. Robust and efficient predictive FTC: Application to wind turbines. 2013 Conference on Control and Fault-Tolerant Systems (SysTol) 2013, 371 -376.
AMA StyleMarcin Witczak, Piotr Witczak, Jozef Korbicz, Christophe Aubrun. Robust and efficient predictive FTC: Application to wind turbines. 2013 Conference on Control and Fault-Tolerant Systems (SysTol). 2013; ():371-376.
Chicago/Turabian StyleMarcin Witczak; Piotr Witczak; Jozef Korbicz; Christophe Aubrun. 2013. "Robust and efficient predictive FTC: Application to wind turbines." 2013 Conference on Control and Fault-Tolerant Systems (SysTol) , no. : 371-376.
Prototyping Systems of Concurrent Cyclic Processes (SCCP), in which a number of simultaneously running processes compete to access to a set of resources, in an automated way is the main thread of this paper. Procedure of performance evaluation for such systems with desired values of a wide range of system functional characteristics, such as a schedule of processes flows and the system period, especially with multiple executions of single process cycles within single system cycle will be presented. This stage is realised by a procedure of automatic building of an analytical model of SCCP, which is based on the (max, +) algebra formalism. In most cases the (max, +) algebra is used to model of discrete-event systems, while the synchronization is based on randez-vous protocol. However, in this paper - modeling of the systems is based on mutual exclusion protocol, moreover buffers are included. Moreover the algorithm of determining of the system period and schedule of workflow - when there is no direct relation between eigenvalue of system matrix and system period - will be presented.
Lothar Seybold; Piotr Witczak; Pawel Majdzik. Modeling discrete-event systems with constraints. 2013 18th International Conference on Methods & Models in Automation & Robotics (MMAR) 2013, 789 -793.
AMA StyleLothar Seybold, Piotr Witczak, Pawel Majdzik. Modeling discrete-event systems with constraints. 2013 18th International Conference on Methods & Models in Automation & Robotics (MMAR). 2013; ():789-793.
Chicago/Turabian StyleLothar Seybold; Piotr Witczak; Pawel Majdzik. 2013. "Modeling discrete-event systems with constraints." 2013 18th International Conference on Methods & Models in Automation & Robotics (MMAR) , no. : 789-793.