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2013 International Conference on applied Mechanics,Materials,and Manufacturing(AMMM 2013)

作者： Juraj Kapusta Juraj Camber Gabriel Hulkó Institute of Automation Measurement and Applied InformaticsFaculty of Mechanical EngineeringSlovak University of Technology

Nowadays,the achievement of proper steel billets temperature profile is not the only design priority of induction heaters for hot forming applications. Due to its high operating costs,its design is constantly improving in terms of electrical and thermal efficiency. Therefore the more efficient multi-coil design starts to be more used in industrial practice. Numerical model of mentioned heater based on partial differential equations were solved by finite element method in virtual software environment. Primary goal of computer modeling was to investigate the thermal dynamics of four-module heater working in steady-state operation regime. Obtained data were applied to design an advanced control circuit based on distributed parameter systems theory. This may open up the opportunity to make further progress in induction heaters design.

关键词： Induction heating of steel Material properties Virtual software environments Temperature field Control Distributed parameter system

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Control of Continuous Steel Billet Induction Heater as Distributed Parameter System

Control of Continuous Steel Billet Induction Heater as Distr...

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International Conference on Process Control

作者： Juraj Camber Juraj Kapusta Gabriel Hulko Institute of Automation Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology

ISBN: (纸本)9781479909261

Industrial induction heating represents the environmentally clean, contactless method of steel heating. Same time it has high energy consumption, so in recent years, more efficient modular topology of heaters were introduced. Due to its multiple power modules, there is a possibility to apply the distributed parameter system control theory. By the usage of COMSOL Multiphysics solution, the model in the form of lumped-input and distributed-parameter-output system has been built. The process control is performed on the relations between the coil currents fed into four separate modules of heating device and desired billet temperature profile.

关键词： Distributed parameter system Induction heating Temperature field Control COMSOL Virtual software environments

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IMC Based Robust Controller Design for Distributed Parameter Systems

IMC Based Robust Controller Design for Distributed Parameter...

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International Conference on Process Control

作者： Cyril Belavy Filip Vitalos Marcel Vlcek Stanislav Lel'o Marek Michalecko Institute of Automation Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology in Bratislava

ISBN: (纸本)9781479909261

In the paper, the robust control of temperature fields of the casting mould in the benchmark casting plant is presented. Temperature fields of the mould are represented by dynamic models in the form of a finite-dimensional approximation of distributed parameter systems. Models are created by means of an experimental identification. The control synthesis is decomposed to the time and space domain. For the control synthesis with internal model control structure in the time domain, an uncertainty of the controlled system is considered and robust controllers are designed.

关键词： Distributed parameter systems Uncertainty Robust control Temperature field Casting mould

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Adaptive Control Design for Vehicle Suspension

Adaptive Control Design for Vehicle Suspension

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International Conference on Process Control

作者： Monika Zuscikova Milan Loksik Vladimir Villaverde Huertas Cyril Belavy Institute of Automation Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology in Bratislava

ISBN: (纸本)9781479909261

This paper addresses the adaptive control design of a semi-active suspension system. The control system is focused on the driving comfort criteria. For this purpose, it is necessary to emphasize on modeling and connection between vehicle suspension system components. On the other hand, we will compare the obtained results using the designed adaptive control system with the optimal control design applying soft and hard suspension. Moreover, a hydro-pulse will be used for road vibration simulation purposes. In this case, the analysis has been performed over the frequency bandwidth 4-20 Hz considering a constant vehicle speed 80 km/h.

关键词： Semi-active suspension Full-car model Semi-active damper Adaptive control Optimal control

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Real-time Implementation of an Adaptive Feedback and Feedforward Generalized Predictive Controller

Real-time Implementation of an Adaptive Feedback and Feedfor...

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International Conference on Process Control

作者： Martin Gulan Michal Salaj Boris Rohal'-Ilkiv Institute of Automation Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology in Bratislava

ISBN: (纸本)9781479909261

This paper is devoted to the measurable disturbance rejection problem in Generalized Predictive Control (GPC) using an adaptive GPC controller, which combines the process of on-line system identification and the process of generalized predictive feedback controller design. In this work, the GPC algorithm is extended to the case when the measurable disturbances are available for feedforward control. The proposed adaptive GPC algorithm with/without future disturbance compensation is implemented in real time and experimentally demonstrated for the application of motor revolutions tracking when subjected to deterministic and pseudo-random disturbance signals. The constraint handling capabilities of the controller are considered as well.

关键词： FEEDFORWARD GYPC gene System identification Predictive controllers Controllers Disturbance rejection Self tuning deterministic controller design

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On-line Identification Using Hybrid Method of Regularized Exponential Forgetting

On-line Identification Using Hybrid Method of Regularized Ex...

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International Conference on Process Control

作者： Jan Vachalek Institute of Automation Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology in Bratislava

ISBN: (纸本)9781479909261

The paper compares the ability of forgetting methods to track time varying parameters using various method of regularized exponential forgetting (REF). Three forgetting methods are analyzed in this paper: regularized exponential forgetting, second is regularized exponential forgetting with alternative covariance matrix (REFACM) and third is the novel hybrid regularized exponential forgetting method with a choice to disable or enable alternative covariance matrix (HREFACM). The comparison is performed in the terms of the quality of the observed output parameters. The observed parameters for all benchmarks are the integral sum of the Euclidean norm of the deviation of the parameter estimates from their true values (IS) and a selected band prediction error count (PE). As a supplementary information the eigenvalues of the covariance matrix are observed. All algorithms are validated by simulations in the Matlab Simulink software environment.

关键词： variance covariance matrix forgetting Euclidean norm Exponential Covariance matrix on-line identification BENCHMARKS time varying parameters

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Control of Billet Temperature Field by the Secondary Cooling in Continuous Casting of Steel

Control of Billet Temperature Field by the Secondary Cooling...

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International Conference on Process Control

作者： Karol Ondrejkovic Pavol Noga Lukas Tkac Gabriel Hulko Pavol Bucek Institute of Automation Measurement and Applied Informatics Slovak University of Technology in Bratislava Zeleziarne Podbrezova Research and Development Center

ISBN: (纸本)9781479909261

The paper presents simulation study on control of temperature field of steel billet during continuous casting. The cooling of steel billet is controlled with secondary cooling zone - a set of water jets divided into independent subzones. The temperature field evolution in time and space is described by non-linear partial differential equation. The solution of this equation is obtained numerically, using specialized finite element software ProCAST. Lumped-input and distributed-parameter-output system (LDS) is introduced, with the inputs being cooling water flow rates and the temperature field being the system's distributed output. Control synthesis in the system's feedback is solved in space and time direction. To represent the temperature field during setpoint changes a co-simulation interface was added to the DPS Blockset (Third-Party software product of The MathWorks). The interface block enables you to couple a finite element simulation in ProCAST and control scheme in Simulink. This feature brings you the full power of Simulink to extend the capabilities of finite element simulation.

关键词： Continuous casting Steel billet Temperature field Control Lumped-input and distributed-output system Distributed parameter system Co-simulation

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New possibilities of industrial programming software

New possibilities of industrial programming software

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International Conference on Process Control (PC)

作者： Pavol Seman Martin Juhás Lukáš Tkáč Marek Honek Institute of Automation Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology in Bratislava Bratislava Slovakia

Recent developments in the area of industrial programing software expand the potential of the automation programs considerably. In addition to IEC 61131-3 languages, programming languages like C and C++ are getting available for industrial controllers, which opens new possibilities of reusing existing programs for real time processing in these controllers. Paper deals with swing-up and online model predictive control of mechatronic device - reaction wheel inverted pendulum. Swing-up control uses convenient shape of exponential function over pendulum position for determination of required energy to be delivered to the system. For stabilization of pendulum in the upright position a predictive controller based on optimal control law with perturbation was used. An important part of the solution is PLC implementation of qpOASES package for numerical solution of quadratic optimization problem. Application is implemented and tested using industrial PLC connected to a laboratory pendulum.

关键词： Wheels Mathematical model automation Process control Cost function Software packages

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Vibration Suppression of a Flexible Structure

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Procedia Engineering 2012年 48卷 233-241页

作者： Vladímir Villaverde Huertas Boris Rohaľ-Ilkiv Institute of Automation Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology in Bratisava N‡mestie Slobody 17 812 31 Bratislava Slovak Republic

This work addresses the solution to the problem of active vibration suppression of a cantilever beam using piezoelectric actuation. For this purpose, we are taking advantage of the effectiveness of the positive position feedback control strategy (PPF) in order to control first mode vibrations of the analyzed beam. This control technique is well-known in the literature as a modal control method for vibration attenuation. The PPF controller accomplishes its best performance if tuned properly to the characteristics of the structure to be controlled. According to this we are going to realize the modal analysis of the cantilever beam utilizing the finite element method in Ansys to determine the structural frequency corresponding to the first mode, which is used as PPF controller frequency. On the other hand, we shall obtain the state-space representation of the cantilever beam using the subspace identification method in frequency domain applying the fast fourier transformation (FFT). Furthermore, we will simulate the discrete-time PPF controller using Matlab/Simulink. Lastly, the simulink designed discrete-time PPF controller will be tested using an xPC Target real-time system.

关键词： Piezoelectric Actuation Positive Position Feedback Vibration Suppression Modal Analysis Subspace Identification Method

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Moving Horizon Observer for vibration dynamics with plant uncertainties in nanopositioning system estimation

Moving Horizon Observer for vibration dynamics with plant un...

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American Control Conference (ACC)

作者： Tomáš Polóni Arnfinn Aas Eielsen Boris Rohal'-Ilkiv Tor Arne Johansen Institute of Automation Measurement and Applied Informatics at the Faculty of Mechanical Engineering Slovak University of Technology Bratislava Slovakia Department of Engineering Cybernetics at the Norwegian University of Science and Technology Trondheim Norway

ISBN: (纸本)9781457710957

This paper considers the estimation of states and parameters of a Single-Degree-of-Freedom (SDOF) vibration model in nanopositioning system based on a nonlinear Moving Horizon Observer (MHO). The MHO is experimentally tested and verified on measured data. The information about the displacement and speed together with the system parameters and unmodeled force disturbance is estimated through the Sequential Quadratic Programming (SQP) optimization procedure. The MHO provided superior performance in comparison with the benchmark method Extended Kalman Filter (EKF) in terms of faster convergence.

关键词： Vectors Noise Mathematical model Vibrations Covariance matrix Force Equations

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