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Experimental study of aerodynamic damping in arrays of vibrating cantilevers

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Title: Experimental study of aerodynamic damping in arrays of vibrating cantilevers
Authors: Kimber, M. mlk53@pitt.edu, Lonergan, R.1, Garimella, S.V.1
Source: Journal of Fluids & Structures. Nov2009, Vol. 25 Issue 8, p1334-1347. 14p.
Subjects: Aerodynamics, Damping (Mechanics), Cantilevers, Vibration (Aeronautics), Hydraulic couplings, Fluid-structure interaction
Abstract: Abstract: Cantilever structures vibrating in a fluid are encountered in numerous engineering applications. The aerodynamic loading from a fluid can have a large effect on both the resonance frequency and damping, and has been the subject of numerous studies. The aerodynamic loading on a single beam is altered when multiple beams are configured in an array. In such situations, neighboring beams interact through the fluid and their dynamic behavior is modified. In this work, aerodynamic interactions between neighboring cantilever beams operating near their first resonance mode and vibrating at amplitudes comparable to their widths are experimentally explored. The degree to which two beams become coupled through the fluid is found to be sensitive to vibration amplitude and proximity of neighboring components in the array. The cantilever beams considered are slender piezoelectric fans (approximately 6cm in length), and are caused to vibrate in-phase and out-of-phase at frequencies near their fundamental resonance values. Aerodynamic damping is expressed in terms of the quality factor for two different array configurations and estimated for both in-phase and out-of-phase conditions. The two array configurations considered are for neighboring fans placed face-to-face and edge-to-edge. It is found that the damping is greatly influenced by proximity of neighboring fans and phase difference. For the face-to-face configuration, a reduction in damping is observed for in-phase vibration, while it is greatly increased for out-of-phase vibration; the opposite effect is seen for the edge-to-edge configuration. The resonance frequencies also show a dependence on the phase difference, but these changes are small compared to those observed for damping. Correlations are developed based on the experimental data which can be used to predict the aerodynamic damping in arrays of vibrating cantilevers. The distance at which the beams no longer interact is quantified for both array configurations. Understanding the fluid interactions between neighboring vibrating beams is essential for predicting the dynamic behavior of such arrays and designing them for practical applications. [Copyright &y& Elsevier]
Copyright of Journal of Fluids & Structures is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubType: Academic Journal
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  Data: Experimental study of aerodynamic damping in arrays of vibrating cantilevers
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  Data: <searchLink fieldCode="AR" term="%22Kimber%2C+M%2E%22">Kimber, M.</searchLink><i> mlk53@pitt.edu</i><br /><searchLink fieldCode="AR" term="%22Lonergan%2C+R%2E%22">Lonergan, R.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Garimella%2C+S%2EV%2E%22">Garimella, S.V.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="DE" term="%22Aerodynamics%22">Aerodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Damping+%28Mechanics%29%22">Damping (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Cantilevers%22">Cantilevers</searchLink><br /><searchLink fieldCode="DE" term="%22Vibration+%28Aeronautics%29%22">Vibration (Aeronautics)</searchLink><br /><searchLink fieldCode="DE" term="%22Hydraulic+couplings%22">Hydraulic couplings</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid-structure+interaction%22">Fluid-structure interaction</searchLink>
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  Data: Abstract: Cantilever structures vibrating in a fluid are encountered in numerous engineering applications. The aerodynamic loading from a fluid can have a large effect on both the resonance frequency and damping, and has been the subject of numerous studies. The aerodynamic loading on a single beam is altered when multiple beams are configured in an array. In such situations, neighboring beams interact through the fluid and their dynamic behavior is modified. In this work, aerodynamic interactions between neighboring cantilever beams operating near their first resonance mode and vibrating at amplitudes comparable to their widths are experimentally explored. The degree to which two beams become coupled through the fluid is found to be sensitive to vibration amplitude and proximity of neighboring components in the array. The cantilever beams considered are slender piezoelectric fans (approximately 6cm in length), and are caused to vibrate in-phase and out-of-phase at frequencies near their fundamental resonance values. Aerodynamic damping is expressed in terms of the quality factor for two different array configurations and estimated for both in-phase and out-of-phase conditions. The two array configurations considered are for neighboring fans placed face-to-face and edge-to-edge. It is found that the damping is greatly influenced by proximity of neighboring fans and phase difference. For the face-to-face configuration, a reduction in damping is observed for in-phase vibration, while it is greatly increased for out-of-phase vibration; the opposite effect is seen for the edge-to-edge configuration. The resonance frequencies also show a dependence on the phase difference, but these changes are small compared to those observed for damping. Correlations are developed based on the experimental data which can be used to predict the aerodynamic damping in arrays of vibrating cantilevers. The distance at which the beams no longer interact is quantified for both array configurations. Understanding the fluid interactions between neighboring vibrating beams is essential for predicting the dynamic behavior of such arrays and designing them for practical applications. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Journal of Fluids & Structures is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1016/j.jfluidstructs.2009.07.003
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      – Code: eng
        Text: English
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        PageCount: 14
        StartPage: 1334
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      – SubjectFull: Aerodynamics
        Type: general
      – SubjectFull: Damping (Mechanics)
        Type: general
      – SubjectFull: Cantilevers
        Type: general
      – SubjectFull: Vibration (Aeronautics)
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      – SubjectFull: Hydraulic couplings
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      – SubjectFull: Fluid-structure interaction
        Type: general
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      – TitleFull: Experimental study of aerodynamic damping in arrays of vibrating cantilevers
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            NameFull: Kimber, M.
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            NameFull: Lonergan, R.
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              M: 11
              Text: Nov2009
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              Y: 2009
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