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Tytuł:
Numerical investigation of creep behaviour of high-temperature steam turbine compone
Autorzy:
Banaszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/175375.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
creep
lifetime assessment
steam turbine
Opis:
The paper presents a model for creep basing on the so-called characteristic creep strain. It illustrates its application in computations of old steam turbines components. The presented model is a modification of the Norton model which relates the stress exponent to the creep rupture strength and current stress. Creep strain is a function of the above two quantities, i.e., rupture strength and current stress, and acharacteristic creep strain which is material constant for a given time and temperature. Computational examples regard the rotating and pressure components analysed using the finite element method.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 5-15
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Steam turbines start-ups
Autorzy:
Banaszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/175428.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
turbine
numerical computations
liquid flow parameters
Opis:
The article presents a procedure and the chosen results of numerical computations of liquid flow parameters, which use the data from their measurements realized on the test stand, for the model of formed suction intake with a rib, supplied by the screened open wet well. Comparative analysis of numerical computations and these determined by measurements, did concern the standard flow acceptance criteria.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 169-198
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control and reconfiguration of satellite formations by electromagnetic forces
Autorzy:
Wawrzaszek, R.
Banaszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/307632.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
electromagnetic formation flight (EMFF)
satellite formations
Opis:
Current concept of interferometric missions assume that they employ formations of spacecraft. The cooperation between members of a multisatellite formation is a challenging problem. One of the main difficulties is to implement a reliable system for position control and actuation. A precise control of the position and orientation of each satellite in the array is a key factor in obtaining high quality images of distant objects. The controlling system should frequently collect data about geometry and kinematics of all array elements and use actuators to keep them as close as possible to their nominal positions. Forces that are required for actuation or array reconfiguration in space can be produced by engines of various types. In most cases chemical propulsion is used, with a drawback of limited fuel resources and a danger of polluting optical elements. In our work, we analyze dynamics of satellite formation flight, in which interaction forces result from electromagnetic fields generated by coils with current. We use simple controller equation proposed by members of MIT team to control a formation of two or three aligned satellites rotating around the array's mass center.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 1; 54-58
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interception of a free-rotating satellite: an autonomous rendezvous scenario
Autorzy:
Seweryn, K.
Banaszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/307630.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
satellite rendezvous
autonomous control systems
docking maneuvers
Opis:
The spacecraft's lifetime is often limited by reliability and redundancy of its components. Furthermore, serious restrictions on duration of spacecraft operations are posed by finite amount of fuel or cooling agent. It is also clear that once a satellite is launched, it is extremely difficult to replace/modify its hardware on the orbit. Future spacecraft missions, especially huge planetary orbiters, will require servicing support from autonomous unmanned satellites. In this paper we introduce and analyze a new scenario for interception of a free rotating satellite ion a Keplerian orbit. The scenario is divided into several stages to be executed by the servicing satellite: attitude determination of the target object; own motion planning; determination of the optimal target position and orientation before docking; controlled approach, i.e., decreasing of a range between satellites; orbiting of the servicing satellite around the target satellite; docking, i.e., radial degreasing of the intersatellite range till the satellites contact, while keeping constant the relative orienta- tion between them. The control algorithm for the servicing satellite motion during its maneuvers is described. Finally, a few examples of satellite motion simulations according to the proposed scenario are presented.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 1; 59-62
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applicability of notch stress-strain correction methods to low-cycle fatigue life prediction of turbine rotors subjected to thermomechanical loads
Autorzy:
Banaszkiewicz, M.
Dudda, W.
Powiązania:
https://bibliotekanauki.pl/articles/386989.pdf
Data publikacji:
2018
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
low-cycle fatigue
turbine rotors
thermo-mechanical load
Opis:
The paper analyses the possibility of using analytical methods of notch stress-strain correction in low-cycle fatigue life predictions of steam turbine rotors operating under non-isothermal conditions. The assessment was performed by comparing strain amplitudes calculated using the Neuber and Glinka-Molski methods and those predicted by the finite element analysis (FEA) employing elastic-plastic material model. The results of investigations reveal that the Neuber method provides an upper bound limit, while the GlinkaMolski method results in a lower bound limit of strain amplitude. In the case of rotor heat grooves, both methods provide equally accurate results of notch strain amplitude and are suited to estimating lower and upper bound limits of low-cycle fatigue life under non-isothermal conditions.
Źródło:
Acta Mechanica et Automatica; 2018, 12, 3; 179-185
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gradient theory for the description of interfacial phenomena in flashing water flows
Autorzy:
Banaszkiewicz, M.
Badur, J.
Powiązania:
https://bibliotekanauki.pl/articles/1953939.pdf
Data publikacji:
2000
Wydawca:
Politechnika Gdańska
Tematy:
capillarity
flashing flow
thermodynamic nonequilibrium
Opis:
The present work concerns the description of phenomena taking place within interfacial regions during a flow of water, which is accompanied by heterogeneous flashing. The main aim of the work is to present a unified approach to first order phase transitions with the inclusion of capillary effects and to built on this basis a mathematical model describing nonequilibrium two-phase flows, in which the properties of the mixture include capillary components. The analysis of the problem was started with a discussion of physical aspects of flashing, which are the contents of Chapter 2. On the basis of the experimental data analysis a physical model of the phenomenon was formulated. In Chapter 3 a gradient description of first order heterogeneous phase transitions was given. The analysis was begun with a discussion of the properties and structure of interfacial areas. On the basis of the analysis constitutive equations for reversible stress tensor and free energy of a two-phase system treated as a homogeneous medium were formulated. The constitutive equations include capillary components modelled by means of the dryness fraction gradients and resulting from the nonuniformity of the system caused by the existence of two phases and interfacial surfaces. On the basis of the proposed theory a homogeneous model of two-phase flow with capillary effects was derived, which is a subject of Chapter 4. Taking into consideration the assumptions of the homogeneous model, one-dimensional balance equations for mass, momentum and energy of the mixture and mass of vapour were derived. A constitutive equation for the source term appearing in the last equation was obtained on the basis of the theory of internal parameters with the usage of the proposed form of free energy including a gradient term known from the second gradient theory. The remaining constitutive equations for the density of the two-phase system, wall shearing stresses and capillary pressure were also given. The proposed mathematical model was investigated from the point of view of wave properties, which were discussed in Chapter 5. The analysis of small disturbations was conducted, as a result of which a dispersion equation was obtained giving a relation between the velocity of disturbations, attenuation coefficient and frequency. This dispersive model was then applied for the prediction of critical mass flux in a channel flow using PIF method. On the basis of the comparison of the model predictions with experimental measurements a reasonably good agreement was found. In Chapter 6 the results of numerical calculations of flashing flow in channel were presented. Since the proposed mathematical model contains several phenomenological coefficients, a parametric analysis was performed in order to determine their value and the influence on solutions. For the sake of the analysis the classical benchmark experiment known as the Moby Dick was used. After fitting the solution of the model into the experimental measurements new calculations for other runs and other experiments were carried out. As a result of the analysis a good agreement of the model with reality was found, as well as its usefulness for the calculations of pressure and void fraction distributions in channels and for the determination of mass flow rate of two-phase systems. It constitutes a confirmation of the correctness of the proposed model as well as the theory on the basis of which it was built.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 2; 213-290
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A verification approach to thermoelastic steam turbine rotor analysis during transient operation
Autorzy:
Dominiczak, K.
Banaszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/175490.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steam turbine
thermal stress
thermal growth
differential expansion
Opis:
This paper presents a verification approach to thermoelastic steam turbine rotor analysis. Neither temperature nor stresses are measured on the rotor surface in utility power plants. Therefore analysis of the steam turbine rotor can be verified only based on absolute and differential thermal expansion measurements in vicinity of the steam turbine. Absolute and differential expansion measurements and steam turbine fixed points arrangement allow to calculate thermal growth of the steam turbine rotor during transients. Thermal growth of the rotor can be a baseline for the calculation using a numerical model.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2016, 131; 55-65
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A methodology for online rotor stress monitoring using equivalent Green’s function and steam temperature model
Autorzy:
Banaszkiewicz, M.
Dominiczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/175458.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Steam turbine
thermal stress
Green's functions
Duhamel’s integral
Opis:
The requirement of high operational flexibility of utility power plants creates a need of using online systems for monitoring and control of damage of critical components, e.g., steam turbine rotors. Such systems make use of different measurements and mathematical models enabling calculation of thermal stresses and their continuous control. The paper presents key elements of the proposed system and discusses their use from the point of view of thermodynamics and heat transfer. Thermodynamic relationships, well proven in design calculations, were applied to calculate online the steam temperature at critical locations using standard turbine measurements as input signals. The model predictions were compared with operational data from a real power plant during a warm start-up and show reasonably good accuracy. The effect of variable heat transfer coefficient and material properties on thermal stresses was investigated numerically by finite element method (FEM) on a cylinder model, and a concept of equivalent Green’s function was introduced to account for this variability in thermal stress model based on Duhamel’s integral. This approach was shown to produce accurate results for more complicated geometries by comparing thermal stresses at rotor blade groove computed using FEM and Duhamel’s integral.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2016, 133; 13-37
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of the onset of condensation in the IMP PAN nozzle for cases without the appearance of shock waves in the steam flow
Autorzy:
Kornet, S.
Banaszkiewicz, M.
Badur, J.
Powiązania:
https://bibliotekanauki.pl/articles/175439.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spinodal
binodal
spontaneous condensation
SCWS model
IMP PAN nozzle
wilson line
Opis:
The present paper focuses on the prediction of the spontaneous condensation phenomena in the wet steam flow depending on the inlet temperature. The basic tests including comparison with experimental data have been performed using the planar symmetrical nozzle with the de Laval geometry (IMP PAN nozzle). It was assumed in calculations that steam is pure and does not contain heterogeneous sources of condensation. Numerical analysis was performed for boundary conditions which correspond to the flow regime without the shock wave. The present work includes simulations results of the onset of condensation and shows whether initiation of phase transition is located in the region between a spinodal and a binodal. Numerical results along the nozzle axis are presented on thermodynamic diagrams for all considered flow conditions.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2017, 138; 107-123
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced lifetime assessment of steam turbine components based on long-term operating data
Autorzy:
Banaszkiewicz, M.
Radulski, W.
Dominiczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/139746.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steam turbine
lifetime assessment
creep
low cycle fatigue
turbina parowa
szacowanie cyklu życia
pełzanie
zmęczenie niskocyklowe
Opis:
The paper presents a new method of lifetime calculations of steam turbine components operating at high temperatures. Component life is assessed on the basis of creep-fatigue damage calculated using long-term operating data covering the whole operating period instead of representative events only. The data are analysed automatically by a dedicated computer program developed to handle big amount of process data. Lifetime calculations are based on temperature and stress analyses performed by means of finite element method and using automatically generated input files with thermal and mechanical boundary conditions. The advanced lifetime assessment method is illustrated by an example of lifetime calculations of a steam turbine rotor.
Źródło:
Archive of Mechanical Engineering; 2018, LXV, 4; 579-597
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MUPUS insertion device for the Rosetta mission
Autorzy:
Grygorczuk, J.
Banaszkiewicz, M.
Seweryn, K.
Spoin, T.
Powiązania:
https://bibliotekanauki.pl/articles/307634.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
comets
penetrators
hammering device
Opis:
An original mechanical device designed to insert a penetrator into a cometary nucleus in an almost gravityfree environment is described. The device comprises a hammer and a power supply system that stores electrical energy in a capacitor. The accumulated energy is discharged through a coil forming a part of electromagnetic circuit that accelerates the hammer. The efficiency of converting the electrical energy to kinetic energy of the hammer is not very high (amounts to about 25%), but the system is very reliable. Additionally, the hammer energy can be chosen from four power settings, hence adjustment of the stroke's strength to nucleus hard- ness is possible. The device passed many mechanical, func- tional, thermal and vibration tests and was improved from one model to another. The final, flight model was integrated with the lander Philae and started its space journey to comet Churyumov-Gerasimenko in March 2004.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 1; 50-53
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wybranych zmiennych determinujących występowanie zaburzeń nastroju po porodzie
Analysis of selected variables determining the occurrence of postpartum depression
Autorzy:
Kazmierczak, M.
Gierszewska, M.
Gebuza, G.
Mieczkowska, E.
Banaszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/4428.pdf
Data publikacji:
2014
Wydawca:
Instytut Medycyny Wsi
Źródło:
Medycyna Ogólna i Nauki o Zdrowiu; 2014, 20(49), 4
2083-4543
Pojawia się w:
Medycyna Ogólna i Nauki o Zdrowiu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eksploracja warstw podpowierzchniowych Księżyca z wykorzystaniem penetratora ''KRET''
Moon's sub-surface layers exploration by using ''KRET'' penetrator
Autorzy:
Grygorczuk, J.
Seweryn, K.
Wawrzaszek, R.
Banaszkiewicz, M.
Rybus, T.
Powiązania:
https://bibliotekanauki.pl/articles/300467.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
penetratory
penetrators
Opis:
Przyrządy wykorzystywane na lądownikach księżycowych muszą charakteryzować się niewielką masą oraz niewielkim zużyciem energii elektrycznej. Jednym z rozwiązań pozwalających na spełnienie obu tych kryteriów w przypadku instrumentów przeznaczonych do badania warstw podpowierzchniowych są penetratory. W niniejszym artykule opisano opracowany przez CBK PAN penetrator KRET, który jest unikalną konstrukcją inżynierską przeznaczoną do badania ciał Układu Słonecznego.
Devices utilized in Moon's landing modules have to exhibit low energy consumption as well as low mass. One of the solutions fulfilling both, energy consumption and low mass is the penetrator. This article describes the penetrator KRET created by CBK PAN (Solar Physics Division - Polish Academy of Sciences). Penetrator KRET is a unique engineered construction designed for the Solar System studies.
Źródło:
Wiertnictwo, Nafta, Gaz; 2009, 26, 1--2; 173-184
1507-0042
Pojawia się w:
Wiertnictwo, Nafta, Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie technik satelitarnych w rolnictwie zrównoważonym - wybrane przykłady zastosowań
Applications of satellite technology in sustainable agriculture - selected examples of the use directions
Autorzy:
Banaszkiewicz, M.
Lewiński, S.
Aleksandrowicz, S.
Woźniak, E.
Kotarba, A.
Krupiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/239898.pdf
Data publikacji:
2012
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
rolnictwo zrównoważone
teledetekcja satelitarna
zdjęcia satelitarne
sustainable agriculture
remote sensing
satellite images
Opis:
Teledetekcja satelitarna jest obecnie jednym z podstawowych źródeł informacji o środowisku przyrodniczym i o procesach zachodzących na powierzchni Ziemi. Zdjęcia satelitarne o różnej rozdzielczości przestrzennej, spektralnej oraz radiometrycznej umożliwiają pozyskanie informacji o charakterze przestrzennym, które mogą być interpretowane w sposób bezpośredni lub mogą być wykorzystane w procesach modelowania matematycznego. Na ich podstawie można określić m.in. klasy pokrycia i użytkowania terenu, strukturę upraw, kondycję roślinności, dostępność wody. W pracy przedstawiono wybrane przykłady możliwości zastosowania teledetekcji satelitarnej w monitoringu zmian przestrzeni rolniczej: wyznaczanie stref buforowych, detekcja zmian pokrycia terenu, ocena stanu roślinności oraz zróżnicowania środowiska przyrodniczego.
Satellite remote sensing is one of the main sources of information on natural environment and the processes occurring on the surface of the Earth. Satellite images of different spatial, spectral and radiometric resolution, enable the acquisition of spatial information which may be interpreted directly, or may be used in processes of mathematical modeling. Satellite images may create a basis to determine, among the others, land cover and land use classes, cropping patterns, the condition of vegetation, water availability. This paper presents selected examples of satellite remote sensing application in monitoring of agricultural land: setting of riparian zones, detection of land cover changes, assessment of vegetation status and the diversification of natural environment.
Źródło:
Problemy Inżynierii Rolniczej; 2012, R. 20, nr 3, 3; 109-122
1231-0093
Pojawia się w:
Problemy Inżynierii Rolniczej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lęk przed porodem w III trymestrze ciąży i jego powiązania ze stanem noworodka
Fear of childbirth in the third trimester of pregnancy and its correlation with the condition of neonate
Autorzy:
Gebuza, G.
Kazmierczak, M.
Gierszewska, M.
Mieczkowska, E.
Banaszkiewicz, M.
Wrobel-Bania, A.
Powiązania:
https://bibliotekanauki.pl/articles/3897.pdf
Data publikacji:
2015
Wydawca:
Instytut Medycyny Wsi
Opis:
Wstęp. Wiele badań na świecie sugeruje powiązanie prenatalnego niepokoju i nieprawidłowego przebiegu ciąży ze stanem zdrowia noworodka. Skutecznym predyktorem dobrostanu kobiet ciężarnych i noworodków może być wsparcie społeczne od bliskich osób. Cel. Ocena lęku przed porodem i jego związek ze stanem zdrowia noworodka w skali Apgar, masą ciała i nieprawidłowościami pępowiny oraz określenie predyktorów dobrostanu kobiet. Materiał i metody. Badania przeprowadzono w III trymestrze ciąży u 199 kobiet. Lęk przed porodem mierzono Kwestionariuszem Lęku Porodowego (KLPII). Wykorzystano również Berlińskie Skale Wsparcia Społecznego (BSSS) oraz Skalę Satysfakcji z Życia (SWLS). Po porodzie zebrano dane dotyczące oceny noworodków w skali Apgar, masę ciała noworodków i wystąpienie powikłań pępowinowych podczas porodu. Wyniki. Nie stwierdzono różnicy w poziomie lęku przed porodem u matek ze względu na niską wagę ciała noworodków, niską punktację w skali Apgar i powikłania pępowiny. Satysfakcja z życia jest związana z otrzymanym wsparciem społecznym. Wraz ze wzrostem ryzyka ciąży wzrasta poziom otrzymanego przez kobiety wsparcia społecznego. Wnioski. Lęk przed porodem u kobiet w III trymestrze ciąży nie jest związany ze złym stanem noworodka. Należy prowadzić dalsze badania oceniające związek lęku przed porodem ze stanem zdrowia noworodka.
Background. Many studies worldwide have suggested the existence of a relationship between prenatal anxiety and abnormal course of pregnancy, and the health status of the neonate. Social support received from close friends and relatives may constitute an effective predictor of the welfare of pregnant women and newborns. Objectives. The aim of the present study was to assess the level of childbirth fear and its correlation with neonatal health status evaluated using the Apgar scale, neonatal body mass and umbilical cord complications, as well as to determine the predictors of women’s welfare. Methods. The study included 199 women in the third trimester of pregnancy. The fear of childbirth was measured using the Fear of Childbirth Questionnaire (KLP II). The Berlin Social Support Scales (BSSS) and the Satisfaction with Life Scale (SWLS) were also applied. After parturition, data concerning neonatal assessment in the Apgar scale, neonatal body mass and umbilical cord complications during delivery were collected. Results. No differences were found in the level of childbirth fear in mothers with regard to low neonatal body weight, low scores in the Apgar scale and umbilical cord complications. Satisfaction with life correlates with received social support. The level of social support received by women increases along with an increase in pregnancy risk. Conclusions. The fear of childbirth in women in the third trimester of pregnancy does not correlate with poor health status of the neonate. Further research should be carried out in order to determine correlations between the fear of childbirth and the health status of the neonate.
Źródło:
Medycyna Ogólna i Nauki o Zdrowiu; 2015, 21(50), 1
2083-4543
Pojawia się w:
Medycyna Ogólna i Nauki o Zdrowiu
Dostawca treści:
Biblioteka Nauki
Artykuł
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