2017 - Repozytorium publikacji - Politechnika Gdańska

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Publikacje z roku 2017

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Design and Application of Magnetic Photocatalysts for Water Treatment. The Effect of Particle Charge on Surface
- Anna Zielińska-Jurek
- Zuzanna Bielan
- Szymon Dudziak
- Izabela Malinowska
- Zuzanna Sobczak
- Tomasz Klimczuk
- Grzegorz Nowaczyk
- Jan Hupka
2017 Pełny tekst Catalysts
Core-interlayer-shell Fe3O4/SiO2/TiO2, CoFe2O4/SiO2/TiO2 and BaFe12O19/SiO2/TiO2 magnetic photocatalysts were obtained. A water-in-oil microemulsion system with suitable surfactants was used for functionalization of the magnetic core with silica interlayer and TiO2-based photocatalyst. Uncoated and coated particles were characterized by electrophoretic meaurements, X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmision electron microscopy (TEM), specific surface area (BET) measurements, diffuse reflectance spectroscopy (DRS) and vibrating sample magnetometer (VSM) analysis. The pH of the solution and corresponding zeta potential was found to be essential for appropriate formation of ferrite core/silica layer/TiO2 shell nanocomposite, since the electrical charge controls interactions during functionalization of the magnetic core particles.
DESIGN AND CONSTRUCTION OF TILTED WALLS IN ACCORDANCE WITH CODES' PROVISIONS ON THE EXAMPLE OF THE CONSTRUCTION OF THE MUSEUM OF THE SECOND WORLD WAR IN GDAŃSK
- Marta Hirsz
- Krystyna Nagrodzka-Godycka
2017 Pełny tekst
The purpose of this article was to introduce the design and construction of tiled walls in accordance to codes' restrictions. The construction of the Museum of the Second World War in Gdańsk was chosen to be an example of its successful use in practice. Theoretical knowledge was based on PN-EN 1992-1-1:2008 and fib Model Code for Concrete Structures 2010. Although codes' recommendations seem curt, practice prove structural advance. Working as a site engineer, one of the Authors had an inside view on the construction of the Museum of the Second World War in Gdańsk. Museum’s architectural plan has been described as "a new symbol of Gdańsk", "a new icon" or a "sculptural design". Among many challenges the most spectacular, subjectively, was the construction of tilted walls. Authors took a try to analyse what were the design and construction problems and to what extent could they be solved with codes' help. Both designing and building process was taken into consideration.
Design and experimental investigations of a cylindrical microjet heat exchanger for waste heat recovery systems
- Tomasz Muszyński
2017 APPLIED THERMAL ENGINEERING
Compact heat exchangers have more and more applications in many areas, including the HVAC, food and petrochemical industry. This paper describes the development of heat exchanger technology for waste heat recovery (WHR) from a range of processes. Case-study testing shows that the proposed heat exchanger can successfully enhance heat transfer and recover waste heat in a range of applications making them economically, environmentally and technically feasible. The heat exchanger is based on multiple jet impingement on the cylindrical heat transfer surface. It comprises four coaxial pipes (a supply channel and a return channel for two fluids). The design of the heat is based on available on the market standardized materials. The study of heat transfer in water-water flow allows determining the heat transfer efficiency and the heat transfer coefficient values. Data were collected for the pressure drops in heat exchanger not exceeding 15 kPa, i.e. such as in conventional heat exchangers. Hydraulic characteristics of a prototype heat exchanger were obtained. Experimental values of heat transfer for jet impingement were calculated. Obtained values of heat transfer coefficient were compared with literature correlations. A comparison of results of thermal-flow performance with double pipe heat exchanger indicated that the tested device in low flow rates obtains higher heat transfer coefficients, heat transfer increased 50%. The pressure losses of the novel heat exchanger are lower than standard double pipe heat exchanger.
Design criterion for hydrodynamic vortex separators
- Marlena Gronowska-Szneler
- Jerzy Sawicki
2017 Transactions of the Institute of Fluid-Flow Machinery
Technical objects designing involves determination of geometrical parameters that characterize a given object. When the device is described by the differential equations, an inverse problem brings difficulties, as geometrical values sought condition the solution to the problem. Vortex separators can be designed by the "criterion method'. Firstly, a critical particle is distinguished such that bigger particles are removed from wastewater stream. Next, by comparing values of major forces acting on the critical particle at the most infavourable point within the separator, a force balance is made. The reulting algebraic relation ,presented in the paper, becomes the design criterion.
Design Methodology for Small Passenger Ships On the Example of the Ferryboat Motława 2 Driven by Hybrid Propulsion System
- Paweł Gełesz
- Artur Karczewski
- Janusz Kozak
- Wojciech Litwin
- Łukasz Piątek
2017 Pełny tekst Polish Maritime Research
Dynamic development in practically all elds of science and engineering has not passed over shipbuilding . In last years , engineers got to their use computer soware which makes it possible to perform strength and hydrodynamic calculations as well as to visualize design projects in 3 D space [1-4]. At their disposal they have full spectrum of modern solutions associated with the use of advanced materials and technologies [5-7]. More and more attention is also paid to impact onto the natural environment [8,9]. Every new object must in!uence the environment as low as possible, beginning from building phase through its service life up to nal utilization – such approach is called „green-shipping”. However , not only practical reasons are important . Clients , i.e. ship owners and passengers of ships paid more and more attention to image of !oating units. During decision taking on that from whom a transport service has to be ordered , the most modern ships of an attractive image matching with place and time, are oen taken into consideration. Such situation has become a basis for an idea of working out a concept of a new ferryboat for National Maritime Museum. As the ferry has to navigate in „the heart of the town”, then , apart from strictly marine and engineering aspects , an important factor of its designing is its expected image - a set of signicant meanings and emotions written in architecture language. $e new ferryboat , like its historical predecessors , will never leave urban water routes.
Design of a SiC based triple active bridge ceil for a multi-megawatt DC-DC converter
- Maneiro Jose
- Roland Ryndzionek
- Thomas Lagier
- Piotr Dworakowski
- Cyril Buttay
2017 Pełny tekst
The paper describes the design methodology of a novel Triple Active Bridge cell used as the building block for modular DC-DC converters. The intended application is for Medium Voltage Direct Current grids, such as the DC collector for offshore wind farms. The latest generation of SiC MOSFET semiconductors is utilized to operate in the medium frequency range while optimizing the efficiency. The dimensioning of the main cell components, including semiconductors, transformer and DC capacitors is presented. The cell mechanical integration and cooling are also addressed.
Design of a test bench for determining the general characteristics of an internal combustion engine using a hydraulic power take-off system
- Oskar Wysocki
- Jacek Czyżewicz
- Jacek Kropiwnicki
2017 Pełny tekst
The paper presents a design of an engine test bench, which is used to determine the general characteristics of a truck engine using a power take-off (PTO). PTO drives a hydraulic system that generates a load on the engine at various points in its operation in the power range specified by the hydraulic system. The design allows for stationary and mobile tests with the test bench mounted on the truck, without any modification of examined vehicle. The design assumptions and design constraints are presented. The paper discusses the principle of the test bench and the characteristics calculation method. Hydraulics and control systems have been described as well as the 3D model. Presented engine test bench allows for further investigation on engine characteristics in static and dynamic state, and also on heavy-duty trucks’ fuel efficiency improvement.
Design of modified PID controllers for 3D crane control
- Agata Cellmer
- Bartosz Banach
- Robert Piotrowski
2017
From the control viewpoint, 3D crane is a dynamic, nonlinear and multidimensional electromechanical system. In this paper, five control systems using a set-point weighted PID controllers (modified controllers) are designed. These structures and properties are presented. Optimization process of controllers settings based on integral performance indices is made. Simulation tests of control systems are presented. Comparison of integral indices for control systems using classical PID controllers and modified PID controllers on physical model is presented.
Design of septic tanks placed on cohesive soils
- Andrzej Ambroziak
- Maciej Tomasz Solarczyk
2017
The paper presents a short review of literature with regard to design and erection of the reinforced concrete and concrete tanks. The authors investigated the underground septic tank with of 10 m3 capacity placed on cohesive soils. The authors compared the values of internal forces for soils in drained and undrained conditions with different geotechnical parameters: loamy sand of liquidity index IL = 0.1 and IL = 0.7 and clay with IL =0.1 and IL = 0.7. Moreover, the impact of computational model of the subsoil (the Winkler and elastic half-space models) on the results of internal forces is investigated.
Design of Structure of Tension Leg Platform for 6 MW Offshore Wind Turbine Based On Fem Analysis
- Jędrzej Żywicki
- Paweł Dymarski
- Ewelina Ciba
- Czesław Dymarski
2017 Pełny tekst Polish Maritime Research
The article presents the calculation and design stages of the TLP platform serving as a supporting construction of a 6 MW offshore wind turbine. This platform is designed to anchor at sea at a depth of 60 m. The authors presented the method of parameterization and optimization of the hull geometry. For the two selected geometry variants, the load and motion calculations of the platform subjected to wind, wave and current under 50-year storm conditions were performed. The maximum load on the structure was determined in these extreme storm conditions. For these loads, the MES calculation of the designed platform was performed for the selected variant. Authors have presented a method for calculating maximum wind, wave and current stresses on the structure during the worst storm in the past 50 years. For these loads the MES endurance calculations of the designed platform were made. Based on the results of these calculations, the required structural changes and recalculations have been made in succession to the structural design of the platform, which meets the design requirements and has the required ad hoc strength. The article contains stress analysis in „difficult” nodes of constructions and discusses ways of solving their problems. The work is part of the WIND-TU-PLA project from the NCBR Research Agreement (Agreement No. MARTECII / 1/2014).
DESIGN THINKING ORIENTED METHODOLOGY IN GROUP PROJECT AS A STEP IN THE CDIO APPROACH
- Marcin Gnyba
- Paweł Wierzba
- Adam Mazikowski
- Robert Bogdanowicz
- Marcin Strąkowski
- Michał Sobaszek
2017 Pełny tekst
Recently much scientific research and industrial work is conducted in multidisciplinary teams, where cooperation between specialists from different areas of expertise is required in order to successfully address the challenging goals. Moreover, in start-up small companies the lack of supporting departments calls for additional multidisciplinary, economic and networking skills known as T-shaped personality. Recognizing these shortcomings Group Project was introduced to provide the students with an opportunity to work in start-up-like conditions on development of an IT product according to customers’ needs within limited time and budget. In this paper we present aims and organization of the Group Project, used methodology, analysis of problems that appear during the team work as well as case study of selected student projects.
Detail, Facture, and Colour in the Architecture of Polish Single-Family Houses after 1989
- Marek Sztafrowski
2017 Pełny tekst IOP Conference Series: Materials Science and Engineering
The article presents single-family houses architecture transformations since 1989, with particularly close attention paid to the significance of detail, facture, and colour. The article presents the architecture as an art of designing and building facilities with both use and aesthetic value, an art of shaping space and building forms. Architectural work should correspond to the intended function, technique, economic and aesthetic requirements, thus shaping all elements of human immediate environment, both inside and outside of the building. Architecture of the building is perceived as form, structure, and function, as well as detail, facture, and colour. Facture and colour are created through materials used for external finishes. The solid of the building is noticed first while looking at the building, then the finishes detail such as colour, facture, and detail. Materials for external finishes are commonly selected for their aesthetic value equally with their technical characteristics. The detail was always a characteristic element of style. However, currently the fashion for details can be observed, the fashion for usage of materials for external finishes and inter-connected with that colour and facture. The architecture of Polish single-family houses underwent considerable metamorphosis after system change of 1989 – from destitute in form, devoid in detail and colour socmodernism, to architecture extremely varied in terms of form, utilised structures, materials, and detail.
Detailed experimental investigations on frictional pressure drop of R134a during flow boiling in 5 mm diameter channel: The influence of acceleration pressure drop component =Études expérimentales détaillées sur la chute de pression frictionnelle du R134a lors de l'ébullition en écoulement dans un canal de 5 mm de diamètre : influence de la composante d'accélération de la chute de pression
- Tomasz Muszyński
- Rafał Andrzejczyk
- Carlos Alberto Dorao
2017 INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
This article presents detailed two-phase diabatic pressure drop data for refrigerant R134a at a saturation pressure of 5.5 bar corresponding to the saturation temperature of 19.4 °C. Study cases have been set for a mass flux varying from 100 to 500 kg m−2 s−1. The obtained data are used as a validation of the void fraction literature models, a set of graphs shows comparisons, for a representative set of experimental conditions, of the two-phase frictional pressure gradients for the adiabatic and diabatic flow. Verification of the acceleration pressure drop predictions for two-phase adiabatic flow showed that all correlations predict that over 60% of experimental data fit in the range of ±30%. The model proposed in this article predicts 63% of presented data within 10% error, and 96% of the data are predicted within 30% error.
Detection of apple in orange juice using ultra-fast gas chromatography
- Anna Różańska
- Tomasz Dymerski
- Jacek Namieśnik
2017
The determination of authenticity is an increasingly important issue for food quality and safety. The use of an electronic nose based on ultra-fast gas chromatography technique ensures rapid analysis of the volatile compounds from food products. Due to the fact that this technique enables chemical profiling of agricultural products, it can be an effective tool for authentication when combined with chemometrics. In this article presented is a methodology for classifying NFC (Not From Concentrate) juices. Samples tested were: pure orange juice, pure apple juice, as well as mixtures of these juices with known percentage of base juices. Classification of juice samples was carried out using chemometric method - Principal Component Analysis (PCA). The ultra-fast GC technique coupled with chemometrics allowed to distinguish juice samples containing only 0.5% of impurities. Developed methology is a promising analytical method for the ensurance of quality and authenticity of juices.
Detection of immunological agent by optical fiber sensor: preliminary study
- Monika Kosowska
- Michał Wąsowicz
- Marek Kulka
- Paweł Wierzba
- Daria Majchrowicz
2017 Proceedings of SPIE
The objective of this study is the application of optical methods for detection of immunological agent concentration. As the agent we used the Cyclaid, produced by Apotex Inc. In this article we investigated different Cyclaid concentrations in water. We used a Fabry-Pérot interferometer working in a reflective mode, the measurements were performed with source with central wavelength λ = 1550 nm. The preliminary investigation have shown that the Fabry-Pérot interferometer can be used to study the Cyclaid concentration.
Detection of impulsive disturbances in archive audio signals
- Marcin Ciołek
- Maciej Niedźwiecki
2017 Pełny tekst
In this paper the problem of detection of impulsive disturbances in archive audio signals is considered. It is shown that semi-causal/noncausal solutions based on joint evaluation of signal prediction errors and leave-one-out signal interpolation errors, allow one to noticeably improve detection results compared to the prediction-only based solutions. The proposed approaches are evaluated on a set of clean audio signals contaminated with real click waveforms extracted from silent parts of old gramophone recordings.
Detection of inter-turn faults in transformer winding using the capacitor discharge method
- Michał Michna
- Andrzej Wilk
- Michał Ziółko
- Marek Wołoszyk
- Leon Swędrowski
- Piotr Szwangruber
2017 Pełny tekst Open Physics
The paper presents results of an analysis of inter-turn fault effects on the voltage and current waveforms of a capacitor discharge through transformer windings. The research was conducted in the frame of the Facility of Antiproton and Ion Research project which goal is to build a new international accelerator facility that utilizes superconducting magnets. For the sake of electrical quality assurance of the superconducting magnet circuits, a measurement and diagnostic system is currently under development at Gdansk University of Technology (GUT). Appropriate measurements and simulations of the special transformer system were performed to verify the proposed diagnostic method. In order to take into account the nonlinearity and hysteresis of the magnetic yoke, a novel mathematical model of the transformer was developed. A special test bench was constructed to emulate the inter-turn faults within transformer windings.
Detection of the Incoming Sound Direction Employing MEMS Microphones and the DSP
- Grzegorz Szwoch
- Józef Kotus
2017
A 3D acoustic vector sensor based on MEMS microphones and its application to road traffic monitoring is presented in the paper. The sensor is constructed from three pairs of digital MEMS microphones, mounted on the orthogonal axes. Signals obtained from the microphones are used to compute sound intensity vectors in each direction. With this data, it is possible to compute the horizontal and vertical angle of an incoming sound. The algorithm was implemented on a low-cost, fixed point TMS320C5535 digital signal processor. The microphone signals are acquired via I2S buses, then the algorithm computes the acoustic pressure, particle velocity and sound intensity components, which are then used to calculate the azimuth and elevation of a sound source. The detection results are exposed via the USB interface. The intensity values are computed in overlapping frames in order to improve the signal-to-noise ratio. In the experimental setup, readouts with a frequency of c.a. 70 Hz, frequency range up to c.a. 9 kHz and the angular resolution of 1 degree, were obtained. Validation of the sensor was performed in an anechoic chamber using a test source with known direction. A comparison of the tested system with a commercial sound intensity probe was also made. Additionally, some preliminary tests in real world conditions were also performed. The obtained results prove that the proposed sensor and the algorithm provide high accuracy of detection of the incoming sound direction, comparable to a commercial device. Therefore, the sensor and the DSP algorithm form a low-cost system that may be used e.g. for acoustic monitoring of traffic.
Detection system for optical coherence tomography: Czerny-Turner spectrometer
- Aleksandra MARIA Kamińska
2017 Pełny tekst
Research methods based on spectral analysis have powerful impact on development in many field of science. Signal spectrum can be a source of useful and important data. It enables to obtain information about physical and chemical properties of tested materials. This paper has been devoted to describe optical design for high resolution spectrometer, which is significant element of optical coherence tomography (OCT) systems. Designed spectrometer is working in visible range (450-830 nm). Czerny-Turner configuration enables to correcting astigmatism and coma aberration over full bandwidth. Moreover, spectrometer has uncomplicated construction. Merely, two mirrors and diffraction gratings allows to design low – cost spectrometer with satisfying optical properties. Spectrum detection has been realized using CMOS line scan sensors with 6144 pixels. It provides high speed and resolution of the system.
Detekcja materiałów przy użyciu organicznych tranzystorów polowych
- Małgorzata Franz
2017 Pełny tekst
W ciągu ostatnich dwudziestu lat nastąpił rozwój elektroniki organicznej, która stała się ważnym obszarem badań naukowych i technologicznych. Organiczne ogniwa fotowoltaiczne i organiczne diody elektroluminescencyjne zostały wykorzystane w urządzeniach komercyjnych, a jednym z najbardziej obiecujących zastosowań dla organicznych tranzystorów polowych są czujniki chemiczne i biologiczne. Postęp w tej dziedzinie jest tematem tego opracowania. W rozdziale przedstawiono zasadę działania, podstawowe parametry oraz charakterystyki prądowo-napięciowe organicznych tranzystorów polowych (OFET) oraz możliwości wykorzystania tych urządzeń jako czujników substancji gazowych i ciekłych. Przedstawiono zasadę działania czujników wykorzystujących OFET, a także potencjalne możliwości aplikacyjne tych urządzeń.