2014 - Repozytorium publikacji - Politechnika Gdańska

Pokaż publikacje z roku

Publikacje z roku 2014

Pokaż wszystkie

Model-Free Controller Tuning Based on DFT Processing: Application to Induction Motor Drives
- Mohamed Amine Fnaiech
- Sofiane Khadraoui
- Hazem N. Nounou
- Mohamed N. Nounou
- Jarosław Guziński
- Haitham Abu-Rub
2014 IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
In this paper, we present a new approach based on discrete Fourier transform (DFT) analysis for controller tuning of the closed-loop system with unknown plant. The DFT analysis is used to process the closed-loop measurements collected online to derive the frequency response of an initial closed-loop system that does not provide a good performance. Based on the closed-loop frequency response data, we propose two methods for tuning PID controller parameters according to some desired closedloop performance specifications. The proposed approach can be applied online because the closed-loop system does not need to be stopped for data collection. The tuning problem of rotor speed controllers of electric drives, is chosen as an example to experimentally validate our proposed method. Specifically, we are interested here in the control of an induction motor. The availability of high-performance computational and storage facilities greatly simplifies the collection of measured data used for controller tuning. The experimental results presented in this paper demonstrate the efficacy and usefulness of the proposed control design method in many industrial applications.
Modeling of Ice Phenomena in the Mouth of the Vistula River
- Tomasz Kolerski
2014 Pełny tekst Acta Geophysica
The mouth of the Vistula River, which is a river outlet located in tideless area, is analyzed. The Vistula River mouth is a man-made, artificial channel which was built in the 19th century in order to prevent the formation of ice jams in the natural river delta. Since the artificial river outlet was constructed, no severe ice-related flood risk situations have ever occurred. However, periodic ice-related phenomena still have an impact on the river operation. In the paper, ice processes in the natural river delta are presented first to refer to the historical jams observed in the Vistula delta. Next, the calibrated mathematical model was applied to perform a series of simulations in the Vistula River mouth for winter storm condition to determine the effects of ice on the water level in the Vistula River and ice jam potential of the river outlet.
Modeling of subarachnoid space width change caused by blood circulation in brain vessels
- Kamila Mazur
- Renata Kalicka
2014
The subarachnoid space is an anatomic space, lying in the central nervous system, between the arachnoid membrane and the pia mater. It is filled with cerebrospinal fluid, which protects and nourishes the brain. The pathological disorder of the subarachnoid space (i.e. increase or decrease of its width) a ects the nervous system. Therefore, it is important to diagnose the width changes of the subarachnoid space. One way to support the diagnostics of subarachnoid space is to model proper and improper work of human body. This article presents a model describing the width changes of the natural subarachnoid space due to blood flow velocity (heartbeat).
Modeling of truss with cold-formed section and positive eccentricity in the node
- Małgorzata Gordziej-Zagórowska
- Elżbieta Urbańska-Galewska
- Robert Jankowski
2014 Pełny tekst Structure and Environment
This work is dedicated to establishing the load carrying capacity of tensed and compressed truss’ nodes made of cold-formed open cross sections. The occurrence of bending in the truss’ nodes is the result of a specific production technology for system lattice girders assumed by the designer and the producer. The aim of this research is to present the methodology of conduct for creation of computational models that best depict the behaviour of truss members welded from cold-formed sections with positive eccentricities in the node. Gradual introduction of more complex computational analysis methods allowed for following, how the assumed method influenced the results and facilitated their analysis and estimation.
Modelling a 6-dof manipulator using Matlab software
- Adam Barylski
- Norbert Piotrowski
2014 Archiwum Technologii Maszyn i Automatyzacji
This paper presents an alternative approach to modelling a revolute robot. The manipulator in question is Kuka KR 16-2. The main problem in robot modelling is a kinematic analysis. The revolute robot consist of six rotary joints (6-DOF) with base, shoulder, elbow and wirst. The kinematics problem is defined as a transformation from the cartesian space to the joint space. The Denavit- Hartenberg (D-H) model of representation was used to model links and joints in this study. Both forward and inverse kinematics solutions for this manipulator were presented. The kinematic equations presented have been implemented in Matlab software. The graphical model of Kuka KR 16-2 was shown and possibilities of modelling in Matlab were described.
Modelling an accelerometer for robot position estimation
- Zdzisław Kowalczuk
- Tomasz Merta
2014 Pełny tekst
The article describes a new model of a MEMS accelerometer for usage in inertial measurement units (IMU). Such units allow to measure orientation and location of the sensor/system and therefore can be applied for systems positioning. The main purpose of the paper is to model pertinent accelerometer functions substantial in determination of the location of the sensor by means of double integration of acceleration. The model takes into account static and dynamic working conditions. Based on this model an estimator is constructed that allows us to test the developed system in terms of the effects of rotational dynamics. Computer simulations are applied to illustrate the performance of the estimator for simulated measurement signals. The results obtained show what conditions must be met in order to properly determine the linear acceleration with accelerometer measurements
Modelling and computer animation of geodetic field work
- Beata Wieczorek
- Anna Sobieraj-Żłobińska
- Katarzyna Pająk
2014
3D modelling of objects is a way of obtaining information, while the visualization of geospatial data is becoming a production task in the scope of surveying. Visualization of geospatial data provides effective tools for analysis information about the land surface, land cover, its features, properties etc. Computer animations, both 2D images and 3D are becoming additional, expected and clear form for presentation results of geodetic field work. The most frequently presented part of reality in the 3D is terrain relief displayed as Digital Terrain Model - DTM. DTM is now an essential product to start many investment processes. The second most commonly mapped geographical components in 3D are buildings. Terrain modelling is becoming increasingly important, both in scientific and commercial applications. The third dimension of the map enables to recreate reality. Developing relief, buildings and other features is possible because of new technologies like LIDAR or RTK. Terrain modeling is becoming increasingly important, both in scientific and commercial applications. Using GIS tools enables to conduct studies on geomorphological aspect of landform research, creating cut-edge visualization and many more. The third dimension of the map facilitates intuitive 3D perception, interaction and collaboration with geospatial data. Observer gets an impression of viewing reality. The use of 3D technology allows for the transition from the flat paper map to the virtual map and build three-dimensional models.
Modelling gene expression of a self-regulating protein
- Agnieszka Bartłomiejczyk
- Marek Bodnar
2014
We analyze a model of gene transcription and protein synthesis. We take into account the number of sites on the protein’s promoter at which the protein’s dimers can bind blocking transcription of protein mRNA.
Modelling Object Behaviour in a Video Surveillnace System Using Pawlak's Flowgraph
- Karol Lisowski
- Andrzej Czyżewski
2014
In this paper, methodology of acquisition and processing of video streams for the purpose of modelling object behaviour is presented. Multilevel contextual video processing was also mentioned. The Pawlak’s flowgraph is used as a container for the knowledge related to the behaviour of objects in the area supervised by a video surveillance system. Spatio-temporal dependencies in transitions between cameras can be easily changed in real-life situations. In order to cope with such fluctuating conditions, an adaptive algorithm is implemented. Consequently, as it was shown the flowgraph reacts faster to the occurring changes.
Modelling of Curvature of the Railway Track Geometrical Layout Using Particle Swarm Optimization
- Katarzyna Palikowska
2014 Logistics and Transport
A method of railway track geometrical layout design, based on application of cubic C-Bezier curves for describing the layout curvature is presented in the article. The control points of a cubic C-Bezier curve are obtained in an optimization process carried out using Particle Swarm Optimization algorithm. The optimization criteria are based on the evaluation of the dynamic interactions and satisfaction of geometrical design requirements.
Modelling of FloodWave Propagation with Wet-dry Front by One-dimensional Diffusive Wave Equation
- Dariusz Gąsiorowski
2014 Pełny tekst Archives of Hydro-Engineering and Environmental Mechanics
A full dynamic model in the form of the shallow water equations (SWE) is often useful for reproducing the unsteady flow in open channels, as well as over a floodplain. However, most of the numerical algorithms applied to the solution of the SWE fail when flood wave propagation over an initially dry area is simulated. The main problems are related to the very small or negative values of water depths occurring in the vicinity of a moving wet-dry front, which lead to instability in numerical solutions. To overcome these difficulties, a simplified model in the form of a non-linear diffusive wave equation (DWE) can be used. The diffusive wave approach requires numerical algorithms that are much simpler, and consequently, the computational process is more effective than in the case of the SWE. In this paper, the numerical solution of the one-dimensional DWE based on the modified finite element method is verified in terms of accuracy. The resulting solutions of the DWE are compared with the corresponding benchmark solution of the one-dimensional SWE obtained by means of the finite volume methods. The results of numerical experiments show that the algorithm applied is capable of reproducing the reference solution with satisfactory accuracy even for a rapidly varied wave over a dry bottom.
Modelling of network schedule including priority of selected technical resources
- Anna Jakubczyk-Gałczyńska
2014 Pełny tekst Czasopismo Techniczne
The paper presents a method of network planning CPM – Critical Path Method. The author compares models of optimal solutions to design deadlines for individual works, taking various leading technical resources such as is labor and a tower crane into account.
Modelling of Nuclear Power Plant Steam Turbine
- Anna Kobylarz
- Karol Kulkowski
- Michał Grochowski
- Kazimierz Duzinkiewicz
2014
The paper describes the approach to a Nuclear Power Plant steam turbine modelling which would enable on-line optimal process control (model based) and diagnosis over wide range of operating conditions caused by changing power demand. Presented model is static, multivariable and nonlinear. Such model enables analyzing the heat cogeneration aspects. Developed model is validated and verified by using archive data gained from researches within previous Polish Nuclear Power Programme. Paper concerns the WWR 440 steam turbine that was supposed to be used in Zarnowiec. The model is also tested by using varying inputs. In the final section the ideas regarding the future development of this model are presented.
Modelling of Nuclear Power Plant Steam Turbine
- Anna Kobylarz
- Karol Kulkowski
- Kazimierz Duzinkiewicz
- Michał Grochowski
2014
The paper describes the approach to a Nuclear Power Plant steam turbine modelling which would enable on-line optimal process control (model based) and diagnosis over wide range of operating conditions caused by changing power demand. Presented model is static, multivariable and nonlinear. Such model enables analyzing the heat cogeneration aspects. Developed model is validated and verified by using archive data gained from researches within previous Polish Nuclear Power Programme. Paper concerns the WWR 440 steam turbine that was supposed to be used in Zarnowiec. The model is also tested by using varying inputs. In the final section the ideas regarding the future development of this model are presented.
Modelling of some stealth features for a small navy ship at the concept design stage.
- Mirosław Gerigk
- Natalia Szulist
2014 Logistics and Transport
In this paper the basic research problems associated with modelling the basic stealth features for a small navy ship at the concept design stage are introduced. Amongst the major stealth features considered are: the modification of the immersed ship hull form by a rapid change of the ship loading condition, and modification of the ship boundary layer by the hull skin cover. The other stealth features of the ship are not presented in this paper as they do not refer to the ship hydromechanics. The research method is based on the navy ship risk assessment and assessment of the ship performance. The risk may be estimated according to a proposed risk model. The risk assessment may be done according to the risk matrix criteria. The ship performance assessment is based on modification of the immersed ship hull form and modification of the ship boundary layer. Some elements of the research method and mathematical model for estimating the ship performance are introduced in the paper. In general, the research is associated with the interdisciplinary investigations and multi-criteria ship design. The problems presented in the paper follow the Ph.D. research conducted at the Faculty of Ocean Engineering and Ship Technology at Gdańsk University of Technology.
Modelling of some stealth features for a small navy ship at the concept design stage - part II
- Natalia Szulist
2014 Pełny tekst Journal of Polish CIMEEAC
In the paper a few problems associated with modelling the basic stealth features for a small ship at the concept design stage are introduced. One problem concerns the modification of the immersed ship hull using the rapid change of the ship loading condition. The second is associated with the modification of the ship boundary layer by the hull skin cover. The other stealth features of the ship are not presented in this paper. The research method is based on the risk assessment and assessment of the ship performance. The risk may be estimated according to a proposed risk model. The risk assessment can be done according to the risk matrix criteria. The ship performance assessment is based on modification of the ship hull position on the water surface and modification of the ship boundary layer. Some elements of the research method and mathematical model for estimating the ship performance are introduced in the paper. Generally, the research is associated with the interdisciplinary investigations and multi-criteria ship design. The problems presented in the paper follow from the a Ph.D. research conducted at the Faculty of Ocean Engineering and Ship Technology Gdańsk University of Technology.
MODELLING OF TOXIC COMPOUNDS EMISSION IN MARINE DIESEL ENGINE DURING TRANSIENT STATES AT VARIABLE PRESSURE OF FUEL INJECTION
- Ryszard Zadrąg
- Marek Zellma
2014 Pełny tekst Journal of Polish CIMEEAC
Transient states are an important part of the spectrum of engine loads, especially the traction engines. In the case of marine diesel engines, transient states are of particular importance in reducing the analysis of motion units for special areas and maneuvering in port, the participation of transient states in the load spectrum significantly increases, also, the emission of toxic compounds from this period increases proportionally. The factors which determine the value of the emission are the forces shaping transient states and the technical condition of the engine itself. To describe the transient states, authors propose the use of multi-equation models, the presented material focuses on the analysis of changes in toxic compound concentrations during transients at varying pressures of the injector opening, which is a typical regulatory parameter that undergoes relatively frequent changes in the process of using the engine. This paper presents a description of transient states using multi-equation models, and the analysis of their relevance. It also presents a comparison of toxic compounds concentration at modified angles of fuel injection advance.
MODELOWANIE ANALITYCZNE I NUMERYCZNE PRZEPŁYWU PRZEZ WIEŃCE TURBINOWE PODDŹWIĘKOWE
- Anna Butterweck
- Jerzy Świrydczuk
2014
Niniejszy rozdział zawiera krytyczny przegląd najbardziej typowych konstrukcji wieńców kierowniczych stosowanych w turbinach energetycznych pracujących w polskich elektrowniach i elektrociepłowniach. Przedstawiono charakterystyczne dane geometrii stopni oraz dokonano analizy przepływu przez wybrane reprezentatywne stopnie pracujące w warunkach nominalnych. W analizie wzięto pod uwagę m.in. zakresy prędkości rejestrowane w tych wieńcach oraz przebiegi zmian parametrów przepływowych w kanale kierowniczymi. Analiza nakierowana jest na wybór konstrukcji wieńca do wykorzystania w obliczeniach optymalizacyjnych prowadzonych z wykorzystaniem sieci neuronowych. W ocenie wzięto pod uwagę powszechność występowania poszczególnych typów łopatek i związane z tym możliwości pozyskiwania danych referencyjnych w postaci zarówno wyników analiz teoretyczno-numerycznych, jak i wartości pomierzonych w turbinach w rzeczywistych warunkach ich eksploatacji. Wzięto również pod uwagę skalę złożoności samej konstrukcji wieńca kierowniczego jak i rozkładów parametrów przepływowych – ich zakresu i regularności – w kanałach kierowniczych i na powierzchniach łopatek.
MODELOWANIE ANALITYCZNE I NUMERYCZNE PRZEPŁYWU PRZEZ WIEŃCE TURBINOWE PRZYDŹWIĘKOWE I NADDŹWIĘKOWE
- Anna Milewska
- Mariusz Szymaniak
2014
W rozdziale dokonano przeglądu charakterystyk przepływowych dwóch najbardziej typowych konstrukcji wieńców kierowniczych stosowanych w turbinach energetycznych pracujących w konwencjonalnych elektrowniach parowych. Przywołano charakterystyczne dane geometrii stopni oraz dokonano analizy przepływu przez wybrane reprezentatywne stopnie pracujące w warunkach nominalnych. W analizie wzięto pod uwagę m.in. zakresy prędkości rejestrowane w tych wieńcach oraz przebiegi zmian parametrów przepływowych w kanałach kierowniczych. Analiza nakierowana jest na wybór konstrukcji wieńca kierowniczego z skośną falą uderzeniową do wykorzystania w obliczeniach prowadzonych z wykorzystaniem sieci neuronowych. W ocenie wzięto pod uwagę powszechność występowania poszczególnych typów łopatek i związane z tym możliwości pozyskiwania danych referencyjnych w postaci zarówno wyników analiz teoretyczno-numerycznych, jak i wartości pomierzonych w turbinach w rzeczywistych warunkach ich eksploatacji.
Modelowanie budynków wielofunkcyjnych stanowiących elementy systemu logistycznego miasta
- Mateusz Gerigk
2014 Logistyka
W tekście omówiono problematykę projektowania budynków wielofunkcyjnych stanowiących elementy miejskiego systemu logistycznego. W artykule przedstawiona została metodologia dotycząca projektowych aspektów modelowania obiektów wielofunkcyjnych, które wymagają od architektów podejścia wielokryterialnego w projektowaniu. Ponadto, biorąc pod uwagę dynamiczne funkcjonowanie oraz intensywny rozwój ośrodków miejskich w pracy przedstawiona została metoda holistyczna w projektowaniu obiektów wielofunkcyjnych.