A review of analytical methods for aircraft structures subjected to high-intensity random acoustic loads

Cunningham, Paul; White, Robert G.

doi:10.1243/0954410041872898

Cited by 11 publications

(3 citation statements)

References 21 publications

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“…It was very quickly realized that the complete description of the fatigue process was far too complicated for the theoretical and computational tools available in the '50s, so the first reduced order theoretical models were developed [1,2,3]. Theoretical, numerical and experimental studies on different aspects of this problem have been published over the years [4,5], leading to the most recent studies for acoustic fatigue response prediction in hypersonic flows and a generic description of reduced order methods for aircraft-like structures [6,7].…”

Section: Most Of These Failures Were Minor Ones Related To Additionalmentioning

confidence: 99%

Implicit large eddy simulation of acoustic loading in supersonic turbulent boundary layers

et al. 2017

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This paper investigates the accuracy of implicit Large Eddy Simulation in the prediction of acoustic phenomena associated with pressure fluctuations within a supersonic turbulent boundary layer. We assess the accuracy of implicit Large Eddy Simulation against Direct Numerical Simulation and experiments for attached turbulent supersonic flow with zero-pressure gradient, and further analyze and discuss the effects of turbulent boundary layer pressure fluctuations on acoustic loading both at the high and low frequency regimes. The results of high-order variants of the simulations show good agreement with theoretical models, experiments, as well as previously published Direct Numerical Simulations

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Section: Most Of These Failures Were Minor Ones Related To Additionalmentioning

confidence: 99%

Implicit large eddy simulation of acoustic loading in supersonic turbulent boundary layers

et al. 2017

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“…As for panel-like structures, a review conducted by Cunningham and White 17 indicates that the major part of the dynamic responses depend on the contribution of the first mode, the so-called predominant mode. This theory is still used as a design tool for panel structures subjected to random pressure loading, and the agreement with experimental measurements is satisfactory.…”

Section: Optimization Formulation and Solutionmentioning

confidence: 99%

Dynamic design of stiffeners for a typical panel using topology optimization and finite element analysis

Zhou

Fei

2015

Advances in Mechanical Engineering

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The design of stiffeners is an effective approach to enhance the stiffness of panel-type structures. However, the stiffnessmass efficiency depends largely on the spacing, orientation, and cross-section of the stiffeners. In order to improve the stiffness-mass efficiency, this article presents a combined use of topology optimization and finite element analysis to the dynamic design of stiffeners for a typical panel. Finite element models of a flat and a stiffened rectangular panel were constructed. Modal analysis was conducted on the two panels to obtain the basic dynamic properties. Topology optimization model of the stiffened panel, so-called initial structure, was built based on the variable density method. According to the loading case and the predominant mode of the system, the objective function was determined to maximize the fundamental frequency of the panel. The stiffeners were chosen as the design domain. Optimal material density distributions of the stiffeners were obtained at different mass fraction. The finite element model of the optimal stiffened panel was built to reanalyze the dynamic properties and responses. An increase in the relative rate of change in the fundamental frequency versus mass was observed between before and after the optimization.

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“…Original metal parts were substituted by composite or hybrid structures. It should be underscored that advanced composite parts exposed to acoustic loading and vibration are recently designed as sandwich structures (Cunningham and White, 2004; Nilsson, 2014). However, only a few studies are concerned with dynamic behaviour of a composite panel with the same laminate structure as is the air duct on Figure 1 designed (Talreja, 2016; Gorbatikh and Lomov, 2016).…”

Section: Introductionmentioning

confidence: 99%

Dynamic behaviour of composite panels under acoustic loading

Běhal

Zděnek

2019

IJSI

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Purpose There are structural elements on the aircraft that may be exposed to high-intensity sound levels. One of them is an air inlet duct of the jet engine. To prepare data for the air duct damage tolerance analysis, flat panels were tested under acoustic loading. The paper aims to discuss this issue. Design/methodology/approach The acoustic fatigue test equipment for grazing wave’s incidence was designed based on the FE analyses. Flat composite panels were designed and manufactured using the Hexply 8552/AGP193-PW prepreg with the simulation of production imperfections or operational damage. The dynamic behaviour of panels has been tested using three regimes of acoustic loading: white noise spectrum, engine noise spectrum and discrete harmonic frequencies. The panel deflection was monitored along its longitudinal axis, and the ultrasonic NDT instruments were used for the monitoring of relevant delamination increments. The FE model of the panel was created in Abaqus to study panel dynamic characteristics. Findings No delamination progress was observed by NDT testing even if dynamic characteristics, especially modal frequency, of the panel changed during the fatigue test. Rayleigh damping coefficients were evaluated for their use in FE models. Significant differences were found between the measured and computed panel deflection curves near the edge of the panel. Originality/value The research results underscored the signification of the FE model boundary conditions and the element type selections when the panel works like a membrane rather than a plate because of their low bending stiffness.

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A review of analytical methods for aircraft structures subjected to high-intensity random acoustic loads

Cited by 11 publications

References 21 publications

Implicit large eddy simulation of acoustic loading in supersonic turbulent boundary layers

Implicit large eddy simulation of acoustic loading in supersonic turbulent boundary layers

Dynamic design of stiffeners for a typical panel using topology optimization and finite element analysis

Dynamic behaviour of composite panels under acoustic loading

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