The modal distribution and density of fibre reinforced composite beams

Bachoo, Richard; Bridge, Jacqueline

doi:10.1016/j.jsv.2012.11.027

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…These SEA parameters can be measured by experimental techniques for the vibroacoustic analysis. 2–7 CLF is one of the least amount understood SEA parameter for structural vibration analysis. It describes the transmission of energy from one member to another connected member and can be obtained by several methods such as modal approach and wave approach, 8 Power injection method, 9–11 intensity technique method, 12 power coefficient method, 13 power spectral element method, 14 energy level difference method 15 and statistical modal energy distribution analysis method.…”

Section: Introductionmentioning

confidence: 99%

Statistical energy analysis parameter estimation for different structural junctions of rectangular plates

Bhagwan

Babu

Sawant

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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In industries, the use of appropriate junctions between components is of paramount interest. Coupling loss factor is one of the important parameters in statistical energy analysis for vibroacoustic analysis of complicated structures in drawing board stage. The values of coupling loss factor were calculated and compared for different junctions. The screwed and bolted junctions were examined for thin rectangular plates of same size. The energy level difference method was used to find coupling loss factors because of its simplicity. These experimentally found coupling loss factors were later compared with analytical solutions. It is noticed that the analytical results are in good agreement with experimental results. It is also observed that coupling loss factor for bolted junction are relatively high than that for screwed junction.

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Section: Introductionmentioning

confidence: 99%

Statistical energy analysis parameter estimation for different structural junctions of rectangular plates

Bhagwan

Babu

Sawant

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…14 shows a comparison of the measured and calculated sound power levels of the investigated composites for the (1,3) and (3,1) mode shapes. 5 The differences between the measured and calculated sound power levels are between 0.4 and 1.7 dB, which indicates a very good agreement between the calculation model and the experiment. The eigenfrequencies show a difference up to 9 percent between calculation and measurement due to possible influences of plate manufacturing.…”

Section: Experimental Verificationmentioning

confidence: 62%

“…(Color online) Measured and calculated sound power levels (left) and eigenfrequencies (right) of different multilayered composites 5. The necessary load cases for the analytical calculation have been determined on the basis of scanning laser vibration measurements[20].Please cite this article as: O. Täger, et al, Analytical study of the structural-dynamics and sound radiation of anisotropic multilayered fibre-reinforced composites, Journal of Sound and Vibration (2015), http://dx.doi.org/10.1016/j.jsv.2014.12.040i…”

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confidence: 99%

Analytical study of the structural-dynamics and sound radiation of anisotropic multilayered fibre-reinforced composites

Täger

Dannemann

Hufenbach

2015

Journal of Sound and Vibration

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“…Owing to the increased use of FRCs, particularly in the aerospace and automotive industries, a number of recent studies have analyzed the modal density of anisotropic structural components. Expressions for the modal density have been derived for an anisotropic thin plate, 9 composite panels with orthotropic face sheets, 10 FRC beams coupled in bending and torsion, 11 and composite cylinders. 12 Owing to the influence of shear deformation and rotary inertia on the higher order natural frequencies, some of the previously mentioned studies were extended to derive expressions for the modal density that included both effects.…”

Section: Introductionmentioning

confidence: 99%

Mode count and modal density of nonsymmetric cross-ply laminated composite beams

Bachoo

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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Fiber-reinforced composites are used in many weight critical applications owing to their high strength-to-weight and stiffness-to-weight ratios. In certain applications, fiber-reinforced composites are subjected to broadband excitation sources that act over a significant portion of the audible frequency range leading to the response of a large number of higher order structural modes. In predicting the response levels of such systems, regardless of whether it is modeled in isolation or using a statistical energy analysis framework, it becomes necessary to quantify the number of resonant modes available to receive and store energy within a frequency band. Conventionally, the mode count and modal density are two parameters used for this purpose. Generally, the analysis of the mode count and modal density of anisotropic fiber-reinforced composite structures have received considerably less attention compared to their isotropic metallic counterparts, and as a result a number of key analytical formulations are yet to be derived and investigated. In this work, the modal distribution and density of nonsymmetric cross-ply laminated composite beams coupled in bending and longitudinal extension are analyzed. A wave approach is used to derive an expression for the mode count of the beam having generalized boundary conditions. Using numerical examples and nonlinear regression analysis, simplified expressions are then obtained for the average mode count function of the beam for different boundary conditions. An analytical expression for the modal density is obtained by taking the differential of the average mode count function with respect to frequency. The wave approach employed in this study is validated based on comparison with results from past literature in addition to finite element simulations. The expression for the modal density is also validated using a finite element model and is shown to be independent of boundary conditions.

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The modal distribution and density of fibre reinforced composite beams

Cited by 8 publications

References 10 publications

Statistical energy analysis parameter estimation for different structural junctions of rectangular plates

Statistical energy analysis parameter estimation for different structural junctions of rectangular plates

Analytical study of the structural-dynamics and sound radiation of anisotropic multilayered fibre-reinforced composites

Mode count and modal density of nonsymmetric cross-ply laminated composite beams

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