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Wyszukujesz frazę "damping factor" wg kryterium: Temat


Wyświetlanie 1-6 z 6
Tytuł:
Theoretical basis for determining rolling resistance of belt conveyors
Autorzy:
Gładysiewicz, L.
Konieczna, M.
Powiązania:
https://bibliotekanauki.pl/articles/972328.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
rolling resistance
belt
idler
conveyor belt
damping factor
Opis:
Conveyor belts are the most common way of mechanical handling equipment in industry, especially in underground and open-pit mines. Maintenance of conveyor belts generate high costs, there-fore energy savings belts have become popular in recent years. Constant development of continuous transport equipment and looking for savings implies necessary of carrying advanced theoretical research and analysis. In this case determine of indentation rolling resistance is the clue. Based on previous re-search authors suggested new theoretical model of determination rolling resistance. Authors proofed that stress distribution described in time coordinates coexists with lateral deformation of belt. In two dimensional Kelvin–Voigt model it has two components: the particular solution of the differential equation of belt’s model and an general solution (which is typical for harmonic load). In this new model authors included overlooked by others particular solution; that gives a possibility of designating the whole spectrum of changes in the value of the rolling resistance. The obtained results allow to specify new and more accurate damping factor.
Źródło:
Mining Science; 2016, 23; 105-119
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of temperature on the damping characteristic of hydraulic shock absorbers
Autorzy:
Hryciów, Zdzisław
Rybak, Piotr
Gieleta, Roman
Powiązania:
https://bibliotekanauki.pl/articles/1841747.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
hydraulic shock absorber
performance
damping factor
temperature
dissipation energy
Opis:
This paper presents the results of bench-tests and calculations assessing the influence of temperature on the performance of a two-pipe hydraulic shock absorber. The shock absorber prepared for the tests was cooled with dry ice to a temperature corresponding to that associated with the average winter conditions in a temperate climate. The temperature range of the shock absorber during testing was ensured via equipping it with a thermocouple and monitoring it with a thermal imaging camera. During testing, the shock absorber was subjected to kinematic forces of a selected frequency with two different, fixed displacement amplitudes. The results of the tests showed a direct correlation between the decrease of component resistance at lower temperatures. The rate of change in resistance was higher at lower temperatures. It was also found that the energy dissipated in one shock cycle decreased linearly with an increasing temperature. Finally, a method for determining the ideal use temperature of the shock absorber for the assumed operating conditions was also presented.
Źródło:
Eksploatacja i Niezawodność; 2021, 23, 2; 346-351
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Damping Properties and Density of Helmet Liners Made of Expanded Polystyrene (EPS)
Autorzy:
Trzaskalska, M.
Chwastek, R.
Powiązania:
https://bibliotekanauki.pl/articles/2049565.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
expanded PS
ski liners
PS foams
damping factor
bulk density
Opis:
The purpose of the work was to determine the infuence of the bulk density ρz of granules, processing parameters and the density of ski inserts ρw made of expanded polystyrene (EPS) on their damping properties. For this aim liners for ski helmets with 3 different bulk densities were made. Sintering time and sintering pressure were also changed. The percentage damping factor η was determined on the basis of the results obtained in the rebound resilience test. Based on the analysis of the obtained data, it was found that increasing the density of EPS pads ρw increases their damping properties and at the same time contributes to a decrease in elasticity, increase in hardness and brittleness of EPS products.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 339-344
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dobór tłumików wiskotycznych do tłumienia drgań skrętnych wałów korbowych silników spalinowych
The fitting of the viscous dampers to dampen the torsional vibration of the combustion engine’s crank shaft
Autorzy:
Jagiełowicz-Ryznar, C.
Powiązania:
https://bibliotekanauki.pl/articles/315659.pdf
Data publikacji:
2018
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
tłumik wiskotyczny
tłumienie drgań skrętnych
współczynnik tłumienia
viscous damper
damping of torsional vibrations
damping factor
Opis:
W pracy przedstawiono metodę doboru tłumika wiskotycznego na podstawie badania współczynnika tłumienia wiskotycznego tłumika drgań skrętnych. Podstawą metody są pomiary wymuszonych drgań skrętnych wału pomiarowego z tłumikiem na specjalnym stanowisku badawczym. Na podstawie wzoru teoretycznego uwzględniając wyniki pomiarów drgań wyznaczono współczynnik tłumienia.
The method of viscous damper fitting, on the base of damping factor of viscous torsion damper, was presented in this paper. The measurements of forced torsional vibration of measuring shaft with damper, on the special test bench are the basis of the method. According to the theoretical formula, including the results of the vibrations measuring, the damping coefficient was determined.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2018, 19, 6; 482-485, CD
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic mechanical characterization of epoxy composite reinforced with areca nut husk fiber
Autorzy:
Muralidhar, N.
Kaliveeran, Vadivuchezhian
Arumugam, V.
Srinivasula Reddy, I.
Powiązania:
https://bibliotekanauki.pl/articles/139576.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
areca nut husk fiber
dynamic mechanical analysis
storage modulus
loss modulus
elastic modulus
damping factor
Opis:
Natural fiber polymer composites are gaining focus as low cost and light weight composite material due to the availability and ecofriendly nature of the natural fiber. Fiber composites are widely used in civil engineering, marine and aerospace industries where dynamic loads and environmental loads persist. Dynamic analysis of these composites under different loading and environmental conditions is essential before their usage. The present study focuses on the dynamic behavior of areca nut husk reinforced epoxy composites under different loading frequencies (5 Hz, 10 Hz and 15 Hz) and different temperatures (ranging from 28◦C to 120◦C). The effect of loading and temperature on storage modulus, loss modulus and glass transition temperature was analyzed. Increase in storage modulus is observed with increase in loading frequency. The storage modulus decreases with increase in temperature. The glass transition temperature of the composite is determined to be 105◦C. The elastic modulus calculated from the DMA data is compared with three point bending test
Źródło:
Archive of Mechanical Engineering; 2020, LXVII, 1; 57-72
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration condition monitoring of the vertical steel tanks
Autorzy:
Bouraou, N.
Lukianchenko, O.
Tsybulnik, S.
Shevchuk, D.
Powiązania:
https://bibliotekanauki.pl/articles/127953.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
vertical steel tank
numerical analysis
stress
deformation
vibration analysis
damping factor
zbiornik stalowy pionowy
analiza numeryczna
naprężenie
deformacje
analiza wibracji
współczynnik tłumienia
Opis:
This paper presents the results of numerical analysis and physical simulation of the vertical steel tank for usage in the vibration condition monitoring system. For purposes of the numerical analysis the tank is considered as the double steel cylinder consisting of the inner and outside shells. The discrete model of a tank is developed. The estimations of stress and deformation are obtained when the following vertical loads are exerting: weight of the fuel, weight of the tank roof and other structural elements or equipment. The physical model of a tank is used for physical simulation. The impulse responses of this model are measured and analyzed for different levels of tank filling. The methods of Prony and Steiglitz-McBride are used for estimation of the vibration damping factor which depends on the level of tank filling.
Źródło:
Vibrations in Physical Systems; 2016, 27; 55-60
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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