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Vibration of a mistuned three-bladed rotor under regular and chaotic excitations

Warminski J., Latalski J., Szmit Z.

Journal of Theoretical and Applied Mechanics

2018

Vol. 56 nr 2

549--566

This study considers forced vibrations of a rotating structure consisting of a rigid hub and three flexible beams. The blades are nominally made of a multilayered laminate with a specific stacking sequence resulting in full isotropic macroscopic material behaviour. However, in the performed analysis it is assumed that the rotor has been mistuned because of manufacturing tolerances of the composite material. These inaccuracies are represented by deviations of reinforcing fibres orientations from their nominal values. The considered tolerances break the intended macroscopic material isotropy and make the laminate to exhibit the fully orthotropic behaviour. Based on previous authors research, the system of four mutually coupled dimensionless ordinary differential governing equations is adopted. Forced responses of the system under regular and chaotic excitations are investigated.

Dynamics of composite materials cutting

Rusinek R., Kecik K., Warminski J.

Advances in Manufacturing Science and Technology

2011

Vol. 35, nr 3

31-37

The paper presents stability analysis of milling process of epoxide polymer composite material with carbon fibres. In order to determine zones of stable milling, times series of cutting forces are applied. Next, recurrence quantification analysis is conducted which can define three stability indexes: recurrence rate, ratio of recurrence rate to determinism, and recurrence time. Finally, stability lobs diagram for the composite material is proposed.

W pracy zaprezentowano wyniki badania stabilności procesu frezowania kompozytu epoksydowo-polimerowego wzmacnianego włóknem węglowym. Określono obszary skrawania stabilnego. Prowadzono analizę przebiegów czasowych sił skrawania opartą na kwantyfikatorach wykresów rekurencyjnych. Stosowano trzy z nich: recurrence rate, proporcję recurrence rate i determinizmu oraz czas rekurencji. Opracowano wykres stabilności frezowania materiału kompozytowego.