Autor: Dunaj, Paweł - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Application of the finite element method in the milling process stability diagnosis
Autorzy:: Dunaj, Paweł
Marchelek, Krzysztof
Chodźko, Marcin
Powiązania:: https://bibliotekanauki.pl/articles/279318.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: chatter
finite element modelling
modal analysis
machine tool
Opis:: The article presents results of both experimental and FEM model-based investigations on chatter phenomena that occur in the end milling process. On the basis of chatter symptoms observed during machining, the mechanism of its occurrence has been identified. Then, a FEM model has been built to indicate machine tool elements responsible for loss of stability. Afterwards, experimental modal analysis has been conducted in order to validate the FEM model. Finally, on the basis of the validated model, the structural changes have been proposed and applied in the real object resulting in increased stability.
Źródło:: Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 353-367
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Timoshenko beam model for vibration analysis of composite steel-polymer concrete box beams
Autorzy:: Niesterowicz, Beata
Dunaj, Paweł
Berczyński, Stefan
Powiązania:: https://bibliotekanauki.pl/articles/2055041.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: Timoshenko beam
Euler-Bernoulli beam
free vibration
composite beam
finite element model
Opis:: The free vibration model of a steel-polymer concrete beam based on Timoshenko beam theory is presented in this paper. The results obtained on the basis of the model analysis, describing the values of the natural frequencies of the beam vibrations, were compared with the results obtained by the solution of the model formulated on the basis of the classical Euler-Bernoulli beam theory, the finite element model and the results of experimental studies. The developed model is characterized by high compliance with experimental data: the relative error in the case of natural vibration frequencies does not exceed 0.4%, on average 0.2%.
Źródło:: Journal of Theoretical and Applied Mechanics; 2020, 58, 3; 799--810
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Straight and Bent Bars Buckling Considered as the Axial Displacement of One Bar End
Autorzy:: Berczyński, Stefan
Dunaj, Paweł
Grządziel, Zenon
Powiązania:: https://bibliotekanauki.pl/articles/2064886.pdf
Data publikacji:: 2020
Wydawca:: STE GROUP
Tematy:: buckling
Euler buckling
straight bar
critical force
bent-up bar
Opis:: A new approach has been taken to the problem of straight and bent bar buckling, where bar buckling is considered as a function of axial displacement of one end. It was assumed that the length of a bar being buckled at any instant of buckling is the same as that of a straight bar, regardless of the size of axial displacement of one end of the bar. Based on energy equations, a formula was derived for the value of axial displacement of one bar end or buckling amplitude in the middle of bar length as a function of compressive force. The established relationships were confirmed by simulation tests using the finite element software Midas NFX and by experimental tests.
Źródło:: Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 57--70
2545-2827
Pojawia się w:: Multidisciplinary Aspects of Production Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Orthotropic model of rolling bearing in modeling lathe spindle dynamics
Autorzy:: Tomaszewski, Jan
Dunaj, Paweł
Powałka, Bartosz
Jasiewicz, Marcin
Powiązania:: https://bibliotekanauki.pl/articles/2086957.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: spindle-bearing system
roller bearing
orthotropic material
lathe
machine tool
Opis:: This paper presents a method for simplified modeling of bearing nodes of a lathe spindle using the finite element method. The proposed modeling methodology is based on the use of an orthotropic material model, which is used to reflect the stiffness properties of the bearing, both in the radial and axial directions. The modeling results have been experimentally verified. This resulted in full agreement of the mode shapes, an average relative error of the natural frequency values of 1.48% and high agreement of the receptance function.
Źródło:: Journal of Theoretical and Applied Mechanics; 2022, 60, 1; 17--31
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

Artykuł

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