Conference Program

Program of section Modeling

Lectures

 

Ivo Petras, Dagmar Bednarova:
Identification of dynamical system in state space: A total least squares approach
Presenter(s): Petras, Ivo

Abstract

This paper deals with a new identification method in state space for mathematical modelling of the dynamical systems. The system is described by differential equation with constant coefficients. Identification algorithm is based on the total least squares approach, where cost function is defined as sum of the orthogonal distance between measured data and its mathematical model. An experimental example (laboratory electrical heater) is shown.

 

Bogdan Sapinski:
NUMERICAL CALCULATIONS OF A VIBRATION POWER GENERATOR FOR A LINEAR MR DAMPER
Presenter(s): Not defined.

Abstract

 

Martin Švejda:
OPTIMAL KINEMATIC DESIGN OF PARALLEL SPHERICAL WRIST MANIPULATOR
Presenter(s): Švejda, Martin

Abstract

The paper deals with the optimal kinematic design of 3 rotation degrees of freedom parallel Spherical Wrist Manipulator.

 

Ľ. Dorčák, J. Terpák, M. Papajová, L. Pivka:
IDENTIFICATION OF FRACTIONAL-ORDER DYNAMICAL SYSTEMS AS A NONLINEAR PROBLEM
Presenter(s): Not defined.

Abstract

POSTER Because of the higher complexity and the absence of adequate mathematical tools, fractional-order dynamical systems were only treated marginally in the theory and practice of control systems, regardless of the reality and negative consequences caused by neglecting the real order of the system. Real objects in general are fractional-order systems, although in some types of systems the order is very close to an integer order. Since major advances have been made in this area in the last years it is possible to consider also the real order of the dynamical systems. Such models are more adequate for the description of dynamical systems than integer-order models. With regard to this, in the task of identification, it is necessary to consider also the fractional order of the dynamical system. In this contribution we will concentrate mainly on the identification of parameters (including the order of derivatives) for a chosen structure of the model with emphasis on the methods of evaluation of transfer characteristics. We consider systems whose mathematical descriptions are differential equations in which the orders of derivatives α, β can be real numbers: (1) a2, a1, a0 are arbitrary constants. In the case a2 = 0 we have two-term FO differential equation. We give also a numerical solution of differential equations of this type. The presented method of identification is a combination of the method of differentiation of step responses and classical least squares method. In general it is necessary to identify the real orders of derivatives. Under this assumption, we would obtain a system of nonlinear equations. The obtained results of parameter identification by proposed optimization method will be compared with method based on optimization methods. The verification of the correctness of parameter identification will be done by using it in systems with known parameters. This work was partially supported by grants VEGA 1/0404/08, 1/0365/08 and APVV-0040-07 from the Slovak Grant Agency for Science.

 

I. Pintér, I. Lajtai:
SIMULATION OF RBF-MRAC NEUROCONTROLLER
Presenter(s): Pintér, István

Abstract

The simulation results are presented in case of several reference signals (unit step function, periodic pulse and ramp trains, sine wave). The behavior of the investigated RBF-MRAC system is presented in three types of figures, namely a) the reference input signal - reference model output - regulated plant output – control law, b) nonlinearity estimation error vs. output error, c) evolution of approximations of nonlinearity during simulation. The simulation program makes possible the study of the RBF-MRAC system, helps in determining the parameters of the RBF-network (number of neurons, their centers and widths, the best weight-vector) and also helps in determining the number of iteration steps necessary to access the acceptable output error. That is, using the simulation program, the PLC-application developer can more conveniently implement the system in ST language.

 

Imre Kelényi, Jukka K. Nurminen, Péter Ekler:
MODELLING AND SIMULATION OF ENERGY EFFICIENT MOBILE CONTENT SHARING BASED ON BITTORRENT
Presenter(s): Not defined.

Abstract

BitTorrent is currently the most widely used peer-to-peer content sharing protocol. Initially available only for desktop computers, now it has been adapted for a wide range of devices, including mobile phones. The most significant problem with using BitTorrent on handheld devices is the energy consumption: standard usage can drain the battery of an average smartphone in about five hours. Currently there are only a few proposed solutions for achieving more energy efficient operation for peer-to-peer content transfer, one of these is BurstTorrent, our protocol extension which exploits the fact that the energy per bit rate during wireless transfers is lower if the data is transferred in high speed bursts instead of at a steady but slower speed. In addition to giving a brief explanation of the key ideas behind BurstTorrent, the main focus of this paper is to describe the simulation and modeling techniques used for developing and validating the protocol. We performed flow-level simulations with a simulator based on the ns-2 simulation framework. The main purpose of the simulations is to show how BurstTorrent performs compared with standard BitTorrent in terms of energy consumption and download time. We analyzed how BurstTorrent compares with standard BitTorrent using several different strategies for the energy-limited peers, such as energy-limited peers only download the content (free riding) and energy-limited peers also share the data by uploading it to other peers. The results show that BurstTorrent clearly outperforms standard BitTorrent in almost all cases in terms of the energy consumption of mobile peers.

 

I. Kostial, A. Olijar, J. Spisak, J. Mikula:
MATHEMATICAL MODEL OF CAUSTIC MAGNESIA CALCINATION IN MICROFLUID FURNACE
Presenter(s): Kostial, Imrich

Abstract

For the granular materials thermal treatment the unified modelling system has been developed. It consists from program modulus from which individual furnace model can be generated. For the model generation elementary balance method was used. Advantage the elementary balance method is its implicit stability. Model of each element includes transfer processes, transformation processes and accumulation processes. Generation of the individual models includes model formulation and parameters determination. Model formulation is based on first principles, heuristics and empirical results. Parameters determination is generally based on priory information, but has to take into account specific conditions. For their determinations, special procedures based on laboratory, pilot and full scale experiments have been used. For the quantitative application the developed model has to be calibrated. As the standard for the calibration the operating furnace can be used. For model calibration of non existing furnace the priory knowledge can be used. In this case model adequateness is on qualitative level only. Developed modelling system was applied on magnesite calcinations in the microfluid furnace. In the paper is the short description of the furnace. Created mathematical model includes the following modules: materiel flow, fluid flow, heat generation, heat transfer, heat utilisation and material transformation processes. Calcinations kinetic equations parameters were determined based on laboratory experiments. The results were gained by simulation of experiment Model was calibrated on experimental furnace. Simulations were used for the technical and operational optimisation. The model is part of the developed supervisory control system.

 

K. Polcova, I. Kostial, J. Spisak, D. Nascak:
VIZUALISATION OF THE MIKROFLUID FURNACE IN THE VIRTUAL REALITY
Presenter(s): Not defined.

Abstract

3D visualisation tools are presently already used in many areas including production area. Its application in technological processes presents important direction of their innovation. Graphical models of technological equipments and processes presented in the virtual reality environment can be effectively used as replacement of the real plant. By their synthesis with the mathematical models is created space for process improvement in the design and operation stage. For the process improvement effective visualisation tools principally facilitate problems solution by intuitive understanding of problematic places or by optimisation of the new solution. Visualisation system is realised on several levels. The basic form is static 3D graphic model. At higher level needs for interactivity have to be regarded. In our case it means possibility to change the object parameters. Process visualisation is one of the system components. Presented information can be data gained from real objects or from simulation mathematical models. Visualisation and monitoring part is connected through the database. By combination of data gained by simulation and from the environment we obtain augmented virtual reality. Further objective is to create digital plant by the interconnection of realised visual applications. Programming language for imaging in the virtual reality is modelling multiplatform language VRML. Designed visualisation system enables spatial presentation, interactivity, user easiness, platform independency and is financially undemanding. In the paper its application on micro fluid furnace for granular material thermal treatment is presented. Presentation includes application of developed tools for design and operation support. In the design part shall be presented real time object manipulation. In the operation part process course shall be presented as operator support.

 

D. Nascak, J. Astalos, I. Kostial, J. Spisak, J. Mikula:
PARALLEL SIMULATION MODEL OF THERMAL PROCESSES
Presenter(s): Not defined.

Abstract

Mathematical model is issue element of digitalisation of technological objects and processes. For effective application of the mathematical model the key element is model adequacy and the computing time. Model adequacy is generally increasing by the model complexity, which has its repercussion in the increased simulation time. Simulation can be accelerated by suitably selected algorithm or a by increasing the computing power. The computing power can be increased by using more powerful CPUs or by using multi-core CPUs. Actual trends are to integrate more computing cores into one CPU. However sequential models cannot use multi-core CPUs and they need to be modified for parallel processing. Parallel programming enables programmer to develop an application, which is much more functional than sequential application. Nowadays the parallel programming is becoming more used because of high computing power of graphic adapters (GPU). Current GPUs have tenths of computing cores and they are able to provide much more computing power than normal CPUs. Graphic accelerators with high parameters for professional use are available near the standard adapters, which are for normal usage. These accelerators have till 1 or 2 GB of graphic memory and contain drivers support for professional modelling as CAD and other systems. To exploit computing power of GPU it is not necessary to modify whole application, it is adequate to modify just computationally difficult parts. The important part of the paper will consist of the description of mathematical model modification needed for parallel processing. Model was designed for simulation of granular materials thermal treatment. Present application is for simulation of processes in microfluid furnace. Results include comparison of using selected GPUs, single-core and multi-core CPU. They the allow analysis of the applicability of GPUs for required purpose.

 

J. Lisuch, J. Mikula, I. Kostial, M. Zelko:
MODELING OF HIGH-REVOLUTION ROTARY FURNACES WITH CONTROLLED SHELL COOLING
Presenter(s): Kostial, Imrich

Abstract

Rotary furnaces belong to the principal thermal apparatuses for granular materials thermal treatment. Their main insufficiency is high specific fuel consumption and low specific production rate. The classical rotary furnace works at low revolutions, usually about 1 rev/min. Based on kiln diameter and filling degree, the batch is moved by sliding or by down pouring. The low specific output is caused by low exchange surface and low heat transfer inside the furnace. The high specific heat consumption is determined by high heat losses. The important impact has furnace shell heat losses, which can be higher than 30%. For the improvement the high-revolution rotary furnace with controlled shell cooling was designed. By these solutions the intensity of heat transfer has significantly increased and furnace shell heat losses have decreased. The shell heat is reused for the combustion air pre-heating. The high-revolution rotary furnace works on the mechanical fluidisation principle. By the centrifugal forces the batch is drifted to the furnace walls and is falling down because of gravitational forces. At certain revolution material is evenly distributed through the whole furnace diameter. By this way optimal conditions for heat transfer because of the large heat-exchange surface are created. The heat transfer coefficient is because of increased material and rotary speed also significantly increased. Furnace controlled cooling is based on the principle of reduction of heat losses through the furnace shell and on heat utilization outgoing into the surroundings on preheating of the combustion air. The research of high-revolution rotary furnace kiln with controlled shell cooling was realized by physical and mathematical modelling and the high-revolution technology was verified on the experimental furnace. Fluidization process was examined by physical model. Research experiments confirmed that at the critical revolutions of the material is evenly distributed along the furnace cross section and independently participates on the heat transfer. Created mathematical model has modular structure. It includes processes inside the furnace and in the furnace shell. The simulation model is based on the elementary balance principles. The model was calibrated on the pilot appliance. The simulation experiments were implemented for the magnesite calcinations process. The results confirmed the possibility to increase ten times production intensity and of 30% energy consumption decreasing.

 

J. Spisak, A. Babjakova, J. Lisuch:
HIERARCHICAL OPTIMISATION MODEL OF THE MINING PRODUCTION PROCESS
Presenter(s): Not defined.

Abstract

Presented contribution describes principals of the generation of the hierarchical model of row materials mining and processing. The developed model is generated on the material balance level, capacity balance level and on economical (cost) balance level. It will be used on the factory operative level for generation of operative plans as far as for factory capacity and production cost optimisation. On the strategic management level it will be used for simulation of designed optimisation measures in the material flow and technological process and for technical – economical evaluation of consecutive investment intensions. In the framework of this contribution generated hierarchical optimisation model for magnesite treatment in SMZ Jelsava will be presented and the experiences with its generation and applications are described. Presented model is integral part of the prepared complex factory innovation designed as “Digital factory”. This project is based on informatisation and digitalisation of the factory processes and is based on their deep understanding with the objective of their further development in the framework of SMART mining factory. Digital mining factory will consist from mathematical models of technological and auxiliary production processes outlined in the way that they could be used for production optimisation and of in it consisting material flows.

 

V. Sindler, J. Spisak:
CAPACITY PLANNING MODEL FOR BASIC REFRACTORY PRODUCTION
Presenter(s): Not defined.

Abstract

In this contribution are described principles and procedures to create new plant planning system dealing with basic refractory production. From the point of its production program it is a homogeneous production plant with substantial production process segmentation to continuous and discrete technological nodes. From the point of material flow control it is combined system with domination of Push philosophy. Only the final substance mixture and expedition is controlled by Pull philosophy. Presently customers (market) require more and more specific products with attributes that sharply meet their production technology. Required product diversity creates pressure on the adaptable technology and on the transfer from standardized production to custom-built production. These changes require also new production planning process system design on the level of tactical-aggregated planning. The current system of operational planning based on Gantt charts utilisation plus an added reuse of heuristic principles within problem solving is adaptable on new conditions also. The proposed aggregated planning system is presented by the three following mutually interconnected models: • Customer-built logistics model – It is defining customer requirements on the production. It has the verifying ability of two subsequent models and the processing of mandatory orders from customers into the concrete production tasks for a particular production departments planning. • GIS of mining operation – It is defining the space and time availability of various basic raw materials quality for a customer required types of basic fire resistant substances production. Hierarchical balance sheet model of raw material processing to the product. It is based on the material, capacity and cost balance of the production process. Its task is to determine the possibilities of capacity and economic production planning. The developed planning model was applied for SMZ plc. Jelsava.

 

Péter Ekler, Tamás Lukovszki, Imre Kelényi:
THE ACCURACY OF SIMILARITY CALCULATION IN PHONEBOOK-CENTRIC SOCIAL NETWORKS
Presenter(s): Not defined.

Abstract

Social networks are becoming increasingly popular nowadays. The increasing capabilities of mobile phones enable them to participate in such networks. Besides that there are already many social networks related application for these devices. However we should consider the fact, that the phonebooks in the mobile devices represent social relationships that can be integrated in the social networks. Following we refer to this solution as phonebook-centric social networks. Such networks provide a synchronization mechanism between phonebooks of the users and the social network which allows detecting network members listed in the phonebooks (semi-) automatically. The detection of those members is based on the similarity of the personal data, e.g., similar name, same phone number, address, etc… Users can mark similarities between their phonebook contacts and members in the network. This way, if one of their contacts changes her or his personal detail, it will be propagated automatically into the phonebooks, after considering privacy settings. However this synchronization mechanism can be resource intensive based on the amount similarities in the network. Estimating the total number of similarities is a key issue from scalability point of view. We implemented a phonebook-centric social network, called Phonebookmark and investigated the structure of the network. We experienced that the distribution of similarities follows a power law. A model was proposed by us, which can be used to calculate the total number of similarities. However the accuracy of the model is another question, because of the infinite variance of the power law distribution. We discovered that in some cases there is a reasonable upper bound in case of power law distribution which can be used to model the variance efficiently. This model can be used to prove the accuracy of the similarity calculation. In this paper we describe the architecture of phonebook centric social networks and we propose an accurate model to calculate the total number of similarities in the system. The theorem related to the accuracy can be used generally in case of other power law based distribution where the described upper bound is valid.

 

Levente Hunyadi and István Vajk:
Fitting an implicit model in the errors-in-variables context
Presenter(s): Not defined.

Abstract

A recurring problem in engineering is constructing a computer model from a physical one. A large mass of unorganized coordinate data can often be acquired with a measuring system, but the data are observed with noise due to surface attributes of the physical object, impact of the environment and uncertainty of the measuring device. The aim is thus to reconstruct the physical model in a way as to minimize the misfit between the reconstructed model and the true object. We present an approach that alloys clustering and generalized total least squares regression to detect groups in observations and estimate local parameters over naturally delineated domains in a noisy context.

 

Gunnar Künzel, René Neděla:
DYNAMIC ECONOMICAL MODELS
Presenter(s): Not defined.

Abstract

The principles of energy dynamical interactions which are formulated following a common language tool – from the branch of systems theory, are explained at introduction. It seems very useful for a mutual communication and especially an intersection communication. The analogy between physical elements and circuits and economic systems is shown as well. There are presented especially production and fiscal systems and their models from the analogy. Block diagrams of some economical models are stated. Demonstrations of models for regulating of economical stabilization policy have been presented among these systems. There is made an attempt at evaluation of access to economic modeling by means available on PC, in the next part. The simulations have been realized using MATLAB - Simulink software. In the end of article, author describes status quo (present state) and expected future of systems models at economy and possibilities their utilization in education.

 

Gunnar Künzel:
MODEL OF TENSIONING SERVOMECHANIS
Presenter(s): Not defined.

Abstract

The preface has been indicated by the principles of tensioning servomechanism for pulsation dynamometer for measuring of elastic characteristics of textile. The dynamometer consists of a loading installation unit - vibrator, test sample and of a tensioning mechanism, which is drawing-off a clamping jaw by such a way that the amount of tensile force in the textile material is to be constant. The goal is to replace the actual tensioning device with weights with a servomechanism with entered parameters. The paper presents a block diagram of the servomechanism and a behavior analysis of the designed tensioning servomechanism by means of transfer functions of individual blocks in the Laplace transformation. The stability when controlling the tensioning amounts at the sample and when controlling the amounts of its elongation is analyzed. Frequency response correction is introduced and transient curves of the designed servomechanism at the tension amount control and at the elongation amount in the material sample are monitored. Its computer model in the MATLAB-Simulink environment was created before the mentioned installation, and the simulation experiments for an optimal design of parameters of tensioning servomechanism have been realized.

 

Mircea I. Mihaiu:
ABOUT THE SIMULTION OF RECTIFIERFS AND REGULATORS CIRCUITS USED TO DESIGN RFID TAG
Presenter(s): MIHAIU, Mircea

Abstract

In the paper is presented the analysis of the main structure of the MOS transistors used as MOS diodes or MOS switches in RF rectifiers for RFID tags. We present 5 different kinds of rectifier structures for comparison. They are: NMOS bridge rectifier structure, NMOS with two MOS gate cross-connected bridge rectifier structure, PMOS bridge rectifier structure, PMOS with two MOS gate cross-connected bridge rectifier structure, gate cross-connected PMOS and NMOS bridge rectifier. Also the simulation of the typical regulator structure is presented. All the above structures are simulated with the MicroSim 8 software. The simulation results are presented in the paper.

 

Mircea I. Mihaiu:
THE ELECTRONIC MODEL OF MEMRISTORS BASED ON LED-PHOTORESISTOOR OPTOCOUPLERS
Presenter(s): MIHAIU, Mircea

Abstract

Memristors are a class of passive two-terminal circuit elements that maintain a functional relationship between the time integrals of current and voltage. In the paper is presented the similarity and differences between memristor and phototransistor We developed the new electronic models of the memristor based on known electronic devices such photoresistor and linear integrated circuits such AO. The memristor model can be used to understand the main functioning of the memristors and how to use such devices in some applications before the nanoscale memristor will be on the market. In the paper is presented the main circuit, and the main practical characteristics.

 

László Dudás:
NEW GEAR CONSTRUCTIONS TO IMPROVE CONTACT QUALITY
Presenter(s): Dudás, László

Abstract

The paper presents the Surface Constructor (SC) 3D kinematical modelling and simulation program intended for development of new types of complex contacting kinematical surfaces, especially gear surfaces. The paper introduces the theoretical background, the developed modelling software and four examples on improving gear connection. The first example validates the application comparing the calculated result to real manufactured gear. The other three examples present innovative new solutions in the area of worm gearing construction and manufacturing.

 

Tomas SKOVRANEK and Igor PODLUBNY:
IDENTIFICATION OF SYSTEMS USING ORTHOGONAL DISTANCE FITTING AND MATRIX APPROACH TO SOLUTION OF SYSTEMS OF FRACTIONAL DIFFERENTIAL EQUATIONS
Presenter(s): Not defined.

Abstract

In the present work a new method for identification of systems of arbitrary real order is described, based on using “matrix approach”, proposed recently by Podlubny, to obtain numerical solutions of systems of fractional differential equations, and on using orthogonal distance fitting in the formulation of proposed fitting criterion. The method is demonstrated on 2D and 3D cases.

 

MEHMET BOZCA:
COMPARISON OF UNDER LAPPED AND CRITICALLY LAPPED HYDRAULIC SPOOL VALVES PERFORMANCE
Presenter(s): BOZCA, MEHMET

Abstract

Abstract The purpose of this study is to compare the spool valve performance on the hydraulics system behaviour for the principal types of hydraulic control valves such as under lapped and critically lapped without applying any control law to the hydraulics system. Mathematical model of the spool valve-cylinder-load system is obtained for each type of valve. In application, hydraulic actuators are typically a single-acting hydraulic cylinder and valves are five port-spool valve. Actuator is selected based on desired velocity and acceleration. Differential equations are obtained from mathematical model. Mathematical models are arranged in the state-space form. Pressure, velocity and position are considered as state-variables. The state-space equations of system are solved by MATLAB program and pressure variations, velocity and position are shown as graphically. It is concluded in numerical study that under lapped valves can be used in fast applications which require a continuous flow and bigger velocity. Critically lapped valve is more desirable than under lapped valve in slow application, if fast velocity is not required for hydraulic systems. Keywords: under lapped, critically lapped, spool valve, hydraulic

Posters

 

Dagmar Bednarova, Ivo Petras, Igor Podlubny, Tomas Skovranek, Paul O'Leary:
Total least squares in modeling: Matlab toolbox

Abstract

This contribution deals with a mathematical method known as total least squares or orthogonal regression or error-in-variables method. This method can be used for modeling of the static and also dynamical processes. Wide area of application is signal and image processing. We present a Matlab toolbox which can solve basic problems related to the total least squares. Several illustrative examples are presented as well.

 

J. Terpák, P. Horovčák, P. Cirbes, Ľ. Dorčák:
SERVICE ORIENTED ARCHITECTURE IN HEATING PROCESS MODELING

Abstract

The contribution deals with service oriented architecture and its utilization for heating process modeling. It briefly characterizes basic service oriented architecture principles as well as web service as its dominating implementation form. It emphasizes an importance of uniform thermo-chemical properties source and thermodynamics computations for mathematical models creation. For technological processes models that include models of heating, heat generation and chemical reactions models there are necessary thermo-chemical properties and thermodynamics computations as: specific heat capacity, heat of formation, enthalpy, entropy, Gibbs energy etc. They are defined by exact value or they can be computed as temperature’s functional dependence. In the next part of contribution is characterized and described model of heating process with it’s particularly models of heat accumulation and convective heat transfer from the modeling point of view. Contribution specifies applied function dependency, data structure design and implementation of web service created for this purpose in typical developing desktop environment e.g. MATLAB. Algorithm of function generates class for web service interface, instance that represents web service, calls corresponding web service function with given parameters, performs conversion of web service XML output to MATLAB environment and extract required values to MATLAB variables. With utilization of MATLAB function various different variants were solved in the heating modeling process. It shows that solving modeling problems with service oriented architecture is a significant contribution for algorithms simplification in modeling of raw materials extraction and processing processes. Advantage is possibility to transfer complicated calculations to the server, what brings unloading of client out of ballast. Disadvantage (cost that has to be paid) is in the increased time of calculation caused by increased network communication.

 

P. Horovčák, J. Terpák, P. Cirbes, Ľ. Dorčák:
PROCESS MODELLING SUPPORTED BY WEB SERVICES AND CLIENT TECHNOLOGIES

Abstract

The contribution deals with possibilities of web service’s support of process modeling in different clients environments. Development of mathematic models of raw materials extraction and processing is collective work and therefore is necessary to have uniform source of thermo-chemical properties. For purposes of process modeling support there was proposed and developed specialized web service oriented on providing uniform and easily available source of thermodynamic, thermo-physical and physical properties of substances. Importance of unified source has in addition great significance in administration, actualization, data or services centralization as well as ability to provide network access. The service provides among others information about service itself, names and identification of all substances, range of temperature interval, molecular mass and heat of combination for the given substance, specific heat values, enthalpy, entropy, coefficient values for calculation of mentioned substance properties for given temperature value, all temperature intervals and coefficient values for given substance, summary of all values for given substance, list of web service error codes and meaning of particular error code. Output of web service is an XML structure that contains required data, coefficients, values or results of calculation. Service interactions are defined by markup language, typically XML. Each service interaction is independent and loosely coupled, so each interaction can operate independently from each other. Application of mentioned web service is possible in various web and desktop client environments; however client need to mine individual values from XML structure to corresponding environment variables. The next part of contribution deals with procedures of web service implementation for purposes of mathematical models in typical developing (internet and desktop) environments, e.g. PHP, AJAX, ASP, Java, MATLAB, whereby there are compared individual technologies with regard to advantages and disadvantages of their application for processes modeling.

 

Andrzej KOT, Agata NAWROCKA:
BALANCE PLATFORM SYSTEM MODELLING AND SIMULATION

Abstract

 

Agata Nawrocka, Andrzej Kot:
Biomedical sygnals in control systems

Abstract

 

F. Stinga, A. Soimu, D. Popescu:
Hybrid Control System for a Two-Tank Plant

Abstract

 

Marcin Apostoł, Andrzej Jurkiewicz, Piotr Micek:
Statistic analysis of the structure parameters of the hydraulic force generator

Abstract

Strings and anchoring discs (anchoring block) are one of the most important elements, which have influence on the quality of the prestressed structures. EN-PN-S-10040 norm, which has been valid since January 2000, requires the conduct of fatigue researches apart from static researches. The laboratory stand to static and fatigue researches was elaborated and made in the Laboratory of Research and Machine Analysis and Structures at AGH for this purpose. The stand enables the testing of presses, anchoring block, anchorages as well as prestressing systems. The stand consists of the carrying frame, hydraulic cylinders set and hydraulic, plunger vibration generator. The design of this stand was consistent with Euronorm and Eurocode, which require the obtaining high value of reliability parameters in the design stage as well as the testing stage. The definition of work parameters of generating vibration system and its influence on obtained vibration courses of the real tested structure with high requirements of safety demands expensive testing. The decomposition of the researched object was conducted and the aim of the research was established, which is to determine the functional relationship between the input value (diameter plunger dn (valve) double crank of connecting rod r and the angle of phase movement alfa of the division belt wheel), and the size of the input value which the momentary power M gen of the power generator network, input power Ma (active) of the electric engine and the velocity Vp and the movement xp of the hydraulic pushing element of the force vibration generator. For the accepted research plan, simulation research was conducted obtaining the function of the object which enables the calculation of the input values, determination of the function extreme of the object and the examination of the character and significance of the influence of each of the values on the individual exit value.

 

M. I. TODERICI, Simona N. TODERICI, Maria IMECS:
GENETIC ALGORITMS, AN MODERN APPROACH OF SOLVING COMPLEX AUTOMATION PROBLEMS

Abstract

The purpose of this synthesis is to create an overall picture about the control algorithms based on the evolutionary model. These methods offer a new and modern approach of solving complex problems seen in terms of automation and electrical drives controlled by computer algorithms. The modular approach also allows easy automation procedure: the genetic algorithm receives some parameters, which are processed and then will be selected the best results based on information provided by the evaluation function. This method allows a better response of the system by making changes to the evaluation function. In the case of using genetic algorithms on-line, by changing the evaluation function, results are generated in real time, the only condition is to ensure sufficient computing capacity in order to execute the genetic algorithm (in fact the execution of genetic algorithm and the response from the evaluation function must be in the interval that allows the system to react in real time). Because it takes a large computing capacity for the running the program in a very short time, genetic algorithms are not suitable in solving small problems with simple solutions because there will be always solutions that are cheaper and easier to implement. But if are considered complex problems, which don't have a clear solving algorithm, or there are some problems with few known data, the genetic algorithms and evolutionary methods in general are more suitable because they can offer solutions, which are otherwise difficult to obtain. The main advantage of genetic algorithms is that they don't have to deal with the problem itself, but especially with how encoding information or verification of solutions, so that this type of algorithm can be implemented for various problems by the non-specialists in its application field.

 

Patrícia Gróf, Béla Takarics, András Czmerk:
Pneumatic system model with friction phenomena for modern system control design

Abstract

The main contribution of this paper to develop a mathematical model which describes the movement of a piston of pneumatic cylinder controlled by a proportional valve, keeping the non linear behavior of pneumatic system. The Linear Parameter Varying (LPV) representations and Linear Matrix Inequality (LMI) based analysis and system control design are in the focus of modern control theories.