Damping loss factor estimation of two-dimensional orthotropic structures from a displacement field measurement

Chérif, Raef; Chazot, Jean‐Daniel; Atalla, Noureddine

doi:10.1016/j.jsv.2015.06.042

Cited by 32 publications

(26 citation statements)

References 23 publications

(29 reference statements)

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“…After the material parameters and resonant frequencies are tested, the bending stiffness ratio S and geometrical parameter Y can be achieved by Equation (18) and Equation (19) respectively. The structure loss factor η s can be obtained from the frequency response curve of the sandwich specimen.…”

Section: Eimentioning

confidence: 99%

“…The modal loss factors and shear moduli obtained by three sandwich specimens are compared and illustrated in Figures 11 and 12 With the modal frequencies of base beams measured, the shear moduli of base beams can be achieved. With known densities, thickness and modal frequencies, the bending stiffness ratio S and the geometrical parameter Y can be determined by Equations (18) and (19), respectively. And then according to Equations (21) and (22), the frequency-dependent dynamic mechanical properties of the VDM can be determined.…”

Section: Modal Frequencies and Loss Factors Of Sandwich Specimensmentioning

confidence: 99%

“…The wavenumber method was also implemented by Ichchou et al [18] to obtain effective sandwich structural properties and identify the equivalent models. The displacement field method was developed by Cherif et al [19] to estimate the loss factor of two-dimensional orthotropic structures based on a scanning laser vibrometer measurement. The inverse identification approach was implemented by Barkanov et al [20] to characterize the viscoelastic layers in sandwich panels and was used by Sun et al [21] to evaluate the mechanical parameters of viscoelastic materials.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Dynamic Mechanical Properties of Viscoelastic Materials Based on Asymmetrical Sandwich Beams

Qing-qing¹,

Wang²

2018

Applied Sciences

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A modified estimation method for the dynamic mechanical properties of viscoelastic materials via asymmetrical sandwich specimens is presented. In contrast to the traditional vibrating cantilever beam test method (VCBTM), the proposed method allows asymmetrical base beams in sandwich specimens. Based on the complex stiffness method, complex parameters are introduced for general sandwich configurations. Calculation formulas for loss factor and shear modulus of the core material are presented. The effectiveness of this approach is validated numerically and experimentally by analysis of one symmetrical sandwich beam specimen and two specimens with asymmetrical thicknesses and materials. It is shown that dynamic mechanical parameters of the core material can be obtained regardless of sandwiches' symmetry. The proposed method breaks the symmetrical criteria for sandwich specimens and may provide a wider application to measure viscoelastic materials' dynamic properties.

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Section: Eimentioning

confidence: 99%

Section: Modal Frequencies and Loss Factors Of Sandwich Specimensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on the Dynamic Mechanical Properties of Viscoelastic Materials Based on Asymmetrical Sandwich Beams

Qing-qing¹,

Wang²

2018

Applied Sciences

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“…As the Green functions of anisotropic plates are not analytic anymore, plane waves are used to approximate the field measured on composite plates. A method based on this principle is the Inhomogeneous Wave Correlation (IWC) method [28,29].…”

Section: Introductionmentioning

confidence: 99%

The High-Resolution Wavevector Analysis for the characterization of the dynamic response of composite plates

Margerit

Lebée

Caron

et al. 2019

Journal of Sound and Vibration

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The High Resolution Wavevector Analysis (HRWA) is presented and its application illustrated. Extending the High Resolution Wavenumber Analysis method [1] to 2D signals, it allows the wide-band and local characterization of the linear elastic behavior of anisotropic plates. The method belongs to the family of experimental wavenumber-based characterization methods and uses the high resolution signal processing algorithm ESPRIT (Estimation of Signal Parameters via Rotational Invariance Techniques) and the ESTER criterion (ESTimation of ERror) to overcome some of the limitation of Fourier-based methods. Three experimental applications on composite plate specimens are presented. First (i), from the out-of-plane velocity field of a sandwich plate with a foam core, different wave types (bending, shear and compression) are extracted. The results are compared with numerical predictions. Second (ii), individual layer contributions are separated on a honeycomb sandwich plate by means of the observation of the dependence of the extracted complex wavevectors as a function of wave propagation direction and frequency. Third (iii), a local wavenumber extraction is performed on a 4-layer carbon-epoxy plate made of fiber patches with spatially varying orientations. The local specific bending stiffness of the plate is identified from the extracted wavevectors and compared with theoretical results.

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“…Very recently, Cherif et al [3] used plane waves of the same form, i.e. exp {±ik (θ) (x cos (θ) + y sin (θ))}, to estimate the flexural wavenumber and the damping loss factor of plate structures in two dimensions from a displacement field measurement, which is essentially the same approach as followed by the previously described references.…”

Section: Introductionmentioning

confidence: 99%

Estimation of plate material properties by means of a complex wavenumber fit using Hankel's functions and the image source method

Roozen

Leclère

Ege

et al. 2017

Journal of Sound and Vibration

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This paper presents a new wave fitting approach to estimate the frequency dependent material properties of thin isotropic plate structures from an experimentally obtained vibrational field, exciting the plate at a single point. The method projects the measurement data on to an analytical image source model, in which Hankel's functions are used for a description of the wave fields emanating from the point of excitation, including the reflected wave fields from the edges of the finite plate. By minimizing the error between the projected field and the measured field, varying the complex wave number and the source strengths of the image sources, an optimum fit is searched for. Thus the source strengths of the image sources do not need to be determined theoretically, but are estimated from the fit on to the experimental data instead (thus avoiding difficulties in theoretically assessing the reflection coefficient of the edges of the plate). The approach uses a complex wavenumber fit, enabling the determination of the dynamic stiffness of the plate structure and its damping properties as function of frequency. The method is especially suited for plates with a sufficient amount of damping, excited at high frequencies.

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Damping loss factor estimation of two-dimensional orthotropic structures from a displacement field measurement

Cited by 32 publications

References 23 publications

Study on the Dynamic Mechanical Properties of Viscoelastic Materials Based on Asymmetrical Sandwich Beams

Study on the Dynamic Mechanical Properties of Viscoelastic Materials Based on Asymmetrical Sandwich Beams

The High-Resolution Wavevector Analysis for the characterization of the dynamic response of composite plates

Estimation of plate material properties by means of a complex wavenumber fit using Hankel's functions and the image source method

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