scholarly journals Parallel Piezoelectric Shunt Damping of Rotationally Periodic Structures

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Bilal Mokrani ◽  
Renaud Bastaits ◽  
Mihaita Horodinca ◽  
Iulian Romanescu ◽  
Ioanica Burda ◽  
...  
Keyword(s):  
Circular Plate ◽  
Periodic Structure ◽  
Periodic Structures ◽  
Piezoelectric Transducers ◽  
Specific Mode ◽  
Parallel Loops ◽  
Shunt Damping ◽  
Independent Loops ◽  
Piezoelectric Shunt ◽  
Rotationally Periodic Structure

This paper considers the RL shunt damping of rotationally periodic structures with an array of regularly spaced piezoelectric patches. The technique is targeted to the damping of a specific mode withnnodal diameters. For this particular case, one can take advantage of the shape of the targeted mode to organize the piezoelectric patches as a modal filter (in parallel loops) which reduces the demand on the inductors of the tuned inductive shunt. In the case of a perfectly rotationally periodic structure, it is possible to organize 4npiezoelectric transducers (PZT patches) in two parallel loops of 2npatches each. In this way, the demand on the inductors is reduced by4n2as compared to independent loops, which may allow a fully passive integration of the RL shunt in a turbomachinery application. The method is first illustrated experimentally on a circular plate; it is then applied to a prototype of an industrial bladed drum. The influence of blade mistuning is investigated.

scholarly journals Passive Damping of Rotationally Periodic Structures with Tuned Piezoelectric Inductive Shunt

Actuators ◽  
2018 ◽  
Vol 7 (3) ◽  
pp. 41 ◽  
Author(s):  
Bilal Mokrani ◽  
Renaud Bastaits ◽  
Iulian Romanescu ◽  
Mihaita Horodinca ◽  
Ioan Burda ◽  
...  
Keyword(s):  
Circular Plate ◽  
Periodic Structures ◽  
Mode Shapes ◽  
Passive Damping ◽  
Specific Mode ◽  
Parallel Loops ◽  
Shunt Damping ◽  
Independent Loops

This paper considers the piezoelectric resistive and inductive RL shunt damping applied to rotationally periodic structures equipped with an array of regularly spaced piezoelectric patches. A method for simplifying the hardware, by reducing the size of the inductors and eliminating the use of synthetic inductors, is described. The paper compares two different ways of using the piezoelectric array: independent loops and parallel loops. It shows that, if a specific mode with n nodal diameters is targeted, mounting 4n piezoelectric patches in two parallel loops is as efficient as mounting them in 4n independent loops, while considerably reducing the demand on the inductors, L, (by 4n2). The method takes advantage of the mode shapes of rotationally periodic structures. The proposed method is validated numerically and experimentally on a rotationally periodic circular plate (nearly axisymmetric). The proposed technique is aimed at turbomachinery applications.

Excitation of Rotationally Periodic Structures

1979 ◽  
Vol 46 (4) ◽  
pp. 878-882 ◽  
Author(s):  
S. J. Wildheim
Keyword(s):  
Periodic Structure ◽  
Periodic Structures ◽  
Resonance Condition ◽  
Forced Response ◽  
Closed Ring ◽  
Additional Resonance ◽  
Rotationally Symmetric ◽  
Deformation Patterns ◽  
Frequency Diagram ◽  
Rotationally Periodic Structure

A rotationally periodic structure consists of a finite number of identical substructures forming a closed ring. The vibrational behavior of such structures is considered, especially the forced response due to a rotating force. It is known that for a rotationally symmetric structure, excited by a rotating force, resonance for the n nodal diameters mode is obtained when the corresponding natural frequency is ωn = nΩ, where Ω is the angular velocity of the force. This resonance condition also holds for a rotationally periodic structure. But then additional resonance possibilities exist, given by ωn = (kN ± n)Ω, where N is the number of substructures and k = 0, 1, 2,… These resonance conditions give a zigzag line in the nodal diameters versus frequency diagram, which here is introduced as the ZZENF diagram. The deformation patterns at the resonances are both forward and backward traveling waves.

Power Harvesting Piezoelectric Shunt Damping 1

2002 ◽  
Vol 35 (2) ◽  
pp. 173-178 ◽  
Author(s):  
A.J. Fleming ◽  
S.O.R. Moheimani
Keyword(s):  
Power Harvesting ◽  
Shunt Damping ◽  
Piezoelectric Shunt

Experimental Implementation of Negative Impedance Shunts on Periodic Structures

2009 ◽  
Author(s):  
Benjamin Beck ◽  
Kenneth A. Cunefare ◽  
Massimo Ruzzene ◽  
Manuel Collet
Keyword(s):  
Periodic Structures ◽  
Experimental Results ◽  
Periodic Array ◽  
Negative Capacitance ◽  
Experimental Implementation ◽  
Theoretical Predictions ◽  
Shunt Damping

Shunt damping of structures has been heavily researched, both passively and actively. Negative capacitance shunts actively control vibration on a structure and have been shown to obtain significant broadband suppression. The use of smaller piezoelectric patches, implemented in a periodic array, can alter the behavior of the control. Assorted shunt arrangements as well as circuit configurations will be investigated. Experimental results will be compared to theoretical predictions of shunt performance.

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