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Wyszukujesz frazę "thermal expansion" wg kryterium: Temat


Tytuł:
Coefficient of thermal expansion as a component quality estimation of alloys on pistons of combustion engines
Autorzy:
Sieminska, B.
Powiązania:
https://bibliotekanauki.pl/articles/245892.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engines
engine pistons
thermal expansion
coefficient of thermal expansion
Opis:
The aim of realized works in the area of materials on pistons is: low thermal expansion, small differences of coefficient of thermal expansion between heating and cooling, high stiffness at elevated temperatures, high hardness and wear resistance. Changes in thermal expansion coefficient during heating and cooling may be very large, as well as during subsequent cycles of heating and cooling of an internal combustion engine pis ton with respect to standard silumin alloys usedfor pistons of internal combustion engines. The paper presents: coefficient of linear expansion a for the AlSi standard alloy, coefficient of linear expansion a for the AlSi alloy with the apositive differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the a negative differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the apositive and negative differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the apositive, negative and positive differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the very small a differences between cooling and heating, coefficient relative elongation as afunction of temperature with the positive elongation differences between cooling and heating, coefficient relative elongation with the very small elongation differences between cooling and heating, coefficient the course of derivative as a function of temperature (T) during heating and cooling with the positive elongation differences.
Źródło:
Journal of KONES; 2009, 16, 4; 575-583
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing contraction and thermal expansion coefficient of construction and moulding polymer composites
Autorzy:
Pyrzowski, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/259644.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
polymer composites
contraction
thermal expansion
Opis:
The paper presents results of systematic tests of contraction and thermal expansion coefficients of materials based on polymer composites. The information on the above material properties is essential both at the design stage and during the use of finished products. Components for the samples were selected in such a way as to represent typical materials used for production of construction and moulding elements. The performed tests made it possible to monitor the analysed parameters at different stages of the technological process.
Źródło:
Polish Maritime Research; 2018, S 1; 151-158
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wilgotności powietrza na wielkości decydujące o jakości produktu w procesie termicznego ekspandowania nasion w strumieniu gorącego powietrza
Influence of air humidity on values that decide of product quality in thermal expansion of seeds in a hot air stream
Autorzy:
Konopko, H.
Powiązania:
https://bibliotekanauki.pl/articles/290725.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
ekspandowanie termiczne
nasiona
thermal expansion
seeds
Opis:
W pracy przedstawiono wyniki symulacji komputerowej procesu termicznego ekspandowania nasion prosa w przewodzie pneumatycznym. Świadczą one o znaczącym wpływie początkowej wilgotności nasion na podstawowe parametry procesu.
The study presents the results of computer simulation of the process of thermal expansion of millet seeds in a pneumatic conduit. It shows a considerable influence of initial seed moistness on basic process parameters.
Źródło:
Inżynieria Rolnicza; 2006, R. 10, nr 7(82), 7(82); 269-275
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermophysical properties of selected vermicular graphite cast iron alloy
Autorzy:
Homa, M.
Sobczak, N.
Turalska, P.
Bruzda, G.
Bacior, M.
Warmuzek, M.
Polkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/391848.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
vermicular cast iron
thermophysical properties
transformation temperatures
melting heat
thermal expansion
thermal expansion coefficient
thermal diffusivity
thermal conductivity
Opis:
The paper presents the results of thermophysical properties of selected vermicular graphite cast iron with nominal chemical composition of 3.70 C; 2.30 Si; 0.44 Mn; 0.054 P; 0.015 S; 0.017 Mg (wt. %). The comparative studies of the alloy were performed using differential scanning calorimetry, dilatometry and laser flash analysis. The calorimetric investigations proved that upon the heating to melting temperature (~1200°C), four endothermic transformations take place: 1) ferromagnetic → paramagnetic at 742°C, 2) pearlite → austenite at 824.2°C, 3) allotropic transformation of bcc ferrite to fcc austenite at 802°C, 4) melting at 1173.1°C. The character of the dilatometric curve shows small deviation at the temperature above 810°C corresponding to the pearlite → austenite transformation. The values of thermal diffusivity and thermal conductivity change throughout the entire examined temperature range. Both curves showed a changeover from negative to positive trends between 700 and 800°C. This effect might be associated with the pearlite → austenite transformation.
Źródło:
Prace Instytutu Odlewnictwa; 2017, 57, 4; 345-350
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wilgotności powietrza na wymianę ciepła w procesie termicznego ekspandowania nasion w strumieniu gorącego powietrza
Influence of air humidity on heat exchange in the process of thermal expansion of sedes in a stream of hot air
Autorzy:
Konopko, H.
Powiązania:
https://bibliotekanauki.pl/articles/290727.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
ekspandowanie termiczne
nasiona
thermal expansion
seeds
Opis:
W pracy przedstawiono wyniki symulacji komputerowej procesu termicznego ekspandowania nasion prosa w przewodzie pneumatycznym. Świadczą one o znaczącym wpływie początkowej wilgotności nasion na wymianę ciepła w tym procesie.
The study presents the results of computer simulation of the process of thermal expansion of millet seeds in a pneumatic conduit. It shows a considerable influence of initial seed moistness on basic process parameters.
Źródło:
Inżynieria Rolnicza; 2006, R. 10, nr 7(82), 7(82); 263-268
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and research of piston working conditions of combustion engine in high thermal load conditions
Autorzy:
Jankowska-Sieminska, B.
Jankowski, A.
Slezak, M.
Powiązania:
https://bibliotekanauki.pl/articles/243400.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
piston
thermal load
thermal expansion
thermal shock
Opis:
Explanation of phenomena occurring in pistons of combustion engines which appear during heating and cooling processes in reference to standard materials and composite materials of high material proprieties is aim of the paper. Bring over researches were mostly directed on measurements of difference dimensions which appear during the piston work in the combustion engine. The paper concentrates on phenomenon of different proprieties of materials. The thermal stresses and shocks differ. In the thermal shock, thermal stresses are caused by instantaneous temperature gradients which appear at high engine speed. These stresses are determined thro temperature distribution and they do not differ from stresses in steady-state conditions. Researches concerning thermal expansions were performed by means of sensitive dilatometer which can work in simple and differential system. Changes of dimensions versus temperature function were measured with inductive sensor and the sensitive Pt-ptrh thermocouple, and results were referred to reference material-Platinum. Research results are illustrated on diagrams of different courses of changes of the of thermal expansion coefficient during heating and cooling of standard and composite materials. Values of the thermal expansion coefficient a for the heating and cooling are smaller for composite alloys. The course of the coefficient â during cooling can be higher or lower from the coefficient a during heating. Similar values were also received. Maximum differences were of 10%. Smaller values of the coefficient a for composite alloys cause that for such the same thermal loads temperature gradients will be smaller for composite alloys. Courses of changes of the coefficient â have a different characteristics suited from chemical composition of alloy, granularity of the composite component and thermal treatment.
Źródło:
Journal of KONES; 2007, 14, 3; 233-243
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary research no vel composite materials with small hysteresis and high functional parameters for combustion engines pistons
Autorzy:
Siemińska-Jankowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/246073.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engines
engine pistons
thermal expansion
hysteresis
Opis:
Pistons of internal-combustion engines are the most loaded elements of internal-combustion engines, belong to these specialistic elements, which have essential influence on the ecological properties of engines, their durability and reliability. The object of paper is pistons manufactured from the standard material and from new research alloy. The investigations were performed with dilatometer permitting on the registration of changes of the dimensions of sample in the function of temperature and time. The measurements are possible in straight system and in differential system. Exemplary results of investigations are presented in the paper. During the piston heating, period preutectic phases succumb the partial dissolution in solid solution a, but in the cooling process they secrete again. As a consequence the piston partial deformation occurs, which by result is gradual growth of difference between its expansibility during the warming and contraction in the process of cooling (so-called hysteresis occurs). The characteristics of the new piston silumin alloys give possibility of dearances minimalization and the obtainments of a correct engine performance in the full range of engine rotational velocities and loads. The effect are the decrease of the oil expenditure, the decrease of the emission of hydrocarbons in exhaust gases, the decrease of blowbys to crankcase, the decrease of the expenditure of piston rings grooves wear and the piston skirt wear, the decrease of the piston deformation and the increase of engine durability and reliability.
Źródło:
Journal of KONES; 2009, 16, 1; 447-452
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Expansion of ZrO2-20 mol% Gd2O3
Autorzy:
Kang, Kweonho
Hong, Seok-Min
Lee, Changhwa
Cho, Yongjun
Powiązania:
https://bibliotekanauki.pl/articles/2125531.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ZrO2-20 mol% Gd2O3 pellet
thermal expansion
thermal expansion coefficient
density
thermo-mechanical analyzer
Opis:
The thermal expansion of a ZrO2-20 mol% Gd2O3 pellet has been systematically investigated using a thermo-mechanical analyzer in the temperature range of 293-1773 K. Variations in the thermal expansion coefficient and density upon temperature change were calculated using the thermal expansion data. The average linear thermal expansion coefficient of theZrO2-20 mol% Gd2O3 pellet was found to be 9.522 × 10-6 K-1 in the range of 298-1073 K. This value is smaller than that of ZrO2 and larger than that of Gd2O3. Further, with an increase in temperature to 1773 K, the density of ZrO2-20 mol% Gd2O3 pellet was found to decrease to 94.98 % of the initial density at 293 K.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 909--912
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza możliwości pomiarów rozszerzalności liniowej kompozytów o dużej przewodności cieplnej z wykorzystaniem metod analitycznych
Analysis of possibility of lineat expansion measurements on composites of high thermal conductivity using analytical methods
Autorzy:
Dul, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/2164929.pdf
Data publikacji:
2013-12-15
Wydawca:
Ostrołęckie Towarzystwo Naukowe
Tematy:
rozszerzalność cieplna
liniowy współczynnik rozszerzalności
cieplnej
metody analityczne
kompozyty
thermal expansion
linear coefficient of thermal expansion
analytical
methods
composites
Opis:
Przedmiotem opracowania jest analiza możliwości pomiarów rozszerzalności liniowej kompozytów o dużej przewodności cieplnej z wykorzystaniem metod analitycznych. W pierwszej części analizy przedstawiony został liniowy współczynnik rozszerzalności cieplnej, w tym również w odniesieniu do materiałów kompozytowych o dużym współczynniku przewodzenia ciepła. Następnie w pracy zaprezentowano szereg metod analizy rozszerzalności liniowej dla kompozytów, w tym o dużej przewodności cieplnej. Opracowanie zawiera bardzo szeroki zakres przedstawionych metod, co może być bardzo cenne z punktu widzenia osób lub ośrodków zainteresowanych badaniem rozszerzalności liniowej, w szczególności kompozytów o dużej przewodności cieplnej.
The purpose of the study is analysis of possibility of linear expansion measurements on composites of high thermal conductivity using analytical methods. First part of the analysis presents the linear coefficient of thermal expansion, also in relation to composite materials with high thermal conductivity. Then, the paper presents, a number of analytic methods of analysis of linear expansion of composites, also with a high thermal conductivity. The study contains a very wide range of presented methods, which can be very valuable in terms of scientists or institutions interested in the study of linear expansion, in particular composites with high thermal conductivity.
Źródło:
Zeszyty Naukowe Ostrołęckiego Towarzystwa Naukowego; 2013, Zeszyt, XXVII; 244-259
0860-9608
Pojawia się w:
Zeszyty Naukowe Ostrołęckiego Towarzystwa Naukowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research results of novel composite materials with low hysteresis during heating and cooling for pistons of combustion engines
Autorzy:
Sieminska, B.
Powiązania:
https://bibliotekanauki.pl/articles/245037.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
internal combustion engines
engine piston
thermal expansion
emissions
Opis:
Research results of novel silumins on pistons for combustion engines, which have high mechanical properties within the range of piston higher operating temperatures, 100-300°C, are presented in the paper. Silumins contain enlarging concentration of the nickel and copper alloy additives up to 4.0, and chrome and molybdenum alloy additives up to 1.0%. Occurrence of given microstructure in piston-silumins results in almost the same values of the coefficient thermal expansion during the heating up to the 300 °C temperature and during the next cooling into the ambient temperature. Small values of the coefficient of expansion of thermal and small differences between values of the coefficient of thermal expansion during heating and cooling enable on application of small values of working clearances between piston and the cylinder liner. As a consequence they make possible, the low exhaust emission level, and the low noise level. The pistons from alloys with small values ofthe coefficient of thermal expansion, small differences of this coefficient during heating and cooling are novel aspects presented in paper. Research results of strength and metallographic parameters, research results of the coefficient of thermal expansion, comparative engine research results are represented in the paper. In particular representative chemical components for a standard alloy and novel alloy, mechanical properties investigated alloys after solution heat treatment, wear resistance of novel alloy compared with two cast irons, ATD curves, fibrous construction, silicon construction, microstructure of novel alloy, courses of changes of the coefficient of thermal expansion in the function of the temperature during heating and cooling are presented in the paper.
Źródło:
Journal of KONES; 2010, 17, 1; 421-432
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Lab-scale HVAC Hissing-type Noise and Vibration Characterization with Vehicle System Validation
Autorzy:
Satar, Mohd Hafiz Abdul
Mazlan, Ahmad Zhafran Ahmad
Hamdan, Muhd Hidayat
Isa, Mohd Syazwan Md
Paiman, Muhd Abdul Rahman
Ghapar, Mohd Zukhairi Abd
Powiązania:
https://bibliotekanauki.pl/articles/1953472.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
hissing noise
HVAC system
vibration
evaporator
thermal expansion valve
Opis:
Heating, ventilation and air conditional (HVAC) system provides a cold ventilation for the comfort of the driver and passengers in a vehicle. However, the vibration induced by the HVAC contributes to a reasonable level of noise emission, and hissing is one of the critical noises. So far, the characterization of hissing noise from the vehicle is least to be reported compared to other type of noises. Hence, this paper investigates the occurrence of hissing noise from several HVAC components. A lab-scale HVAC system was developed to imitate the real-time operations of the vehicle HVAC system. Two engine conditions, namely as ambient and operating conditions, were tested at speed of 850 rpm and 850-1400 rpm, with the blower speed maintained constantly at one level. The result shows that the hissing noise from the labscale HVAC was produced at frequency range of 4000-6000 Hz. The finding also highlights that the main component contributors of noise emission are an evaporator and a thermal expansion valve. The validation with a real vehicle system showed a good consensus whereby the hissing noise was produced at the similar operating frequency ranges. Also, the hissing noise was found to be louder when in an operating condition which could be taken into consideration by the vehicle manufacturers to improve the HVAC design.
Źródło:
Archives of Acoustics; 2021, 46, 2; 365-373
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Researches novel materials on the pistons with low hysteresis to combustion engines
Autorzy:
Sieminska, B.
Slawinski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/243012.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engines
engine pistons
composite alloy
thermal expansion
hysteresis
Opis:
The researches were carried out at the use of the precise dilatometer of the firm BAHR 802/801. The device makes possible the registration of changes of measurements of the sample in the function of the temperature. Measurements in the simpler and differential are possible. Heating and cooling is performed in the special device, which realizes the programme temperature, controlled computer. Changes of dimensions are measured with an inductive sensor. Samples were placed in the quartz-pipe and changes of their length were transferred by quartz-rods. The temperature of tested material was measured by means of the Pt-PtRh thermocouple. Material on the pistons has a fundamental meaning for the value of the clearances between the cylinder and the piston. Too small clearness between the piston and cylinder on the cold engine cannot be applying, because during the work of an engine it would be able to occur seizing of an engine. From here, also the large resistance on seizing of material of the piston is essential. Investigated composite materials performed based on piston-silumins AK12 and AK18 in which a composite addition was silicon carbide (SiC) and ferric sulphide (FeS).
Źródło:
Journal of KONES; 2012, 19, 4; 549-554
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extension of a phase transformation model for partial hardening in hot stamping
Autorzy:
Hart-Rawung, T.
Buhl, J.
Bambach, M.
Powiązania:
https://bibliotekanauki.pl/articles/99913.pdf
Data publikacji:
2018
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
coefficient of thermal expansion
phase transformation model
hot stamping
Opis:
The quality of predicted microstructural and mechanical properties in hot stamping simulations relies considerably on the material model. Many researchers studied the effect of the plastic deformation on the phase transformation of the most commonly used hot stamping steel 22MnB5, and proved that the deformation applied at high temperature promotes the formation of ferrite, pearlite and bainite. This behaviour has to be integrated into materials modelling. In this study, the effect of pre-strain on the phase transformation of the material is considered. The specimens are heated to austenitization temperature, isothermally deformed at 700°C, and quenched down to room temperature. The phase fractions and the temperature-dilatation behaviour obtained from the experiments are used to calibrate the material model. By using the experimental data obtained from dilatometer testing, the accuracy of the material model is evaluated. Additionally, an attempt to predict the results between the tested data points by using interpolation was made and compared with the simulation results.
Źródło:
Journal of Machine Engineering; 2018, 18, 3; 87-97
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ temperatury na ciśnienie w oponach samochodów ciężarowych
The influence of temperature on the pressure in tires of lorries
Autorzy:
Kotyk, M.
Troszyński, A.
Powiązania:
https://bibliotekanauki.pl/articles/95448.pdf
Data publikacji:
2013
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
Tematy:
ciśnienie
azot
powietrze
rozszerzalność cieplna
pressure
nitrogen
air
thermal expansion
Opis:
W pracy opisano wpływ temperatury powietrza oraz temperatury azotu na ciśnienie w oponach samochodów ciężarowych. Prawidłowe ciśnienie w oponie samochodu ciężarowego pozwala na zapewnienie komfortu oraz bezpieczeństwa podczas jazdy. Zbadano, jaki wpływ na zachowanie prawidłowego ciśnienia w oponie ma temperatura. Po to, aby uzyskać pewne porównanie, oponę samochodu ciężarowego napełniono najpierw powietrzem, a następnie azotem i wystawiono ją na działanie niskich temperatur.
The article concerns the research on the influence of the air and azote temperature on the pressure in the tyres of the lorries. A normal pressure in the tire of a lorry allows to ensure the driving comfort and safety. It has been studied the influence which the temperature has on the keeping the normal pressure in the tire. In order to achieve the plausible comparison, the tire of a lorry has been filled up first with the air and then with the azote and it has been exposed to the low temperatures.
Źródło:
Postępy w Inżynierii Mechanicznej; 2013, 2(1); 31-39
2300-3383
Pojawia się w:
Postępy w Inżynierii Mechanicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-quality silumin on pistons of combustion engines
Autorzy:
Jankowski, A.
Pietrowski, S.
Sieminska, B.
Szymczak, T.
Powiązania:
https://bibliotekanauki.pl/articles/245889.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engines
piston
composite alloys
heat treatment
thermal expansion
hysteresis
Opis:
In the paper the test results are presented for the AlSH2Cu5Ni5MgO.5CrO.05MoO.05WO.05VO.05 newly worked out silumin close to eutectic piston-silumin with the elevated content ofcopper and nickel to approx. 5% with relation to generally applied the AISH2 piston silumin. The novel silumin contains also Cr, Mo, In and V micro alloy additions in quantity approx. 0.05 percent for every element. Research of microstructure, HB hardness and coefficient of lineal thermal expansion a for the AlSil2Cu5Ni5MgO.5CrO.05MoO.05WO.05VO.05 silumin in the cast state, after the separation strengthening and additional short duration high-temperature heat-treatment were performed. Research of the microstructure of the AlSH2Cu5Ni5MgO.5CrO.05MoO.05WO.05VO.05 silumin showed the occurrence in it following constituent phases: alfa(Al), beta(Si), Al2Cu and AlMoCrWVMgNiSiCuFe. The separation strengthening brought about the coagulation of silicon emissions. The short duration high-temperature heat-treatment caused additional coagulation of silicon emissions and also its coalescence. Measurement of the HB hardness showed high hardness investigated alloy in the rough state, approx. 30% higher from the AlSi2 piston silumin. Measurement of the a coefficient of thermal expansion showed beneficial effects of novel alloy connected with the value decreasing of this coefficient as well so called hysteresis. Further studies on novel alloy will concentrate on alloy-additional and processes of the heat treatment.
Źródło:
Journal of KONES; 2009, 16, 4; 563-573
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł

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