Wyniki wyszukiwania - BazTech

1

Assessment of the influence of the bending form shape on the stress and plastic strain values in a cold bending pipe

Nozdrzykowski Krzysztof, Stępień Mateusz, Grządziel Zenon

Zeszyty Naukowe Politechniki Morskiej w Szczecinie

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2024

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nr 78 (150)

35--48

EN

Abstract This paper presents the results of modelling research concerned with the technological process of the cold bending of a pipe. Stress and plastic strain studies are carried out using the finite element method (FEM) on a thick-walled pipe and various shapes of bending form. The results of the research are benchmarked in terms of the correctness of the implementation of the bending process, including the change in the pipe outside diameter and wall thickness. The level of ovalisation of the cross-section in the bending pipe is used as the primary criterion for assessing the correctness of the bending process. The results show that the most favourable properties in terms of minimising the ovalisation of the pipe cross-section are provided by the use of a bending form with a trapezoidal shape.

2

Lung divisions for models of cardiopulmonary interaction – preliminary tests

Pałko Krzysztof J., Kołodziej Dariusz, Darowski Marek

Polish Journal of Medical Physics and Engineering

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2024

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Vol. 30, Iss. 2

52--68

EN

Introduction: The perfusion of a part of the lung depends on its distance from the pulmonary trunk (differences in vascular resistance) and on the horizontal plane (differences in hydrostatic pressure). The aim of this study was to determine the geometric parameters characterising their positions and sizes in order to analyse the diffusion of the ventilation/perfusion ratio. Material and methods: A developed virtual respiratory system has been supplemented with an appropriate model of pulmonary circulation that uses a lung outline that is divided into parts based on an anatomical atlas and a CT image; it comprises a 3D geometric model of the lungs that was developed using the Inventor CAD software (Autodesk, Inc, San Francisco, USA). Each panel was divided into 2 horizontal and 8 vertical parts; the 16-part division was then modified. Results: When taking human lungs as a research object and simulating their accompanying physical, biological, or biochemical phenomena, one necessary task is to construct a spatial model of the lungs that takes into account, and maintains awareness of, the limitations of the source of data that is relied upon. The developed modified geometric model of lung division turned out to be useful and was successfully applied to a virtual patient, among others, as part of the VirRespir project. Conclusions: Finally, we can conclude that the virtual cardiorespiratory system thus elaborated may serve as a proper tool for the preliminary analysis of such complex interactions, considering the elaborated model of the lung’s divisions and its future improvements.

3

Modeling of Dispersed Red 17 Dye Removal from an Aqueous Solution Using Artificial Neural Network

Ibrahim Abdullah I., Asmel Nabel K., Alabdraba Waleed M. S., Al-Nima Raid R. O.

Journal of Ecological Engineering

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2024

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Vol. 25, nr 2

10--19

EN

A significant amount of hazardous compounds has leaked into the environment due to the widespread usage of organic dyes, and it is essential that these dangerous contaminants be removed in a sustainable way. This study used varying amounts of H2O2 (0, 0.5, 1.5, 3, and 5) mM/L to extract the dye from the aqueous solution. Furthermore, concentrations of 0.4, 1, 1.7, and 2.3 mM/L of Fe+2 as FeSO4•7H2O were also utilized. Batch Advanced Oxidation Process (AOP) was carried out under various working conditions, including: contact time (5–60 min), mixing speed (100–300 rpm), and UV light intensity (0–40 W). Utilizing experimental data, the AOP efficiency of Dispersed Red 17 Dye was calculated. Genetic Cascade-forward Neural Network (GCNN) was employed as a machine-learning tool to forecast the oxidation efficiency and the amount of dye that would be removed from the aqueous solution, specifically Dispersed Red 17. When compared to experimental data, the best model had an R2 correlation value of 0.955. The findings of the importance analysis showed that the studied parameters affected the discoloration efficiency with order of: H2O2, UV, Fe+2, mixing speed, and contact time. The obtained results demonstrated the effectiveness of GCNN as a novel approach in forecasting the AOP efficiency of Dispersed Red 17 Dye.

4

Dependability model of automated intelligent regenerative life support system for space missions

Kabashkin Igor, Glukhikh Sergey

International Journal of Electronics and Telecommunications

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2024

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Vol. 70, No. 1

39--44

EN

Long-duration human space missions require intelligent regenerative life support systems that can recycle resources and automatically manage failures. This paper explores using Petri nets to model the reliability and complex interactions of such closed-loop systems. An architecture consisting of primary systems, backups, and consumable reserves is outlined. The automation system that controls everything is described. Petri nets can capture concurrency, failure modes, redundancy, and dynamic behavior. A modular modeling methodology is presented to develop hierarchical Petri net models that scale in fidelity. Elementary fragments represent failures and redundancy. Subsystem modules can be substituted for more detailed models. Analysis and simulation assess system reliability and failure response. This supports designing ultra-reliable systems to safely sustain human life in space.

5

Wybrane czynniki wpływające na dokładność modelowania indukcyjnych układów grzejnych

Wesołowski Marcin, Czerwiński Michał

Elektronika : konstrukcje, technologie, zastosowania

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2024

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Vol. 65, Nr 1

24--31

PL

Modelowanie nagrzewania indukcyjnego w celu konstrukcji urządzeń jest procesem wymagającym analiz sprzężonych, co najmniej elektromagnetyczno-cieplnych i może być realizowane przy wykorzystaniu modeli polowych i obwodowych. Są to zagadnienia rozbudowane, obejmujące szeroką wiedzę z dziedziny elektrotechniki, elektroniki i termodynamiki. Istotą prowadzonych analiz jest uzyskiwanie rezultatów o wysokiej dokładności w warunkach konieczności stosowania szeregu uproszczeń. W niniejszej pracy scharakteryzowano kilka istotnych czynników wpływających na dokładność numerycznych analiz procesu nagrzewania indukcyjnego, z uwzględnieniem wpływu przyjmowanych uproszczeń w analizie zagadnień cieplnych i rodzaju sprzężenia, będących podstawowymi czynnikami, rzadko uwzględnianymi w obliczeniach tej klasy. Celem pracy jest usystematyzowanie współczesnego stanu wiedzy w zakresie prowadzenia inżynierskich procedur obliczeniowych w zagadnieniach nagrzewania indukcyjnego.

EN

Modeling of induction heating to design physical devices is a process that requires coupled analyses, at least electromagnetic and thermal and can be implemented using field and circuit models. These are extensive issues, covering knowledge in the field of electrical engineering, electronics and thermodynamics. The essence of the analyzes is to obtain high-accuracy results. This paper characterizes several important factors affecting the accuracy of numerical analyzes of the induction heating process, taking into account the impact of the adopted simplifications in the analysis of thermal issues and the type of coupling, which are basic factors rarely taken into account in similar calculations. The aim of the work is to revise the current state of knowledge in the field of engineering computational procedures of induction heating systems.

6

Drying Kinetic Behavior of Dried Salam Leaves (Syzygium polyanthum) Based on Forced Convective Solar Drying and Open Sun Drying

Mardiyani Siti Asmaniyah

Ecological Engineering & Environmental Technology

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2024

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Vol. 25, iss. 2

190--198

EN

Salam leaves, a traditional food flavoring spice, are a widely recognized herb in Indonesia and are used in many regions. This study aimed to investigate the drying kinetics of salam leaves, comprising mathematical modeling, moisture diffusivity, and other nutritional values as qualitative parameters. The drying process was examined using a forced convective system (CSD) and open sun drying (OSD). The drying behavior was examined by observing the drying kinetics characteristics using 12 thin-layer semi-theoretical mathematical for drying of agricultural products, determining the moisture diffusivity, as well as measuring the content of chlorophyll a, b, and total dissolved solids as nutritional quality indicators of the drying products. According to the obtained results from the non-linear regression analysis, the Midilli model demonstrates the highest degree of appropriateness for drying salam leaves. The moisture diffusivity of CSD is greater than that of open-air solar drying. Regarding nutritional composition, the study revealed that chlorophyll a, b, and carotenoid levels in the dried leaves obtained through CSD were more significant than those obtained by OSD. As an environmentally friendly dryer, CSD can potentially be applied in herb-drying industries, especially salam leaves.

7

Modelling and simulation studies on the characteristic behaviour of macroalgae derived bio-oil

Thirumalaikumar Ramaiah, Jaikumar Vasudevan

Ecological Chemistry and Engineering. S

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2024

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Vol. 31, nr 1

19--30

EN

With the expanding need for renewable and sustainable energy resources, the demand for biomass derived bio-oil particularly microalgae or macroalgae based bio-oil is growing. In this regard, understanding the characteristics of bio-oil as a function of several influencing operational parameters is essential. In this study modelling and simulation technique based on Aspen HYSYS was applied to investigate the characteristics of macroalgae Ulva prolifera derived bio-oil from Hydrothermal Liquefaction (HTL) process as a function of the influencing parameters like temperature, kinematic viscosity, and weight percent of the bio-oil assay, cut yield behaviour, and standard liquid density. Modelling and simulation help to optimise the process parameters and design the process layout for large-scale production. According to the simulation results the cut yield of off gases, light naphtha, heavy naphtha, light distillate, heavy distillate, gas oil and residues are shown at specific final boiling point (FBP) temperatures of 70 °C, 70 °C - 110 °C, 110 °C - 221.1 °C, 221.1 °C - 304.4 °C, 304.4 °C - 371.1 °C, 371.1 °C - 537.8 °C and 537.7 °C respectively. Whereas, above a temperature of 300 °C, the weight percentage of aromatic components increased steadily. The increase in percentage composition of the aromatic components is due to the reduction of the paraffinic components. The density of the liquid bio-oil was steadily increasing until a temperature of 200 °C.

8

Analysis of the general index of modelling in interior lighting

Pracki Piotr, Komorzycka Paulina

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2024

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Vol. 72, nr 3

art. no. e149233

EN

Directionality of light and modelling effects impact lighting quality in interiors. Modelling effects depend on the photometric characteristics of luminaires and their layout but also interior size and reflectance. This research aims to evaluate lighting design limitations and the characteristics of the impact of interior and luminaires on modelling effects, as well as elaborate a prediction method of modelling effects in interior lighting. The general index of modelling was used for the analysis of modelling effects in interiors. The implementation of the research objectives was based on simulation and statistical analysis. 432 situations, varied interior size, and reflectance, the lighting class, luminaire downward luminous intensity distribution, and layout were considered. The results show that achieving the required range of the general index of modelling in interior lighting is substantially limited. The general index of modelling is impacted the most by the layout of luminaires. The elaborated multiple linear regression models can have a practical use for interior lighting design and analysis in terms of obtaining the required range of the general index of modelling.

9

Design of a novel control scheme for the operation of the doubly fed induction generator

Kumar Ram Krishan, Choudhary Jayanti

Archives of Electrical Engineering

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2024

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Vol. 73, nr 2

373--392

EN

The advancement of ocean renewable energy through Tidal Stream Turbines (TSTs) necessitates the use of a variety of computer models to properly evaluate TST efficiency. The Doubly Fed Induction Generator (DFIG) is the most widely utilized Wind Turbine (WT) in the expanding global wind sector. Grid-tied wind energy systems often use the DFIG to meet conventional grid needs including power quality enhancement, grid stability, grid synchronization, power regulation, and fault ride-through. This paper demonstrates the design of a novel control scheme for the operation of the DFIG. The suggested control scheme consisted of an Improved Recurrent Fuzzy Neural Network (IRFNN) and Ant Colony Optimization with Genetic Algorithms (GACOs). A global control system is created and executed to monitor the changeover between the two operating modes. The plant enters a variable speed mode when the tidal speed is low enough, where the system is controlled to ensure that the turbo-generator module functions at peak power extraction efficiency for any specific tidal velocity. The findings demonstrate the system’s superior efficiency, with the highest power extraction provided despite variations in tidal stream input.

10

Surface Roughness Prediction in the Hardened Steel Ball-End Milling by Using the Artificial Neural Networks and Taguchi Method

Matras Andrzej

Advances in Science and Technology. Research Journal

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2024

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Vol. 18, no 1

184--194

EN

The paper provides an analysis of the impact of the values of cutting tool inclination strategies and angles measured in the parallel and perpendicular to feed direction, radial depth of cut and feedrate on the surface roughness. The workpiece was made of the AISI H13 steel, hardness 50 HRC, and was machined using a ball-nosed end mill with CBN edges. The research methodology involved experiments conducted based on the Taguchi orthogonal array, optimization of parameters with the use of Taguchi method and process modelling using neural networks. Thanks to the use of neural networks, the analyses were performed for various levels of machining efficiency, obtained as a result of different radial depths of cut and feedrates. In order to obtain mathematical models well-describing strongly nonlinear impact of the cutting tool inclination strategies and angles, a separate neural network learned for each tool inclination strategy. The prediction of results was made using a set of neural networks. The analyses and experiments resulted in surfaces with very low Ra parameter of 0.16 μm and mathematical models with a good fit to the experimental data. Values of the cutting tool inclination angle that allow obtaining the surface of specific surface roughness were specified for various levels of machining performance.

11

Investigating Vibration Transmission in Cargo Containers During Heavy-Duty Off-Road Transport

Vilau Radu, Voicu Daniela, Stoica Ramona-Monica, Ciobotaru Ticusor, Rykała Magdalena, Rykała Łukasz

Advances in Science and Technology. Research Journal

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2024

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Vol. 18, no 4

312--328

EN

This article focuses on the investigation and analysis of vibrations transmitted to cargo during off-road transportation, with particular emphasis on the impact of vehicle and road surface interactions. The primary objective of the research is to quantify and characterize the amplitudes of vibrations generated by the interaction between heavy-duty truck tires and rough terrain, and their subsequent transmission to cargo containers. To achieve this, a virtual model of a tactical transportation truck was created using TruckSim software. Two characteristic off-road tracks were simulated, based on driving conditions typically experienced by heavy-duty vehicles in demanding logistical scenarios. The experimental validation of the virtual model was conducted using a heavy-duty truck outfitted with a 20 ft (6096 mm) cargo container. The results of the work include recorded acceleration data, suspension behavior, and the maximum driving speed at which the vehicle remained stable on both tracks. Moreover, the work is a direct response to the needs of the automotive industry and the military.

12

Ochrona odgromowa stacji transformatorowej dla pływającej elektrowni fotowoltaicznej

Sobolewski Konrad

Wiadomości Elektrotechniczne

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2023

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R. 91, nr 11

16--22

PL

Artykuł poświęcono ogólnej charakterystyce ochrony odgromowej pływającej elektrowni fotowoltaicznej wraz ze stacją transformatorową. Przedstawione zostało zagrożenie piorunowe dla poszczególnych struktur obiektu, a następnie dokonano analizy możliwych do zastosowania wariantów ochrony przed działaniem pioruna. Odniesiono się zarówno do: zwodów, przewodów odprowadzających, jak i systemu uziemiającego. Temu ostatniemu, jako elementowi najbardziej różnicującemu sposób wykonania pływającej elektrowni, poświęcono dodatkową analizę modelowo-symulacyjną obejmującą różne sposoby wykonania oraz wpływ zmian środowiskowych na skuteczność jego działania. Całość zamyka podsumowanie oraz wnioski.

EN

This article is devoted to the general characteristics of lightning protection of a floating photovoltaic power plant with a transformer station. The lightning hazard for individual structures of the facility was presented, and then the possible variants of lightning protection were analysed. Reference was made to the air terminals, the discharge wires and the grounding system. The last one was the subject of an additional model and simulation analysis covering various forms of execution and the impact of environmental changes on the effectiveness of its operation as the element that provides the most differentiation of a floating power plant construction method. The paper ends with a summary and conclusions.

13

Solid Rocket Boosters Separation System Development for the ILR-33 Amber 2K Rocket

Kierski Jan, Pazik Arthur, Cieśliński Dawid

Transactions on Aerospace Research

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2023

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Nr 3 (272)

16--27

EN

The paper presents the development process of the solid rocket boosters (SRBs) separation system of the ILR-33 AMBER 2K rocket. A redesign of the system was required due to the development of new, larger SRBs. The main system requirements were transmission of forces and moments between the SRBs and the main stage, execution of the separation process at a given moment in flight and mechanical integration simplification. A set of aerodynamics calculations were performed. With the use of computational fluid dynamics software, forces acting on the booster during separation for several angles of attack, as well as the critical booster deflection angle, have been determined. Next, a mathematical model was created to define the load spectrum acting on the system during the flight and separation phases, covering both static and dynamic loads. All the internal and external force sources were considered. A series of motion dynamics simulations were conducted for representative flight cases. Then, the system operational parameters were verified with the use of dedicated ground test facilities. Necessary calibrations of the mathematical model were then implemented, leading to a high level of confidence with the empirical data obtained, thereby leading to a successful system qualification for the flight campaign.

14

Modelling in the identification of threats to the functioning of technical system

Żółtowski Bogdan, Żółtowski Mariusz, Castañeda Lionel F.

Systemy Logistyczne Wojsk

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2023

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Vol. 58, no. 1

5--24

EN

Modern technical systems used in practice (machines, vehicles, military technology) are subject to automatic degradation of the technical condition, which forces modelling to identify changes in this state. The available modelling methods in identifying changes in the technical condition of such systems make it possible to supervise the developing threats to the correctness of their functioning. The aim of the work was to present available methods and tools for modeling and identifying evolving threats to complex technical systems in terms of description and indication of the premises for their use. Modern technical systems (machines and military technology) are characterized by such features as: functionality, reliability, readiness, security, mobility, and operational vulnerability. Identification of threats to the functioning of technical systems through modeling therefore concerns the construction of models of the test object, the reconstruction of the state of the object and its prediction. The existing methods of identification can be divided into methods of identifying static and dynamic properties. The current availability of computers and simulation studies of the dynamics of objects allows attempts to identify the dynamic properties of objects throughout its life cycle, using various models. The considerations presented in this paper concern a modern approach to modeling the dynamic state of objects. The evolutionary dynamic models created in this way should improve the methodology and reasoning in the assessment of the dynamic state, often used for optimization and supporting operational decisions, which is the research niche of this article.

PL

Nowoczesne systemy techniczne stosowane w praktyce (maszyny, pojazdy, technika wojskowa) podlegają automatycznie degradacji stanu technicznego, co wymusza potrzebę modelowania oraz identyfikację zmian tego stanu. Dostępne metody modelowania identyfikacji zmian stanu technicznego takich systemów pozwalają na nadzorowanie powstających zagrożeń dla prawidłowości ich funkcjonowania. Celem pracy było przedstawienie dostępnych metod i narzędzi do modelowania i identyfikacji ewoluujących zagrożeń dla złożonych systemów technicznych w zakresie opisu i wskazań przesłanek do ich wykorzystania. Współczesne systemy techniczne (maszyny i technika wojskowa) charakteryzują się takimi cechami jak: funkcjonalność, niezawodność, gotowość, bezpieczeństwo, mobilność, podatność operacyjna. Identyfikacja zagrożeń dla funkcjonowania systemów technicznych poprzez modelowanie dotyczy więc budowy modeli badanego obiektu, rekonstrukcji stanu obiektu i jego predykcji. Istniejące metody identyfikacji można podzielić na metody identyfikacji właściwości statycznych i dynamicznych. Obecna dostępność komputerów i badań symulacyjnych dynamiki obiektów pozwala na podejmowanie prób identyfikacji właściwości dynamicznych obiektów w całym cyklu ich życia, przy użyciu różnych modeli. Przedstawione w artykule rozważania dotyczą nowoczesnego podejścia do modelowania stanu dynamicznego obiektów. Stworzone w ten sposób dynamiczne modele ewolucyjne powinny usprawnić metodologię i rozumowanie w ocenie stanu dynamicznego, często wykorzystywanych do optymalizacji i wspomagania decyzji operacyjnych, co stanowi niszę badawczą.

15

Water Supply Networks - performance modelling and assessment

Pietrucha-Urbanik Katarzyna, Tchórzewska-Cieślak Barbara, Eid Mohamed

Safety and Reliability of Systems and Processes

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2023

|

Summer Safety and Reliability Seminar 2023

175--186

EN

Performance modelling and assessment of Water Supply System (WSS) is a critical activity in system management process. It contributes into producing indicators necessary for the optimisation of the system operation, maintenance, safety, and resources use. The Water Supply Network (WSN) is a major component of any WSS. Assessing the performance of the WSN requires the development of dynamic-probabilistic models and the use of performance notions that are beyond the local availability and reliability of a cluster of pipes (mains, connections, and distributions) or nodes. The proposed performance notions are fully described in terms of performance-levels. The proposed modelling scheme is applied on a real WSN that has slightly been modified to preserve the didactic quality of the chapter and render the modelling scheme accessible at its first uses. Once the use of the scheme is mastered, its exploitation for real and complex WSN is straight forward.

16

Impact of Heating System Local Control on Energy Consumption in Apartment Buildings

Deshko Valerii, Bilous Inna, Maksymenko Oleksandra

Rocznik Ochrona Środowiska

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2023

|

Tom 25

77--85

EN

Improving the energy efficiency of residential buildings is ensured by improving the thermal protection characteristics and the wider introduction of control tools. In order to take into account the influence of individualisation of operating conditions, the study of the regulation of heating distribution of a single-pipe system with bypassed heating devices of a 5-storey typical for Ukraine mass building of the 80s after thermos-modernisation for conditions in Kyiv and Warsaw (Poland) was carried out. On the basis of the simulation model created in the Mathcad software environment for design/rated and average climatic conditions, the influence of internal heat flows into adjacent rooms on the distribution of energy consumption, changes in internal air temperature under the influence of local changes in the heating device flow coefficients were studied. The developed approaches, and the results obtained on the influence of local regulation of devices of vertical single-pipe heating systems can be used to clarify the distribution of energy consumption for heating between individual zones of apartment buildings.

17

Modelowanie stałoprądowych charakterystyk tranzystorów SiC-MOS mocy w programie SPICE

Bisewski Damian, Lubicz-Krośnicka Emilia

Przegląd Elektrotechniczny

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2023

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R. 99, nr 9

289--292

PL

Artykuł dotyczy problematyki komputerowego modelowania charakterystyk oraz parametrów tranzystorów MOS mocy wykonanych z węglika krzemu (SiC). W ramach realizacji pracy sformułowano oraz zaimplementowano w programie PSPICE autorski model rozważanego tranzystora, który bazuje na zmodyfikowanym modelu Shichmana-Hodgesa krzemowego tranzystora MOS. Opracowany model, w porównaniu do innych istniejących modeli tranzystora MOS wbudowanych w popularnych programach komputerowych, modeli firmowych, a także modeli opisanych w literaturze, cechuje się dużą dokładnością. Ponadto, zaproponowany model charakteryzuje się stosunkowo nieskomplikowaną budową, tzn. w zależnościach analitycznych opisujących ten model występuje zaledwie kilkanaście parametrów, których wartości można wyznaczyć korzystając z informacji zawartych w kartach katalogowych konkretnych typów tranzystorów albo na podstawie wyników pomiarów.

EN

The paper deals with the problem of computer modelling of characteristics and parameters of power MOSFETs made of silicon carbide (SiC). An original model of the considered transistor was formulated and implemented in the PSPICE program, which is based on the ShichmanHodges model of the silicon MOS transistor modified by the authors. In comparison to other existing MOS transistor models embedded in popular computer programs as well as models described in literature, the developed model exhibits high accuracy. Furthermore, the proposed model features a relatively simple structure, meaning that it includes only a few parameters in its analytical description. The values of these parameters can be determined based on the information provided in the datasheets of specific transistor types or through measurement results.

18

Adaptive type-1 fuzzy control of a wind energy conversion system based on a double-fed induction machine

Bensaadia Labib, Rouabhi Riyadh, Khodja Djalaleddine, Herizi Abdelghafour

Przegląd Elektrotechniczny

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2023

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R. 99, nr 8

110--115

EN

In this paper, we will develop an adaptive control algorithm applied to the wind energy conversion system (WECS) based on a double-fed induction machine (DFIM) driven by a turbine with variable blade pitch, and controlled through the rotor variables by two bidirectional converters. The main function of these converters in the considered system is the connection of the wind generator to the power grid in two different ways: one on the grid side converter which will allow continuous bus control and improve the power factor on the grid side; the other, on the converter on the rotor side, which will allow the control and optimization of the energy flow generated by the stator during the periods of operation of this system. In the first part we presented the individual modeling of the wind turbine chain, then we presented and developed the controls necessary to control the active and reactive powers produced by this system in order to ensure optimum performance and production quality.

PL

W niniejszym artykule opracujemy algorytm sterowania adaptacyjnego zastosowany w systemie konwersji energii wiatru (SKEW) oparty na dwustronnie zasilanej maszynie indukcyjnej (DZMI) napędzanej turbiną o zmiennym skoku łopatek i sterowanej poprzez zmienne wirnika dwoma dwukierunkowymi konwertery. Główną funkcją tych przekształtników w rozpatrywanym systemie jest podłączenie generatora wiatrowego do sieci elektroenergetycznej na dwa różne sposoby: jeden po stronie przekształtnika sieciowego, który umożliwi ciągłą kontrolę magistrali i poprawi współczynnik mocy po stronie sieci; drugi, na przekształtniku po stronie wirnika, co pozwoli na sterowanie i optymalizację przepływu energii generowanej przez stojan w okresach pracy tego układu. W pierwszej części przedstawiliśmy indywidualne modelowanie łańcucha turbiny wiatrowej, następnie przedstawiliśmy i opracowaliśmy sterowanie niezbędne do sterowania mocą czynną i bierną wytwarzaną przez ten system w celu zapewnienia optymalnej wydajności i jakości produkcji.

19

Projektowanie deskowań z wykorzystaniem technologii BIM

Szóstak Mariusz, Napiórkowski Mateusz

Przegląd Budowlany

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2023

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R. 94, nr 1-2

39--42

PL

Deskowania systemowe są powszechnie wykorzystywane na placach budowy. W artykule omówiono aspekt projektowania, doboru i modelowania deskowań. W ramach przeprowadzonych analiz wykonano przegląd dostępnych na rynku nakładek do modelowania deskowań wybranych producentów. Wykorzystując nakładkę PERI Library+ do programu Autodesk Revit zamodelowano przykładowy projekt deskowania ściennego i stropowego. Dodatkowo wykonano analizę przydatności modelowania, która pozwoliła na wskazanie korzyści, jaki zapewnia BIM w aspekcie deskowań systemowych.

EN

System formwork is commonly used on construction sites. The article discusses the aspect of designing, selection and modeling formwork. As part of the conducted analyses, authors present a review of plugins available on the market for formwork modeling from selected formwork manufacturers. Using the PERI Library+ plug-in for Autodesk Revit, authors modeled an example of wall and floor formwork project. In addition, an analysis of the usefulness of modeling was carried out, which allowed to indicate the benefits of BIM in aspect of system formwork.

20

Rationalization of the operation process of intrusion and hold-up alarm systems

Krzykowska-Piotrowska Karolina, Rosiński Adam, Paś Jacek

Prace Naukowe Politechniki Warszawskiej. Transport

|

2023

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z. 137

103--113

EN

Intrusion and hold-up alarm systems (I&HAS) are part of electronic security systems. They are now installed in many facilities, including those classified as critical infrastructure. The variety of available alarm control panels and their configurations means that I&HAS are installed with the use of alarm control panels with various functional and diagnostic capabilities. In the process of operation of intrusion and hold-up alarm systems, maintenance actions are most often used when no damage has occurred. This is referred to as preventive maintenance. These activities are aimed at carrying out preventive maintenance that will reduce the likelihood of damage or deterioration of the system. An extension and also an evolution of preventive maintenance activities is the development of the eMaintenance concept. By implementing modern solutions in diagnosing intrusion and hold-up alarm systems and using advanced IT applications, it is possible to monitor them and manage the operational process in real-time with the possibility of observing the degradation of the I&HAS. This makes it possible to take action to prevent the transition to a state of partial fitness or unfitness. As a result of the analysis of the operation process of the intrusion and hold-up alarm systems, taking into account diagnostic information, a graph of relations occurring in the system was developed. Then, dependencies were determined to calculate the probabilities of the I&HAS being in a state of full ability, states of periodic service, states of partial ability, and a state of unfitness. The issues of modelling the operation process of intrusion and hold-up alarm systems presented by the authors make it possible to rationalize the intensity of periodic inspections. The result is an increase in the value of the readiness index of I&HAS, which is particularly important in the case of securing critical infrastructure facilities.

PL

Systemy Sygnalizacji Włamania i Napadu (SSWiN) wchodzą w skład elektronicznych systemów bezpieczeństwa. Są one obecnie instalowane w wielu obiektach, w tym także tych zaliczanych do infrastruktury krytycznej. Różnorodność dostępnych central alarmowych i ich konfiguracji powoduje, że instalowane są SSWiN z zastosowaniem central alarmowych o różnych możliwościach funkcjonalnych i diagnostycznych. W procesie eksploatacji systemów sygnalizacji włamania i napadu stosuje się najczęściej działania obsługowe podejmowane kiedy nie wystąpiło uszkodzenie. Jest to określane jako utrzymanie profilaktyczne. Działania te mają na celu przeprowadzanie obsług zapobiegawczych, które zmniejszą prawdopodobieństwo uszkodzenia lub pogorszania funkcjonowania systemu. Rozwinięciem a zarazem też ewolucją działań z zakresu utrzymania profilaktycznego jest opracowanie koncepcji eUtrzymania. Poprzez wdrażanie nowoczesnych rozwiązań w obszarze diagnozowania systemów sygnalizacji włamania i napadu oraz zastosowanie zaawansowanych aplikacji informatycznych możliwe jest ich monitorowane i zarządzanie procesem eksploatacyjnym w czasie rzeczywistym z możliwością obserwowania degradacji SSWiN. Umożliwia to podejmowanie działań zapobiegających przejściu do stanu częściowej zdatności czy niezdatności. W wyniku przeprowadzonej analizy procesu eksploatacji systemu sygnalizacji włamania i napadu z uwzględnieniem informacji diagnostycznych opracowano graf relacji zachodzących w systemie. Następnie wyznaczono zależności umożliwiające obliczanie wartości prawdopodobieństw przebywania SSWiN w stanie pełnej zdatności, stanach obsług okresowych, stanach częściowej zdatności i stanie niezdatności. Przedstawione przez autorów zagadnienia modelowania procesu eksploatacji systemów sygnalizacji włamania i napadu umożliwiają racjonalizację intensywności realizacji przeglądów okresowych. Efektem tego jest zwiększenie wartości wskaźnika gotowości SSWiN, co jest szczególnie istotne w przypadku zabezpieczania obiektów infrastruktury krytycznej.