Thermal effects on the sound transmission through aerospace composite structures

Chronopoulos, Dimitrios; Ichchou, Mohamed; Troclet, Bernard; Bareille, Olivier

doi:10.1016/j.ast.2013.08.003

Cited by 27 publications

(15 citation statements)

References 20 publications

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“…Toward this objective, these structures are typically made thin and as a result, they are considerably flexible. Examples of these flexible lightweight structures are composite layers [1,2] and aluminum plates [3,4]. These flexible components are very important elements of space structures, and any applied disturbance that could lead to higher amplitude oscillations can result in malfunctions in these systems.…”

Section: Introductionmentioning

confidence: 99%

Vibration reduction in aerospace structures via an optimized modified positive velocity feedback control

Omidi

Mahmoodi

Shepard

2015

Aerospace Science and Technology

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Section: Introductionmentioning

confidence: 99%

Vibration reduction in aerospace structures via an optimized modified positive velocity feedback control

Omidi

Mahmoodi

Shepard

2015

Aerospace Science and Technology

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“…The numerical analysis of wave propagation within periodic structure is introduced in [6] and extended to formulate the wave finite element (WFE) method in [7]. The WFE has recently found application in predicting the vibroacoustic and dynamic properties of composite MATEC Web of Conferences 211, 19005 (2018) https://doi.org/10.1051/matecconf/201821119005 VETOMAC XIV panels and shells [8][9][10][11][12] with complex periodic structures [13,14] having been investigated. The variability of vibroacoustic transmission through layered structures [16] and structural identification [17] have also been considered.…”

Section: Introductionmentioning

confidence: 99%

The influence of temperature on wave scattering of damaged segments within composite structures

2018

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The increased use of composite materials in modern aerospace and automotive structures, and the broad range of launch vehicles’ operating temperature imply a great temperature range for which the structures has to be frequently and thoroughly inspected. A thermal mechanical analysis is used to experimentally measure the temperature-dependent mechanical properties of a composite layered panel in the range of -100°C to 150°C. A hybrid wave finite element/finite element computational scheme is developed to calculate the temperature-dependent wave propagation and interaction properties of a system of two structural waveguides connected through a coupling joint. Calculations are made using the measured thermomechanical properties. Temperaturedependent wave propagation constants of each structural waveguide are obtained by the wave finite element approach and then coupled to the fully finite element described coupling joint, on which damage is modelled, in order to calculate the scattering magnitudes of the waves interaction with damage across the coupling joint. The significance of the panel’s glass transition range on the measured and calculated properties is emphasised. Numerical results are presented as illustration of the work.

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“…The WFE has recently found applications in predicting the vibroacoustic and dynamic performance of composite panels and shells [9][10][11] , with complex periodic structures [12,13] having been investigated. The variability of vibroacoustic transmission through layered structures [14][15][16], as well as structural identification [17] have also been considered.…”

Section: Introductionmentioning

confidence: 99%

A wave and finite element methodology for structural identification in layered composite structures

2018

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In this work we present for the first time an approach for identifying the geometric and material characteristics of layered composite structures through an inverse wave and finite element approach. More specifically, this Non-Destructive Evaluation (NDE) approach is able to recover the thickness, density, as well as all independent mechanical characteristics such as the tensile and shear moduli for each layer of the composite structure under investigation. This is achieved through multi-frequency single shot measurements. It is emphasized that the success of the approach is independent of the employed excitation frequency regime, meaning that both structural dynamics and ultrasound frequency spectra can be employed. It is demonstrated that more efficient convergence of the identification process is attained closer to the bending-to-shear transition range of the layered structure. Since a full FE description is employed for the periodic composite, the presented approach is able to account for structures of arbitrary complexity. The procedure is applied to a sandwich panel with composite facesheets and results are compared with two wave-based characterization techniques: the Inhomogeneous Wave Correlation method and the Transition Frequency Characterization method. Numerical simulations and experimental results are presented to verify the robustness of the proposed method.

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Thermal effects on the sound transmission through aerospace composite structures

Cited by 27 publications

References 20 publications

Vibration reduction in aerospace structures via an optimized modified positive velocity feedback control

Vibration reduction in aerospace structures via an optimized modified positive velocity feedback control

The influence of temperature on wave scattering of damaged segments within composite structures

A wave and finite element methodology for structural identification in layered composite structures

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