A~Study on Possibility to Apply Piezoelectric Actuators for Active Reduction of Torsional Beams Vibrations

Abstract

In this paper, the results of several tests concerning possible application of piezoelectric elements to reduce torsional vibrations of a beam are presented and discussed. The proposed method of application is a novel one. The piezoelectric elements are positioned in two pairs and glued to the beam at the chosen cross-section. These elements are activated using a harmonically varying voltage of the same amplitude and opposite in phase. Simulations are performed regarding the active reduction of the lowest natural frequencies of vibration of the xed-free beam with the use of piezoelectric actuators. The results of these simulations are obtained by means of the nite element method (ANSYS).

The idea of fuzzy logic usage in a sheet-based FMEA analysis of mechanical systems

“…Another related issues worth investigating more closely are studies on non-classically estimated fuzzy uncertainty e.g. finite element combined with time series [38,39], a fixedeffect approach [40] or a bootstrap simulations [41,42]. Further investigations intend finetuning of the created model parameters and using it to analyse more complex systems.…”

FEM Analysis of Active Reduction of Torsional Vibrations of Clamped-Free Beam by Piezoelectric Elements for Separated Modes

“…If the piezoelectric elements are mounted to the beam in pairs at the same cross-section in such a way that two separated elements are lying on the same side of the beam and the voltages applied to them are in the opposite phase, they produce twisting moments which can be used to reduce torsional vibrations. A possibility for such an application of piezoelectric patches has been positively verified in the study (Augustyn, Kozień, 2014). The design questions usually posed regarding such an application are: the number of piezo elements, their position, and the value (amplitude for the harmonic type of cancellation) of the voltage fed to them.…”

“…(Bismor, 2012;Mazur, Pawełczyk, 2013). The authors propose the idea of applying piezoelectric elements to reduce the torsional vibrations of beams (Augustyn, Kozień, 2014). If the piezoelectric elements are mounted to the beam in pairs at the same cross-section in such a way that two separated elements are lying on the same side of the beam and the voltages applied to them are in the opposite phase, they produce twisting moments which can be used to reduce torsional vibrations.…”

Application of Piezofilms for Excitation and Active Damping of Blade Flexural Vibration

“…The polyvinylidene fluoride (PVDF) film and PZT patch transducers give the possibility to excite the vibration of the thin structures by direct coupling to the structure (Preumont, 2011;Augustyn, 2014;Nader, 2013). It would enable to excite the resonant vibration of blades by time-continuous forces independently of the revolutions.…”