Wyniki wyszukiwania - BazTech

1

Multivariate calculations of the electrodynamic linear accelerator with a permanent magnet support

Waindok Andrzej, Tomczuk Bronisław, Piekielny Paweł

Journal of Theoretical and Applied Mechanics

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2020

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Vol. 58 nr 3

733--741

EN

Multivariate calculations of the electrodynamic accelerator with a permanent magnet support and a ferromagnetic core are presented in the paper. The calculations were made with using the Magnetostatic module of Maxwell/ANSYS software. The purpose of these calculations was to determine the size and location of permanent magnets in terms of maximizing the force acting on the projectile. In the presented paper, three cases have been analyzed. In order to perform a comparative analysis of the obtained results of calculations, dimensions of the rails, projectile and outer dimensions of the core were kept constant.

2

Badanie przepływów wewnętrznych w pompach pod kątem obliczania sił hydraulicznych

Karaśkiewicz K.

Prace Naukowe Politechniki Warszawskiej. Mechanika

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2013

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z. 261

3--142

EN

Hydraulic forces occurring in rotodynamic pumps, especially those in power industry where they are essential in ensuring reliable pump performance, are important for appropriate sizing of shaft and bearings, proper designing the balancing device and avoiding the excessive pump vibration. Accuracy of the prediction of the forces is still not satisfactory. The reasons of and methods for predicting stable and unstable axial and radial thrust are comprehensively discussed. Three kinds of the pressure distribution assessment in the impeller sidewall gaps to get axial thrust are analyzed i.e. empirical, integral and RANS. Empirical and numerical investigations are presented. Additional issues important for predicting axial thrust are thoroughly analyzed such as impeller and balancing device annular seals flows, similarity laws for axial thrust, impeller internal force, forces in open and semi-open impellers. The issues of balancing axial thrust are also analyzed. The results of measurements and predictions of radial thrust in a single volute centrifugal pump are presented and methods of balancing discussed. The dynamic forces in annular seals are discussed. Unsteady interaction between impeller and diffuser and rotating stall are analyzed.

3

Force and stress calculation in DC dielectrophoresis

Kurgan E.

Poznan University of Technology Academic Journals. Electrical Engineering

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2012

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No. 69

111--116

EN

In this paper, two-dimensional direct current (DC) dielectrophoresis is presented. First electric field distribution in particle and surrounding fluid is calculated and next stresses acting from both sides suspension-particle boundary are evaluated. These values are fundamental for force calculation in two-dimensional dielectrophoresis and in simulation of the velocity distribution in interdigitated electrodes.

4

An Influence of Electrode Geometry on Particle Forces in AC Dielectrophoresis

Kurgan E., Gas P.

Przegląd Elektrotechniczny

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2010

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R. 86, nr 1

103-105

EN

In this paper we calculate electric field distribution and forces acting on single dielectric particle. Dipole approximation method is adopted. Finite element method is used in order to evaluate electromagnetic field in fluid suspension. Different shapes of interdigitated electrodes are investigated in order to optimize dielectrophoretic force acting on particle. At the end computational results are presented.

PL

W tej publikacji obliczany jest rozkład pola elektromagnetycznego oraz siły działające na cząsteczkę dielektryka. Do obliczania sił działających na cząstkę dielektryka użyta jest metoda przybliżona oparta na multipolowym rozwinięciu potencjału. Do obliczenia rozkładu pola elektromagnetycznego w zawiesinie została użyta metoda elementów skończonych. Rozważane są różne kształty elektrod w celu zoptymalizowania sił działających na cząsteczkę. Na końcu artykułu podany jest przykład obliczeniowy.

5

Selected problems of radial forces calculation in single-phase induction motors

Frydrychowicz-Jastrzębska G.

Zeszyty Naukowe. Elektryka / Politechnika Łódzka

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1998

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z. 92

83--88

EN

Results of calculation of electromagnetic radial forces in single - phase induction motors, obtained from the relations derived taking into account elliptical form of the field, the number and opening of the slots and eccentricity [1], have been compared to the calculation results achieved with the assumption of circular field in the air gap. It was proved that, in general case, disregard of backward component of magnetic field in the consideration leads to deformation of physical image.

PL

Porównano wyniki obliczeń elektromagnetycznych sił promieniowych w silnikach indukcyjnych jednofazowych uzyskane na podstawie zależności wyprowadzonych przy uwzględnieniu charakteru eliptycznego pola, liczby i rozwarcia żłobków oraz mimośrodowości [1] z wynikami obliczeń otrzymanymi przy założeniu pola kołowego w szczelinie. Wykazano, że w ogólnym przypadku, pominięcie składowej przeciwbieżnej pola magnetycznego w rozważaniach prowadzi do zniekształceń obrazu fizycznego zachodzących zjawisk.