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Tytuł:
Modeling and analysis of systolic and diastolic blood pressure using ECG and PPG signals
Modelowanie i analiza skurczowego i rozkurczowego ciśnienia krwi z wykorzystaniem sygnałów EKG i PPG
Autorzy:
Vasilevskyi, Oleksandr
Popovici, Emanuel
Sarana, Volodymyr
Powiązania:
https://bibliotekanauki.pl/articles/27315432.pdf
Data publikacji:
2023
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
systolic pressure
diastolic pressure
ECG and PPG signals
measurement
method for determining blood pressure
ciśnienie skurczowe
ciśnienie rozkurczowe
sygnały EKG i PPG
pomiar
metoda określania ciśnienia krwi
Opis:
Taking into account the peculiarities of using the MAX86150 evaluation system for measuring ECG and PPG signals, mathematical models were developed for indirect determination of systolic and diastolic pressure using fingers on the hand, which were tested in the MATLAB environment. Received ECG and PPG signals. Based on the proposed mathematical models, ECG and PPG signals were processed in the MATLAB package and the results of indirect measurement of blood pressure were presented.
Biorąc pod uwagę specyfikę wykorzystania systemu oceny MAX86150 do pomiaru sygnałów EKG i PPG, opracowano modele matematyczne do pośredniego określania ciśnienia skurczowego i rozkurczowego używając palców dłoni, które zostały przetestowane w środowisku MATLAB. Otrzymano sygnały EKG i PPG. W oparciu o zaproponowane modele matematyczne, sygnały EKG i PPG zostały przetworzone w pakiecie MATLAB oraz przedstawiono wyniki pośredniego pomiaru ciśnienia krwi.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2023, 13, 3; 5--10
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rock mass classification in highway tunnel engineering during exploration phase and case study
Autorzy:
Yanqiang, Du
Bing, Xie
Powiązania:
https://bibliotekanauki.pl/articles/27312070.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
inżynieria tunelowa
tunel autostradowy
klasyfikacja górotworu
ciśnienie ziemi
metoda jakości
metoda podstawowa
tunnel engineering
highway tunnel
rock mass classification
earth pressure
basic method
quality method
Opis:
It is the foundation of tunnel engineering to classify the rock mass surrounding tunnels. However, it is not easy to precisely determine the class of rock mass in practice as sufficient geological exploration need to be completed before rock mass classification, and there exists some disputes referring to the rationalization of dozens of methods for rock mass classification through the world. The principles and procedures of the basic quality method, which are widely used in China, are presented in this paper, and the application process of the basic quality method is showed with a project case of Zhongnanshan highway tunnel which has operated in safety for nearly a decade. Then, both the advantages and disadvantages of the basic quality method are analyzed in terms of practical engineering applications. In consideration of the defects of the basic quality method, the concept of the subclassing of surrounding rock in grade III-V is developed in the end and the criterion is given to determine the subclass of rock mass. This study is aimed at providing some useful ideas and a reference for rock classification in highway tunnel engineering.
Źródło:
Archives of Civil Engineering; 2023, 69, 2; 141--153
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of semi-automated calibration system for pressure balances
Autorzy:
Türk, Ahmet
Hamarat, Abdullah
Durgut, Yasin
Powiązania:
https://bibliotekanauki.pl/articles/2173904.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
semi-automated calibration
pressure balance
digital manometer assisted method
Opis:
In this study, a digital manometer was used as a transfer standard to perform calibration of a pneumatic pressure balance. The same pressure balance was calibrated with the cross-floating method based on falling rate determination (FRD). Average of differences among the effective area results show an agreement of less than 10 ppm between the digital manometer-assisted calibration (DMAC) method and the FRD method. The method in which a digital pressure gauge is used as a transfer standard not only facilitates calibration but also enables the automation of pressure balance calibration. Full automation of pressure balance calibration requires an automatic mass loading system for both the reference instrument and the device under test. Since there is a lot of different kinds of pressure balances, it is nearly impossible for a pressure metrology laboratory to have an automatic mass-handler system for every type of pressure balance. Therefore, a more efficient way in which automated mass-handler systems are not required .., a semi-automatic calibration system, is designed. For that purpose, two different calibration procedures, increasing-decreasing cycles, and pressurize-vent (P-V) procedures are performed and compared. The equivalence of procedure results makes the semi-automated calibration design of pressure balances possible. The most distinguishing advantages of a semi-automated calibration system are the applicability to any type of pressure balance and low cost compared to full automation.
Źródło:
Metrology and Measurement Systems; 2022, 29, 4; 623--638
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the efficiency of restrained oil displacement using of enhancing oil recovery methods
Autorzy:
Uhrynovskyi, A. V.
Moroz, L. B.
Kogut, G. M.
Powiązania:
https://bibliotekanauki.pl/articles/2055748.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
oil
field
oil recovery coefficient
tertiary method
formation pressure maintenance
ropa naftowa
pole
współczynnik odzysku
Opis:
Purpose: The purpose of this article is to highlight the main problems that arise during the final stage of oil field development. Based on the identified problems using the EORgui program, Petroleum Solutions Ltd it is necessary to select the most effective method to increase oil recovery and study the most optimal tertiary oil recovery method using a hypothetical field model as an example, which will ensure the maximum oil recovery factor. Design/methodology/approach: Study of oil tertiary displacement efficiency by applying tertiary methods were performed using EORgui software from Petroleum Solutions Ltd and Petrel from Shlumberger. Findings: The results of the research show that the most optimal method of oil recovery increasing for this hypothetical field is the injection of carbon dioxide. When using this method, the oil recovery rate reaches 23%. Research limitations/implications: When using carbon dioxide, it is necessary to have sources of supply near the field, as well as increased corrosion of petroleum equipment is possible to occur. Practical implications: The use of the proposed approach is an important condition for the effective extraction of residual oil reserves for most fields developed using the reservoir pressure maintenance system. Originality/value: The article presents the characteristic features of residual oil location, reveals the conditions for effective usage of methods to increase oil recovery and their selection procedure.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 110, 1; 27--34
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Contact Strength, Tooth Wear and Metal-Polymer Life of Worm Gears
Autorzy:
Czerniec, Myron
Świć, Antoni
Powiązania:
https://bibliotekanauki.pl/articles/2201754.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
metal-polymer worm gear
PA6 polyamide
PA6+30GF
Archimedes worm gears
involute worm gears
calculation method
tooth correction
contact pressure
tooth wear
tooth life
Opis:
This paper presents results of a study investigating worm gears consisting of polymer worm wheels and steel involute and Archimedes worms. The author uses his own calculation method to predict polymer wheel wear, gear life and maximum contact pressure in mesh. The effect of tooth correction and wear on gear life and contact pressure is considered. Cases of double and triple tooth engagement are analysed. The worm wheel is made of non-reinforced polyamide PA6. Quantitative and qualitative relationships are established between the maximum initial contact pressure along tooth profile and the tooth correction coefficient. Tooth wear causes a considerable decrease in contact pressure, with the highest decrease observed at the exit of engagement. The maximum contact pressure is generated at the exit of engagement. The same trend is observed for tooth wear. The minimum gear life is observed at the exit of engagement. It increases linearly with increasing the coefficient of tooth correction. The gear life significantly increases (by approx. 56%) in triple tooth engagement compared to double tooth engagement.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 3; 143--154
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The high-pressure sorptomat - a novel apparatus for volumetric sorption studies under isobaric high gas pressure conditions
Autorzy:
Kudasik, Mateusz
Anioł, Łukasz
Skoczylas, Norbert
Powiązania:
https://bibliotekanauki.pl/articles/2173899.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sorptomat
sorption
high-pressure apparatus
volumetric method
Opis:
As part of the work the high-pressure sorptomat - a novel apparatus for sorption tests under conditions of high gas pressure was developed. The sorption measurement is carried out using the volumetric method, and the precise gas flow pressure regulator is used in the device to ensure isobaric conditions and regulate the sorption pressure in the range of 0-10 MPa. The uniqueness and high precision of sorption measurements with the constructed apparatus are ensured by the parallel use of many pressure sensors with a wide measurement range as well as high precision of measurement - due to the use of precise pressure sensors. The obtained results showed, i.a. that the time of reaching the isobaric conditions of the measurement is about 6-7 seconds and it is so short that it can be considered a quasi-step initiation of sorption processes. Moreover, the results of the measurement pressure stabilization tests, during the CO2 sorption test on activated carbon, have shown that the built-in pressure regulator works correctly and ensures isobaric sorption measurement conditions with the precision of pressure stabilization of ±1% of the measurement pressure. The maximum range of sorption measurement using the high-pressure sorptomat is 0-86 400 cm3/g, and the maximum measurement uncertainty is ±2% of the measured value. The activated carbon sample used for the tests was characterized by a high sorption capacity, reaching 104.4 cm3/g at a CO2 pressure of 1.0 MPa.
Źródło:
Metrology and Measurement Systems; 2022, 29, 4; 607--620
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A combined method to predict impact pressure on planing craft
Autorzy:
Tahmasvand, Hossein
Zeraatgar, Hamid
Powiązania:
https://bibliotekanauki.pl/articles/1573665.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
impact pressure
acceleration
2.5D method
equivalent wedge method
planing craft
Opis:
Prediction of the pressure distribution on a planing craft in waves deeply affects its structural design and safe operation. In this paper, the possibility of pressure prediction for the planing craft in waves is studied. A combined method is formulated by which craft motions in waves are computed using a 2.5D method, and the impact pressure is anticipated by the equivalent wedge method. Experiments are conducted to record the vertical acceleration and pressure time trends on a model. Comparing the results of the combined method with the experiments indicates that this approach successfully predicts the heave and pitch motions and the time evolution of the acceleration and pressure. The method presents good estimations for the peaks of the acceleration and pressure. Using the combined method, a parametric study on maximum peak acceleration and pressure is also conducted for various forward velocities and wave heights. It has been shown that the combined method is a fast and reliable tool for maximum peak pressure prediction. The method may be employed for structural design and optimization.
Źródło:
Polish Maritime Research; 2021, 1; 4-15
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza obudowy wykopu dla budynku z kondygnacją podziemną
Analysis of excavation shoring for building with underground storey
Autorzy:
Ambroziak, Andrzej
Majewski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/1860617.pdf
Data publikacji:
2021
Wydawca:
Polski Związek Inżynierów i Techników Budownictwa
Tematy:
obudowa wykopu
kondygnacja podziemna
parcie gruntu
metoda obliczeń
zabudowa sąsiednia
zabudowa gęsta
metoda parć zależnych
model sprężysto-plastyczny
analiza nieliniowa
strefa oddziaływania
trench lining
underground storey
ground pressure
calculation method
adjacent building
compact development
dependent pressure method
elasto-plastic analysis
non-linear analysis
ground movement
Opis:
W pracy poruszono tematykę analizy obudowy wykopu dla budynku z jedną kondygnacją podziemną, zlokalizowanego w gęstej zabudowie śródmiejskiej. Obliczenia przeprowadzono za pomocą dwóch programów obliczeniowych: GEO 5 (moduł: Ściana Analiza) i Autodesk Robot Structural Analysis Professional. Całość wyników podsumowano, a wnioski sformułowano w odniesieniu do obecnej sytuacji na rynku budowlanym, charakteryzującej się coraz to trudniejszymi warunkami gruntowymi, gęstszą zabudową śródmiejską oraz trudniejszym ukształtowaniem terenu.
The paper addresses excavation shoring analysis for a building with one underground storey, located in high-density urban development. The paper focuses on available computational methods, vital design assumptions and reduction of the impact of structural works on adjacent buildings sensitive to ground motion. Computations have been conducted and compared in two software variants: GEO 5 (Excavation Design module) and Autodesk Robot Structural Analysis Professional. The results are summarized and conclusions are drawn with regard to the current construction industry status. The latter is characterized by increasingly difficult ground conditions, high-density urban development and demanding terrain topography.
Źródło:
Przegląd Budowlany; 2021, 92, 4; 18-34
0033-2038
Pojawia się w:
Przegląd Budowlany
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative FE-studies of interface behavior of granular Cosserat materials under constant pressure and constant volume conditions
Autorzy:
Ebrahimian, B.
Alsaleh, M. I.
Kahbasi, A.
Powiązania:
https://bibliotekanauki.pl/articles/38629565.pdf
Data publikacji:
2021
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
interface shearing
wall roughness
constant pressure
constant volume
dilatancy constraint
Cosserat FE model
discrete element method (DEM)
Opis:
This article shows the outcomes of a systematic series of finite element (FE) calculations relevant to the shear behavior of a particulate-continuum interface system under different normal boundary conditions. In this respect, shearing of a thin and long granular Cosserat layer in the vicinity of a rigid moving wall with varied surface roughness values is analyzed under constant normal pressure and constant volume conditions. The material behavior is defined with a special elasto-plastic Cosserat model, taking into account micro-rotation, micro-curvature, couple stress, and mean particle size. The interaction between the layer of boundary particles and the surface roughness of the adjoining bottom wall is modeled by the rotation resistance of particles along the wall surface. Herein, the coupled effects of normal confining constraints imposed on the layer and the surface roughness of the bottom wall, are considered on the response of granular material under shearing. The influences of pressure level and initial void ratio are explored as well. Numerical results demonstrate that the dilatancy constraint prescribed to the interface plane in the normal direction, and the wall roughness have visible influences on the interface shear resistance as well as the deformation field formed within the layer. After large shearing, the width of the localized zone along the wall does not necessarily depend on the normal confining constraint and the applied pressure level. However, the localized zone characteristics and the interface shear response are mainly affected by the initial void ratio of the material. In addition to FE analyses, DEM-based simulations are also performed to investigate the micro-mechanical response of granular medium adjacent to a wall under shearing. FE predictions are qualitatively compared with DEM results, and reasonable agreement is observed.
Źródło:
Archives of Mechanics; 2021, 73, 5-6; 421-470
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of sound power level of machine by inverse method
Autorzy:
Piechowicz, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/2146645.pdf
Data publikacji:
2021
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
inverse method
sound power
sound pressure level
sound measurement
metoda odwrotna
moc akustyczna
poziom ciśnienia akustycznego
pomiar dźwięku
Opis:
The paper presents the inverse method to estimate the sound power level of machines operated in industrial environments. Values of the partial sound power sources of machine components could be predicted based on the distribution of sound field parameters measured around the machine. Assigning partial sound power levels of machine components allows for the effective selection of efficient noise protection solutions for this machine. Measurements were carried out in an actual mechanical workshop. The multichannel measurement system for simultaneous recording of sound pressure levels and the angle of phase angle shift was used in measurements. Based on the determined the sound power of partial sources, the A-weighted sound pressure levels at the operator's workplace were determined.
Źródło:
Vibrations in Physical Systems; 2021, 32, 1; art. no. 2021113
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Tribological and Mechanical Properties of Biodegradable AZ91 Alloy Produced by Cold Chamber High Pressure Casting Method
Autorzy:
Urtekin, Levent
Arslan, Recep
Bozkurt, Fatih
Er, Ümit
Powiązania:
https://bibliotekanauki.pl/articles/2049430.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
die casting
AZ91 magnesium alloy
cold chamber high pressure casting method
mechanical properties of AZ91 magnesium alloy
wear of AZ91 alloy
tribological properties of AZ91 alloy
Opis:
In this study, AZ91 Magnesium alloy is produced by cold chamber high pressure die casting (HPDC) method. Different combinations of the cold chamber HPDC process parameters were selected as; in-mold pressure values of 1000 bar and 1200 bar, the gate speed of 30 m/s and 45 m/s, the casting temperatures of 640°C and 680°C. In addition, the test samples were produced by conventional casting method. Tensile test, hardness test, dry sliding wear test and microstructure analysis of samples were performed. The mechanical properties of the samples produced by the cold chamber HPDC and the conventional casting method were compared. Using these parameters; the casting temperature 680°C, in-mold pressure 1000 bar and the gate speed 30 m/s, the highest tensile strength and the hardness value were obtained. Since the cooling rate in the conventional casting method is slower than that of the cold chamber HPDC method, high mechanical properties are obtained by the formation of a fine-grained structure in the cold chamber HPDC method. In dry sliding wear tests, it was observed that there was a decrease in friction coefficient and less material loss with the increase of hardness values of the sample produced by the cold chamber HPDC method.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 205-216
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Contact Pressures in Total Hip Replacement
Autorzy:
Czerniec, Myron
Zubrzycki, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/2024022.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
hip endoprosthesis
calculation method
contact mechanics
contact pressure
diameter of the endoprosthesis head
radial clearance
Opis:
Total hip arthroplasty is a complex procedure. The achievements of implantology enabled the development of a faithful representation of hip joint physiology as well as the production of materials that can successfully replace damaged natural tissues. The challenge is to correctly select the geometry of the endoprosthesis adequate to the load of the joint. Materials used for endoprosthesis are a metal head and a polymer cup (e.g. PE-UHMW). The main interactions in the endoprosthesis are friction and contact pressure, which must not exceed their limit. Exceeding them causes the destruction of the biomechanical system - plastic deformation of the polymer that is too large and the formation of unacceptable radial clearances. The paper presents the author's empirical method of determining the contact pressures in the tribological pair of the acetabulum - the head of the hip joint endoprosthesis. Based on the obtained research results, it was shown that the developed method gives correct solutions to the contact problem and gives reliable results. The assumption for the work was to prove that empirical methods give correct solutions to contact problems on a par with simulation methods such as FEM. The aim of the work was to demonstrate the correctness of the author's empirical method for determining the maximum contact pressures. Based on the author's developed calculation method of hip joint endoprosthesis contact parameters, the impact on maximum contact pressure and the angle of contact of the joint load was estimated depending on the diameter of the endoprosthesis and radial clearance. The correctness of changing the values of maximum contact pressure from the mentioned parameters was determined. Correspondingly: an increase in joint load causes a linear increase in the maximum contact pressure; increasing the diameter of the endoprosthesis head - their non-linear decrease, and increasing radial clearance - their increase.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 2; 176-183
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analyzing method to evaluate effect of roadway pressure relief
Autorzy:
Fan, Lei
Wang, Weijun
Yuan, Chao
Powiązania:
https://bibliotekanauki.pl/articles/1402308.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
matter element extension
roadway pressure relief
effect evaluation
method of analysis
Opis:
Based on the theory of matter–element extension, this paper uses the calculation results of FLAC 3D (Fast Lagrangian Analysis of Continua) as raw data to systematically evaluate the effects of roadway pressure relief under different pressure relief options. The results show that: 1) Pressure relief can reduce rock stress on the mining roadway to a certain extent by arranging the pressure relief roadway above or on one side of it. However, the low-stress area formed by the former is larger than that created by the latter. Moreover, appropriately increasing the width of the pressure relief roadway above the mining roadway can effectively improve the stress environment of the mining roadway. 2) The excavation sequence of the pressure relief roadway and the mining roadway has a greater impact on the pressure relief effect. Adopting the method of "excavating the pressure relief roadway first, and after the stress of the surrounding rock of the pressure relief roadway is stabilized, then excavating the mining roadway" can greatly reduce or avoid the disturbance effect caused by the pressure relief roadway excavation. This sequence of excavation can significantly reduce or avoid the effects of disturbances caused by the excavation of the pressure relief roadway. 3) Excavating the pressure relief roadway on one side of the mining roadway can effectively reduce the deformation of its roof, and arranging the pressure relief roadway above the mining roadway can effectively control the deformation of its two sides. Appropriately increasing the width of the pressure relief roadway above the mining roadway can improve the effect of pressure relief.
Źródło:
Mining Science; 2020, 27; 283-302
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of techniques which use the DST flow period data for evaluation of reservoir parameters
Porównanie sposobów oceny parametrów zbiornikowych na podstawie danych zarejestrowanych podczas opróbowań rurowymi próbnikami złoża
Autorzy:
Szpunar, Tadeusz
Budak, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/1834048.pdf
Data publikacji:
2020
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
slug test
type curve method
DST flow period
dimensionless pressure
dimensionless time
wellbore storage
wellbore zone
permeability
metoda wpasowania krzywych
dane okresu dopływu do rpz
bezwymiarowe ciśnienie
czas bezwymiarowy
efekt nagromadzenia w odwiercie
strefa przyodwiertowa
przepuszczalność
Opis:
W artykule przedstawiono porównanie metod wykorzystujących dane pomiarowe okresu przypływu do rurowego próbnika złoża (rpz) do obliczenia przepuszczalności i współczynnika skin efektu. Zestawiono wyniki uzyskane przy zastosowaniu „klasycznej” metody wpasowania krzywych pomiarowych do krzywych teoretycznych oraz wyniki metody podanej w pracy Szpunara (2001). Wykazano, że wyniki obydwu metod nie różnią się w sposób istotny. Omówiono zalety i niedogodności każdej z nich. Metoda opisana przez Szpunara (2001) i rozwinięta przez Szpunara i Budaka (2012) może być zastosowana do interpretacji zachowania ciśnienia dennego lub przebiegu podnoszenia się lustra wody w otworach odwierconych w warstwach węgli oraz studniach wierconych, w których nie ma produkcji samoczynnej, co wymaga wywołania zaburzenia ciśnienia w odwiercie przez wlanie do niego lub odpompowanie z niego porcji cieczy. Poza obliczeniem przepuszczalności i współczynnika skin efektu metoda przedstawiona przez Szpunara (2001) umożliwia określenie przepuszczalności strefy przyodwiertowej oraz głębokości uszkodzenia/poprawy przepuszczalności w strefie przyodwiertowej, pod warunkiem że opory przepływu w przewodzie rurowego próbnika złoża (rpz) są pomijalnie małe. „Klasyczna” metoda określania przepuszczalności przez wpasowanie krzywej pomiarowej do krzywych teoretycznych nie stwarza takich możliwości. Ponadto, zdaniem autorów, „klasyczna” metoda wpasowania krzywych (pomimo jej teoretycznej poprawności) daje wyniki niepewne z uwagi na trudności w dopasowaniu pomierzonej krzywej zależności ciśnienia od czasu do właściwej krzywej teoretycznej, których kształt jest bardzo podobny. Podsumowując, należy stwierdzić, że istnieje akceptowalna zgodność między przepuszczalnością obliczoną przy użyciu każdej z omawianych metod. Nie należy jednak oczekiwać, że przepuszczalność obliczona każdą z tych metod będzie identyczna.
Źródło:
Nafta-Gaz; 2020, 76, 6; 377--386
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elastic solutions based on the Mori-Tanaka scheme for pressurized functionally graded cylinder
Autorzy:
Eker, Mehmet
Yarımpabuç, Durmu
Yıldırım, Ali
Çelebi, Kerimcan
Powiązania:
https://bibliotekanauki.pl/articles/1839733.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
FGM
functional gradient material
pseudospectral Chebyshev method
Mori-Tanaka homogenization
cylindrical pressure vessel
materiał funkcjonalnie gradientowy
cylindryczny zbiornik ciśnieniowy
pseudospektralna metoda Czebyszewa
metoda Czebyszewa
homogenizacja Mori-Tanaka
Opis:
In this paper, an elastic analysis of a thick-walled functionally graded cylinder subjected to internal pressure is examined. Material properties for the isotropic material are estimated to obey the Mori-Tanaka homogenization scheme through the thickness. The resulting two-point irregular boundary value problem is solved by the pseudospectral Chebyshev method that converts the boundary value problem to the system of equations, which can be solved by any appropriate decomposition method. Benchmark solutions are used to validate the method. The effect of the arbitrarily chosen volume fraction index is demonstrated for stress and displacement distributions. The effective stresses for different inner radius and volume fraction index are also discussed.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 4; 57-68
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 97

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