2016 - Repozytorium publikacji - Politechnika Gdańska

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Publikacje z roku 2016

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ANALYSIS OF EFFECTIVENESS AND COMPUTATIONAL COMPLEXITY OF TREND REMOVAL METHODS
- Łukasz Lentka
- Janusz Smulko
2016 Pełny tekst Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
The paper presents a method of processing measurement data due to remove slowly varying component of the trend occurring in the recorded waveforms. Comparison of computational complexity and trend removal efficiency between some commonly used methods is presented. The impact of these procedures on probability distribution and power spectral density is shown. Effectiveness and computational complexity of these methods depend essentially on nature of the removed trend. This paper describes several procedures: Moving Average Removal (MAR), fitting a polynomial of degree appropriate to the analyzed data, Empirical Mode Decomposition (EMD).
Analysis of High Resolution Clouds of Points as a Source of Biometric Data
- Katarzyna Bobkowska
- Artur Janowski
- Marek Przyborski
- Jakub Szulwic
2016
The article presents the analysis devoted to human face data obtained by means of precise photographic scanners. Collected point clouds were used to make high precision meshes of human face. The essence of these studies is the comparison of relative features as well as the comparison of absolute models which require as precisely as possible matching of face models. The article focuses on the analysis of various parts of the human face, relative to that you can execute matching of models using the ICP algorithm. In order to visualize the accuracy of registration process of selected models under various assumptions, the map of deviations between the models has been created. The authors propose a new method of biometrics analysis which is based on the Mathematical Theory of Evidence. This method aims to identify people.
Analysis of Historic Brick Walls' Strengthening Methods
- Monika Zielińska
- Joanna Misiewicz
2016 Pełny tekst Procedia Engineering
Analysis of the behavior of historical brick walls is difficult and complicated. However, computer calculations are being increasingly used in the evaluation of cultural heritage buildings and some of their elements. The aim of this paper is to analyze the historic brick walls reinforcement. Different methods of strengthening are compared and discussed. Numerical analysis, based on finite element method, was conducted on the assumption of three methods of wall strengthening: using the steel element (I-beam), overall relaying and partial relaying the wall with new bricks. Analysis of the wall without any intervention was made for comparison. Characteristics of strengthening of historical brick walls are described in the paper. The information should allow for a better understanding of the behaviour of brick wall in this research. Calculations were performed in Abaqus software, for the garrison arrest's prison yard at Bohaterów Monte Cassino Street in Olsztyn in Poland. In this object, prison's yard will be covered with the glazed roofing, resting on the perimeter walls. This is the reason why load transmitted to the wall is increased and why strengthening is needed. Survey allows to calculate displacements and the results are used to select the most appropriate methods of strengthening brick wall in this object. A comparison analysis has been performed and possible directions for further research in this field have been indicated.
Analysis of hydrodynamic pressure fields of motorboats and pontoons in shallow water
- Jan Bielański
2016 Pełny tekst HYDROACOUSTICS
The article presents the results of calculations of the pressure fields generated by a motorboat at the bottom of a shallow sea. Calculations were made using the boundary elements method (BEM), arranged on the surface of the boat and the bottom of the sea. This method is described in [3], and applied on a free surface linearized boundary condition. Results for four different lengths of motorboats, from 2.85 m to 9.5 m, sea depth from 1 m to 10 m, are presented in the form of a surface, approximated by a polynomial function whose coefficients are given. These functional relations allow one to calculate the maximum and minimum hydrodynamic pressure generated by the motor boat length, in the range as above, and the sea depth to about 10 m when flying at speeds of up to 20 m / s. Given functional dependencies can be used, in the field of security and anti-terrorism defences, and can serve to identify the type and size of speedboats, up to about 10 meters and a displacement of about 8 tons.
Analysis of Measurement Errors in Rail Vehicles’ Pantograph Inspection System
- Sławomir Judek
- Leszek Jarzębowicz
2016 Pełny tekst Elektronika Ir Elektrotechnika
The paper presents an approach to evaluation of height measurement errors in laser scanning inspection system. The system, consisting of a laser line generator and a specialized camera, is dedicated to diagnosing carbon contact strips of railway vehicles’ pantographs. While height measurement resolution is easily computable based on system parameters, determining the measurement error is troublesome due to numerous impacts. As width-to-height ratio of the scanned object is very high, typical patterns applied in references for error determination cannot be used. A set of real-case contact strips have been selected and used as patterns for determining scanning system errors. Both peak and RMS errors have been quantified to evaluate accuracy of wear estimation and defect identification, respectively.
Analysis of pesticide residue in fruits and vegetables using analytical analytical protocol based on application of QuEChERS technique and GC-ECD system
- Jolanta Stocka
- Marek Biziuk
- Jacek Namieśnik
2016 International Journal of Global Environmental Issues
QuEChERS sample preparation method was used for the determination of 10 pesticides and their metabolites in fruits (apple, grape) and vegetables (tomato, paprika), coupled to gas chromatography with electron capture detector (GC-ECD). The experimental parameters including amount of the sample, types of solvents, extraction time and types of sorbent at the purification stage were optimized. The GC-ECD method was validated in terms of linearity, selectivity and recovery. The limits of detection for all investigated analyte ranged from 0.003 to 0.011 mg kg-1 and limits of quantification ranged from 0.009 to 0.03 mg kg-1. The mean recoveries from four matrices for development method ranged from 70 to 120 %, with relative standard deviations in the range of 3.9 to 7.2 % for all ten test compounds. The method is demonstrated to be convenient and reliable for the routine monitoring of pesticides and its metabolites in fruits and vegetables. QuEChERS approach takes advantages of the wide analytical scope and high degree of selectivity and sensitivity are simple, rapid and requires low solvent consumption. Which, in the era of green chemistry, represents a significant advantage. Therefore, this technology is of great interest because of its favourable toxicological, environment and economic aspects.
Analysis of possible application of high-temperature nuclear reactors to contemporary large-output steam power plants on ships
- Tomasz Kowalczyk
- Jerzy Głuch
- Paweł Ziółkowski
2016 Pełny tekst Polish Maritime Research
This paper is aimed at analysis of possible application of helium to cooling high-temperature nuclear reactor to be used for generating steam in contemporary ship steam-turbine power plants of a large output with taking into account in particular variable operational parameters. In the first part of the paper types of contemporary ship power plants are presented. Features of today applied PWR reactors and proposed HTR reactors are discussed. Next, issues of load variability of the ship nuclear power plants , features of the proposed thermal cycles and results of their thermodynamic calculations in variable operational conditions, are presented.
Analysis of resistive and inductive heating of railway turnouts
- Mirosław Wołoszyn
- Kazimierz Jakubiuk
- Mateusz Flis
2016 Pełny tekst Przegląd Elektrotechniczny
Elektryczne ogrzewanie rozjazdów kolejowych jest istotnym problemem technicznym i ekonomicznym. Z tych względów potrzebne są badania w celu optymalizacji systemu ogrzewania rozjazdów kolejowych. W artykule przedstawiono analizę porównawczą strat energii podczas ogrzewania rozjazdów kolejowych z wykorzystaniem dwóch różnych metod. Analiza ogrzewania rozjazdów przeprowadzono w programie ANSYS.(Analiza oporowego i indukcyjnego nagrzewania rozjazdów kolejowych)
Analysis of Signalized Intersections in the Context of Pedestrian Traffic
- Jacek Oskarbski
- Lucyna Gumińska
- Michał Miszewski
- Izabela Oskarbska
2016 Transportation Research Procedia
Gdynia is a city in the Pomeranian Voivod e ship of Poland with a population of about 250,000. It faces a growing motorization rate th at needs to be addressed. Car ownership in Gdynia now exceed s 500 vehicles per 1000 residents. Travel by public transport is decreasing and the rate of walking and cycling remains low. It is necessary to reverse these negative trends by implementing solu tions based on walking, cycling, and smart mobility. On the basis of one selected intersection, the article presents a research m ethod which aims at finding solutions that shoul d improve pedestrian walking and safety conditions at sig nalized intersections in th e city center area. According to the statistical research of traffic incidents, pedestrian behavior, and simulations run usin g the VISSIM software, an attempt was made to find solutions that wi ll result in improvement of traffic conditions and pedestrian saf ety at signalized intersections. Thes e analyses do not exhaust the test issues but are only a prelude to further research that will be run, a mong others, within the FLOW Project framework (HORIZON 2020) .
Analysis of sloping brace stiffness influence on stability and load bearing capacity of a truss
- Marcin Krajewski
- Piotr Iwicki
- Natalia Dorożyńska
- Agnieszka Łukowicz
2016
The paper is focused on the numerical study of stability and load bearing capacity of a truss with side elastic braces. The structure is made in reality. The rotational and sliding brace stiffnesses were taken into account. Linear buckling analysis and non-linear static analysis with geometric and material nonlinearity were performed for the beam and shell model of the truss with respect to the angle of sloping braces. As a result the buckling load and limit load in relation to the truss bracing stiffness was obtained. The threshold bracing condition necessary to provide maximum buckling resistance of the structure was proposed. The truss bearing capacity due to Eurocode requirements was calculated.
Analysis of soundscape recordings in close proximity to the road in changeable wather conditions
- Karolina Marciniuk
- Adam Kurowski
- Bożena Kostek
2016
The acoustic vehicle sensing is the least invasive type of traffic detection. Also, acoustic-based vehicle detection technology is insensitive to precipitation and can operate in low light level. Therefore, this kind of method may be used for automatic detection of the vehicle passage events. It can also be employed for measurements of a vehicle speed and the vehicle assignment to the particular category. In this paper the results of the experiment that evaluate the impact of the wet pavement on the noise pattern analyzed in frequency domain are presented. The observations take place in a few locations in different weather conditions. Video recordings were also made for a better speed determination.
Analysis of The Behavior of Foundations of Historical Buildings
- Jarosław Przewłócki
- Monika Zielińska
2016 Pełny tekst Procedia Engineering
The article is devoted to the analysis of the behavior of the foundations of historic buildings. Some basic aspects of foundation engineering are discussed, with an emphasis placed on its development, applied techniques, and materials. Several different approaches and methods for the analysis of foundations of historical buildings are presented. A particular analysis has been focused on an example of a typical stone foundation from the sixteenth century. First, the calculations have been performed using the finite element method, then the bearing capacity and the settlement analysis has been determined according to EC-7. Next, the bearing capacity has been evaluated using simplified analysis. A settlement of the foundation has been also estimated using Kerisel’s proposal. The information should allow for a better understanding of the behaviour of foundations discussed in this research, and especially of methods of their analysis. A comparison analysis has been performed and possible directions for further research in this field have been indicated.
Analysis of the chemical composition of sediments
- Jacek Ryl
2016
Analysis of sediments and corrosion products was carried out, including microscoping and spectroscopic measurements with SEM/EDX
ANALYSIS OF THE IMPACT OF MASS FLOW EXTRACTION ON THE CHANGE OF PARAMETERS IN A LABYRINTH SEAL USING THE STODOLA METHOD
- Paweł Bogumił Kaszowski
- Marek Dzida
2016 Pełny tekst Journal of Polish CIMEEAC
Labyrinth seals are an important element of a steam turbine set design. The use of diagnostic extraction makes it possible to control the operation of a seal by providing information on the thermodynamic parameters along the length of the seal. Diagnostic extraction has a considerable impact on the change of the parameters, the amount of the extracted mass. This article describes the dependence of pressure in the clearance downstream of the extraction and in the chamber in which the extraction point is located, on the amount of the extracted steam. Relation between pressure and nominal seal clearance is discussed, which enables the control of the seal operation. The calculations of the seal operation parameters were performed using a method proposed by Stodola.
ANALYSIS OF THE IMPACT OF MASS FLOW EXTRACTION ON THE CHANGE OF PARAMETERS IN A LABYRINTH SEAL USING THE STODOLA METHOD
- Paweł Bogumił Kaszowski
- Marek Dzida
2016
Labyrinth seals are an important element of a steam turbine set design. The use of diagnostic extraction makes it possible to control the operation of a seal by providing information on the thermodynamic parameters along the length of the seal. Diagnostic extraction has a considerable impact on the change of the parameters, the amount of the extracted mass. This article describes the dependence of pressure in the clearance downstream of the extraction and in the chamber in which the extraction point is located, on the amount of the extracted steam. Relation between pressure and nominal seal clearance is discussed, which enables the control of the seal operation. The calculations of the seal operation parameters were performed using a method proposed by Stodola.
ANALYSIS OF THE IMPACT OF THE PLANNED SEWAGE DISCHARGE FROM THE ‘NORTH’ POWER PLANT ON THE VISTULA WATER QUALITY
- Piotr Zima
- Paweł Wielgat
2016
The paper presents results of analysis of the industrial sewage discharge impact from the ‘North’ Power Plant on the Vistula water quality around 45+330 of the river kilometer. For the analysis, the two-dimensional models of flow, impurities and temperature transport were used. Hydrological conditions of the analyzed section of the river, characteristic flows and bathymetry of the riverbed in the first instance were defined. the calculation of the velocity distribution at steady flow conditions were carried out for the characteristic flows as the least favorable due to the discharge of pollutants. For this purpose, a simplified, two-dimensional kinematic model for the variable depth of flow was used. The analysis of the impact of the discharge of impurities under steady flow of water was performed by solving an equation of unsteady transport of pollution. Numerical simulations were carried out for: temperature, BOD, DO, total suspension, TOC, biogenic compounds, sulfates, chlorides and metals. The analysis was subject to the distribution of the concentration of contaminants in the discharge site, as well as its range along the river bank. In order to determine the concentration of individual pollution indicators in the discharge location, measurements of their concentration in different seasons were carried out. These results were the initial condition in conducting numerical simulations. The analysis made it possible to demonstrate that the concentration discharged into the Vistula river pollution does not exceed the limit values for each of the indicators.
Analysis of the influence of ferromagnetic contaminations in plastics on the measurements of disturbances of magnetic field of the Earth
- Mirosław Wołoszyn
- Kazimierz Jakubiuk
- Mateusz Flis
2016 Pełny tekst Przegląd Elektrotechniczny
Plastics can be contaminated with small particles or filings with ferromagnetic properties. These contaminations cause significant disturbances in the magnetic field in the case of taking measurements of very low magnetic fields. The analysis of the influence of contaminated plastics on magnetic measurements is presented in this paper.
Analysis of the objects images on the sea using Dempster-Shafer Theory
- Katarzyna Bobkowska
2016
The paper presents the concept of using aerial and satellite imagery or images coming from the marine radar to identify and track vessels at sea. The acquired data were subjected to a highly advanced image analysis. The development of remote sensing techniques allows to gain a huge amount of data. These data are useful information source however usually we have to use different data mining methods to gain interested information. In this paper there is described a special approach based on specific approach coming from advanced image analysis method created for the purpose of tracking objects. Unfortunately, object recognition using image analysis involves some level of uncertainty. Therefore, in the final identification process we have to take into account the belief and the plausibility functions.
Analysis of the parameters of respiration patterns extracted from thermal image sequences
- Jacek Rumiński
2016 Biocybernetics and Biomedical Engineering
Remote estimation of vital signs is an important and active area of research. The goal of this work was to analyze the feasibility of estimating respiration parameters from video sequences of faces recorded using a mobile thermal camera. Different estimators were analyzed and experimentally verified. It was demonstrated that the respiration rate, periodicity of respiration, and presence and length of apnea periods could be reliably estimated from signals recorded using a portable thermal camera. The size of the camera and efficiency of the methods allow the implementation of this method in smart glasses.
ANALYSIS OF THE POSSIBILITIES OF HIGH SPEED SHAFT BEARING SYSTEM DURABILITY INCREASE
- Bastian Bartosz
- Rafał Gawarkiewicz
- Michał Wasilczuk
2016 Pełny tekst TRIBOLOGIA
During the operation of wind turbines with a gearbox of traditional configuration, a high failure rate of high-speed shaft bearings is observed. Such a high failures frequency is not reflected in standard bearing durability calculation methods, which can be attributed to atypical failure mechanism. To avoid observed problems in the 1.5 MW wind turbine, the modification of the existing bearing system is proposed. Multiple options, utilizing various bearing types were investigated. Different versions were examined for a potential durability increase, the extent of necessary design modifications, and possibility of solving existing problems in operation.