Eddy Current Damper for Turbine Blading: Electromagnetic Finite Element Analysis and Measurement Results

Laborenz, Jacob; Krack, Malte; Panning, Lars; Wallaschek, Jörg; Denk, Markus; Masserey, Pierre-Alain

doi:10.1115/gt2011-45242

Cited by 4 publications

(4 citation statements)

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“…The relative movement between the permanent magnets and the copper plates induces eddy currents in both the upper and the lower copper plates. These eddy currents circulate in such a way that they induce a magnetic field with an opposite polarity as the applied field, causing an electromagnetic force which damps the relative velocity between the permanent magnets and the copper plates, 24 therefore leading to an improved spindle damping property. Once the spindle damping is increased, the spindle vibration and the tool tip vibration will attenuate accordingly.…”

Section: Proposed Methodology For Vibration Suppression In Robotic Millingmentioning

confidence: 99%

Design of eddy current dampers for vibration suppression in robotic milling

Fan

Zhao

2018

Advances in Mechanical Engineering

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The milling robot normally has a low stiffness which may easily cause chatter during machining. This article presents a novel eddy current damper design for chatter suppression in the robotic milling process. The designed eddy current dampers are installed on the milling spindle to damp the tool tip vibrations. The structural design and the working principle of the eddy current dampers are explained. The magnetic flux density distribution and the magnetic force generation of the designed eddy current damper are analyzed with the finite element method. The tool tip dynamics without and with eddy current dampers are modeled, and the damping performance of the proposed eddy current dampers in the robotic milling process is verified through both simulations and experiments. The results show that the peaks of the tool tip frequency response function caused by the milling tool modes are damped significantly, and the stable depth of cut is improved greatly with eddy current dampers.

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Section: Proposed Methodology For Vibration Suppression In Robotic Millingmentioning

confidence: 99%

Design of eddy current dampers for vibration suppression in robotic milling

Fan

Zhao

2018

Advances in Mechanical Engineering

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“…Also, the application of active or semi-active vibration control strategies is hampered by the requirement of fail-safe operation. Noteworthy alternatives to friction damping include piezoelectric shunt damping [58,178], eddy current damping [88,87], viscoelastic material damping of coatings [177,60], and impact or particle damping. Friction damping takes place in mechanical joints that are either inherent to bladed disks, such as the ones between blades and roots, or can be introduced additionally, e. g. in the form of underplatform dampers.…”

Section: Means Of Vibration Reductionmentioning

confidence: 99%

Vibration Prediction of Bladed Disks Coupled by Friction Joints

Krack

Salles

Thouverez

2016

Arch Computat Methods Eng

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196

124

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The present review article addresses the vibration behavior of bladed disks encountered e. g. in aircraft engines as well as industrial gas and steam turbines. The utilization of the dissipative effects of dry friction in mechanical joints is a common means of the passive mitigation of structural vibrations caused by aeroelastic excitation mechanisms. The prediction of the vibration behavior is a scientific challenge due to (a) the strongly nonlinear and non-uniform contact interactions involving local sticking, sliding and liftoff, (b) topological complexity of the coupled structure, and (c) the multidisciplinary character of the problem associated with the need to account for structural mechanical as well as fluid dynamical effects. The purpose of this article is the overview and discussion the current state of the art of vibration prediction approaches. The modeling approaches in this work embrace the description of the rotating bladed disk, the contact modeling, the consideration of aeroelastic effects, appropriate model reduction techniques and the exploitation of the rotationally periodic nature of the problem. The simulation approaches cover the direct computation of periodic, steady-state externally forced and self-excited vibra

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“…Previously, several techniques have been used for the vibration control of the bladed disks such as friction‐based damping, 1,2 viscoelastic damping, 3 hard coating on the blade surface, 4 contactless eddy current damper, 5 electromagnetic damping using actively controlled magnets, 6 using self‐tuning impact dampers, 7 and integrating the damping materials into the hollow blades 8 . Mokrani 9 demonstrated an interesting experimental approach using piezoelectric patches on the bladed rail structure to damp family of modes passively by optimal shunt damping techniques.…”

Section: Introductionmentioning

confidence: 99%

High modal density active vibration attenuation of bladed structure with a decentralized optimal negative derivative feedback controller

Jamshidi

Paknejad

Collette

2022

Structural Contr & Hlth

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In this study, an active vibration mitigation of bladed structures with piezoelectric patches utilizing decentralized negative derivative feedback (NDF) controllers is evaluated numerically and experimentally. Such structures have protruding identical blades, which create numerous modes in a short interval of frequency named as high modal density or mode family. Therefore, mitigating these modes is quite challenging. As a case study, a bladed rail is considered with 5 blades, which subsequently has 5 modes in a family of mode in a very short frequency range. A numerical model of the bladed rail including 5 pairs of piezoelectric patches (sensors and actuators) is extracted. Afterwards, a decentralized NDF controller is designed based on maximum damping and H 2 method for this model, which is desirable for reducing vibration corresponding to the first family mode. The numerical results show a perfect performance of the proposed controller on high modal density vibration attenuations. For validating these results, two separate bladed rails have been manufactured, and different piezoelectric patches have been attached to them. The same procedure for designing NDF controller has been done for both of the structures. Experimental results show that the family mode of the bladed rail is completely damped using decentralized NDF controller. Even though the pole-zero patterns change from the first structure to the second one, the controller can easily mitigate the family mode vibration flawlessly. This shows high applicability of proposed controller on mitigating high modal density modes. K E Y W O R D S bladed rail, decentralized controller, family mode, high modal density, negative derivative feedback (NDF), piezoelectric sensor/actuators 1 | INTRODUCTION Bladed structures are very common in various industries like aviation and turbomachinery industry. The new modernized industry is focusing on the development of energy-efficient structures to reduce the fuel consumption, currently. Therefore, lightweight structures with materials such as aluminum are extensively used, in these applications. While

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Eddy Current Damper for Turbine Blading: Electromagnetic Finite Element Analysis and Measurement Results

Cited by 4 publications

References 0 publications

Design of eddy current dampers for vibration suppression in robotic milling

Design of eddy current dampers for vibration suppression in robotic milling

Vibration Prediction of Bladed Disks Coupled by Friction Joints

High modal density active vibration attenuation of bladed structure with a decentralized optimal negative derivative feedback controller

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