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检索条件"任意字段=5th IFAC Symposium on Modelling and Control in Biomedical Systems"

共 781 条记录，以下是241-250 订阅

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Modular Fault Ascription and Corrective Maintenance Using a Digital Twin

Modular Fault Ascription and Corrective Maintenance Using a ...

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16th ifac symposium on Information control Problems in Manufacturing (INCOM)

作者： Vathoopan, Milan Johny, Maria Zoitl, Alois Knoll, Alois Fortiss GmbH Guerickestr 25 D-80805 Munich Germany TUM Boltzmannstr 3 D-85748 Garching Germany

the industrial environment is slowly transforming to a networked system of systems nature with industry 4.0. Automation systems are getting more production friendly by being more reconfigurable and adaptable. the plant engineering process is also getting improved by offering modular architecture, model-based engineering, etc. this transformation necessitates novel methodologies in maintenance practices as well. With the emergence of predictive maintenance techniques, sometimes it is possible to predict a breakdown and thus conveniently schedule the corrective maintenance. But this is not always the case, the incidence of unscheduled corrective maintenance is prevalent in an industrial environment. And the methodologies for corrective maintenance have to be reshaped fitting to the new plant environment. this paper introduces a new modular corrective maintenance methodology, using the digital twin of an automation module. Fault ascription support for a human technician, performing corrective maintenance action of an automation module is provided by its digital twin and associated visual interface. A use case scenario is propounded and future visions are presented. (C) 2018, ifac (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Cyber-Physical systems modelling and decision making in complex systems Design methodology for HMS Intelligent maintenance systems Model-driven systems engineering Application of mechatronic principles

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Embedded Cell Count Algorithm for Cultured Tissue Characterization

Embedded Cell Count Algorithm for Cultured Tissue Characteri...

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18th International-Federation-of-Automatic-control (ifac) Conference on Technology, Culture and International Stability (TECIS)

作者： Yusifli, Elmar Yahiaoui, Reda Lajoie, Isabelle Yusifov, Salahaddin UBFC Besancon Nanomed Lab Besancon France Femto ST Inst Besancon France Bourgogne Franche Comte Univ Besancon France Azerbaijan State Oil & Ind Univ Baku Azerbaijan

Regenerated tissue is a one of the wide developing research topics of nowadays. the characterization of tissue in culture permits to regulate its final mechanical properties and to test the influence of pharmaceutical and cosmetic products on it. For this purpose, an embedded vision system was developed in order to characterize the mechanical properties of tissue in culture. thus, the aim of the present study was to develop an embedded, automated and portable cell count algorithm which can quantify the fibroblast cells from the fluorescent images taken by developed FPGA driven embedded high definition (HD) camera module. the developed algorithm was integrated into "uCell" software and tested on fluorescent images. the automated cell counting results were compared with manual counting and showed that the algorithm is reliable in 95% percentage of cases. (C) 2018, ifac (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： biomedical systems Embedded Vision systems Image Processing Algorithms control Application

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Improved sampled-data implementation of derivative-dependent control

Improved sampled-data implementation of derivative-dependent...

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Joint Meeting of the 2nd ifac Workshop on Linear Parameter Varying systems (LPVS) / 9th ifac symposium on Robust control Design (ROCOND)

作者： Selivanov, Anton Fridman, Emilia Tel Aviv Univ Sch Elect Engn Tel Aviv Israel

We consider an LTI system of relative degree two that can be stabilized using the output and its derivative. the derivative is approximated using a finite difference, what leads to a time-delayed feedback. this feedback is analyzed using a Lyapunov-Krasovskii functional that compensates the derivative approximation error presented in an integral form. We show that if the derivative-dependent control exponentially stabilizes the system, then one can use consecutively sampled measurements to approximate the derivative and this approximation will preserve the stability if the sampling period is small enough. We provide linear matrix inequalities that allow to find admissible sampling period and can be used for robustness analysis with respect to system uncertainties. the results are demonstrated by two examples: 2D uncertain system and the Furuta pendulum. (C) 2018, ifac (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Linear systems

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Synchronization Analysis of Piecewise-Linear Lur'e systems under Sampled-Data control

Synchronization Analysis of Piecewise-Linear Lur'e Systems u...

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Joint Meeting of the 2nd ifac Workshop on Linear Parameter Varying systems (LPVS) / 9th ifac symposium on Robust control Design (ROCOND)

作者： Zani, Antonio Flores, Jeferson V. Gomes da Silva, Joao Manoel, Jr. Univ Fed Rio Grande do Sul Sch Engn Ave Osvaldo Aranha 103 BR-90035190 Porto Alegre RS Brazil

this article addresses the master-slave synchronization problem of chaotic Lur'etype systems under sampled-data control. In particular, the system nonlinearity is assumed to be described by a piecewise-linear function. Based on a Lur'e-type Lyapunov function and a looped functional approach, LMI-based conditions are formulated to ensure that the difference between master and slave states converges asymptotically to zero provided that the time interval between two consecutive samples respects some bounds. An optimization problem is then proposed to determine the maximum allowable time between two successive samples in order to guarantee the synchronization. A Chua's circuit example illustrates the result. (C) 2018, ifac (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Synchronization sampled-data control aperiodic sampling Lur'e systems looped-functional LMI

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Unified Approach to the Analysis and Performance Evaluation of Sampled-Data control Applied to Nonlinear systems

Unified Approach to the Analysis and Performance Evaluation ...

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Joint Meeting of the 2nd ifac Workshop on Linear Parameter Varying systems (LPVS) / 9th ifac symposium on Robust control Design (ROCOND)

作者： Gabriel, Gabriela W. Geromel, Jose C. Univ Campinas UNICAMP Sch Elect & Comp Engn FEEC Campinas SP Brazil

this paper presents a general and unified approach to the stability and performance analysis of Markov jump nonlinear systems governed by a state feedback sampled-data control law, where the sampling instants are evenly spaced. Initially, the closed-loop system is equivalently described as a hybrid system. then, mean square stability and performance optimization of the general nonlinear hybrid system are addressed. this study is based on the existence of a solution of a Two-Point Boundary Value Problem (TPBVP) composed by a Hamilton-Jacobi-Bellman Equation (HJBE) and defined in the time interval corresponding to two consecutive sampling instants. Solving this TPBVP implies that the performance index of interest is exactly evaluated. Additionally, a numerical method is proposed to cope with the H-2 framework. In this case, a guaranteed upper bound to the referred index is obtained. Examples illustrates the proposed theoretical results. (C) 2018, ifac (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Sampled-data control systems nonlinear systems optimization problems Markov parameters

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An Improved LMI-based Approach for the Design of Power System Damping controllers

An Improved LMI-based Approach for the Design of Power Syste...

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Joint Meeting of the 2nd ifac Workshop on Linear Parameter Varying systems (LPVS) / 9th ifac symposium on Robust control Design (ROCOND)

作者： Bernardo, Raul T. Oliveira, Ricardo C. L. F. Dotta, Daniel Univ Campinas UNICAMP Sch Elect & Comp Engn Campinas SP Brazil

this paper presents a less conservative LMI-based method for the coordinated design of robust decentralized damping controllers in the power systems context. the algorithm results from modifications made in a previous LMI design procedure widely explored in the literature. More precisely, slack variables are introduced in the synthesis procedures to remove structural constraints on the Lyapunov matrix, potentially reducing the conservativeness inherent in this type of approach. the advantage of the proposed technique is verified in an IEEE benchmark power system application and the designed controller performance is observed with eigenvalue analyses and non-linear time domain simulations. (C) 2018, ifac (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Power systems Stability Linear Matrix Inequalities Robust control Coordinated control Design Damping controllers

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Robust Estimation of Forces for Suspension System control

Robust Estimation of Forces for Suspension System Control

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Joint Meeting of the 2nd ifac Workshop on Linear Parameter Varying systems (LPVS) / 9th ifac symposium on Robust control Design (ROCOND)

作者： Reichhartinger, M. Falkensteiner, R. Horn, M. Graz Univ Technol Inst Automat & Control Graz Austria

In this paper a novel approach for observer-based suspension control is presented. the control concept consists of two parts: An unknown-input state observer estimating both unknown forces acting upon the suspension system and a model-based control algorithm. the major advantage of the proposed concept is that it does not require the knowledge of uncertain wheel parameters. the observer relies on ideas of sliding mode control whereas the control algorithm pursues the goal of adjusting a desired suspension damping with the help of disturbance feedforward. the performance of the concept is demonstrated in numerical simulation and experiment. (C) 2018, ifac (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： active vehicle suspension sliding mode based estimation active damping control automotive control unknown input observer

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Gain-Scheduled H_∞ control for Discrete-Time Polynomial LPV systems Using Homogeneous Polynomial Path-Dependent Lyapunov Functions

Gain-Scheduled <i>H</i><sub>∞</sub> Control for Discrete-Ti...

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Joint Meeting of the 2nd ifac Workshop on Linear Parameter Varying systems (LPVS) / 9th ifac symposium on Robust control Design (ROCOND)

作者： Rodrigues, L. A. Camino, J. F. Peres, P. L. D. Univ Campinas UNICAMP Sch Mech Engn Campinas SP Brazil Univ Campinas UNICAMP Sch Elect & Comp Engn Campinas SP Brazil

this paper provides linear matrix inequality (LMI) analysis and synthesis conditions for the design of H-infinity robust and gain-scheduled static output feedback controllers, for discrete-time linear parameter-varying systems. It is assumed that the system matrices have a homogeneous polynomial dependence of arbitrary degree on the time-varying scheduling parameters, which are assumed to vary inside a polytope and to have known bounds on their rates of variation. the geometric properties of the polytopic domain are exploited in order to derive a finite set of LMIs that takes into account bounds on the variation rate of the scheduling parameters. LMI conditions are obtained using a quadratic Lyapunov function with a homogeneous polynomial dependence on the scheduling parameters at successive instants of time. Numerical results show the benefits of the proposed approach. (C) 2018, ifac (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Discrete-time Time-varying systems H-infinity performance robust control gain-scheduling static output feedback LMIs

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Robust Nonlinear control Applied to a control Moment Gyroscope with SISO Configuration

Robust Nonlinear Control Applied to a Control Moment Gyrosco...

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Joint Meeting of the 2nd ifac Workshop on Linear Parameter Varying systems (LPVS) / 9th ifac symposium on Robust control Design (ROCOND)

作者： Toriumi, Fabio Y. Angelico, Bruno A. Univ Sao Paulo Dept Engn Telecomunicacoes & Controle Escola Politecn Sao Paulo Brazil

this paper presents a robust nonlinear control design for a control moment gyroscope (CMG) in its single-input/single-output (SISO) configuration. the CMG unit, model 750 from Educational control Products, is described, as well as its SISO dynamics. the control design is based on a sliding-mode control approach and aims at tracking a desired output trajectory in a wide operational range, despite uncertainties on some model parameters and output disturbances. Results are obtained from both numerical simulations and real-time practical experiments to validate the controller. (C) 2018, ifac (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Sliding-mode control Gyroscopes control applications Dynamic systems Single-input/single-output systems Nonlinear control Robust control

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Aperiodic sampled-data control for LPV systems under input saturation

Aperiodic sampled-data control for LPV systems under input s...

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Joint Meeting of the 2nd ifac Workshop on Linear Parameter Varying systems (LPVS) / 9th ifac symposium on Robust control Design (ROCOND)

作者： Palmeira, A. H. K. Gomes da Silva, J. M. ., Jr. Flores, J. V. Univ Fed Rio Grande do Sul Sch Engn Porto Alegre RS Brazil

this paper addresses the problem of aperiodic sampled-data control of linear parameter varying (LPV) systems under input saturation. It is explicitly assumed that plant scheduling parameter can continuously vary between two sampling instants, while the control signal is computed using the measurement of this parameter only at the sampling instants. Assuming an affine parameter dependence, conditions based on the use of a parameter dependent (PD) looped-functional and a PD generalized sector approach, are proposed to compute a sampled-data LPV state feedback control law that ensures the regional asymptotic stability of the closed-loop system. LMI-based optimization procedures to maximize an estimate of the region of attraction of the origin or the allowable bound on the intersampling interval for a guaranteed region of stability are proposed. (C) 2018, ifac (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： LPV systems sampled-data control input saturation looped-functionals

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