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    Tytuł:
    Experimental Investigation and Multi-Response Optimization in Turning of Incoloy 800H Superalloy
    Autorzy:
    Palanisamy, A.
    Selvaraj, T.
    Sivasankaran, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/356237.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    superalloy
    microstructure
    Taguchi-Grey approach
    mathematical models
    Opis:
    This research work is focused on examining the turning behavior of Incoloy 800H superalloy by varying important cutting parameters. Incoloy 800H is an Iron-Nickel-Chromium based superalloy; it can withstand high temperature (810°C), high oxidization and corrosion resistance. But, it is difficult to turn in conventional machines and hence the present work was carried out and investigated. Experiments were conducted based on the standard L27 orthogonal array using uncoated tungsten inserts. The cutting force components, namely, feed force (Fx), thrust force (Fy) and cutting force (Fz); surface roughness (Ra) and specific cutting pressure (SCPR) were measured as responses and optimized using Taguchi-Grey approach. The main effects plots and analysis of mean (ANOM) were performed to check the effect of turning parameters and their significance on responses of cutting forces in all the direction (FX, FY, FZ), the surface roughness (Ra) and specific cutting pressure (SCPR). The tool wear and machined surfaces were also investigated using white light interferometer and SEM.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1683-1691
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Difference melt model
    Autorzy:
    Kazhikenova, Saule Sh.
    Shaltakov, Sagyndyk N.
    Nussupbekov, Bekbolat R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1845514.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Navier-Stokes equations
    hydrodynamic
    approximations
    mathematical models
    melt
    Opis:
    The basic objective of the research is to construct a difference model of the melt motion. The existence of a solution to the problem is proven in the paper. It is also proven the convergence of the difference problem solution to the original problem solution of the melt motion. The Rothe method is implemented to study the Navier-Stokes equations, which provides the study of the boundary value problems correctness for a viscous incompressible flow both numerically and analytically.
    Źródło:
    Archives of Control Sciences; 2021, 31, 3; 607-627
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Difference melt model
    Autorzy:
    Kazhikenova, Saule Sh.
    Shaltakov, Sagyndyk N.
    Nussupbekov, Bekbolat R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1845525.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Navier-Stokes equations
    hydrodynamic
    approximations
    mathematical models
    melt
    Opis:
    The basic objective of the research is to construct a difference model of the melt motion. The existence of a solution to the problem is proven in the paper. It is also proven the convergence of the difference problem solution to the original problem solution of the melt motion. The Rothe method is implemented to study the Navier-Stokes equations, which provides the study of the boundary value problems correctness for a viscous incompressible flow both numerically and analytically.
    Źródło:
    Archives of Control Sciences; 2021, 31, 3; 607-627
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The unique solvability of stationary and non-stationary incompressible melt models in the case of their linearization
    Autorzy:
    Kazhikenova, Saule Sh.
    Powiązania:
    https://bibliotekanauki.pl/articles/1409389.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Navier-Stockes equations
    hydrodynamic
    approximations
    mathematical models
    incompressible melt
    Opis:
    The article presents ε-approximation of hydrodynamics equations’ stationary model along with the proof of a theorem about existence of a hydrodynamics equations’ strongly generalized solution. It was proved by a theorem on the existence of uniqueness of the hydrodynamics equations’ temperature model’s solution, taking into account energy dissipation. There was implemented the Galerkin method to study the Navier-Stokes equations, which provides the study of the boundary value problems correctness for an incompressible viscous flow both numerically and analytically. Approximations of stationary and non-stationary models of the hydrodynamics equations were constructed by a system of Cauchy-Kovalevsky equations with a small parameter ε. There was developed an algorithm for numerical modelling of the Navier-Stokes equations by the finite difference method.
    Źródło:
    Archives of Control Sciences; 2021, 31, 2; 307-332
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Waviness at dry high-speed face milling of some hard steels
    Autorzy:
    Beşliu-Băncescu, Irina
    Slătineanu, Laurenţiu
    Coteaţă, Margareta
    Powiązania:
    https://bibliotekanauki.pl/articles/2052146.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    waviness
    dry high-speed face milling
    hard steels
    milling parameters
    hardness
    empirical mathematical models
    Opis:
    Waviness is a parameter used to complete information on the machined surface state. There is little scientific and technical information on the influence exerted by the cutting conditions and the workpiece material hardness on the values of some parameters that define the waviness of milled surface. No works have been identified to present such information for dry high-speed face milling applied to hard steel workpieces. A factorial experiment with four independent variables at three variation levels was planned to model the influence of milling speed, feed, cutting depth, and steel hardness on the total heights of the profile and surface waviness for dry high-speed face milling. Mathematical processing of experimental results was used to identify the power type function and empirical mathematical models. These models highlight the direction of variation and the intensity of influence exerted by the considered input factors on the values of two waviness parameters in the case of dry high-speed face milling of samples made of four hard steels. It has been observed that the increase in steel hardness increases the total heights of the profile and surface waviness. In the case of two types of steel, a good correlation was identified between the values of the total profile waviness height and the total surface waviness height, respectively, using the Pearson correlation coefficient.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 4; 735-749
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis and control of dual stator Winding induction motor
    Autorzy:
    Pieńkowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/141285.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    model matematyczny
    analiza
    IFOC
    dual stator induction motor
    mathematical models
    analysis
    DFOC and DTC control
    Opis:
    The paper presents the mathematical models of dual stator squirrel-cage induction motor, formulated in phase coordinate system and in general transformed space vector form. The two types of models of dual stator induction motor are considered. The control systems of field-oriented control (IFOC and DFOC) and direct torque control (DTC) of the dual stator induction motor have been described and discussed.
    Źródło:
    Archives of Electrical Engineering; 2012, 61, 3; 421-438
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model for selection of involute gear parameters using the area of possible solutions method
    Autorzy:
    Herma, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/407329.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inżynieria produkcji
    optymalizacja parametrów
    model matematyczny
    mechanical engineering
    gears
    parameter optimization
    mathematical models
    production engineering
    Opis:
    The paper presents a method of selecting the parameters of external involute spur gearing components with straight and helical teeth for general - purpose gears, using the method of searching an area of possible solutions, understood as a space for values that meet several geometric, strength and operating criteria. Possible effects of this method in the context of gear production process organization and optimization, were also described.
    Źródło:
    Management and Production Engineering Review; 2012, 3, 2; 13-20
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Spherical Particles Size Distribution – Theoretical Basis
    Autorzy:
    Gurgul, D.
    Burbelko, A.
    Wiktor, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/379518.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    alloy crystallisation
    mathematical models
    analysis of spherical
    planimetric analysis
    linear analysis
    krystalizacja stopów
    modele matematyczne
    analiza sferyczna
    analiza planimetryczna
    analiza liniowa
    Opis:
    The determination of the form of a probability density function (PDF3) of diameters for nodular particles by using a probability density function (PDF2), which form is empirically estimated from cross-sections of these nodules in a metallographic specimen, can be regarded as a special case of Wicksell's corpuscle problem (WCP). The estimation of the PDF3 for the nodular particles provides information about the kinetics of these particles nucleation, and so about the kinetics of their growth. This information is essential for building more accurate mathematical models of the alloy crystallization. In the paper there are presented two derivations of the methods used for the estimation of the PDF3 form. The first method bases on diameters received from a planar cross-section. The second one uses also data from the planar cross-section but not the diameters only chords. Both methods provide practical rules for the analysis of the empirical diameters’ and chord’s size distribution and allow to estimate the mean value of the external surface area of the particles.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 29-34
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of flotation processes by classical mathematical methods – a review
    Modelowanie procesu flotacji przy pomocy klasycznych metod matematycznych – przegląd
    Autorzy:
    Jovanovic, I.
    Miljanovic, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/219078.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    flotation
    mathematical modelling
    empirical models
    probabilistic models
    population-balance models
    kinetic models
    flotacja
    modelowanie matematyczne
    modele empiryczne
    modele probabilistyczne
    modele równowagi populacji
    modele kinetyczne
    Opis:
    Flotation process modelling is not a simple task, mostly because of the process complexity, i.e. the presence of a large number of variables that (to a lesser or a greater extent) affect the final outcome of the mineral particles separation based on the differences in their surface properties. The attempts toward the development of the quantitative predictive model that would fully describe the operation of an industrial flotation plant started in the middle of past century and it lasts to this day. This paper gives a review of published research activities directed toward the development of flotation models based on the classical mathematical rules. The description and systematization of classical flotation models were performed according to the available references, with emphasize exclusively given to the flotation process modelling, regardless of the model application in a certain control system. In accordance with the contemporary considerations, models were classified as the empirical, probabilistic, kinetic and population balance types. Each model type is presented through the aspects of flotation modelling at the macro and micro process levels.
    Modelowanie procesów flotacji nie jest zagadnieniem prostym, głównie z uwagi na skomplikowany charakter samego procesu, czyli znaczną liczbę zmiennych które, w mniejszym lub w większym stopniu, mają wpływ na końcowy wynik procesu separacji cząstek materiału wykorzystującego różnice w ich właściwościach powierzchniowych. Próby stworzenia ilościowego modelu predyktywnego który w sposób pełny opisywałby przemysłowe procesy flotacji podjęto w połowie ubiegłego wieku a badania trwają po dzień dzisiejszy. W artykule przedstawiono przegląd działalności badawczej podejmowanej w celu opracowania modelu procesu flotacji opartego o zasady matematyki klasycznej. Opisu i systematyki modeli flotacji dokonano w oparciu o dostępną literaturę przedmiotu, główny nacisk kładąc na te modele, które wykorzystywane były wyłącznie do analizy procesu flotacji, bez względu na możliwość ich zastosowania także w układach sterowania. Zgodnie z obecnymi założeniami, modele sklasyfikowano jako empiryczne, probabilistyczne, kinetyczne oraz modele równowagi populacji. Każdy model zaprezentowany jest w kontekście modelowania procesu flotacji, z uwzględnieniem skali mikro oraz makro.
    Źródło:
    Archives of Mining Sciences; 2015, 60, 4; 905-919
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Baseline study in environmental risk assessment : site-specific model development and application
    Autorzy:
    Alam, Asifa
    Mahmood, Adeel
    Chaudhry, M. Nawaz
    Ahmad, Sajid Rashid
    Safa, Noor Ul
    Alghamdi, Huda Ahmed
    Alhamdi, Heba Waheeb
    Ullah, Rizwan
    Powiązania:
    https://bibliotekanauki.pl/articles/2203136.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    baseline study
    risk assessment models
    risk management
    mathematical approaches
    landfills
    dumping sites
    environmental risk estimation
    Opis:
    Environmental risk assessment is one of the key tools in environmental engineering. This risk assessment can be qualitative or quantitative and it is based on preliminary studies i.e., baseline study for waste disposal sites. Even though the literature exists on baseline study in general, still there is a lack of guidance regarding development of a site-specific baseline study model for a waste disposal site. This study has two-fold aim, firstly, how to develop site-specific baseline study model for a selected dumping site, and secondly, how this site-specific baseline study can support the environmental engineering via mathematical risk estimation. Mahmood Booti Open Dumping Site (MBODS) is selected to demonstrate the development and application of site-specific baseline study model. This is followed by building a framework that shows how the output of the baseline study can lead to environmental engineering via mathematical risk estimation. The paper provides a mechanism of how to construct a bespoke baseline-study model that is readily useable, avoiding procurement of expensive computer software and yet smoothly connecting with the follow-on stages of the risk assessment. The work presented in this paper can be reproduced repeatedly to create site-specific baseline study models for risk assessment of other waste disposal sites in a cost-effective, consistent and cohesive manner.
    Źródło:
    Archives of Environmental Protection; 2022, 48, 3; 80--88
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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