Browsing by Subject "identification"

Now showing 1 - 20 of 29

Access status: Restricted ,
Analiza jakości systemu regulacji ciśnienia gazu w stacji redukcyjnej
(Data obrony: 2019-01-28) Janczarski, Konrad
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Restricted ,
Automatyczna identyfikacja obiektów dynamicznych z wykorzystaniem programowalnych przyrządów pomiarowych
(Data obrony: 2018-01-22) Wilczek, Szymon
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Open Access ,
Control and identification algorithms for acoustic noise reduction
(Wydawnictwa AGH, 2007) Figwer, Jarosław; Czyż, Krzysztof; Główka, Teresa; Kasprzyk, Jerzy; Michalczyk, Małgorzata I.; Pawełczyk, Marek
The aim of the paper is to present main aspects of a research project on active noise reduction being performed at the Computer Control System Group, which is a part of the Institute of Automatic Control, Silesian University of Technology, Gliwice, Poland. In particular, the following problems are dealt with: higher order spectra in off-line and on-line identification of electro-acoustic plants for active noise reduction systems; creating distributed local zones of quiet in a reverberant enclosure using two structures: based on spatially distributed transducers controlled by a central unit or implemented as decentralized systems; development and analysis of optimal and adaptive feedback systems for generating zones of quiet at desired locations; enhancement of active noise reduction efficiency using nonuniform signal sampling and oversampling techniques; design and implementation of a portable multi-channel active noise control platform.
Access status: Restricted ,
Design and analysis of the axial and the radial active magnetic bearing
(Data obrony: 2017-09-15) Sikora, Bartłomiej
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Restricted ,
Eksperymentalna identyfikacja parametrów transmitancji mechanicznego układu oscylacyjnego
(Data obrony: 2019-01-22) Graba, Iwona
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Open Access ,
Identification of a backlash using the modelling function method
(Wydawnictwa AGH, 2005) Szmidt, Artur; Gierulski, Wacław
The physical value of a backlash in a kinematic pair of a mechanical system can be determined using a number of methods; still the problem is considered to be difficult. The identification may involve employing a modelling function, which allows also finding out about other properties of a given mechanical system. A modelling function constitutes a mathematical model for the relationship between the solids-joints interaction and the relative displacement and the relative velocity of the solids. This study aims at identifying a backlash by means of one-dimensional modelling functions that do not take account of velocity. The functions depend on the parameters determined during the identification process. Their values result from the similarity of signals being a response of the analysed real system and its mathematical model (i.e. its modelling function). The method does not require selecting signals; any signal representing the actual operation of the system will be applicable. Signals are analysed over a time period. A special form of the modelling function should permit determining the values of the searched parameters, i.e. the backlash.
Access status: Open Access ,
Identification of flexible structure model for piezoelectric vibration control
(Wydawnictwa AGH, 2005) Gosiewski, Zdzisław
Modern structures are light and compliance. Therefore, they are strongly influenced by external and internal perturbations. To reduce the structure vibrations the active vibration controls systems are designed. When active control of flexible structures is sought, three items must be individually and simultaneously considered. 1) The creation of reduced-order models. 2) Placement of sensors and actuators. 3) Countermeasures for spillover. All these problems are particularly important in the case of active system with parameter-distributed piezoelectric sensors and actuators. The glued piezoelectrics and their amplifiers change the structure parameters and should be taken into account in the model of the open-loop system. In the paper we consider an identification method which leads directly to the reduced-order model of the open-loop system. Analytical and experimental investigations were carried out for flexible beam with fixed one end and with opposite free end. Piezoelectric strips were glued on both sides of the beam: one works as a sensor and second one as an actuator. It means that we have designed single input single output system. It is appeared that used amplifier works as a low-pass filter which cuts-off the high-frequency dynamic effects. The frequency response function (FRF) was recorded and model of open-loop system was adjusted to experimental results. Taking into account the theory of reduced-order model of flexible structures we can state that resonances are connected with poles while anti-resonances with zeros of system transfer function. The resonance and anti-resonance frequencies were used directly in the model while damping coefficients were calculated by using of the least-square sum method. In the next step some control laws were used to damp the vibration of the beam. The proper control law was chosen with help of computer simulations. The active control loop rapidly accelerates the vanishing of the impulse-excited transient vibrations of the structure. Experimental results confirmed the analytical considerations.
Access status: Open Access ,
Identification of physical parameters of rigid rotor in magnetic bearings
(Wydawnictwa AGH, 2006) Gosiewski, Zdzisław; Górmiński, Marek
Identification of physical parameters of unstable system, as magnetic bearing is, is an important problem, for example in the design of its diagnostic system. Most of the identification methods are applied for stable systems, without requiring feedback terms for identification purpose. However, for identification of marginally stable or unstable systems, feedback control is required to ensure the overall system stability. In many cases, a system, although stable, may be operated in the closed-loop, and it is impossible to remove the existing feedback controller for security or for production reasons. In diagnostic systems, there are usually observed trends in changes of physical parameters (e.g., mass, resistance, inductance, and so on). The physical realization is one of the possible system realizations. For any dynamic system, although Markov system parameters are unique, the realized state-space model is not unique. If one needs to compare the identified state-space model with the analytical model, both models have to be in the same coordinates. An identification method of the state-space model resulting from the physics laws is presented in the paper. The method is a modification of the OKID method and it works exactly in the case when the sum of the input number and output number eguals to the dimension of the state vector. There is no always possibility to measure the state vector, so for identification, it is estimated by deadbeat state observer. On the base of the reconstructed model it is possible to extract ARX model of observer/controller. This model is used to obtain the physical state-space model of the open-loop system for voltage controlled magnetic bearings. As a plant we consider a rigid rotor supported by magnetic bearings. The described method in easy way let us to identify physical parameters (e.g., mass, resistance, inductance, and so on) of the plant, which could be used in diagnostic system.
Access status: Open Access ,
Identification of the servo motor used in the walking robot
(Wydawnictwa AGH, 2010) Piątek, Marcin
The paper describes the servo motor modelling and identification procedures. The hexapod - six-legged walking robot is presented. The Hitec servo motors are the robot actuators. The development environment where all experiments are performed is described in detail. The precise analysis of the servo motor static behaviour is done and the results are shown in numerical and graphical forms. An effort to identify the servo motor as a linear object has been taken. Finally, a non-linear model structure is assumed. The identification results are presented.
Access status: Open Access ,
Identifying key factors for successful development of agricultural biogas plants in Poland
(Wydawnictwa AGH, 2022) Ginda, Grzegorz; Szyba, Marta
In Poland, the potential for biogas production is high. It is an important source of renewable energy and contributes to reducing methane emissions (a greenhouse gas). In this article, the implementation of an agri-gas plant-construction program was evaluated in individual voivodeships based on materials from the National Agricultural Advisory Center (KOWR), the literature, and statistical data. Based on the collected data, it was concluded that the most meaningful factors for the successful development of Polish agricultural biogas plants were biogas-production technology, substrate availability, energy prices from renewable energy sources, waste-disposal costs, the population density in a commune, and the allocation of places in local spatial-development plans. The DEMATEL technique was used to identify the key developmental factors. The results of the study provide useful information for both governments and local authorities in their searches for effective ways to drive the sector’s development.
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Identyfikacja i tłumienie refleksów wielokrotnych w procesie przetwarzania danych sejsmicznych
(Data obrony: 2010-02-09) Budyn, Łukasz
Wydział Geologii, Geofizyki i Ochrony Środowiska
The subject of this master’s thesis is identification and suppression of multiples, typical form of coherent noise, usually present in seismic data. Identification of multiples is based on autocorrelation and retrocorrelation functions, in practice represented by sectional autocorrelogram and sectional retrocorrelogram. Suppression of multiples is achieved by two main groups of methods. First group contains filtering methods based on exploiting a difference between multiples and primaries, which is used to remove the multiples. This group contains such methods like: f-k filtering, Radon filtering and K-L filtering. Second group contains predictive methods based on prediction and subtraction of multiples from input data.
Access status: Restricted ,
Identyfikacja osób na podstawie analizy tęczówki
(Data obrony: 2009-12-16) Mokrzycki, Jacek
Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
Access status: Restricted ,
Identyfikacja parametrów silnika indukcyjnego klatkowego
(Data obrony: 2019-01-30) Moczyński, Michał
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Open Access ,
Identyfikacja pęknięcia belek na podstawie pomiarów amplitud drgań wymuszonych
(Wydawnictwa AGH, 2005) Majkut, Leszek
This paper deals with detection of the location and size of a transverse crack in beam like structure. An input quantity for identification a forced vibration amplitudes was chosen. For this quantity the inverse beam model was created. Identification algorithm based on this model was proposed.
Access status: Open Access ,
Identyfikacja pęknięcia w belkach na podstawie pomiaru częstości drgań własnych
(Wydawnictwa AGH, 2005) Majkut, Leszek
This paper deals with detection of the location and size of a crack. An input quantity for identification a natural frequencies was chosen. For this quantity the inverse beam model was created. Computer algorithm for making identification based on this model was proposed.
Access status: Open Access ,
Identyfikacja tłumienia w gruncie
(2008) Wrana, Bogumił; Czado, Bartłomiej
The first part of this paper describes a typical procedure of determining damping coefficients of a construction, using modal method. A short analysis of application of this method to soil is discussed. In the main part a procedure of determinig the damping of soil using half-power bandwidth method and wavelet transformation is described. Some basic andvantages of this method referring to modal method were shown. Final part of the paper contains a numerical example of application of the described method.
Access status: Open Access ,
Laboratorium Robotyki, Fotowoltaiki i Lewitacji Magnetycznej – historia i tematyka badawcza
(Wydawnictwa AGH, 2023) Piłat, Adam Krzysztof; Więckowski, Łukasz; Teneta, Janusz; Garbacz, Maciej; Kreft, Wojciech; Sikora, Bartłomiej Marian; Milanowski, Hubert; Bieszczad, Rafał; Janczarski, Konrad
Praca przedstawia zagadnienia naukowo-badawcze realizowane w zespole Robotyki, Fotowoltaiki i Lewitacji Magnetycznej Katedry Automatyki i Robotyki AGH. Opracowywane koncepcje i projekty stanowią nowe rozwiązania z zakresu automatyki, robotyki i technologii lewitacji. Prowadzone badania są istotne z uwagi na aktualny wzrost liczby wdrożeń tych technologii spowodowany optymalizacją ich efektywności, diagnostyki i sposobu sterowania.
Access status: Open Access ,
Modelling of the semi-active suspension system
(2011) Gorczyca, Przemysław; Rosół, Maciej
The paper is concerned with a mathematical model of the Semi-Active Suspension system (SAS) of a vehicle equipped with the magnetorheological rotary brake manufactured by the Lord Corporation. SAS is a laboratory system animating the suspension action of a car quarter. A simulation model written in the MATLAB/Simulink environment is shown. The parameters of the mathematical model are identified by optimization procedures based on experimental data collected in the real-time. The mathematical model is verified. It means that appropriate system trajectories of SAS and the simulation model are compared.
Access status: Open Access ,
Operating point shift induced by relay asymmetry: an iterative solution proposal
(2023) Pekař, Libor; Matušů, Radek; Guzowski, Hubert; Gazdoš, František
Wydział Informatyki
This contribution focuses on a problem that appears when using a relay with non-symmetric output in the closed loop. Such a scheme is usually used for process model parameters identification, possibly followed by automatic controller tuning. Whenever static or dynamic properties of the process reveal asymmetry when the sign of the input changes, the setpoint (reference) becomes different from the operating point value of the process output. As a class of relay-based identification methods utilize calculations in the frequency domain that are based on integral computation around the operating point, the discrepancy between the setpoint and the operating point can lead to incorrect results. The aim of the paper is mainly to provide the reader with problem formulation and step-by-step proposition of how it can be solved. Concise numerical examples are also given. The concluding remarks suggest possible further ways of research.
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Pomiarowo-obliczeniowe wyznaczanie parametrów modelu maszyny indukcyjnej klatkowej
(Data obrony: 2017-10-18) Małysa, Mariusz
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej