2016 - Publications Repository - Gdańsk University of Technology

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Publications from the year 2016

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Expedited Simulation-Driven Multi-Objective Design Optimization of Quasi-Isotropic Dielectric Resonator Antenna
- Adrian Bekasiewicz
- Sławomir Kozieł
- Włodzimierz Zieniutycz
- Leifur Leifsson
2016
Majority of practical engineering design problems require simultaneous handling of several criteria. Although many of design tasks can be turned into single-objective problems using sufficient formulations, in some situations, acquiring comprehensive knowledge about possible trade-offs between conflicting objectives may be necessary. This calls for multi-objective optimization that aims at identifying a set of alternative, Pareto-optimal designs. The most popular solution approaches to genuine multi-objective optimization include population-based metaheuristics. Unfortunately, such methods are not practical for problems involving expensive computational models, particularly for antenna engineering, where reliable design requires CPU-intensive electromagnetic (EM) analysis. In this work, we discuss two methodologies for expedited multi-objective design optimization of a six-parameter dielectric resonator antenna (DRA) with respect to three design criteria. The considered solution approaches rely on surrogate-based optimization (SBO) paradigm, where the design speedup is obtained by shifting the optimization burden into a cheap replacement model referred to as a surrogate. The latter is utilized for generating the initial approximation of the Pareto front representation as well as further refinement of the initially obtained Pareto-optimal solutions.
Expedited two-objective dimension scaling of compact microwave passives using surrogate models
- Sławomir Kozieł
- Adrian Bekasiewicz
- Quingsha. S. Cheng
2016
Geometry scaling of compact microwave structures is a challenging problem because of complex relationships between the physical dimensions and electrical characteristics, mostly caused by considerable cross-couplings in densely arranged layouts. Here, a procedure for expedited dimension scaling of compact microwave couplers with respect to two independent criteria has been presented. Our approach involves inverse surrogate models and permits low-cost re-design of the coupler structure for a required operating frequency and power split ratio. It is illustrated using a folded microstrip rat-race coupler.
Experience-Oriented Knowledge Management for Internet of Things
- Haoxi Zhang
- Cesar Sanin
- Edward Szczerbicki
2016
In this paper, we propose a novel approach for knowledge management in Internet of Things. By utilizing Decisional DNA and deep learning technologies, our approach enables Internet of Things of experiential knowledge discovery, representation, reuse, and sharing among each other. Rather than using traditional machine learning and knowledge discovery methods, this approach focuses on capturing domain’s decisional events via Decisional DNA, and abstracting knowledge through deep learning process based on captured events data. The Decisional DNA is a flexible, domain-independent, and standard experiential knowledge repository solution that allows knowledge to be represented, reused, and easily shared. The main features, architecture, and an initial experiment of this approach are introduced. The presented conceptual approach demonstrates how knowledge can be discovered through its domain’s experiences, and stored and shared as Decisional DNA.
Experiencing the Ocean the Paths for Urban Development of Sao Pedro do Estoril in Lisbon Metropolitan Area
- Lucyna Nyka
- Justyna Borucka
- Katarzyna Urbanowicz
2016
The areas of Cascais Municipality, one of the richest Municipalities in Portugal, located west to Lisbon, at the estuary of Tagus and the Atlantic Ocean coast is popular tourist destination. With its unique landscape it became the most attractive venue for spending vacations, for sport activities and leisure. It arose around the coastal town of Cascais, the former fishing village famous as a refuge for notables and claiming to be the most attractive part of Portuguese coast. With time this scenic resort became increasingly popular among inhabitants of the metropolitan Lisbon and well known as a fashionable nightspot and bar destination. In addition to bourgeoning nightlife, surfing competitions of national and international pedigree are held here. São Pedro do Estoril used to be a small village in Municipality of Cascais located on the Estoril Coast on the way between Cascais and Lisbon. Today, filled with summer houses and suburban villas it forms a part of a cosmopolitan suburb. The village stays in the shadow of well known Cascais and is often perceived as transit area to this main tourist destination. In this situation several new questions appear, as what to re-define in the space organization of this settlement so it can be perceived as an attractive place to live and visit. The article discuses those issues based on the student project realized during EWWUD 2014 workshop and located on the waterfront area with special emphasis on the beach of São Pedro do Estoril. The area has a unique geography which makes its beauty stand out. Despite the scenic beauty of the place after analyzing the potentials and problems of the site several issues were defined. It was the encounter of the water and earth that led to the origins of São Pedro do Estoril and was a forming factor throughout the long history of this settlement. Today as well, it gives opportunity for its future development as a metropolitan settlement. In the process of forming the project proposal the important questions were posted as how to expose the natural beauty of the village originating from the presence of the ocean and how to enhance its unique characteristics making it visible to the inhabitants and newcomers. The process of re-introduction of the ocean into the village will not only contribute to the quality of living in São Pedro do Estoril but also create a proper and sustainable reference for further evolution of this settlement in a future to come.
Experienta jako pomost pomiędzy Kołem Naukowym Qualiteam UG a Klubem Pomorskiej Nagrody Jakości
- Anna Wendt
2016
POMORSKIEJ NAGRODY JAKOŚCI Na przestrzeniu kilku ostatnich lat zauważono zwiększoną aktywność studentów w pracach kół naukowych. Zainteresowanie działalnością w organizacjach studenckich wynika z możliwości powiększania swojego indywidualnego dorobku naukowego a także wiedzy i umiejętności praktycznych. W niniejszym artykule zostanie krótko ukazana działalność Koła Naukowego QualiTeam funkcjonującego przy Zakładzie Zarządzania jakością Uniwersytetu Gdańskiego a także szerzej przedstawione studium przypadku nowego projektu Koła Akademia Jakości Experientia, realizowanego w ramach inicjatywy Pomorskiej Nagrody Jakości, we współpracy z Naczelną Organizacją Techniczną - NOT Gdańsk. Opracowanie zawiera krótki opis Konkursu oraz jego modelu doskonałości. Przedstawiony został także główny odbiorca projektu - Klub Pomorskiej Nagrody Jakości, zrzeszający laureatów Konkursu, którzy z dużym zainteresowaniem przyjęli projekt polegający na cyklu szkoleń warsztatowych prowadzonych przez Koło Naukowe, na temat wybranych metod i narzędzi zarządzania jakością. Podsumowaniem niniejszego artykułu będzie ukazanie korzyści wynikających z integracji środowiska studentów i praktyków poprzez wyżej wymienione przedsięwzięcie.
Experimental analysis of chip removing system in circular sawing machine
- Jacek Barański
- Marcin Jewartowski
- Jan Wajs
- Tomasz Pikała
2016 Full text Trieskove a Beztrieskove Obrabanie Dreva
Paper presents analysis of the process of removing the wood chips generated during the cutting of the material on the circular sawing machine. The attention is focused on the upper cover of the chip removing system. Within the framework of the work a systematic experimental study of pressure distribution in the cover during operation of the selected rotational speed of saw blade with a diameter of 300 mm and 450 mm was carried out. Analysis of the results allowed to predict the areas with insufficient vacuum pressure hindering the organized transport of chips. In addition the effect of a 20% change in the fan speed on the pressure range in these areas has been investigated. The obtained results will be used by the authors in the process of optimizing the shape of the cover to improve the process of chip extraction. It will also be helpful in interpreting the results of numerical analyzes conducted in parallel.
Experimental and Computational Analysis of the Ship Propeller in Open Water Conditions for Inclined Flow
- Judyta Felicjancik
- Przemysław Król
- Bugalski Tomasz
2016
The paper presents the results of computational analyses simulating the open water tests of ship propeller in inclined flow. The results of computations are compared with the results of corresponding experimental analyses carried out in the towing tank of Ship Design and Research Centre (CTO S.A.). The object of the research was the model propeller identified as CP469. The aim of the study was to validate the results of numerical simulations performed at model scale. The computational analyses were carried out at model scale with the use of two computational models: Reynolds-Averaged Navier-Stokes model implemented in Star CCM+ software and lifting surface model, implemented in the in-house code. The work is part of a series of activities aimed at the development of advanced numerical methods supporting the design process of ship propellers with taking into account their actual operating conditions.
Experimental and Numerical Analysis of Air Trapping in a Porous Medium with Coarse Textured Inclusions
- Paulina Szymańska
- Witold Tisler
- Adam Szymkiewicz
- Cindi Schutz
- Insa Neuweiler
- Rainer Helmig
2016 Full text Acta Geophysica
The paper presents a 2D upward infiltration experiment performed on a model porous medium consisting of fine sand background with two inclusions made of coarser sands. The purpose of the experiment was to investigate the effects of structural air trapping, which occurs during infiltration as a result of heterogeneous material structure. The experiment shows that a significant amount of air becomes trapped in each of the inclusions. Numerical simulations were carried out using the two-phase water-air flow model and the Richards equation. The experimental results can be reproduced with good accuracy only using a two-phase flow model, which accounts for both structural and pore-scale trapping. On the other hand, the Richards equation was not able to represent the structural trapping caused by material heterogeneity.
Experimental and numerical analysis of wave propagation in ground anchors
- Beata Zima
- Magdalena Rucka
2016
The article focuses on wave propagation phenomenon in ground anchors. The main aim of the investigation is the non-destructive diagnostics and the assessment of the state of ground anchors, using the guided wave propagation method. Laboratory models of anchors with different lengths of the anchor body were tested and voltage signals of propagating waves were registered at several locations. For all tested specimens corresponding numerical models were created. Results of calculations were compared with experimental signals.
Experimental and numerical evaluation of mechanical behaviour of composite structural insulated wall panels under edgewise compression
- Łukasz Smakosz
- Ireneusz Kreja
2016
A composite structural insulated sandwich panel (CSIP) is a quite novel approach to the idea of sandwich structures. A series of natural-scale experimental test is required each time a change in panel’s geometry is planned and a reliable computational tool is required to precede actual laboratory testing with virtual simulations. An attempt of creating such a tool has been made with use of a commercial FEM code ABAQUS, in order to predict behaviour of a specific kind of CSIPs with magnesium-oxide board facings and expanded polystyrene core. Results obtained from simulations taking into account geometrical nonlinearity as well as material nonlinearity of both core and facing materials are presented and compared with experimental data from natural-scale edgewise compression tests of wall CSIPs.
Experimental and numerical investigations for GPR evaluation of reinforced concrete footbridge
- Jacek Lachowicz
- Magdalena Rucka
2016
The GPR method has increasingly found application in non-destructive testing of reinforced concrete structures. This paper presents the new approach of modelling of the electromagnetic wave propagation for reinforced concrete structures with a complex system of the reinforcement. Simulations of the GPR field were performed on a three-dimensional model of a footbridge using the FDTD method. Numerical maps were compared with results of in-situ surveys. A particular attention was paid to analyze the influence of the location of the transverse reinforcement on resulting GPR radargrams.
Experimental and numerical study on polymer element used for reduction of temporary steel grandstand vibrations
- Natalia Lasowicz
- Robert Jankowski
2016
The purpose of the paper is to analyse the effectiveness of a polymer damper in reduction of a temporary steel grandstand vibrations through the experimental and numerical study. The damper considered in the investigation is constructed out of two L-shape steel members bonded with polymer mass of high damping properties. The element has been installed as a diagonal one at the back part of the structure. The method has been compared with the typical solution of strengthening the grandstand with the diagonal stiffener of tubular cross section. Dynamic parameters of a temporary steel grandstand have been determined and behaviour of the structure under crowd load has been obtained. The results of the study clearly show that the response of a temporary steel grandstand equipped with a diagonal damper as well as with the diagonal stiffener is substantially different.
Experimental and Quantum Chemical Evaluation of 8-Hydroxyquinoline as a Corrosion Inhibitor for Copper in 0.1 M HCl
- Husnu Gerengi
- Michał Mielniczek
- Gökhan Gece
- Moses Solomon
2016 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
The corrosion inhibition properties of 8-hydroxyquinoline (8-HQ) in 0.1 M HCl for copper have been investigated by using experimental (electrochemical impedance spectroscopy (EIS), dynamic electrochemical impedance spectroscopy (DEIS), and potentiodynamic polarization) and theoretical methods complemented by surface morphological examination with the aid of scanning electron microscopy (SEM) and electron dispersive X-ray spectroscopy (EDAX). Results obtained from all of these applied techniques are in agreement and demonstrate that 8-HQ inhibited copper corrosion in 0.1 M HCl solution significantly and the inhibition efficiency varies directly with 8-HQ concentration. Potentiodynamic polarization results show that 8-HQ behaved like a cathodic-type inhibitor in the studied system. EDAX results reveal that 8-HQ is most stable and effective at 10 h of immersion time. Inhibition of Cu corrosion by 8-HQ is due to electrostatic interaction between the Cu surface and salt of 8-HQ according to the ΔGads0 value and FTIR results. EHOMO, ELUMO, and ΔE values support the proposed physisorption mechanism. SEM and EDAX results confirm the adsorption of 8-HQ molecules on a Cu surface.
Experimental Comparison of Straight Lines and Polynomial Interpolation Modeling Methods in Ship Evolutionary Trajectory Planning Problem
- Roman Śmierzchalski
- Piotr Kolendo
2016
Paper presents the application of evolutionary algorithms and polynomial interpolation in ship evolutionary trajectory planning method and its comparison to classic approach, where trajectory is modeled by straight lines. Evolutionary algorithms are group of methods that allows\ to find a collision free trajectory in real time, while polynomial interpolation allows to model smooth trajectory, which keeps continuity of velocity and acceleration values along path in opposition to straight lines approach. Paper presents the experimental researches for several collision situations at sea with application of trajectory modeled by straight lines and polynomial interpolation.
Experimental Designs of Mass Customized Passive Single-family Houses - Prospects and Limitations
- Maria Helenowska-Peschke
2016 Full text Procedia Engineering
Abstract The article deals with case studies of selected architectural designs of the past fifteen years the authors of which intended to rethink both the typology and the means of constructing single family houses. The analysis covers contemporary design issues such as variation, curvilinearity, customization, digital manufacturing and ecological concerns. The purpose behind the research was to establish in what way new design and production methods may contribute in creating customized passive houses for middle class families in Poland.
Experimental investigation of domestic gas boiler fitted with ORC module
- Jan Wajs
- Dariusz Mikielewicz
- Michał Bajor
2016
In the paper the prototype of innovative domestic cogenerative ORC system, consisting of a conventional gas boiler and a small size axial vapour microturbines (in-house designed for ORC and the commercially available for Rankine cycle (RC)), evaporator and condenser were scrutinised. In the course of study the fluid working temperatures, rates of heat, electricity generation and efficiency of the whole system were obtained. The tested system could produce electricity in the amount of 1 kWe. Some preliminary tests were started with water as working fluid and the results for that case are also presented. The investigations showed that domestic gas boiler was able to provide the saturated/superheated ethanol vapour (in the ORC system) and steam (in the RC system) as working fluids.
Experimental investigation of domestic micro-CHP based on the gas boiler fitted with ORC module
- Jan Wajs
- Dariusz Mikielewicz
- Michał Bajor
- Zbigniew Kneba
2016 Full text Archives of Thermodynamics
The results of investigations conducted on the prototype of vapour driven micro-CHP unit integrated with a gas boiler are presented. The system enables cogeneration of heat and electric energy to cover the energy demand of household. The idea of such system is to produce electricity for own demand or for selling it to the electric grid – in such situation the system user will became the prosumer. A typical commercial gas boiler, additionally equipped with an organic Rankine cycle (ORC) module based on environmentally acceptable working fluid can be regarded as future generation unit. In the paper the prototype of innovative domestic cogenerative ORC system, consisting of a conventional gas boiler and a small size axial vapour microturbines (in-house designed for ORC and the commercially available for Rankine cycle (RC)), evaporator and condenser were scrutinised. In the course of study the fluid working temperatures, rates of heat, electricity generation and efficiency of the whole system were obtained. The tested system could produce electricity in the amount of 1 kWe. Some preliminary tests were started with water as working fluid and the results for that case are also presented. The investigations showed that domestic gas boiler was able to provide the saturated/superheated ethanol vapour (in the ORC system) and steam (in the RC system) as working fluids.
Experimental investigation of forced convection of water-Al2O3 nanofluids inside horizontal tubes,
- Janusz Cieśliński
- Przemysław Kozak
2016
In this paper, forced convection of water–Al2O3 nanofluids inside horizontal copper tube is studied experimentally. Experiments were conducted for three, i.e. 0.1%, 1% and 5% nanoparticle mass concentrations under transition and turbulent flow regimes. Average heat transfer coefficients and pressure drop values were determined and compared to distilled water. Enhancement of heat transfer for lower nanoparticle concentration and deterioration of heat transfer for higher nanoparticle concentration has been recorded. Substantial increase of pressure drop for nanofluids compared to distilled water has been observed.
Experimental investigation of free convection of glycol-Al2O3 nanofluid from horizontal tube
- Janusz Cieśliński
- Sławomir Smoleń
- Dorota Sawicka
2016
Nanofluids came to be seen as a new generation of coolants, both in single- and two phase systems. Furthermore, nanofluids or nanocomposites may be used as a media in a thermal energy storage (TES) in such systems as sensible heat storage (SHS) and phase change materials (PCM). In the SHS systems the dominating mechanism of the heat transfer is natural convection. However, in the literature only a few investigations of free convection of nanofluids have been discussed. This paper presents preliminary results of the experimental investigation of natural convection heat transfer of glycol-Al2O3 nanofluid from horizontal tube.
EXPERIMENTAL INVESTIGATION OF FREE CONVECTION OF GLYCOL-Al2O3 NANOFLUID FROM HORIZONTAL TUBE
- Janusz Cieśliński
- Sławomir Smoleń
- Dorota Sawicka
2016 Full text Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
Nanofluids came to be seen as a new generation of coolants, both in single- and two phase systems. Furthermore, nanofluids or nanocomposites may be used as a media in a thermal energy storage (TES) in such systems as sensible heat storage (SHS) and phase change materials (PCM). In the SHS systems the dominating mechanism of the heat transfer is natural convection. However, in the literature only a few investigations of free convection of nanofluids have been discussed. This paper presents preliminary results of the experimental investigation of natural convection heat transfer of glycol-Al2O3 nanofluid from horizontal tube.