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Search results for: RAILWAY TRACK GEOMETRY
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Mobile satellite measurements on the Pomeranian Metropolitan Railway
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Dynamics of Railway Vehicles Movement on Transition Curves
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Effect of the saw blade geometry at its static stiffness
PublicationW artykule opisano wpływ wybranych parametrów piły tarczowej wpływających w istotny sposób na jej sztywność statyczną.
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INFLUENCE OF INLET GEOMETRY ON THE EFFICIENCY OF 1MW STEAM TURBINE
PublicationThe 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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Analyzing the Geometry of the Turnouts and Their Adjustment Basing on the Tacheometer Measurements
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The effect of heat exchanger geometry on adsorption chiller performance
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The hydromechanics of hydrocephalus: Steady-state solutions for cylindrical geometry
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Elementary, binary and schlesinger transformations in differential ring geometry
PublicationPrzedstawiono elementarne przekształcenia Darboux dla rozwiązania równań różniczkowych w pierścieniu. Przedstawiono nowe rozwiązania za pomocą przekształcenia Shlesingera jako granicy elementarnego pD.
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The influence of sound track on the viewer’s emotions and correction of the color in the film
PublicationThe article presents the aspects of the final selection of colors in film production based on the emotions caused by the soundtrack of the film. First, the processing of colors, contrast, saturation and white balance of shots in the film was presented. The definition of color grading is also described, i.e. the color changes in the film's views. In the second part of the article, the soundtracks of the film were analyzed, in particular...
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User Orientation Detection in Relation to Antenna Geometry in Ultra-Wideband Wireless Body Area Networks Using Deep Learning
PublicationIn this paper, the issue of detecting a user’s position in relation to the antenna geometry in ultra-wideband (UWB) off-body wireless body area network (WBAN) communication using deep learning methods is presented. To measure the impulse response of the channel, a measurement stand consisting of EVB1000 devices and DW1000 radio modules was developed and indoor static measurement scenarios were performed. It was proven that for...
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State-of-the-art framework for high-speed camera and photogrammetric use in geometry evaluation of prestressed concrete failure process
PublicationPrestressed structures are a key to the realization of the boldest architectural ideas, regardless of shape complexity, great height and large span. A characteristic feature of the prestressed structure is the better use of concrete material properties by insertion of internal forces. The internal forces are opposed to external loads effects (forces and deformations of structure). Prestressed reinforced concrete beams are characterized...
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EXPERIMENTAL AND NUMERICAL INVESTIGATION ON SPECIMEN GEOMETRY EFFECT ON THE CTOD VALUE FOR VL-E36 SHIPBUILDING STEEL
PublicationThere are special cases in the marine industry, where additional material tests, such as the fracture toughness test, must be performed. Additional fracture toughness tests, such as CTOD (Crack Tip Opening Displacement), are typically performed on three-point bend specimens. The dimension that defines all the specimen dimensions is the thickness of the material to be tested. It is recommended by classification societies (e.g. DNVGL)...
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The geometry of free-standing titania nanotubes as a critical factor controlling their optical and photoelectrochemical performance
PublicationTitanium dioxide nanotubes are regarded as one of the most important functional materials and due to their unique electronic properties, chemical stability and photocorrosion resistance, they find applications in, for example, highly efficient photocatalysis or perovskite solar cells. Nevertheless, modification of TiO2 nanotubes is required to overcome their main drawback, i.e. large energy bandgap (>3.2 eV) limiting their ability...
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Analysis of energy efficiency of suburban railway transport network
PublicationRising numbers of agglomeration residents cause increased need for people movement on daily basis. Because of congestion of local roads, air pollution and limited parking space, providing mass transit based on electric traction is reasonable. While the electric rail vehicles are considered highly efficient in themselves, they need to be analyzed as a part of a transport network, because energy consumption depends on operating conditions...
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Methods of mapping out the route contour of a railway line
PublicationStosowane obecnie toromierze elektroniczne wykorzystywane są przede wszystkim do pomiaru geometrii toru. Dane z pomiarów mogą być również wykorzystane w procesie projektowania regulacji toru (np. podczas usuwania dołków). W referacie przedstawiono metodę wyznaczania profilu podłużnego linii kolejowej na podstawie pomierzonych nierówności pionowych. Wyznaczony w ten sposób profil w dalszym etapie wykorzystany by był w projektowaniu...
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EXPERIMENTAL RESEARCH ON INFLUENCE OF THE FUEL NOZZLE GEOMETRY ON THE FUEL CONSUMPTION OF THE MARINE 4-STROKE DIESEL ENGINE
PublicationThe article presents experimental research that has been carried out on a marine, 4-stroke, 3-cylinder, turbocharged engine. During testing, the engine operated at a constant rotational speed of 750 rpm and a load from 0 kW to 280 kW. The engine was fuelled by diesel oil of known specification and loaded by electric generator with water resistance. The fuel consumption was measured during the engine operation with fuel nozzles...
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An experimental investigation on the effect of new continuous core-baffle geometry on the mixed convection heat transfer in shell and coil heat exchanger
PublicationIn the article, the authors presented the influence of continuous core-baffle geometry at mixed convection heat transfer in shell and coil heat exchanger. Experiments were carried out for a large power range, i.e. from 100W to 1200W and mass flow rates ranging from 0.01 kg/s to 0.025 kg/s. During the experiments, the mass flow rate of cooling water, the temperature of water at the inlet and outlet as well as the wall temperature...
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The role and scope of architectural and conservation research procedures in the process of restoring the splendour of an architectural monument created after 1945 on the example of the Suburban Railway Station in Gdynia
PublicationModern Movement buildings, despite their relatively recent construction, are sometimes affected by radical transformations of layout and form. The railway stations being one of the most important public buildings in the city are a special group of them. Due to long-term and intensive use they may bear the signs of exploitation of parts of its substance and have secondary transformations disharmony with the building. The subject...
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The In-Depth Studies of Pulsed UV Laser-Modified TiO2 Nanotubes: The Influence of Geometry, Crystallinity, and Processing Parameters
PublicationThe laser processing of the titania nanotubes has been investigated in terms of morphology, structure, and optical properties of the obtained material. The length of the nanotubes and crystallinity, as well as the atmosphere of the laser treatment, were taken into account. The degree of changes of the initial geometry of nanotubes were checked by means of scanning electron microscopy, which visualizes both the surface and the cross-section....
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Search for optimum geometry of selected steel sandwich panel joints
PublicationZastosowanie stalowych paneli typu sandwich w konstrukcjach okrętowych wymaga rozwiązania wielu problemów. Jednymi z trudniejszych zagadnień związanych z tymi nowymi strukturami są połączenia pomiędzy panelami oraz między panelami i konstrukcją innego typu. Artykuł przedstawia poszukiwanie optymalnej geometrii połączenia typu panel-panel w układzie wzdłużnym, przy użyciu parametrycznego modelu w programie ANSYS. Poszukiwano konfiguracji...
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Determination of geometry and positions of circular saw teeth with pinpoint accuracy.
PublicationEfekty ekonomiczne procesu przecinania sa współzależne z dokładnością użytego narzędzia szczególnie gdy ma sie do czynienia z cięciem piłą tarczową posiadajacą małe wartości rzazu. W tym przypadku wszelkie niedokładności geometrii ostrza w płaszczyznach natarcia i przyłożenia powinny być określone już na etapie wytwarzania pił. Dotyczy to również położenia ostrzy w kierunkach osiowym i promieniowym piły. Te wszystkie wspomiane...
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Critical conditions of hydrogen-air detonation in partially confined geometry
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Optimization of the geometry of the crankshaft for an internal combustion engine with heat regeneration
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A Method and Device for 3D Recognition of Cutting Edge Micro Geometry
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Examination of tools of different materials edge geometry for MDF milling
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The Study of Geometry of the Selected Transition Curves in the Design of Circular Roads
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Modeling Reservoir Gas Permeability Tests for Cylindrical and Spherical Geometry
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The use of tamping machine for diagnosising the longitudinal forces in rails of CWR track
PublicationW pracy przedstawiono przebieg prowadzonych od kilkunastu lat w Politechnice Gdańskiej badań nad wyznaczaniem sił podłużnych w szynach toru bezstykowego. Opisano skonstruowaną aparaturę pomiarową. Badania eksperymentalne polegały na podnoszeniu, a następnie poprzecznym nasuwaniu rusztu torowego za pomocą podbijarki. Rejestrowano przy tym wartości przemieszczeń toru oraz odkształcenia siłowników hydraulicznych. W rezultacie ostatnich...
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GNSS INVENTORY OF HISTORIC NARROW-GAUGE RAILWAY LINE IN KOSZALIN UNDER EXTREMELY UNFAVORABLE MEASUREMENTS CONDITIONS FROM THE POINT OF VIEW OF SATELLITE SIGNALS AVAILABILITY
PublicationA team of academic researchers from the Gdańsk University of Technology, Gdynia Maritime University and the Polish Naval Academy have been working since 2009 on the methodology of using active GNSS geodetic networks for geodetic inventory of railways and on adapting this measurement technique for designing geometric layouts of railway and tram lines. Over the years, the team tested a variety of configurations of receivers and settings...
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New approach to railway noise modeling employing Genetic Algorithms
PublicationMain goal of this paper was to describe an innovative method of noise prediction based on Genetic Algorithms. First part of the paper addresses the problem of growing noise, mainly in the context of a unified method for measuring noise. Further, Genetic Algorithms are described with regards to their fundamental features. Further a description is provided as to how Genetic Algorithms were used in the area of noise modeling. Next...
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Visual method for detecting critical damage in railway contact strips
PublicationEnsuring an uninterrupted supply of power in the electric traction is vital for the safety of this important transport system. For this purpose, monitoring and diagnostics of the technical condition of the vehicle's power supply elements are becoming increasingly common. This paper presents a new visual method for detecting contact strip damage, based on measurement and analysis of the movement of the overhead contact line (OCL)...
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Correction of determined coordinates of railway tracks in mobile satellite measurements
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Analysis of geometrical layout of tram tracks based on the railway methods
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DISPLACEMENT MEASUREMENTS DURING LOAD TESTING OF THE RAILWAY ARCH BRIDGE
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Research on and Assessment of the Reliability of Railway Transport Systems with Induction Motors
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Exploitation of selected railway equipment - conducted disturbance emission examination
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Hopping or Tunneling? Tailoring the Electron Transport Mechanisms through Hydrogen Bonding Geometry in the Boron-Doped Diamond Molecular Junctions
PublicationMechanisms of charge transport in molecular junctions involving hydrogen bonds are complex and remain mostly unclear. This study is focused on the elucidation of the electron transfer in a molecular device consisting of two boron-doped diamond interfaces bound with an aromatic linker and a hydrogen bonding surrogating molecule. The projected local density of states (PLODS) analysis coupled with transmission spectra and current−voltage...
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Influence of ducting geometry on working parameters of pipe type hydraulic turbines
PublicationMała energetyka wodna. Omówiono własności użytkowe - głównie, sprawność i adaptacyjność - uzyskiwane poprzez rozwiązania układów turbinowych stosowanych w obszarze zagospodarowywania piętrzeń niskospadowych. Wskazano przyczyny od których te własności zależą. Pokazano też przykład rozwiązania o pożądanych własnościach dla zagospodarowywania obiektów w mało atrakcyjnym ekonomicznie obszarze piętrzeń najniższych.
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Neural Network Application for Recognition of Geometry Degradation of Power Cycle Components
PublicationPrzedyskutowano problem rozpoznawania degradacji geometrycznej. Skuteczne zastosowanie wybranego typu sieci neuronowej (SSN) jest prezentowane w referacie. SSN wykrywająca typy degradacji geometrycznej wykazała wysoką jakość. Pokazano pewną możliwość ekstrapolacji takich SSN. Pokazano możliwość wykrywania typów degradacji geometrycznej nawet w przypadku pozyskiwania niepełnych danych pomiarowych.
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Electrostatic Zipping Actuators—Analysis of the Pull-In Effect Depending on the Geometry Parameters
PublicationContinuous work on a new generation of actuators, referred to as artificial muscles, resulted in the initiation of work on electrostatic zipping actuators, the concept of which is derived from micro electro-mechanical devices. Despite partial knowledge of their basic operating parameters, a question remains whether electrostatic zipping actuators are able to meet the expectations in the context of generated forces and control possibilities....
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Optimized Stress and Geometry Control of Spherical structures under Lateral Loadings
PublicationIn this paper, a numerical model of a double-layer spherical structure has been examined under lateral loadings. When the structure has been distorted due to loadings, the dislocated joints have been moved to their original positions utilizing the adjustment techniques based on the force method. Meanwhile, the members’ internal forces were kept in the desired domain. Optimization techniques were also implemented in order to minimalize...
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High accuracy multisensor hydroacoustic system for models of trawl geometry measurements
PublicationW pracy przedstawiono wieloelementowy hydroakustyczny system do pomiaru modeli włoków. System został zaprojektowany dla Akademii Rolniczej w Szczecinie i umożliwia precyzyjny pomiar geometrii projektowanych tam narzędzi połowowych w tym selektywnych worków dorszowych. Zastosowanie małych hydrofonów o wysokiej częstotliwości pracy oraz cyfrowego przetwarzania sygnałów z analizą korelacyjną umożliwiło uzyskanie bardzo dużej dokładności...
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Divination from chips: monitoring of the sawing process with chip geometry analyzes
PublicationWióry (trociny) są niechcianym produktem towarzyszącym procesowi przecinania. Jednakże, niosą one w sobie wiele informacji świadczących o przebiegu procesu obróbki. Metoda oceny składu procentowego wiórów - ich frakcji - jest prosta lecz ma szereg ważnych ograniczeń. W pracy zaprezentowano nowy alternatywny sposób pomiaru geometrii wiórów. Przedstawiono wyniki dla skrawania drewna mrożonego i nie mrożonego. Wyniki uzyskane ta metodą...
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Evolutionary Ship Track Planning within Traffic Separation Schemes – Evaluation of Individuals
PublicationThe paper presents an extended version of the author’s Evolutionary Sets of Safe Ship Trajectories method. The method plans safe tracks of all ships involved in an encounter including speed reduction manoeuvres, if necessary, and taking into account Rule 10 of COLREGS, which specifies ships’ behaviour within Traffic Separation Schemes governed by IMO. The paper focuses on the evaluation phase of the evolutionary process and shows...
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DIFFERENTIAL GEOMETRY AND ITS APPLICATIONS
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International Electronic Journal of Geometry
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Journal of Geometry and Symmetry in Physics
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Analysis and Geometry in Metric Spaces
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Eurographics Symposium on Geometry Processing
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Proceedings of the International Geometry Center
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