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Wyświetlanie 1-15 z 87
Tytuł:
Analysis of the roundness deviation measurement error with a double V-block support connected with errors of determining the method parameters
Analiza błędu pomiaru odchyłki okrągłości przy podparciu dwupryzmowym związanego z błędami ustalenia parametrów metody
Autorzy:
Nozdrzykowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/256124.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
błąd pomiaru
odchyłka okrągłości
podparcie dwupryzmowe
measurement error
roundness deviation
double V-block support
method parameters
Opis:
This article presents the results of an analysis of the error arising in measurements of roundness deviation in a double V-block support of a cylindrical object, connected with errors in determining the method parameters. The results lead to a conclusion that the effect of this error on the total random error of the method is minor and the best measurement systems for the error to be minimised are those with the V-block angle [gamma] = (30-60)°.
W artykule przedstawiono wyniki analizy błędu pomiaru odchyłki okrągłości przedmiotu cylindrycznego podpartego dwupryzmowo, związanego z błędami ustalenia parametrów metody. Otrzymane rezultaty pozwalają wnioskować, że wpływ tego błędu na sumaryczny błąd przypadkowy metody jest niewielki, a najkorzystniejsze układy pomiarowe z punktu widzenia mi-nimum tego błędu, to układy pomiarowe o kącie rozwarcia pryzmy [gamma] = (30÷60)°.
Źródło:
Problemy Eksploatacji; 2008, 1; 153-159
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of frequency response of transformer winding with axial deformations
Autorzy:
Gawrylczyk, K. M.
Banaszak, S.
Powiązania:
https://bibliotekanauki.pl/articles/140733.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transformer
winding
frequency response analysis (FRA)
lumped parameters method
transmission line method
Opis:
One of important methods used for diagnostics of a transformer’s active part is Frequency Response Analysis (FRA). It allows to determine the mechanical condition of windings, their displacements, deformations and electric faults, as well as some problems with internal leads and connections, core and bushings. Still pending problem is interpretation of measurements results. One of approaches is application of computer modeling to simulate various failure modes and connected with them changes in FRA response. The paper presents two types of models, one based on lumped parameters with RLC elements, and one based on distributed parameters with TLM method. Both methods give similar results, comparable to real measurements of simulated coil.
Źródło:
Archives of Electrical Engineering; 2014, 63, 1; 5-17
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of a mass variable drum winding a heavy rope
Autorzy:
Buśkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/38629421.pdf
Data publikacji:
2021
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
angular momentum
two time parameters method
time-variable mass
dynamic equations
drum
Opis:
The paper focuses on a winch drum winding a heavy rope to present the variety of issues related to the dynamics of systems with rotating parts of time-varying mass. The dynamic motion equations for such systems are frequently either incorrect or derived under the assumption of mass constancy. When the mass variability is taken into account, simpler cases are discussed. The considerations on the angular momentum theorem enables formulating a new two time parameters form of the rotational motion equation for the system with time varying mass. Four cases are considered and different approaches of motion equations derivation are applied. The assumptions and solution methods of the analyzed systems as well as ambiguities and possible contradictions that may arise as a result of the trial of the problem formulation on the grounds of rigid body mechanics are discussed. The numerical simulations are presented.
Źródło:
Archives of Mechanics; 2021, 73, 5-6; 557-582
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ensuring the reliability and performance criterias of crankshafts
Autorzy:
Kotliar, Alexey
Gasanov, Magomediemin
Basova, Yevheniia
Panamariova, Olga
Gubskyi, Sergii
Powiązania:
https://bibliotekanauki.pl/articles/328644.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
crankshaft
initial parameters method
reliability
grinding machine
rest
wał korbowy
niezawodność
szlifierka
Opis:
The issues of efficiency improvement of manufacturing crankshafts in order to ensure their reliability and performance criteria are the priorities in modern production of internal combustion engines. Using the capabilities of modern special grinding machines can improve the quality of machining and obtain the necessary running characteristics of crankshafts. In work the questions connected with development of a method of calculation of rigidity of crankshafts for increase of accuracy of their machining, reliability and performance criteria’s are considered. Based on the proposed methodology, numerical calculations have performed and the possibility of determining the deflections and crankshafts rigidity in any section have been justified. The original construction of the following grinding steady rest for CNC grinding machines specified for machining the crankshaft main bearing journal and connecting rod journal is proposed. The construction design of the device allows for compensating the influence of the cutting force on the elastic strain of the part, depending on the change in its rigidity. The practical value of the research includes in develop recommendations for determining the optimal parameters for the round infeed grinding cycle of the crank pins from the point of view of productivity and accuracy.
Źródło:
Diagnostyka; 2019, 20, 1; 23-32
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of variation of the parameters method for micropolar flow in a porous channel
Autorzy:
Güngör, Osman
Arslantürk, Cihat
Powiązania:
https://bibliotekanauki.pl/articles/1839802.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
micropolar flow
porous channel
variation of parameters method
przepływ mikropolarny
metoda zmiany parametrów
kanał porowaty
Opis:
This work devoted to study the injective micropolar flow in a porous channel. The flow is driven by suction or injection on the channel walls, and the micropolar model is used to characterize the working fluid. The governing nonlinear partial differential equations are reduced to the nonlinear ordinary coupled differential equations by using Berman’s similarity transformation. These equations are solved for large mass transfer via variation of parameters method (VPM) which has been used effectively in the solution of nonlinear equations recently. This method has not previously been applied to a problem of micropolar flow. The results of the variation of parameters method are found to be in excellent agreement with the results of the Matlab bvp4c solver (NUM). With this validity, the effects of the some important parameters on the velocity and rotation profile of micropolar flow are discussed in detail. It can be seen that increases in the values N1 and N3 have different results in comparison with N2 increasing.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 1; 17-29
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of variation of the parameters method for micropolar flow in a porous channel
Autorzy:
Güngör, Osman
Arslantürk, Cihat
Powiązania:
https://bibliotekanauki.pl/articles/122970.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
micropolar flow
porous channel
variation of parameters method
przepływ mikropolarny
metoda zmiany parametrów
kanał porowaty
Opis:
This work devoted to study the injective micropolar flow in a porous channel. The flow is driven by suction or injection on the channel walls, and the micropolar model is used to characterize the working fluid. The governing nonlinear partial differential equations are reduced to the nonlinear ordinary coupled differential equations by using Berman’s similarity transformation. These equations are solved for large mass transfer via variation of parameters method (VPM) which has been used effectively in the solution of nonlinear equations recently. This method has not previously been applied to a problem of micropolar flow. The results of the variation of parameters method are found to be in excellent agreement with the results of the Matlab bvp4c solver (NUM). With this validity, the effects of the some important parameters on the velocity and rotation profile of micropolar flow are discussed in detail. It can be seen that increases in the values N1 and N3 have different results in comparison with N2 increasing.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 1; 17-29
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybór racjonalnych wariantów produkcji energooszczędnych elementów budowlanych
The Choice of Rational Variants of Energy-Efficient Building Components Production
Autorzy:
Bobko, T.
Całusiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/2065070.pdf
Data publikacji:
2012
Wydawca:
Politechnika Częstochowska
Tematy:
energooszczędne procesy fizykomechaniczne
budowlane elementy stalowe
modelowanie procesu produkcyjnego
method or modeling parameters
energy-efficient building components
Opis:
W artykule przedstawiono propozycję metody wyboru racjonalnych wariantów produkcji elementów konstrukcji stalowych w oparciu o kryterium minimalnego zużycia energii całkowitej i kosztu tej energii. Zaprezentowano modele matematyczne do wyboru racjonalnych wariantów procesu produkcji elementów metalowych.
This paper proposes a method of choice of rational variants of energy-efficient building components production based on the criterion of minimum total energy consumption and cost of energy used. There have been presented mathematical models for selection or rational variants of metal elements production process.
Źródło:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2012, 1 (9); 19--35
2299-8535
2544-963X
Pojawia się w:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal analysis of longitudinal a porous fin with temperature-dependent internal heat generation using the variation of parameters method
Autorzy:
Güngör, Osman
Arslantürk, Cihat
Powiązania:
https://bibliotekanauki.pl/articles/1839762.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
variation of parameters method
porous fin
heat generation
exact solution
metoda wariacji parametrów
żebro porowate
wytwarzanie ciepła
dokładne rozwiązanie
Opis:
The present study investigates the thermal performance of longitudinal a porous fin with temperature-dependent internal heat generation. The Darcy model is utilized to obtain the differential form of the governing equation that solves the nonlinear temperature distribution equation using the method of variation of parameters. Although this method is applied to solve both linear and nonlinear differential equations, there exist rare applications of this method to solve nonlinear heat transfer problems. In the present study, we applied the method to estimate the thermal analysis of the porous fin exposed to convection. The heat generation is assumed as a function of temperature. The effects of the convection parameter Nc, internal heat generation ɛ, porosity Sh, and generation number G parameter on the dimensionless temperature distribution are discussed in detail. The accuracy of the variation of parameters method is verified through comparison with homotopy perturbation method and the Matlab bvp4c solver (NUM). The results have disclosed that the variation of parameters method can be used as a very effective and practical approach for further studies of the porous medium.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 3; 5-16
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Weryfikacja metody wyznaczania akwenu manewrowego statku opartej na pomiarach dalmierzem laserowym
Verification of the Method of Determining the Ships Swept Path Width Based on the Landborne Laser Rangefinder Measurements
Autorzy:
Zalewski, P.
Montewka, J.
Powiązania:
https://bibliotekanauki.pl/articles/360567.pdf
Data publikacji:
2006
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
bezpieczny obszar manewrowy
pomiary laserowe
weryfikacja metod
EXPLO-SHIP 2006
method of determination waterway parameters
laser rangefinder measurement
Opis:
W artykule przedstawiono weryfikację autonomicznej metody wyznaczania akwenu manewrowego statku, opartej na optoelektronicznych technikach pomiarowych. Weryfikacji dokonano za pomocą metody wykorzystującej techniki pomiarowe RTK GNSS.
The paper presents a verification of the optoelectronic experiment based method, by means of another method using RTK GNSS techniques.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2006, 11 (83); 405-412
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variation of parameters method for a three-dimensional problem of condensation film on an inclined rotating disk
Autorzy:
Güngör, Osman
Arslantürk, Cihat
Powiązania:
https://bibliotekanauki.pl/articles/122445.pdf
Data publikacji:
2019
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
condensation
rotating inclined disk
nonlinear ordinary differential equations
variation of parameters method
VPM
kondensacja
nieliniowe równania różniczkowe zwyczajne
metoda zmiany parametrów
Opis:
In this paper, the steady three-dimensional problem of condensation film on an inclined rotating disk is considered. The governing nonlinear partial differential equations are reduced to the nonlinear ordinary differential equations system by a similarity transform. The equation system is solved by the variation of parameters method (VPM) which is rather used to solve nonhomogeneous linear differential equations but can also be used to solve nonlinear differential equations. This method has not previously been used to solve a nonlinear condensation problem. The dimensionless velocity and temperature profiles are shown, and the influence of Prandtl number and rotation ratio on the flow field and the Nusselt number are discussed in detail. In order to assess the accuracy of the solutions obtained by this method, the problem is also solved numerically using the Matlab bvp4c solver. The validity of our solutions is verified by the numerical results.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2019, 18, 1; 15-28
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat transfer study in a convective-radiative fin with temperature-dependent thermal conductivity and magnetic field using variation parameters method
Autorzy:
Sobamowo, G.
Jayesimi, L.
Femi-Oyetoro, J.
Powiązania:
https://bibliotekanauki.pl/articles/122666.pdf
Data publikacji:
2017
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
heat transfer study
convective-radiative fin
variation of parameters method
temperature-dependent thermal conductivity
magnetic field
wymiana ciepła
przewodność cieplna
żebro
Opis:
In this work, a heat transfer study is carried out in a convective-radiative straight fin with temperature-dependent thermal conductivity and a magnetic field using the variation of parameters method. The developed heat transfer model is used to analyze the thermal performance, establish the optimum thermal design parameters and investigate the effects of thermo-geometric parameters and non-linear thermal conductivity parameters on the thermal performance of the fin. The results obtained are compared with the results in literature and good agreements are found. The analysis can serve as basis for comparison of any other method of analysis of the problem and it also provides a platform for improvement in the design of fin in heat transfer equipment.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2017, 16, 3; 85-96
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of Kalman filtering to predict vertical rail axis displacements of the overhead crane being a component of seaport transport structure
Autorzy:
Filipiak–Kowszyk, D.
Kamiński, W.
Powiązania:
https://bibliotekanauki.pl/articles/260026.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
operational safety of the crane
rectification corrections
parametric method with conditions imposed on parameters
prediction
Kalman filtering
Opis:
As the devices designed to transport materials, the overhead cranes should meet certain geometric requirements for their operation to be safe. The presently available geodetic equipment, in particular total stations, provides opportunities for precise 3D measurements of coordinates of the controlled points. These coordinates make a basis for correcting the height of crane runway axes. The paper presents a method to calculate position corrections for the crane rail axes in both vertical and horizontal direction, and indicates that these results can find much wider application. Among other goals, the observations of this type, along with the Kalman filtration method, can be used to predict vertical displacements of the crane rail axes. The object of practical considerations in the paper is a crane working in the area with unfavourable geotechnical conditions and the settling limits attributed to this crane and location area in the technical design. The sample practical application has confirmed the validity of the use of the proposed solution for evaluating the operational safety of the crane. Although the tests were performed for the gantry crane, the proposed solution is believed to be applicable for other types of overhead cranes.
Źródło:
Polish Maritime Research; 2016, 2; 64-70
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A versatile tool for extraction of MOSFETs parameters
Autorzy:
Tomaszewski, D.
Kociubiński, A.
Marczewski, J.
Kucharski, K.
Domański, K.
Grabiec, P.
Powiązania:
https://bibliotekanauki.pl/articles/308856.pdf
Data publikacji:
2005
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
MOSFETs parameters
SPICE
least squares method
Opis:
Extraction of MOSFET parameters is a very important task for the purposes of MOS integrated circuits characterization and design. A versatile tool for the MOSFET parameter extraction has been developed in the Institute of Electron Technology (IET). It is used to monitor the technologies applied for fabrication of several groups of devices, e.g., CMOS ASICs, SOI pixel detectors. At present two SPICE MOSFET models (LEVEL = 1, 2) have been implemented in the extraction tool. The LEVEL = 3 model is currently being implemented. The tool combines different methods of parameter extraction based on local as well as global fitting of models to experimental data.
Źródło:
Journal of Telecommunications and Information Technology; 2005, 1; 129-134
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the stator geometry on magnetic bearing parameters
Autorzy:
Tomczuk, B.
Wajnert, D.
Powiązania:
https://bibliotekanauki.pl/articles/141529.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
parameters of active magnetic bearing
FEM method
Opis:
This paper presents an analysis of the stator teeth geometry impact on the parameters of the 8-pole radial magnetic bearing. In this paper, such parameters as current gain and position stiffness have been analysed. Additionally, we have proposed criteria for evaluating the characteristics of these parameters by calculating the variability of current gain and position stiffness. The research has been performed by solving the magnetic bearing actuator boundary problem using the finite element method. Magnetic force has been calculated using the Maxwell stress tensor method. Other parameters, such as current gain and position stiffness have been calculated as partial derivate of the force with respect to control current and position of the rotor.
Źródło:
Archives of Electrical Engineering; 2013, 62, 2; 209-215
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy Logic Enhancement of Material Strain Hardening Data Obtained in the Heyers Test
Autorzy:
Skrzat, A.
Wójcik, M.
Bąk, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/354901.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fuzzy logic
plasticity
material hardening parameters
Heyer's method
Opis:
Fuzzy logic determination of the material hardening parameters based on the Heyer’s method was applied in this research. As the fuzzy input variables, the length of two measuring bases and the maximum force registered in the Heyer's test were used. Firstly, the numerical experiment (the simulation of the fuzzification of the input data) with the assumed disturbance of input variables was performed. Next, on the basis of experimental investigations (eleven samples made from the same material), the membership functions associated with the input data were created. After that, the fuzzy analysis was examined. Fuzzy material hardening constants obtained by means of the α-level optimization and the extension principle methods were compared. Discrete values of the hardening data are found in the defuzzification process, by application of the mass center method.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 1059-1065
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 87

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