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Wyświetlanie 1-15 z 138
Tytuł:
The influence of temperature on dynamics of the rotor – foil bearing system
Autorzy:
Bagiński, P.
Żywica, G.
Powiązania:
https://bibliotekanauki.pl/articles/175572.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foil bearings
rotordynamics
temperature distribution
Opis:
The paper presents the research on the effect of elevated temperature on the dynamic performance of a rotor supported by foil bearings. The tests were carried out on the test rig equipped with a module for increasing temperature around the bearings. A 3 kW motor with two ceramic ball bearings was connected to the shaft by means of a flexible coupling. The shaft was supported by gas foil bearings. The maximum rotational speed of the rotor was 24000 rpm. The tests were performed with the operating rotor, covering multiple start and stop cycles at room and elevated temperatures. During the first stage of experimental investigation vibration, displacement and temperature values for the two bearings were recorded. Then, the temperature was raised to approx. 200 ◦C within one of the bearing supports. The parameters mentioned above were registered and compared with the results obtained during room temperature operation. After each test bearings were disassembled, regenerated as necessary and reassembled. After analysis of the results achieved, it could be noted that the system was sensitive to the altering of operating conditions of the rotor. The elevated temperature around the shaft has increased its diameter, thereby reducing the lubricating gap. In spite of adverse operating conditions affecting the rotor, the whole system operated in a safe and stable manner.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2016, 134; 11-28
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Numerical Modeling of Thermal Stress Distribution in Thermal Barrier Coatings
Autorzy:
Jasik, A.
Powiązania:
https://bibliotekanauki.pl/articles/353586.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
temperature distribution
thermal stress
TBC
FEM
Opis:
The paper presents the results of numerical calculations of temperature and thermal stress distribution in thermal barrier coatings deposited by thermal spraying process on the nickel based superalloy. An assumption was made to apply conventional zirconium oxide modified with yttrium oxide (8YSZ) and apply pyrochlore type material with formula La2Zr2O7. The bond coat was made of NiCoCrAlY. Analysis of the distribution of temperature and stresses in ceramic coatings of different thicknesses was performed in the function of bond-coat thickness and the type of ceramic insulation layer. It was revealed that the thickness of NiCrAlY bond-coat has not significant influence on the stress distribution, but there is relatively strong effect on temperature level. The most important factor influenced on stress distribution in TBC system is related with type and properties of ceramic insulation layer.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1433-1437
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental testing of the vehicle heating system
Autorzy:
Kucybała, P.
Gawlik, A.
Powiązania:
https://bibliotekanauki.pl/articles/246308.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
heating system
temperature distribution
temperature tests
thermal chamber
Opis:
An important problem in the design of machinery and equipment at the stage of determining their structure is the issue of providing adequate thermal comfort to users while operating in variable climatic and environmental conditions. This issue is of particular importance because all types of machinery and devices are equipped with very expensive and automated control and monitoring system, which should guarantee adequate warming conditions and should work under different climatic conditions. Examples of these tendencies are special solutions for vibroacoustic insulation of the inside of the devices, special air conditioning equipment, special constructions, ergonomic inside solutions. The process of shaping the discussed structural design of vehicles in terms of meeting the relevant technical and operational criteria is currently being increasingly realized through experimental tests of prototypes supported by numerical calculations. The purpose of this paper is to present the methodology of conducting test stand as a stage for the experimental determination and verification of temperature distribution, the location of heating and air conditioning devices in a prototype vehicle in variable climatic conditions (minus 15º C). The research was carried out in a large-scale climate chamber. It covered the process of heating up the passenger area of the bus and the time of temperature stabilization on the inside of the vehicle while operating the heating systems. An additional attempt was made to test the heating system while the vehicle was in motion and to open the vehicle door to simulate the stopping of the vehicle at the bus stop. Another aspect that was analysed was the impact of the installed convector on the vehicle when the liquid heater was off.
Źródło:
Journal of KONES; 2017, 24, 3; 135-141
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distributions of hydrodynamic pressure in the gap of slide journal bearing lubricated with ferro-oil
Autorzy:
Frycz, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/247084.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
temperature distribution
journal slide bearing
ferro-oil
Opis:
This research work is part of a broader comprehensive issue, which is the analysis of flow and operating parameters of journal slide bearings lubricated with ferro-oil. In this article, the author presents only the main assumptions and essential transformations of the analytical and numerical model for determining the pressure distributions in the gap of a slide journal bearing lubricated with ferro-oil. It is cardinal that the rheological and magnetic values of ferro-oil parameters adopted in numerical calculations are based on the results of actual values obtained in the author’s earlier research work. There are presented the pressure distributions by abovementioned method in the article for cases of bearings lubricated with ferro-oils with different concentration of magnetic particles. The obtained results are shown in the form of a set of four complementary characteristics of the dimensionless pressure distributions. First and main of them are the calculations for classical Newtonian lubrication but they take into account the influence of the magnetic field on the distributions. The next of the presented characteristics are so-called "corrections" of pressure distribution values, taking into account as follows: effects of changes in ferro-oil viscosity related to temperature changes, impacts of ferro-oil viscosity changes related to pressure changes and the effect of non-oil properties of the lubricant. The article includes a qualitative and quantitative analysis of the obtained results as well as observations and conclusions are presented in it.
Źródło:
Journal of KONES; 2019, 26, 4; 53-61
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical thermal analysis of a car braking system
Autorzy:
Różyło, P.
Powiązania:
https://bibliotekanauki.pl/articles/102377.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
Abaqus
braking system
numerical analysis
temperature distribution
Opis:
The study involved performing a numerical thermal analysis of selected components in a car braking system. The primary goal of the study was to determine the regions which are most susceptible to variations in temperature, and to determine the degree of thermal impact upon them. The analysis was performed using the Abaqus environment. The examined components of the braking system were made of materials reflecting mechanical properties of the real subassemblies. The FEM analysis enabled determination of the distribution of temperature in the system with respect to the properties of the investigated materials and applied boundary conditions.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 2; 38-43
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat dissipation and temperature distribution in long interconnect lines
Autorzy:
Gnidzińska, K.
Mey, G.
Napieralski, A.
Powiązania:
https://bibliotekanauki.pl/articles/199909.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
interconnect lines
heat dissipation
delay
temperature distribution
Opis:
Thermal and time delay aspects of long interconnect lines have been investigated. To design a modern integrated circuit we need to focus on very long global interconnects in order to achieve the desired frequency and signal synchronization. The long interconnection lines introduce significant time delays and heat generation in the driver transistors. Introducing buffers helps to spread the heat production more homogenously along the line but consumes extra power and chip area. To ensure the functionality of the circuit, it is compulsory to give priority to the time delay aspect and then the optimized solution is found by making the power dissipation as homogenous as possible and consequently the temperature distribution T (relative to ambient) as low as possible. The technology used for simulations is 65 nm node. The occurring phenomena have been described in a quantitative and qualitative way.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 1; 119-124
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numeryczna symulacja termicznej identyfikacji porowatości gazowej i wtrąceń w stopach aluminium
Numerical simulation of thermal identification of gas porosity and inclusions in aluminum alloys
Autorzy:
Madej, J.
Dudyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/386362.pdf
Data publikacji:
2010
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
odlewanie
aluminium
rozkład temperatury
foundation
temperature distribution
Opis:
W pracy omówiono wyniki symulacji numerycznych, przedstawiających rozkład temperatury w kokilowych odlewach aluminiowych w momencie zalewania formy i we wczesnym okresie stygnięcia odlewu. Szczególną uwagę zwrócono na wpływ zagazowania odlewu i obecności obcych wtrąceń na rozkład temperatury na powierzchni metalu, stygnącego w kokili stalowej. Zbadano również możliwość zlokalizowania defektów wewnętrznych poprzez analizę rozkładu temperatu- ry na powierzchni odlewu, poddanej działaniu krótkotrwałego impulsu cieplnego. Analizując rozkład temperatury badanej powierzchni odlewu zaobserwowano zmiany przewodnictwa cieplnego materiału spowodowane obecnością defektów wewnętrznych. Zmiany te zobrazowane na załączonych termogramach i termoprofilach pozwalają na jednoznaczną lokalizację obszarów występowania defektów. Uzyskane wyniki potwierdzają efektywność termicznej metody lokalizowania stref potencjalnych defektów w stopach bezpośrednio po zalaniu formy oraz diagnozowania wad w gotowych odlewach.
The paper presents the results of numerical simulations showing temperature distribution in the mould aluminum casting during the pouring mould and in the early phase of self-cooling of the casting. Special attention was devoted to the influence of gas pores and inclusions on the temperature distribution on the casting surface during self-cooling in steel mould. A possi- bility of locating inner defects by means of analysis of distribution of temperature on the casting surface submitted with short thermal impulse was investigated. Changes of thermal conductance caused by the presence of inner defects were observed by analyz- ing the temperature distribution on the casting surface. These changes presented on the included thermographs and thermo profiles enable to unequivocally locate the regions containing defects. The results achieved confirm the effectiveness of the thermal method for locating potential defect regions in alloys directly after the pouring into moulds and for diagnosing the defects in ready castings.
Źródło:
Acta Mechanica et Automatica; 2010, 4, 1; 66-71
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method for modelling temperature distribution in exhaust system of diesel engine in the light of mine systems of heat recuperation
Autorzy:
Chuchnowski, W.
Tokarczyk, J.
Stankiewicz, K.
Woszczyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/242169.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
recuperation
diesel engine
Peltier's cell
temperature distribution
CFD
Opis:
Analysis of temperature distribution and heat flow in the exhaust system of diesel engine to determine technical parameters of the system for heat recuperation and changing of thermal energy into electric energy was presented. Temperature of exhaust gases as well as geometrical and material features of exhaust system were the input data accepted for modelling. Computational Fluid Dynamics (CFD) was used to determine temperature distribution in the exhaust system. The software by use numerical methods finite volume method) enables solving partial differential equations consisting of equations of: continuity, Navier-Stokes, Fourier-Kirchoff and complemented with other equations important as regards the discussed phenomenon (e.g. with turbulences models)transforming them in the algebraic equations or common differential equations. CFD software enables gaining some information as regards flow rate, distribution of speed field, and pressure field as well as heat flow, temperature field and mass field. Design and principle of operation of Peltier 's cell, model of recuperator, exhaust system, and diesel engine, finite elements meshing, boundary conditions assumed in analysis of exhaust gases and water flow, distribution of temperature field (maximal temperature of scale 335 K and maximal temperature of scale 400 K) on external wall of exhaust system and cross-section of exhaust system are presented in the paper.
Źródło:
Journal of KONES; 2011, 18, 2; 101-108
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie dokładności odwzorowania obiektów na podstawie stereopary zdjęć termograficznych
Autorzy:
Wróbel, A.
Powiązania:
https://bibliotekanauki.pl/articles/131056.pdf
Data publikacji:
2002
Wydawca:
Stowarzyszenie Geodetów Polskich
Tematy:
obraz termograficzny
temperatura powierzchni
rozkład temperatury
thermogram
surface temperature
temperature distribution
Opis:
Obraz termo graficzny ukazuje rozkład temperatury powierzchni obiektu. Jeśli obiekt ma zróżnicowaną temperaturą to obserwacja stereoskopowa obrazów termograficznych powinna umożliwić utworzenie przestrzennego obrazu tego obiektu. Pomogłoby to w identyfikacji elementów obiektu, a zatem ułatwiłoby interpretacją termogramów. Umożliwiłoby również uzyskiwanie bezpośrednio z termogramów geometrii rozkładu temperatury bez konieczności dodatkowych pomiarów fotogrametrycznych. Rozkład temperatury na powierzchni obiektu ma charakter ciągły. Powoduje to rozmycie szczegółów na termogramie, co w porównaniu do obrazów w paśmie widzialnym, zwiększa błąd pomiaru wybranych punktów obiektu.
Źródło:
Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2002, 12; 360-365
2083-2214
2391-9477
Pojawia się w:
Archiwum Fotogrametrii, Kartografii i Teledetekcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Półempiryczne równanie opisujące naturalne pole temperatury gruntu w rejonie Białegostoku
Semi-empirical formula for the natural ground temperature distribution in Bialystok city region
Autorzy:
Biernacka, B.
Powiązania:
https://bibliotekanauki.pl/articles/402831.pdf
Data publikacji:
2010
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
rozkład temperatury
podłoże gruntowe
temperatura gruntu
temperature distribution
ground
ground temperature
Opis:
W artykule przedstawiono wyniki pomiarów naturalnego rozkładu temperatury w podłożu gruntowym od stycznia 2000 do grudnia 2006 r. Badania wykonano w Białymstoku, na dwu stanowiskach różniących się rodzajem powierzchni gruntu. Temperaturę mierzono za pomocą termopar rozmieszczonych na głębokościach od 0 do 5 metrów pod trawnikiem i od 0 do 9,5 m pod parkingiem. Celem prezentowanych badań było określenie na drodze doświadczalnej rozkładów temperatury i określenie półempirycznego równania do obliczania temperatury gruntu na dowolnej głębokości i w określonym dniu cyklu rocznego.
In this paper, temperature distributions measured in the ground since the start of 2000 to the end of 2006 are reported. The measurements were done in Bialystok City region for two differently covered ground surface locations. Temperature was measured with thermocouples distributed in the ground at a depth from 0 to 5 m (lawn) and from 0 to 9,5 m (car park). The semi-empirical formula presented in this paper, describes the temperature distributions in the undisturbed ground for Bialystok City region.
Źródło:
Budownictwo i Inżynieria Środowiska; 2010, 1, 1; 5-9
2081-3279
Pojawia się w:
Budownictwo i Inżynieria Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental values of temperature distribution in a sliding bearing sleeve lubricated with non-Newtonian oils
Autorzy:
Miszczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/259545.pdf
Data publikacji:
2005
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ferro-oil
non-Newtonian oil
temperature distribution
test stand
Opis:
This paper presents results of experimental investigations of temperature distributions on inner surface of a sleeve of transverse sliding bearing lubricated with non-Newtonian oils. The measurements were performed by means of Pt100 miniature sensors placed close to internal surface of the sleeve. To measure sleeve temperature distributions use was made of a test stand installed at Gdynia Maritime University. Delo 1000 Marine 30 oil, SAE 15W40 basic oil, and aferro-oil made of the SAE 15W40 basic oil were used as a lubricating medium. During measuring temperature distributions for the ferro-oil different intensity values of external magnetic field generated by electromagnets were applied.
Źródło:
Polish Maritime Research; 2005, 3; 16-26
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bench Tests for Exhaust Gas Temperature Distribution in an Aircraft Piston Engine with and without a Turbocharger
Autorzy:
Czarnigowski, Jacek Andrzej
Skiba, Krzysztof
Rękas, Daniel
Ścisłowski, Karol
Jakliński, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2123277.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
temperature distribution
piston engine
exhaust system
turbocharging
Rotax 912
Opis:
In ultralight aviation, a very important engine parameter is the power-to-weight ratio. On the one hand, there is a tendency to minimize the size and weight of engines, and on the other hand, there is a demand to achieve the highest possible power by using supercharging systems. Increasing power brings many benefits, but it also increases temperature in the exhaust system, posing a threat to delicate parts of the ultralight aircraft fuselage. Therefore, it is necessary to control temperature values in the engine exhaust system. This article presents the temperature distribution in the exhaust system of an aircraft engine by the example of a four-cylinder Rotax 912 engine with an electronic fuel injection system. The research was conducted in two stages: measurements were made first for the engine without a turbocharger with an original exhaust system and later for its modified version with an added turbocharger system. The paper presents a comparative analysis of exhaust gas temperatures measured at three points: 30, 180 and 1000 mm from the cylinder head. The tests were conducted for the same preset engine operating conditions at constant speed and manifold air pressure. It has been shown that the exhaust temperature in the exhaust manifold decreases with the distance from the cylinder head. The highest gradient, over three times higher than the gas temperature from 589.9 °C to 192.3 °C, occurred in the manifold with a turbocharger for 2603 RPM and 31 kPa of manifold air pressure. The introduction of turbocharging causes an increase in exhaust gas temperatures before the turbocharger by an average of 12%, with this increase being greater for operating points of higher inlet manifold pressure. Turbocharging also causes a significant decrease in exhaust gas temperatures behind the turbocharger and the silencer because the temperature drops there by an average of 25%.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 3; 155--166
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of irrigation interval on temperature distribution in soil profile under solarization applications in greenhouses
Autorzy:
Oz, H.
Coskan, A.
Atilgan, A.
Powiązania:
https://bibliotekanauki.pl/articles/60596.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
irrigation interval
temperature distribution
soil profile
solarization
greenhouse
irrigation
Opis:
The aim of soil solarization is to control soil borne pathogens and weeds heating with solar energy of soil which is sufficiently wetted. Soil water content is the one of the most important factors affecting soil solarization. Humidity level is important to convey temperature from the upper layers to down layers of soil in solarized soil. For this purpose, the study was conducted in plastic greenhouse in Isparta province. Beginning of the study, all plots were irrigated to reach the field capacity, and then the all plots were irrigated in 5 days irrigation interval during the experiment periods. Temperature distribution was measured in 5, 10, 20 and 30 cm of the soil profile along the experiment periods. As a result of this study, increasing of soil temperature and effectiveness of solarization decreased with together the water content of soil in upper layers. However, the soil temperature increased with irrigation in the down layers.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2013, 1/III
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of terrain relief, buildings, and green spaces in the diversification of Lvivs local climate
Autorzy:
Mucha, Bohdan
Wawer, Jolanta
Janicki, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2034133.pdf
Data publikacji:
2010-06-01
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
air temperature
temperature variation
urban heat island
vertical temperature gradient
temperature distribution map
Lviv
Opis:
This paper outlines the results of a study of Lviv's specific thermal characteristics. The study relied on a series of measurements taken over a 15-month period (from February 2007, through April 2008) at 6 automatic meteorological stations, representing a variety of physiogeographic conditions and land use. The study reveals substantial variations of temperature levels (annual [1-3°C], seasonal [2-4°C], and daily [2-12°C] averages), indicating the presence of an urban heat island. The result of the study is a map of the distribution of average annual air temperatures on the territory of Lviv.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2010, 14; 111-119
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania symulacyjne obciążeń termicznych hamulca tarczowego
Simulation studies of thermal loads of disc brake
Autorzy:
Chomka, G.
Chudy, J.
Tutkaj, K.
Powiązania:
https://bibliotekanauki.pl/articles/316007.pdf
Data publikacji:
2017
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
rozkład temperatury
symulacja
hamulec tarczowy
temperature distribution
simulation
disc brake
Opis:
W artykule przedstawiono sposób utworzenia modeli geometrycznych oraz opisano przebieg przeprowadzenia dyskretyzacji i ustalenia warunków brzegowych niezbędnych do badań symulacyjnych. Wyniki badań pozwalają określić rozkład obciążeń termicznych występujących w tarczy pełnej oraz wentylowanej, a także w klockach hamulcowych.
The article presents the creation of geometric models and describes the course of discretization and establishment of boundary conditions necessary for simulation tests. The results of the study allow to determine the distribution of thermal loads occurring in the full and ventilated disc, as well as in brake pads.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 7-8; 292-295
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
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