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Tytuł:
Wpływ własności absorpcyjno-emisyjnych ściany wewnętrznej na charakterystykę cieplną fasady podwójnej
The efect of wall emission-absorption on thermal characteristic of DSF
Autorzy:
Heim, D.
Jabłoński, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/363014.pdf
Data publikacji:
2007
Wydawca:
Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Tematy:
fasady podwójne
absorpcja
emisja
magazynowanie ciepła
energooszczędność
emission
double facades systems
absorption
heat accumulation
Opis:
W niniejszej pracy przeanalizowano wpływ emisyjności powierzchni ściany pomidzy użytkową przestrze- nią budynku a przestrzenią podwójnej fasady na cieplne zachowanie się przegrody oraz jej wydajność energetyczną. Dyskretyzacji w przestrzeni dokonano za pomocą Metody Objętości Skończonych, zaś analizy symulacyjne wykonano metodą opartą na sprzężonym modelu wymiany ciepła i masy w budynkach [1]. Otrzymano wartości temperatur ekstremalnych w przestrzeni fasady oraz w pomieszczeniu znajdującym się w bezpośrednim, termicznym kontakcie z fasadą.
The paper presents and discusses the efect of the emission-absorption characteristics of the inner skin in double fasades systems (DSF). The second skin of fasades are design inter alia in order to keep the comfort and healthy indoor climate but the properties of inner elements may play so important role as ventilation or shading. The thermal analysis of DSF have been done using the whole building simulation technique -En- vironmental System Performance (ESP). The results of the air and shows the important differences between light and heavy traditional constructions
Źródło:
Fizyka Budowli w Teorii i Praktyce; 2007, T. 2; 79-82
1734-4891
Pojawia się w:
Fizyka Budowli w Teorii i Praktyce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel biocompatible transversal pneumatic artificial muscles made of PDMS/PET satin composite
Autorzy:
Szmechtyk, T.
Sienkiewicz, N.
Koter, K.
Kobierska, A.
Strzelec, K.
Powiązania:
https://bibliotekanauki.pl/articles/779765.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
transversal pneumatic artificial muscles
chemical resistance
thermal characteristic
FT-IR
spectroscopy
static load characteristic
Opis:
In this study novel transversal pneumatic artificial muscles (TPAM), made from composite – poly(dimethylsiloxane) (PDMS) matrix membrane and poly(ethylene terephthalate) (PET) satin reinforcement, are presented. Miniature TPAM consists of a flexible internal braid (IB) reinforcing the membrane and the external braid (EB). EB, with fibers arranged transversely to the IB, is placed laterally. Differently prepared TPAMs were tested for their effectiveness as actuators for robot drive and the PDMS/PET composite suitability was evaluated for applications in human gastrointestinal tract (chemical resistance, thermal characteristic). FT-IR spectra of the composite were compared for study PDMS impregnation process of PET satin and effect of immersion in selected solution. The composite shows outstanding biocompatibility and the muscles have competitive static load characteristics in comparison with other pneumatic artificial muscles (PAM). These results lead to believe, that in the near future painless examination of the gastrointestinal tract using a secure robot will be possible.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 2; 89-96
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrogeochemical characteristic of thermal waters in Bańska Niżna
Autorzy:
Korzec, K.
Powiązania:
https://bibliotekanauki.pl/articles/184477.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
recreation
medicine
rehabilitation
Opis:
Thermal waters belong to the greatest treasures of Podhale. They are used not only in heat engineering but also in recreation, medicine and rehabilitation (Kępińska 2004, 2009, Tomaszewska 2009). It is also known that thermal waters are treated and used for drinking or commercial purposes (Bujakowski & Tomaszewska 2007, Tomaszewska 2009, 2011, Tomaszewska & Bodzek 2013). Thermal waters in Bańska Niżna are exploited by PEC Geotermia Podhalańska S.A. Company. Commercial use of these waters began in 1993, when the system based on geothermal doublet, supplied heat to several houses (Ślimak & Wartak 2009). Currently, the exploitation is made by using three wells: Bańska IG-1 well, Bańska PGP-1 well and Bańska PGP-3 well. Hydrogeochemical characteristic of thermal waters in Bańska Niżna was based on researches concerning the state of those waters, which was being carried out every two weeks between December 2013 and August 2015. Field research was based on measurements of non-stable parameters – pH, electrical conductivity γ 25 and the temperature on the flow. The results of field measurements were supplemented with archival data: water temperature at the well head, pressure and well discharge. The samples for laboratory tests were taken by the author of this work in accordance with the standard ISO 5667-11:2004. The chemical composition analysis of thermal waters was carried out by accredited Hydrogeochemical Laboratory of the Department of Hydrogeology and Engineering Geology AGH in Kraków (certificate of Polish Centre of Accreditation No. AB 1050). This analysis included measurements of concentration of 45 indicators. On the basis of the results of the research, the hydrogeochemical type of thermal waters in Bańska Niżna was defined as sulfate-chloride-sodium-calcium type (according to the classification by Shchukarev–Priklonskiy (Prikłoński & Łaptiew 1955)). The medium values of the basic parameters of analyzed wells, estimated on the basis of data from 2013–2015, are as follows: - Bańska IG-1 well: pH 6.63, γ 25 3.48 mS/cm, temperature at the well head 78.5°C, pressure 11.8 ba, well discharge 58.1 m 3 /h, mineralization 2522.8 mg/dm 3 ; - Bańska PGP-1: pH 6.69, γ 25 3,39 mS/cm, temperature at the well head 85.9°C, pressure 14.4 ba, well discharge 317.3 m 3 /h, mineralization 2533.6 mg/dm 3 ; - Bańska PGP-3: pH 6.72, γ 25 3.43 mS/cm, temperature at the well head 85.0°C, pressure 14.0 ba, well discharge 221.3 m 3 /h, mineralization 2514.3 mg/dm 3. The database from the years 2013–2015 was supplemented by archival results of chemical composition analyzes. On that basis, the assessment of the thermal waters chemical composition stability in Bańska Niżna was prepared, according to the scheme presented in work (Kmiecik & Korzec 2015). It is especially important because physical parameters and chemical composition of geothermal waters can be change during the long-term exploitation. According to Polish law, confirm stability of the physico-chemical parameters is necessary because using these waters in medicine (Dz.U. 2011, nr 163, poz. 981 art. 5). Moreover, the hydrogeochemical model of formation of those waters was defined.
Źródło:
Geology, Geophysics and Environment; 2016, 42, 1; 85-86
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of characteristic diagram based thermal error compensation via load case dependent model updates
Autorzy:
Naumann, Christian
Glänzel, Janine
Dix, Martin
Ihlenfeldt, Steffen
Klimant, Philipp
Powiązania:
https://bibliotekanauki.pl/articles/2086271.pdf
Data publikacji:
2022
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
thermal effect
machine tool
compensation
regression analysis
Opis:
The compensation of thermal errors in machine tools is one of the major challenges in ensuring positioning accuracy during cutting operations. There are numerous methods for both the model-based estimation of the thermal tool center point (TCP) deflection and for controlling the thermal or thermo-elastic behavior of the machine tool. One branch of thermal error estimation uses regression models to map temperature sensors directly onto the TCP-displacement. This can, e.g., be accomplished using linear models, artificial neural networks or characteristic diagrams. One of the main limitations of these models is the poor extrapolation behavior with regard to untrained load cases. This paper presents a new method for updating characteristic diagram based compensation models by combining existing models with new measurements. This allows the optimization of the compensation for serial production load cases without the effort of computing a new model. The new method was validated on a 5-axis machining center.
Źródło:
Journal of Machine Engineering; 2022, 22, 2; 43--56
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka termicznych pór roku oraz charakterystycznych okresów termicznych w Poznaniu w latach 1951-1985
Characteristic of thermal seasons and specific thermal periods in Poznan during 1951-1985
Autorzy:
Lotko-Łozinska, A.
Powiązania:
https://bibliotekanauki.pl/articles/2095809.pdf
Data publikacji:
1991
Wydawca:
Poznańskie Towarzystwo Przyjaciół Nauk
Źródło:
Badania Fizjograficzne nad Polską Zachodnią. Seria A:Geografia Fizyczna; 1991, 42; 165-182
0067-2807
Pojawia się w:
Badania Fizjograficzne nad Polską Zachodnią. Seria A:Geografia Fizyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Stability Criteria of $Se_{80-x}Te_{20}Sb_{x}$ in Terms of Characteristic Temperatures and Kinetic Parameters
Autorzy:
Shaaban, E.
Elshaikh, H.
Soraya, M.
Powiązania:
https://bibliotekanauki.pl/articles/1401891.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.-e
52.40.Db
Opis:
Thermal stability in terms of characteristic temperature and kinetic parameters of different compositions of glassy $Se_{80-x}Te_{20}Sb_{x}$ (x=0, 2, 4, 6, 8, 10) have been investigated. Differential scanning calorimetry under nonisothermal conditions have been proposed to investigate thermal characteristic of these compositions. The thermal stability of these glasses was obtained in terms of various simple quantitative methods based on the characteristic temperatures, such as the glass transition temperature, $T_{g}$, the onset temperature of crystallization, $T_{in}$, the temperature corresponding to the maximum crystallization rate, $T_{p}$, and the melting temperature, $T_{m}$. Furthermore, the kinetic parameter $K_{r}(T)$ was achieved as another indicator for thermal stability and its results about stability compared with those evaluated by other criteria. The results of both the criteria and the kinetic parameter $K_{r}(T)$ confirm that the thermal stability increases with increase of Sb content. The results also refer to that: the glass transition $T_{g}$, activation energy of crystallization $E_{p}$ and the frequency factor $K_{0}$ were increased with the addition of Sb. These results have been discussed in terms of the average coordination number, cohesive energy and average heat of atomization.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 358-366
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermolift oil recovery technologies stimulated with a resource-saving energy system
Technologie wydobycia ropy naftowej Thermolift, w których stosowany jest system energetyczny pozwalający na oszczędne wykorzystanie zasobów
Autorzy:
Hasanov, Ramiz
Ramazanov, Fazil
Musavi, Saida
Kazimov, Musa
Powiązania:
https://bibliotekanauki.pl/articles/31344031.pdf
Data publikacji:
2022
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
well
thermal lift
thermal activity
electrochemical generator
metric characteristic
threshold value
compatibility
electrophysical phenomena
material support
odwiert
wypór termiczny
aktywność termiczna
generator elektrochemiczny
cechy wskaźników
wartość progowa
kompatybilność
zjawiska elektrofizyczne
wsparcie materiałowe
Opis:
In this article, the creation of a thermal lift technology for oil wells through the use of installations with a solid oxide fuel cell has been discussed. The necessary calculations were carried out to determine the level of thermal activity in wells producing hydrocarbon resources of various compositions. Arrangements necessary to achieve this thermal activity based on solid oxide fuel cells (SOFCs) are proposed. SOFC metric characteristics are proposed that are compatible with their additional phenomena, namely, material support, shape, etc. The threshold value of the operating thermal characteristic of SOFCs is obtained depending on the structural and physical properties of their material support. The most effective ways for determination of the required thermobaric parameters of the fluid in accordance with the formation area and product, development of a resource-saving complex for the production of percussion fluid in accordance with these parameters, determination of processing periodicity to manage the thermobaric condition of the formation area, assessment of impact on the formation area and other factors generalise them. The purpose of the article is to develop a technology for management the thermobaric condition of the area through alternative resource-saving energy systems (development of Thermolift technology), substantiation of operational parameters and creation of surface equipment. The scientific idea of the presented article significantly increases the mobility of their hydrocarbon reserves on the basis of the thermobaric action of working agents, which are the product of a resource-saving surface complex (i.e. by providing Thermolift technology) and, finally increases the operational efficiency of production wells and, as a result, the production capacity of the reservoirs.
W niniejszym artykule omówiono powstanie technologii wyporu termicznego dla odwiertów ropnych przez zastosowanie instalacji z ogniwem paliwowym ze stałym tlenkiem. Przeprowadzono wymagane obliczenia w celu ustalenia poziomu aktywności termicznej w odwiertach eksploatujących zasoby węglowodorów o różnym składzie ropy naftowej. Zaproponowano układy niezbędne do osiągnięcia tej aktywności termicznej oparte na ogniwach paliwowych ze stałym tlenkiem (SOFC). Zaproponowano takie parametry wskaźników SOFC, które są zgodne z ich dodatkowymi cechami, takimi jak rodzaj zastosowanego materiału, kształt itd. Wartość progowa eksploatacyjnej charakterystyki termicznej SOFC uzależniona jest od właściwości strukturalnych i fizycznych zastosowanego do ich konstrukcji materiału. Związane jest to z najbardziej efektywnymi sposobami określenia wymaganych parametrów temperaturowo-ciśnieniowych eksploatowanego płynu w zależności od obszaru występowania formacji i produktu, opracowaniem bezpiecznego dla zasobów systemu produkcji płynu udarowego zgodnego z tymi parametrami, określeniem częstotliwości przetwarzania w celu zarządzania warunkami temperaturowo- ciśnieniowymi w obrębie formacji, czy też oceną oddziaływania w obszarze występowania formacji. Celem artykułu jest przedstawienie opracowanej technologii do zarządzania warunkami temperaturowo-ciśnieniowymi obszaru złoża wykorzystującej alternatywne, pozwalające na oszczędne wykorzystanie zasobów, systemy energetyczne (technologia Thermolift), wraz z uzasadnieniem parametrów eksploatacyjnych i przedstawieniem osprzętu powierzchniowego. Naukową ideą niniejszego artykułu jest znaczące zwiększenie zakresu mobilności dostępnych zasobów węglowodorów dzięki temperaturowo-ciśnieniowemu działaniu czynników roboczych będących produktem systemu powierzchniowego pozwalającego na bardziej ekonomiczne wykorzystanie zasobów (tj. poprzez dostarczenie technologii Thermolift), a finalnie – zwiększenie wydajności operacyjnej odwiertów eksploatacyjnych, prowadzące w efekcie do wzrostu wydajności produkcyjnej złóż ropy naftowej.
Źródło:
Nafta-Gaz; 2022, 78, 11; 781-800
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermomodernization – Rescue for the Building
Autorzy:
Orłowska, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/27315754.pdf
Data publikacji:
2023
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
energy saving
characteristic
thermal modernization
Opis:
The article discusses issues related to modifying existing buildings to improve their condition in terms of lower energy consumption and reducing heat loss. The study takes the form of a review. Current systems and data are described according to relevant standards. The issue of the energy efficiency of the building is explored. A list of the most common ways of thermal modernization has been presented. Financial support programs were discussed. The merits and drawbacks of the solutions are delineated.
Źródło:
Rocznik Ochrona Środowiska; 2023, 25; 208--214
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Precision Calculations of the Characteristic Impedance of Complex Coaxial Waveguides Used in Wideband Thermal Converters of AC Voltage and Current
Autorzy:
Kubiczek, Krzysztof
Kampik, Marian
Powiązania:
https://bibliotekanauki.pl/articles/2124756.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AC voltage standard
current shunt
characteristic impedance
multilayer cylindrical conductor
FEM simulation
modified Bessel functions
numerical stability
calorimetric thermal voltage converter
ac-dc transfer difference
Opis:
The article presents precision and numerically stable method of calculation of the characteristic impedance of cylindrical multilayer waveguides used in high-precision wideband measuring instruments and standards, especially calculable thermal converters of AC voltage and precision wideband current shunts. Most of currently existing algorithms of characteristic impedance calculation of such waveguides are based upon approximations. Unfortunately, application of such methods is limited to waveguides composed of a specific, usually low number of layers. The accuracy of approximation methods as well as the number of layers is sometimes not sufficient, especially when the coaxial waveguide is a part of precision measurement equipment. The article presents the numerically stable matrix analytical formula using exponentially scaled modified Bessel functions to compute characteristic impedance and its components of the cylindrical coaxial multilayer waveguides. Results obtained with the developed method were compared with results of simulations made using the Finite Element Method (FEM) software simulations. Very good agreement between results of those two methods were achieved.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 3; 527--533
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Detector Characteristic on the Result of Sky Temperature Measurement with the Use of Long-Wave Infrared Camera
Autorzy:
Kruczek, T.
Powiązania:
https://bibliotekanauki.pl/articles/114666.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
thermovision infrared measurements
sky thermal radiation
sky temperature
characteristic of infrared camera detector
Opis:
During the temperature measurements by means of infrared camera the temperature of surrounding elements must be known. In the case of thermovision inspections of the objects exposed to open air space, the surroundings consists of two elements, it is the ground and hypothetical sky surface. The sky temperature measured by long-wave IR camera is of apparent character because it expresses the thermal radiation of the sky within the spectral operational range of this camera i.e. 7.5÷13 μm. The abovementioned spectral range is coincident with so called atmospheric window within which the thermal radiation of the sky is relatively low. The emissivity of atmosphere within this window is low in the central part and high near the limits of the aforementioned range. In relation with the detector characteristic of the IR camera it causes underestimation of the measured sky temperature. This work deals with the analysis of influence of the IR camera detector characteristic on the results of determination of sky temperature and its thermal radiation intensity.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 173-175
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimized grid structures for the characteristic diagram based estimation of thermo-elastic tool center point displacements in machine tools
Autorzy:
Putz, M.
Ihlenfeldt, S.
Naumann, C.
Glänzel, J.
Powiązania:
https://bibliotekanauki.pl/articles/100061.pdf
Data publikacji:
2017
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
characteristic diagram
adaptive structured grids
thermoelastic deformation
grid optimization
thermal error estimation
Opis:
It is a well-known problem of milling machines, that waste heat from motors, friction effects on guides and also the milling process itself greatly affect the positioning accuracy and thus the production quality. An economic and energy-efficient method of correcting this thermo-elastic positioning error is to gather sensor data from the machine tool and the process and to use that information to predict and correct the resulting tool center point displacement using high dimensional characteristic diagrams. The size of these characteristic diagrams depends on the number of input variables (sensors) and the fineness of the discretization of the grid. While the number of sensors can usually not be reduced without affecting the quality of the prediction, it is often possible to minimize the size of characteristic diagrams through the use of adaptive grid refinement. This ensures that the finest grid sections correspond with the load cases that have the largest local gradients. Through such adaptive refinement, it is possible to reduce storage capacity and computation time without significant loss of precision. The aim of this article is to examine, test and compare different methods of adaptive grid refinement. For this, simulation data from a machine tool is used.
Źródło:
Journal of Machine Engineering; 2017, 17, 3; 36-50
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation and demonstration of characteristic diagram as well as structure model based correction of thermo-elastic tool center point displacements
Autorzy:
Putz, M.
Ihlenfeldt, S.
Kauschinger, B.
Naumann, C.
Thiem, X.
Riedel, M.
Powiązania:
https://bibliotekanauki.pl/articles/99680.pdf
Data publikacji:
2016
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
hexapod
characteristic diagram
thermal error
simulated
measured
correction algorithm
Opis:
In milling machines, waste heat from motors, friction effects on guides and most importantly the milling process itself greatly affect positioning accuracy and thus production quality. Therefore, active cooling and lead time are used to reach thermal stability. A cheaper and more energy-efficient approach is to gather sensor data from the machine tool to predict and correct the resulting tool center point displacement. Two such approaches are the characteristic diagram based and the structure model based correction algorithms which are briefly introduced in this paper. Both principles have never been directly compared on the same demonstration machine, under the equal environmental conditions and with the same measurement setup. The paper accomplishes this comparison ona hexapod kinematics examined in a thermal chamber,where the effectiveness of both approaches is measured and the strengths and weaknesses of both are pointed out.
Źródło:
Journal of Machine Engineering; 2016, 16, 3; 88-101
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of solar cooker with thermal storage for remote hilly areas: determination of heating and cooling characteristic time
Autorzy:
Raghav, Geetanjali
Sharma, Pankaj Kumar
Kumar, Suresh
Maithani, Rajesh
Iung, Alexis
Quentin, Mercier
Powiązania:
https://bibliotekanauki.pl/articles/2142896.pdf
Data publikacji:
2021
Wydawca:
Centrum Badań i Innowacji Pro-Akademia
Tematy:
solar energy
solar cookers
thermal storage
thermal performance
energia słoneczna
kuchenka słoneczna
magazynowanie ciepła
wydajność cieplna
Opis:
Solar cooking finds a major application in rural areas of Uttarakhand, India, yet its utilization is still limited due to certain limitation such as intermittent nature of solar radiations. This drawback limits solar cooker in becoming a viable alternate solution of LPG and other pollution causing resources such as wood. In order to cater this problem a numerical analysis of box type solar cooker with storage is carried out. The energy stored in the storage material will keep the cooker warm up to the time when food is consumed. Charging and discharging time analysis is performed in with an aim to understand the effect of storage on solar cooker. Heating and cooling characteristic time are being evaluated and analysed with storage. Thermal performance of box type solar cooker is measured in terms of figures of merit according to BIS standards. The effect of storage has also been analysed in terms of charging and discharging time and first figure of merit of box type solar cooker.it has been observed that during discharging the heat is stored for more duration as compared to the charging time as discharge time is approx. 4-5 hours while charging time for the same amount of insolation is around 3-4 hours.
Źródło:
Acta Innovations; 2021, 40; 5-18
2300-5599
Pojawia się w:
Acta Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristic of Oxide Layers Obtained on Titanium in the Process of Thermal Oxidation
Autorzy:
Aniołek, K.
Kupka, M.
Barylski, A.
Mieszczak, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/354531.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
titanium
oxidation
scale
structure
hardness
Opis:
Thermal oxidation in air may be one method to improve the properties of titanium and its alloys through its influence on the structure and properties of the material’s surface layer. This paper presents a description of oxide layers obtained on the surface of Grade 2 titanium as a result of oxidation at temperatures of 600 and 700°C. On the basis of kinetic curves, it was found that the intensity of oxide layer growth increased with oxidation temperature. Studies of the surface morphology of oxide layers showed that the size of the formed oxide particles was greater following oxidation at 600°C. The obtained layers were subjected to X-ray phase analysis and microhardness measurements. Irrespective of oxidation temperature, the scale consisted of TiO2 oxide in the crystallographic form of rutile and of Ti3O oxide. The hardness of oxide layers amounted to around 1265 HV and was more than 4 times higher compared to the material in i ts initial state.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 853-856
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new multigrid based method for characteristic diagram based correction of thermo-elastic deformations in machine tools
Autorzy:
Naumann, Christian
Putz, Matthias
Powiązania:
https://bibliotekanauki.pl/articles/99426.pdf
Data publikacji:
2019
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
thermal effects
algorithm
machine tool
measurement
Opis:
It is a well-known problem of milling machines, that waste heat from motors, friction effects on guides, environmental variations and the milling process itself greatly affect positioning accuracy and thus production quality. An economic and energy-efficient method of correcting this thermo-elastic positioning error is to gather sensor data (temperatures, axis positions, etc.) from the machine tool and the process and to use that information to predict and correct the resulting tool center point displacement using high dimensional characteristic diagrams. The computation of these characteristic diagrams leads to very large sparse linear systems of equations which require a vast memory and computation time to solve. This is particularly problematic for complex machines and varying production conditions which require characteristic diagrams with many input variables. To solve this issue, a new multigrid based method for the computation of characteristic diagrams will be presented, tested and compared to the previously used smoothed grid regression method.
Źródło:
Journal of Machine Engineering; 2019, 19, 4; 42-57
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 24

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