Autor: Bouaziz, S. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Stability analysis and dynamic behaviour of a flexible asymmetric rotor supported by active magnetic bearings
Autorzy:: Attia Hili, M.
Bouaziz, S.
Haddar, M.
Powiązania:: https://bibliotekanauki.pl/articles/280401.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: asymmetric rotor
finite element
Floquet’s theory
dynamic coefficients
stability
Opis:: The objective of this work is to show the influence of dynamic characteristics of Active Magnetic Bearings (AMBs) on the stability and dynamic response of an asymmetric and unbalanced rotor. Indeed, AMBs have been successfully applied in several industrial machinery facilities. Their main advantages are the contactless working principle, frictionless suspension and operation in very high speeds. Firstly, the AMBs dynamic support parameters have been obtained through electromagnetic theory. Then, a generalized system equations of motion have been derived using the finite element method. The motion of a rotor the shaft cross-section of which is asymmetric is generally governed by ordinary differential equations with periodic coefficients. Floquet’s theory is used to investigate the stability of this system of equations. Finally, numerical simulation results are presented and discussed.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 3; 751-763
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Vibration analysis of three-layered nanobeams based on nonlocal elasticity theory
Autorzy:: Kammoun, N.
Jrad, H.
Bouaziz, S.
Soula, M.
Haddar, M.
Powiązania:: https://bibliotekanauki.pl/articles/280463.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: beams theories
nonlocal elasticity theory
vibration analysis
GDQ method
Opis:: In this paper, the first investigation on free vibration analysis of three-layered nanobeams with the shear effect incorporated in the mid-layer based on the nonlocal theory and both Euler Bernoulli and Timoshenko beams theories is presented. Hamilton’s formulation is applied to derive governing equations and edge conditions. In order to solve differential equations of motions and to determine natural frequencies of the proposed three-layered nanobeams with different boundary conditions, the generalized differential quadrature (GDQM) is used. The effect of the nanoscale parameter on the natural frequencies and deflection modes shapes of the three layered-nanobeams is discussed. It appears that the nonlocal effect is important for the natural frequencies of the nanobeams. The results can be pertinent to the design and application of MEMS and NEMS.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1299-1312
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Cutting parameters and vibrations analysis of magnetic bearing spindle in milling process
Autorzy:: Bouaziz, A.
Barkallah, M.
Bouaziz, S.
Choley, J. Y.
Haddar, M.
Powiązania:: https://bibliotekanauki.pl/articles/279623.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: milling process
cutting forces
chip thickness
dynamic coefficients
orbit
Opis:: In modern production, milling is considered the widespread cutting process in the formatting field. It remains important to study this manufacturing process as it can be subject to some parasitic phenomena that can degrade surface roughness of the machined part, increase tool wear and reduce spindle life span. In fact, the best quality work piece is obtained with a suitable choice of parameters and cutting conditions. In another hand, the study of tool vibrations and the cutting force attitude is related to the study of bearings as they present an essential part in the spindle system. In this work, a modeling of a High Speed Milling (HSM) spindle supported by two pair of Active Magnetic Bearings (AMB) is presented. The spindle is modeled by Timoshenko beam finite elements where six degrees of freedom are taken into account. The rigid displacements are also introduced in the modeling. Gyroscopic and centrifugal terms are included in the general equation. The bearings reaction forces are modeled as linear functions of journal displacement and velocity in the bearing clearance. A cutting force model for peripheral milling is proposed to estimate the tool-tip dynamic responses as well as dynamic cutting forces which are also numerically investigated. The time history of response, orbit, FFT diagram at the tool-tip center and the bearings dynamic coefficients are plotted to analyze dynamic behavior of the spindle.
Źródło:: Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 691-703
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Water-soluble polysaccharides from Opuntia stricta Haw. fruit peels: recovery, identification and evaluation of their antioxidant activities
Autorzy:: Koubaa, M.
Ktata, A.
Barba, F.J.
Grimi, N.
Mhemdi, H.
Bouaziz, F.
Driss, D.
Chaabouni, S.E.
Powiązania:: https://bibliotekanauki.pl/articles/25448.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:: International Agrophysics; 2015, 29, 3
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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