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    Wyświetlanie 1-6 z 6
    Tytuł:
    Influence of the slipe effect on simply supported composite beam
    Autorzy:
    Pytlowany, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/115768.pdf
    Data publikacji:
    2012
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    slip effect
    composite beams
    simply supported beam
    Opis:
    The work concerns the slip effect which may occur in simply supported composite beams. The occurrence of the slip effect may lead to additional increase in beam deflection. The main reason for the increase is susceptibility of the anchor bolts that join the beam. The analysis of the slip effect occurrence is based on the following criteria: steel and concrete are linearly elastic, junction goes along the whole length of the considered beam, concrete slab and steel rib move by the same value along the whole length of the beam, simply supported beams are analysed. In order to present the slip effect in composite beams and its results, a numerical example is used. The example shows three kinds of the load capacity of anchor bolts as well as their impact on the slip effect and deflection of steel-concrete composite beams.
    Źródło:
    Challenges of Modern Technology; 2012, 3, 2; 44-49
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Slip effects on squeezing flow of nanofluid between two parallel disks
    Autorzy:
    Das, K.
    Jana, S.
    Acharya, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/264490.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    pole magnetyczne
    tarcie
    poślizg
    nanofluid
    slip effect
    squeezing flow
    magnetic field
    Opis:
    In this study, the influence of temperature and wall slip conditions on the unsteady flow of a viscous, incompressible and electrically conducting nanofluid squeezed between two parallel disks in the presence of an applied magnetic field is investigated numerically. Using the similarity transformation, the governing coupled partial differential equations are transformed into similarity non-linear ordinary differential equations which are solved numerically using the Nachtsheim and Swigert shooting iteration technique together with the sixth order Runge-Kutta integration scheme. The effects of various emerging parameters on the flow characteristics are determined and discussed in detail. To check the reliability of the method, the numerical results for the skin friction coefficient and Nusselt number in the absence of slip conditions are compared with the results reported by the predecessors and an excellent agreement is observed between the two sets of results.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 5-20
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Boundary layer flow of magneto-micropolar nanofluid flow with Hall and ion-slip effects using variable thermal diffusivity
    Autorzy:
    Bilal, M.
    Hussain, S.
    Sagheer, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/202030.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Hall effect
    nanofluid
    ion-slip effect
    magneto-micropolar fluid
    shooting method
    Efekt Halla
    płyn mikropolarny
    Opis:
    In the present article, magneto-micropolar nanofluid flow with suction or injection in a porous medium over a stretching sheet for the heat and mass transfer is analyzed numerically. Both Hall and ion-slip effects are considered along with variable thermal diffusivity. The governing partial differential equations are transformed to ordinary differential equations using usual similarity transformations. These coupled non-linear differential equations are solved using the shooting method. Effects of prominent parameter on velocities, temperature and concentration are discussed graphically. Numerical values of skin-friction coefficient, local Nusselt number and local Sherwood number are also tabulated and discussed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 3; 383-390
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Instantaneous angular speed: encoder-counter estimation compared with vibration data
    Autorzy:
    Spagnol, M.
    Bregant, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/328776.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    instantaneous angular speed
    encoder
    elapsed time method
    AC DC electrical machine
    slip effect
    Opis:
    In rotating machinery, actions of the moving parts take place at specific angular positions rather than at specific times. For this reason, having a geometrical reference, such as the one provided by an encoder, and studying the Instantaneous Angular Speed (IAS) variations can provide a large amount of information about the health status of the machine. In fact, from the variation of the IAS during the machine loads’ cycle it is possible to identify defects and faults. The current work focuses on the estimation of the IAS through the Elapsed Time (ET) method, using a counter in order to measure the time elapsed between the pulses of an encoder. Both IAS and vibration measurement are conducted on an asynchronous four poles electrical motor driven by 50Hz line current, without load. The study compares the order analysis of both signals. The bearing’s Fundamental Train Frequency is detected using IAS estimation.
    Źródło:
    Diagnostyka; 2013, 14, 3; 9-13
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charakterystyki reologiczne puree owocowych i warzywnych
    Rheological characteristics of fruit and vegetable puree
    Autorzy:
    Mickiewicz, D.
    Kiljański, T.
    Bomba, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073149.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    poślizg przyścienny
    rozrzedzanie ścinaniem
    purée
    karborund
    slip-wall effect
    shear-thinning
    puree
    carborundum
    Opis:
    Celem pracy było określenie właściwości reologicznych puree owocowych i warzywnych. Do wyznaczenia charakterystyk zastosowano karborundową powierzchnię układu pomiarowego, eliminującą efekt poślizgu przy ściance. Wykazano, że wszystkie badane puree są płynami plastycznolepkimi silnie rozrzedzanymi ścinaniem z małymi granicami płynięcia. Wzrost ścinania powoduje spadek lepkości puree a to redukuje ich tłoczenie w instalacjach przemysłowych.
    The aim of this study was to determine the rheological properties of fruit and vegetable puree. The karborundum surface of measuring system which eliminates the slip-wall effect was applied to determine rheological characteristics. It was shown that all mashed potatoes tested were viscoelastic fluids strongly shear-thinning with low yield stress. The increase of shear stress caused the decrease of puree viscosity and thereby the reduction of stamping in the industrial installation.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2016, 4; 148--149
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Internal mechanism of asymmetric deformation and failure characteristics of the roof for longwall mining of a steeply dipping coal seam
    Autorzy:
    Luo, Shenghu
    Wang, Tong
    Wu, Yongping
    Huangfu, Jingyu
    Zhao, Huatao
    Powiązania:
    https://bibliotekanauki.pl/articles/1853910.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    odkształcenie
    pokłady węgla
    szyb kopalniany
    steeply dipping seam
    gangue
    slip filling
    deformation failure
    main roof
    angle effect
    Opis:
    Stability control of the roof is the key to safe and efficient mining of the longwall working face for a steeply dipping coal seam. In this study, a comprehensive analysis was performed on the roof destruction, migration, and filling characteristics of a steeply dipping longwall working face in an actual coalmine. Elastic foundation theory was used to construct a roof mechanics model; the effect of the coal seam inclination angle on the asymmetric deformation and failure of the roof under the constraint of an unbalanced gangue filling was considered. According to the model, increasing the coal seam angle, thickness of the immediate roof, and length of the working face as well as decreasing the thickness of the coal seam can increase the length of the contact area formed by the caving gangue in the lower area of the slope. Changes to the length of the contact area affect the forces and boundary conditions of the main roof. Increasing the coal seam angle reduces the deformation of the main roof, and the position of peak deflection migrates from the middle of the working face to the upper middle. Meanwhile, the position of the peak rotation angle migrates from the lower area of the working face to the upper area. The peak bending moment decreases continuously, and its position migrates from the headgate T-junction to the tailgate T-junction and then the middle of the working face. Field test results verified the rationality of the mechanics model. These findings reveal the effect of the inclination coal seam angle on roof deformation and failure and provide theoretical guidance for engineering practice.
    Źródło:
    Archives of Mining Sciences; 2021, 66, 1; 101-124
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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