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Wyświetlanie 1-6 z 6
Tytuł:
m-Synthesis control of flexible modes of AMB rotor
Autorzy:
Mystkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/386538.pdf
Data publikacji:
2010
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
wirnik
synthesis
elastyczność
rotor
synteza
flexibility
Opis:
In the paper the optimal robust vibration control of flexible rotor supported by the active magnetic bearings (AMBs) is investigated. The purpose of the control system is stabilization of the high speed rotor and effective control of the rotor vibration due to noncollocation, gyroscopic effects and model uncertainties. The noncollocation effect is considered and frequency modal analysis of the noncollocated AMBs system with gyroscopic effects is presented. The ž-Synthesis control is applied to stabilize the rigid and flexible critical frequency modes of the rotor, with emphasis structural and parametric uncer-tainty. The input and output signals in AMBs system are limited by the weighting functions. The singular value analysis is used to obtain therobust performances of the closed-loop system. The stable operation and good stiffness of the high speed rotor supported magnetically is reached. The dynamical behaviour of the AMBs rotor is evaluated in the range up to 21 000 rpm. The experimental tests show the effectiveness of the robust control system as well as good vibrations reduction and robustness of the designed controllers.
Źródło:
Acta Mechanica et Automatica; 2010, 4, 4; 83-90
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contact strength of a system of two elastic half spaces with an axially symmetric recess under compression
Autorzy:
Monastyrskyy, B.
Kaczyński, A.
Powiązania:
https://bibliotekanauki.pl/articles/386550.pdf
Data publikacji:
2010
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
kompresja
elastyczność
frictionless contact
compression
elasticity
Opis:
Frictionless contact of two isotropic half spaces is considered one of which has a small smooth circular recess. A method of solving the corresponding boundary value problem of elasticity in axially symmetric case is presented via the function of gap height. The governing integral equation for this function is solved analytically by assuming a certain shape of the initial recess. On the basis of the closed-form solution obtained the strength analysis of a contact couple is performed and illustrated from the standpoint of fracture mechanics.
Źródło:
Acta Mechanica et Automatica; 2010, 4, 4; 64-70
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self-regular stress integral equations for the axisymmetric elasticity
Autorzy:
Sulym, H.
Pasternak, I.
Powiązania:
https://bibliotekanauki.pl/articles/387198.pdf
Data publikacji:
2009
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
elastyczność
naprężenie
równanie całkowe
elasticity
stress
integral equation
Opis:
The stress hypersingular integral equations of axisymmetric elasticity are considered. The singular and hypersingular integrals are regularized using the imposition of auxiliary polynomial solution, and self-regular integral equations are obtained for bounded and unbounded domains. The stress-BEM formulation is considered basing on the proposed equations. Considered numerical examples show high efficiency of the proposed approach. New problem for inclusion in finite cylinder is considered.
Źródło:
Acta Mechanica et Automatica; 2009, 3, 4; 80-84
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exact Solution of a Dielectric Crack of Mode III in Magneto-Electro-Elastic Half-Space
Autorzy:
Rogowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/386253.pdf
Data publikacji:
2011
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
elastyczność
dielektryki
równianie Fredholma
elasticity theory
dielectrics
Fredholm equation
Opis:
This paper investigated the fracture behaviour of a piezo-electro-magneto-elastic material subjected to electro-magneto-mechanical loads. The PEMO-elastic medium contains a straight-line crack which is parallel to its poling direction and loaded surface of the half-space. Fourier transform technique is used to reduce the problem to the solution of one Fredholm integral equation. This equation is solved exactly. The semi-permeable crack-face magneto-electric boundary conditions are utilized. Field intensity factors of stress, electric displacement, magnetic induction, crack displacement, electric and magnetic potentials, and the energy release rate are determined. The electric displacement and magnetic induction of crack interior are discussed. Strong coupling between stress and electric and magnetic field near the crack tips has been found.
Źródło:
Acta Mechanica et Automatica; 2011, 5, 4; 86-94
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some differential equations of elasticity and their lie point symmetry generators
Autorzy:
Bocko, J.
Glodová, I.
Lengvarský, P.
Powiązania:
https://bibliotekanauki.pl/articles/387419.pdf
Data publikacji:
2014
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
symmetry
differential equations
elasticity
group generator
Lie group
symetria
równania różniczkowe
elastyczność
grupa Liego
Opis:
The formal models of physical systems are typically written in terms of differential equations. A transformation of the variables in a differential equation forms a symmetry group if it leaves the differential equation invariant. Symmetries of differential equations are very important for understanding of their properties. It can be said that the theory of Lie group symmetries of differential equations is general systematic method for finding solutions of differential equations. Despite of this fact, the Lie group theory is relatively unknown in engineering community. The paper is devoted to some important questions concerning this theory and for several equations resulting from the theory of elasticity their Lie group infinitesimal generators are given.
Źródło:
Acta Mechanica et Automatica; 2014, 8, 2; 99-102
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transient Plane Waves in Multilayered Half-Space
Autorzy:
Turchyn, I.
Turchyn, O.
Powiązania:
https://bibliotekanauki.pl/articles/386919.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
dynamika
elastyczność
rozwiązanie analityczne
transformacja Fouriera
dynamical problem of elasticity
multilayered half-space
analytical solution
Fourier integral transformation
Opis:
Considered the dynamic problem of the theory of elasticity for multilayered half-space. Boundary surface of inhomogeneous half-space loaded with normal load, and the boundaries of separation layers are in conditions of ideal mechanical contact. The formulation involves non-classical separation of equations of motion using two functions with a particular mechanical meaning volumetric expansion and function of acceleration of the shift. In terms of these functions obtained two wave equation, written boundary conditions and the conditions of ideal mechanical contact of layers. Using the Laguerre and Fourier integral transformations was obtained the solution of the formulated problem. The results of the calculation of the stress-strain state in the half-space with a coating for a local impact loading are presented.
Źródło:
Acta Mechanica et Automatica; 2013, 7, 1; 53-57
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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