Temat: self-excited - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Numerical Simulation of Self-Excited Vibrations Under Variable Cutting Conditions
Autorzy:: Bąk, P. A.
Jemielniak, K.
Powiązania:: https://bibliotekanauki.pl/articles/99477.pdf
Data publikacji:: 2015
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: self-excited vibration
numerical simulation
virtual machining
Opis:: A self-excited vibrations are one of the most important constraints to the performance and quality of machining part and it is affecting its dimensions and geometrical accuracy. Machining stability can be evaluated by different analytical and numerical methods. The paper presents utilization of numerical simulation of non-linear chatter in the time domain in stability analysis of machining process. Vibrations and cutting forces are an output from numerical simulation. In order to perform chatter recognition during excessive vibrations an automatic chatter detection is implemented in machining simulation. By combining all the above in one and enabling G-code reading, a tool for numerical simulation and validation of entire machining operation was created which is a subject of this paper.
Źródło:: Journal of Machine Engineering; 2015, 15, 1; 36-45
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Dynamic parameter identification in nonlinear machining systems
Autorzy:: Nicolescu, M.
Archenti, A.
Powiązania:: https://bibliotekanauki.pl/articles/100167.pdf
Data publikacji:: 2013
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machining system
dynamic parameters
white noise excitation
self-excited vibration
Opis:: The demand for enhanced performance of production systems in terms of quality, cost and reliability is ever increasing while, at the same time, there is a demand for shorter design cycles, longer operating life, minimisation of inspection and maintenance needs. Experimental testing and system identification in operational conditions still represent an important technique for monitoring, control and optimization. The term identification refers in the present paper to the extraction of information from experimental data and is used to estimate operational dynamic parameters for machining systems. Such an approach opens up the possibility of monitoring the dynamics of machining systems during operational conditions, and can also be used for control and/or predictive purposes The machining system is considered nonlinear and excited by random loads. Parametric and nonparametric techniques are developed for the identification of the nonlinear machining system and their application is demonstrated both by numerical simulations and in actual machining operations. Discrimination between forced and self-excited vibrations is also presented. The ability of the developed methods to estimate operational dynamic parameters ODPs is presented in practical machining operations.
Źródło:: Journal of Machine Engineering; 2013, 13, 3; 91-116
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Application of Geometric Simulation for Determination of Dynamic Undeformed Chip Thickness in Milling
Autorzy:: Bombiński, Sebastian
Jemielniak, Krzysztof
Powiązania:: https://bibliotekanauki.pl/articles/2201898.pdf
Data publikacji:: 2023
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: self-excited vibration
numerical simulation
computer graphics
5-axis milling
Opis:: Self-excited vibration is a significant constraint on productivity and production quality, which makes various forms of virtual machining widely used to find stable conditions before starting the actual machining operation. Numerical simulation of self-excited vibration, although much slower than analytical solutions, makes it possible to consider the nonlinearity of the process and its continuous variation. In 5-axis milling, predicting the instantaneous cross-sections of the uncut chip is very difficult, so geometric simulation is readily used to check the correctness of the NC program and the obtained shape of the workpiece. However, the known solutions take into consideration only programmed movements of the tool relative to the workpiece without considering vibrations, and those in which attempts have been made to consider vibrations have significant limitations. This paper uses a Geometric Simulator that determines the nominal positions of the tool relative to the workpiece, to which the displacements due to vibration, determined by the Dynamic Simulator, are added, making it possible to effectively determine the dynamic thickness of the cut layer and the trace on the workpiece material left by the vibrating tool. The use of geometric simulation, in which the material is represented by discrete voxels, introduces signal quantization, that is, the limited resolution of undeformed chip thickness and trace left on the machined surface. The paper presents the effect of voxel dimension on the accuracy of the simulation of self-excited vibrations.
Źródło:: Advances in Science and Technology. Research Journal; 2023, 17, 1; 173--181
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The impact of primary suspension stiffness of 2-axle bogie of MKIII passenger car on its dynamical behaviour
Autorzy:: Zboiński, K.
Golofit-Stawińska, M.
Powiązania:: https://bibliotekanauki.pl/articles/961421.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: numerical simulation
non-linear dynamics
self-excited vibration
symulacja numeryczna
dynamika nieliniowa
samowzbudne wibracje
Opis:: This article presents results of the study on the impact of stiffness in vehicle primary suspension for lateral direction kzy and longitudinal direction kzx. The study was carried out for 2-axle bogie of MKIII passenger car. The problem was solved by numerical tests performed with the simulation software for dynamics of vehicle-track system. Performed study consisted in varying both stiffness types through change of their values from 0.001 to 1000 times as compared to nominal value.
Źródło:: Transport Problems; 2018, 13, 1; 135-146
1896-0596
2300-861X
Pojawia się w:: Transport Problems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Metoda wyznaczania współczynnika tarcia par ciernych w warunkach drgań samowzbudnych wahadła Froude`a
Method of friction coefficient determination of friction pairs in conditions of self-excited vibration of Froude pendulum
Autorzy:: Piątkowski, T.
Powiązania:: https://bibliotekanauki.pl/articles/250473.pdf
Data publikacji:: 2015
Wydawca:: Instytut Naukowo-Wydawniczy TTS
Tematy:: tarcie
wahadło Froude'a
współczynnik tarcia
drgania samowzbudne
friction
Froude's pendulum
friction coefficient
self-excited vibration
Opis:: W artykule przedstawiono propozycję metody wyznaczania współczynników tarcia suchego statycznego i kinetycznego dla par kinematycznych w warunkach drgań samowzbudnych występujących w wahadle Froude’a. W metodzie tej, w pierwszej kolejności należy wyznaczyć współczynnik tarcia kinetycznego, który następnie należy wykorzystać podczas obliczania współczynnika tarcia statycznego. Współczynniki tarcia wyznaczane są na podstawie pomiaru amplitudy drgań samowzbudnych wahadła. Pomiar tej amplitudy, dla współczynnika tarcia kinetycznego należy przeprowadzić, gdy panują warunki tarcia ślizgowego, a statycznego – gdy warunki zjawiska stickslip.
The paper presents a method for the static and kinetic friction coefficients determination of kinematic pairs in the conditions of self-excited vibrations occur-ring in the Froude pendulum. In this method, as the first the kinetic friction coefficient must be determined, and then it should be used when calculating the static friction coefficient. The friction coefficients are determined by measuring the amplitude of self-excited oscillations of the pendulum. The measurement of the amplitude, for the coefficient of kinetic friction, must be carried out when the sliding friction conditions are, and static – when the conditions of stick-slip phenomenon appear.
Źródło:: TTS Technika Transportu Szynowego; 2015, 12; 1204-1208, CD
1232-3829
2543-5728
Pojawia się w:: TTS Technika Transportu Szynowego
Dostawca treści:: Biblioteka Nauki

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