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Wyniki wyszukiwania dla: OPERATOR HELMHOLTZA
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Rozpoznawanie uszkodzeń w części przepływowej okrętowego turbinowego silnika spalinowego na podstawie wyników badania endoskopowego = Failures' recognising within the passages of a marine gas turbine engine on the basis of results of endoscopic investigation
PublikacjaThe paper deals with diagnostic issues concerning endoscopic examinations of marine gas turbine engines. There will be presented selected information about failures within the passages and accessible endoscopic methods and means enabling their detection. The author focuses on the endoscopic techniques and widely presents the possibilities of this quickly developed diagnostic method. There will be also presented representative results...
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Current risk analysis and management issues in technical systems.
PublikacjaDealing with the reliability and safety of industrial hazardous plants requires taking into account relevant interdisciplinary scientific knowledge and some existing approaches based on so-called good engineering practice, also those included in the international standards and guidelines. In this article an approach is proposed how to integrate the functional safety concept with information security aspects in the design and management...
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The use of spectrometric diagnostics in identification of the technical condition of tribological systems
PublikacjaThe paper presents, as an effect of the analysis of investigation results, a possibility of using the spectrometric diagnostics in the tribological system technical condition supervision arrangement. A model, based on the emission of solid particles in tribological system operation, allows to identify the system technical condition. After the analysis of tests carried out with the use of that model, it has been found that the content...
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Measurement techniques for assessing the olfactory impact of municipal sewage treatment plants
PublikacjaThe study presents information about the measurement techniques used for the assessment of air quality in terms of the olfactory intensity resulting from the operation of municipal sewage treatment plants. Advantages and disadvantages of the measurement techniques used are presented. Sources of malodourous substance emission from sewage treatment plants were described, and the malodourous substances emitted were characterised....
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Building modernization located in the conservation protection zone in the aspect of technical conditions
PublikacjaThe paper presents a description of the technical condition of the building after many years of operation and analyzes the impact of the current use and the lack of regular periodic repairs on the technical efficiency of the building. The influence of the technical solutions applied during the construction of the building on the current limitations related to the planned, target change in the way of use was discussed. Variant conceptual...
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Podsystem wizualizacji w adaptacyjnym synchronizatorze prądnic =The vizualizzation subsystem of adaptabile synchronizer of power generators
PublikacjaZamieszczono opis podsystemu wizualizacji układu automatycznej synchronizacji układu autopmatycznej synchronizacji prądnic pracującego wg opracowanej adaptacyjnej metody synchronizacji. Zawarto synchronizacje dot. zadań podsystemu wizualizacji wraz z prezentacją wybranych okien graficznego interfejsu uzytkownika. Omówiono również sposób realizacji podsystemu wizualizacji. Zwrócono uwagę na znaczenie i rolę dobrze zorganizowanej...
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VEHICLE DYNAMICS (2024)
Kursy Online(W) Vehicle dynamics (W-Lecture) - DAPE - WIMiO The course entitled "Vehicle dynamcs" (VD) is conducted for the DAPE WIMiO Students. The VD course is to discuss the following problems: - major problems of vehicle dynamics from the application point of view, - definition of working environment, - types of vehicles, - parameters and characteristics of vehicles, - assessment of performance of vehicles towards design, -...
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Wpływ ekologicznych czynników roboczych na efektywność układu sprężarkowej pompy ciepła (The impact of environmentally friendly refrigerants on heat pump efficiency)
PublikacjaArtykuł poświęcony jest zagadnieniu symulacji pracy układu sprężarkowej pompy ciepła. Prawidłowe zaprojektowanie instalacji oraz jej właściwe użytkowanie pozwala na zmniejszenie kosztów eksploatacji. Dokładna analiza techniczno-ekonomiczna umożliwia natomiast dobór elementów systemu o możliwie największej sprawności, a zatem niskim zapotrzebowaniu na energię. Zastosowanie układów opartych o perspektywiczne, proekologiczne czynniki...
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Management of MV/LV Transformer Replacement Based on AMI Platform
PublikacjaThe paper presents the extended possibilities of managing the selection and replacement of MV/LV transformers using the measurement data from the Advanced Metering Infrastructure (AMI) system. The analysis was conducted on samples of over 1900 transformers that operate in two different types of MV grids: rural and urban. The analysis has shown that there is a great potential in the field of optimizing the rated power of the transformers.
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Wpływ kąta odcięcia horyzontu na dokładność wyznaczeń GPS
PublikacjaW artykule zaprezentowano wyniki eksperymentu, którego celem było zbadanie wpływu kąta odcięcia horyzontu (kąta maski) na dokładność wyznaczeń GPS. Zagadnienie to było już poruszane na łamach publikacji dotyczących nawigacji satelitarnej, jednak coraz to dokładniejsze modele jonosfery i troposfery usprawiedliwiają, zdaniem autora, prowadzenie okresowych badań w tym zakresie. Kąt maski jest wprowadzany przez operatora odbiornika...
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Stany przejściowe przy sterowaniu maszyną dwustronnie zasilaną pracującą jako generator w farmie wiatrowej
PublikacjaW artykule przedstawiono analizę stanów przejściowych farmy wiatrowej z generatorami asynchronicznymi dwustronnie zasilanymi z uwzględnieniem linii kablowej SN. Przyjęto układ sterowania generatorem oparty na multiskalarnym modelu maszyny. Przedstawiono rozpływy mocy czynnej i biernej w stanach przejściowych na zaciskach generatora oraz w punkcie przyłączenia farmy wiatrowej do sieci elektroenergetycznej.Pokazano wpływ parametrów...
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A decision-making system supporting selection of commanded outputs for a ship's propulsion system with a controllable pitch propeller
PublikacjaThe ship's operators have to make decisions regarding the values of commanded outputs (commanded engine speed and pitch ratio) which ensure maximum vessel speed and minimum fuel consumption. Obviously, the presented decision problems are opposed. Therefore, there is a need for a compromise solution that enables more flexible vessel voyage planning. This paper deals with development of a computer-aided system supporting selection...
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Fractional Order Dynamic Positioning Controller
PublikacjaImproving the performance of Dynamic Positioning System in such applications as station keeping, position mooring and slow speed references tracking requires improving the position and heading control precision. These goals can be achieved through the improvement of the ship control system. Fractional-order calculus is a very useful tool which extends classical, integer-order calculus and is used in contemporary modeling and control...
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Inlet air fogging of marine gas turbine in power output loss compensation
PublikacjaThe use of inlet air fogging installation to boost the power for gas turbine engines is widely applied in the power generation sector. The application of fogging to mechanical drive is rarely considered in the literature [1]. This paper will cover some considerations relating to its application to gas turbines in ship drive. There is an important evaporative cooling potential throughout the world when the dynamic data is evaluated,...
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Living and working beneath the sea – next approach
PublikacjaThe idea of living beneath the sea is very new if compared with millennia of shipping activity. In fact, ocean surface was considered mainly as medium suitable for transport of persons and goods as well as aggression and robbery. More practical attempts to live “on” the water surface are limited to well protected internal waters. The presented concept of “an underwater-above water accommodation, especially for residential purposes”...
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The use of various species of fungi in biofiltration of air contaminated with odorous volatile organic compounds
PublikacjaAir pollution with odorous compounds is a significant social and environmental problem. This paper presents biological deodorization methods. The attention is focused on the application of biotrickling filters for air deodorization. Principles of their operation are discussed, indicating the key role of the selection of microorganisms responsible for the degradation of odorous compounds. A literature overview of the used fungal...
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INFLUENCE OF INLET GEOMETRY ON THE EFFICIENCY OF 1MW STEAM TURBINE
PublikacjaThe process of the design of the 1MW steam turbine includes designing the stator and rotor blades, the steam turbine inlet and exit, the casing and the rotor. A turbine that operates at rotation speeds other than 3000 rpm requires a gear box and generator with complex electronic software. This paper analyses the efficiency of eight turbine variants, including seven inlet geometries and three stages of stator as well as an eight...
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Investigation of energy deposition and its optical imaging in polymer gel dosimeters
PublikacjaThis following chapter describes methods for verifying the absorbed dose during radiotherapy. Special attention is paid to the method using polymer-gel dosimeters, the dose reading of which is performed by means of Laser Computed Tomography. The chapter also includes considerations on alternative solutions for dosimetric measurements and various types of radiotherapy and their pros and cons. In addition, both the methods of structural...
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A method for evaluating durability of porous slide bearings
PublikacjaThe article presents the structures of porous bearings bushes and greasy lubricants, and the similarity criterion resulting from this structures. A phisical model is proposed which describes the operation of the porous slide bearing bush taking into account, via analogy, the phenomena taking place in the grease lubricant nodes instead of those observed in the bush structures.Included are the result of experimental tests of three...
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Wideband Signal Generation for Jamming Radio-Controlled Improvised Explosive Devices
PublikacjaThis paper focuses on modelling operation of a wideband jamming signal generator, considering the effects present in real device which influence the shape of transmitted signal’s spectrum. Introduction is followed by a brief overview of AEGIS project, aim of which is to develop a mobile generator of electromagnetic curtain. Next, simulation model is described which includes the factors...
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Sampling Procedures in Studies of Cloud Water Composition: A Review
PublikacjaThe authors set out and classify the principles of operation of known types of cloud water collectors, and critically review their advantages and drawbacks. Analysis of the literature has yielded information on the parameters of various type of collectors—sampling time, the type of cloud from which the water sample was taken, droplet diameter collected with 50% efficiency (cut off), sample analytes/ parameters determined, types...
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Computer-aided Analysis of Induced Sheath Voltages in High Voltage Power Cable System
PublikacjaThis paper concerns the effect of configuration of high voltage power cables on induced voltages in their metallic sheaths. One, two or three cables per phase and phase sequence of the cables are considered. Computing of the voltages was performed for a normal operation and in case of earth fault. Various ways of the sheaths bonding are considered as well. Shock hazard and voltage stress of non-metallic outer sheath of cables are...
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Interconnect charging standarization.
PublikacjaZbadano istniejące ETSI i ITU standardy sygnalizacyjne, które majadoczynienia z zaliczaniem w konkurencyjnym, zliberalizowanym iwielooperatorskim środowisku, jakie dzisiaj istnieje. Porównano normy i omówiono możliwości ich zastosowania oraz ich ograniczenia. Podkreślono, co powinno być zauważone podczas implementacji aplikacji bazowanych na tych normach. Artykuł ten powinien być użyteczny dla inżynierów systemowych, a także dla...
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Redesign of the Research Platform for Monitoring, Control and Security of Critical Infrastructure Systems
PublikacjaCritical Infrastructure Systems (CISs) play a key role in modern societies. Their sustainable operation depends heavily on the performance of dedicated structures and algorithms targeting monitoring, control and security aspects. In previous work a Research Platform (RP) for the design and simulation of such systems was presented. This works updates the information on the RP through the description of major hardware and software...
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New Design of Axial Piston Pump with Displaced Swash Plate Axis of Rotation for Hydro-Mechanical Transmissions
PublikacjaThis paper presents a prototype design of an axial piston pump with displaced swash plate axis of rotation in two directions of discharge with electronic control intended for installation on a hydraulic-mechanical gearbox dedicated to working machines. The effect of displacement of the swash plate rotation axis on dead space volume and volumetric efficiency is presented. The construction and principle of operation of the capacity...
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Logistyka twarda HL w centrach obsługi przesyłek.
PublikacjaRozwój usług internetowych powoduje zmniejszenie liczby przesyłek listowych oraz wzrost liczby przesyłek paczkowych. Także nowe standardy obsługi klienta, wprowadzane przez konkurencyjnych operatorów sieci przesyłek ekspresowych, wymusza wprowadzanie nowych rozwiązań logistycznych - zwłaszcza w zakresie logistyki twardej HL - przez monopolistyczne do niedawna poczty państwowe. Przedstawiono założenia strategii oraz rozwiązania...
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A Method of MOS Evaluation for Video Based Services
PublikacjaThis paper deals with a method for QoE evaluation for the services transmitting large amount of data perceived by the end user in relatively short time periods, e.g. streaming video in mobile operator...
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Call Processing Performance in a Multidomain IMS/NGN with Asymmetric Traffic
PublikacjaIn this paper we continue our research using the previously proposed analytical traffic model of a multidomain Next Generation Network (NGN), which is standardized for delivering multimedia services based on the IP Multimedia Subsystem (IMS). The aim of the model is to assess mean Call Set-up Delay (CSD) and mean Call Disengagement Delay (CDD), which are standardized call processing performance parameters. The output variables...
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Risks associated with the transportation of hazardous materials on public roads
PublikacjaA significant proportion of the transport of hazardous materials is carried out on public roads. Therefore, the safety of such transport is becoming increasingly important. Every catastrophe involving hazardous materials has a negative impact on direct road users and the surrounding environment, becauses its range is mostly not local. It follows that in the event of such catastrophe, its effects should be minimized. This is possible...
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Quantum privacy witness
PublikacjaWhile it is usually known that the mean value of a single observable is enough to detect entanglement or its distillability, the counterpart of such an approach in the case of quantum privacy has been missing. Here we develop the concept of a privacy witness, i.e., a single observable that may detect the presence of the secure key even in the case of bound entanglement. Then we develop the notion of secret-key estimation based...
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Modelling and Analysis of the Positioning Accuracy in the Loading Systems of Mobile Cranes
PublikacjaIn this work, the authors analyse the influence of the order and range of sequential movements of a crane's working members on the accuracy of the final cargo positioning. The analysis was conducted on the basis of a specially developed method in which the authors proposed the introduction of a geometrical indicator of positioning the load in the intermediate positions (after completing each movement sequence) and in the target...
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The Impact of Material Selection on Durability of Exhaust Valve Faces of a Ship Engine – A Case Study
Publikacjawo alloys were used in order to extend the service life of marine engine exhaust valve head. Layers of cobalt base alloys were made of the powders with with chemical composition as follow: the layer marked L12; C-1,55%; Si-1,21%; Cr-29,7%; W-9%; Ni-2%; Mo<0,01%; Fe-1,7%; Co-54,83% and the layer marked N; C-1,45%; Co-38,9%; Cr-24,13%; Ni-10,43%; W-8,75%; Fe-7,64%; Mo-7,56%; Si-2,59%. Base metal was valve steel after heat treatment....
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Should we seek further improvement of fluid film bearings - what for and how?
PublikacjaFluid film bearings have been extensively used in the industry because of their unbeatable durability and extremely low friction coefficient. Large bearings supporting shafts of huge and important rotating machines constitute a special group of fluid film bearings since the reliability of crucial systems, like for example electro-energetic system, rely on their trouble-free operation. Large thrust bearings, apart from enormous...
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Autonomous port management based AGV path planning and optimization via an ensemble reinforcement learning framework
PublikacjaThe rapid development of shipping trade pushes automated container terminals toward the direction of intelligence, safety and efficiency. In particular, the formulation of AGV scheduling tasks and the safety and stability of transportation path is an important part of port operation and management, and it is one of the basic tasks to build an intelligent port. Existing research mainly focuses on collaborative operation between...
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Surface modifcation of PMMA polymer detected by XPS
Dane BadawczeIn order to obtain the experimental specimens, four PMMA/PC61BM samples with the following mass proportions were prepared: 10%, 20%, 30%, and 40%. In addition, as a reference, a PMMA sample without PC61BM was prepared as well. For the fabrication process, PC61BM 99.5% (Solenne BV), chloroform HPLC (Sigma Aldrich), and PMMA (commercially available...
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The thermal effort during marine steam turbine flooding with water
PublikacjaThe work discussed an extreme case of cooling a steam turbine. The ship's steam turbine was used as an example. In marine transport units with low-speed engines dominate, however, there are also units with steam turbines. An example of analysed marine steam turbine is shown in Fig. 1. When considering the issue of cooling steam turbines, it is necessary to estimate the extreme conditions that may occur during operation of the turbine....
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All-gather Algorithms Resilient to Imbalanced Process Arrival Patterns
PublikacjaTwo novel algorithms for the all-gather operation resilient to imbalanced process arrival patterns (PATs) are presented. The first one, Background Disseminated Ring (BDR), is based on the regular parallel ring algorithm often supplied in MPI implementations and exploits an auxiliary background thread for early data exchange from faster processes to accelerate the performed all-gather operation. The other algorithm, Background Sorted...
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CURRENT TRENDS IN RECYCLING OF PHOTOVOLTAIC SOLAR CELLS AND MODULES WASTE
PublikacjaIn comparison to other energy producing techniques, photovoltaics (PV) is one of the most promising options: no emission of any matter into the environment during operation; extremely long operation period (estimated average: 25 years), minimum maintenance, robust technique, aesthetic aspects. The use of photovoltaics is rapidly increasing, and the respective market is developing accordingly. Although PV manufacturing equipment...
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Recycling of Photovoltaic Solar Cells and Modules - Te State - Of - Art
PublikacjaIn comparison to other energy producing techniques, photovoltaics (PV) is one of the most promising options: no emission of any matter into the environment during operation; extremely long operation period (estimated average: 25 years), minimum maintenance, robust technique, aesthetic aspects. The use of photovoltaics is rapidly increasing, and the respective market is developing accordingly. Although PV manufacturing equipment...
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Investigation of the Combustion Processes in the Gas Turbine Module of an FPSO Operating on Associated Gas Conversion Products
PublikacjaIn this paper, we consider the issue of thermo-chemical heat recovery of waste heat from gas turbine engines for the steam conversion of associated gas for offshore vessels. Current trends in the development of offshore infrastructure are identified, and the composition of power plants for mobile offshore drilling units and FPSO vessels is analyzed. We present the results of a comparison of power-to-volume ratio, power-to-weight...
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Partial inhibition of borohydride hydrolysis using porous activated carbon as an effective method to improve the electrocatalytic activity of the DBFC anode
PublikacjaCarbon materials are commonly used catalyst supports in various types of fuel cells. Due to the possibility of designing their properties, they seem to be attractive and functional additives. In Direct Borohydride Fuel Cells (DBFCs), the electrooxidation reaction of borohydride competes with the undesirable hydrolysis reaction, therefore our work aimed to modify anodes based on a multi-component hydrogen storage alloy with a small...
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Multiresolution analysis and adaptive estimation on a sphere using stereographic wavelets
PublikacjaWe construct an adaptive estimator of a density function on d dimensional unit sphere Sd (d ≥ 2), using a new type of spherical frames. The frames, or as we call them, stereografic wavelets are obtained by transforming a wavelet system, namely Daubechies, using some stereographic operators. We prove that our estimator achieves an optimal rate of convergence on some Besov type class of functions by adapting to unknown smoothness....
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Wykorzystanie rejestracji przebiegów szybkozmiennych do weryfikacji modeli dynamicznych KSE
PublikacjaW referacie przedstawiono koncepcję narzędzia pozwalającego na weryfikowanie parametrów modeli dynamicznych elementów KSE. Narzędzie wykorzystuje program obliczeniowy PSLF, stosowany powszechnie przez operatora systemu przesyłowego. Nowatorstwo polega na wykorzystaniu dodatkowej aplikacji (programu w systemie MS Windows), która steruje pracą programu obliczeniowego. Powstaje w ten sposób tandem wygodnego interfejsu użytkownika...
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Wykorzystanie rejestracji przebiegów szybkozmiennych do weryfikacji modeli dynamicznych KSE
PublikacjaW referacie przedstawiono koncepcję narzędzia pozwalającego na weryfikowanie parametrów modeli dynamicznych elementów KSE. Narzędzie wykorzystuje program obliczeniowy PSLF, stosowany powszechnie przez operatora systemu przesyłowego. Nowatorstwo polega na wykorzystaniu dodatkowej aplikacji (programu w systemie MS Windows), która steruje pracą programu obliczeniowego. Powstaje w ten sposób tandem wygodnego interfejsu użytkownika...
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Modelowanie, sterowanie i wizualizacja quadrocoptera
PublikacjaArtykuł przedstawia podejście do budowy modelu matematycznego quadrocoptera. Głównym celem budowy modelu było zaprojektowanie odpowiedniego sterowania obiektu oraz analiza jego zachowania się w różnych sytuacjach. Jako założenie przyjęto budowę modelu, systemu sterowania oraz wszelkich towarzyszących algorytmów w otwartym środowisku programistycznym, co pozwoli na późniejszą ich implementację w rzeczywistym obiekcie, bez konieczności...
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Problemy edukacji technicznej
PublikacjaNa jakość wyrobów istotny wpływ ma działanie człowieka w całym procesie ich powstawania. Wskazano na związek działania każdego systemu technicznego z poziomem wykształcenia człowieka - inżyniera, jako twórcy i operatora tego systemu. Omówiono główne problemy związane z kształceniem w zakresie przedmiotów technicznych oraz dokonano analizy różnorodnych form oddziaływania na słuchacza w procesie tego kształcenia. Przedstawiono niektóre...
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Investigation of Transmit and Receive Characteristics of Laboratory Model for the Parametric Echosounder
PublikacjaInvestigation and operation of devices based on nonlinear interaction of high-intensity waves have been carried out for several decades. However, it is still a new tool to study the properties of the water environment and especially the upper layers of the seabed. This paper describes the results of tests of the new device that is intended to be applied for sounding underwater areas. The device has been designed and built in collaboration with...
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Analysis of inductive power transfer systems for variable air gap and voltage supply frequency
PublikacjaThe paper describes an IPT system, by which electrical energy may be transmitted through a large air gap between coils without electrical connection. It presents theoretical and simulation analysis of IPT, which allows for supplying a receiver in the conditions of slow, in relation to the dynamics of power supply, changes in dimension of the air gap. The influence of frequency characteristics of the system on the possible selection...
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Autorska implementacja systemu wymiany numera-cji telefonicznej pomiędzy operatorami voip
PublikacjaW pracy przedstawiono autorską implementację systemu wymiany numeracji. System został stworzony w technologii Java, wykorzystując otwarte rozwiązania bazodanowe MySQL oraz PostgreSQL. System został przetestowany dla kilku klientów/operatorów wykorzystujących pule z ponad milionem numerów telefonicznych. W pracy wykazano spełnienie podstawowych wymagań narzucanych na system, w szczególności czas odpowiedzi systemu informacji o numerze...
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Analiza jakości baz geolokalizacyjnych numerów IP
PublikacjaW pracy określono wymagania geolokalizacyjne dla telefonii VoIP przy realizacji usług ratunkowych. Przedstawiono metodykę oraz wyniki badań komercyjnych baz geolokalizacyjnych. Do badań wykorzystano dane geolokalizacyjne uzyskane od operatorów. Wnioski wypływające z badań są pesymistyczne, a ocena jakości badanych baz pod kątem trafności geolokalizacji użytkowników telefonów VoIP znacznie odbiega od samooceny firm, które te bazy...