On Large Deflection Analysis in Acoustic Fatigue Design

Mei, Chuh; Wolfe, H. F.

doi:10.1016/b978-0-444-42665-9.50023-2

Cited by 17 publications

(3 citation statements)

References 28 publications

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“…In two previous experiments, two clamped square aluminum plates were tested in the Wideband Noise Test Chamber of the Flight Dynamics Laboratory Sonic Fatigue Facility at WPAFB. The mean-square strains versus non-dimensional Sound Pressure Level (SPL) showed good agreement among the PDE/Galerkin/Equivalent Linearization (EL) analytical results and the experimental data [2,9]. A steel beam rigidly clamped in a clamping fixture and mounted on a vibration shaker was also recently tested.…”

Section: Introductionmentioning

confidence: 71%

“…Currently the random acoustic pressure for sonic fatigue design and analysis of beam, plate [1,2,3,4,5,6,7] and shallow shell [8] structures (linear or non-linear) is often considered uniformly distributed over the surface of the structure and synchronized in time. In addition, the random loading is generally assumed as a truncated Gaussian white noise.…”

Section: Introductionmentioning

confidence: 99%

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Response of plates under statistically unsynchronized uniform random loads using Monte-Carlo simulation

Dhainaut¹,

Cheng²,

Mei³

2014

JCAM

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Classic solutions of the responses of plates subjected to uniform random pressure are generally confined to simple boundary conditions where the assumed mode shape solutions are known. Even in those simple cases, response solutions have neglected the asymmetric modes for rectangular plates with symmetric boundary conditions due to mathematical limitations. To the best know;edge of the authors, the present paper presents for the first time the random response and fatigue life prediction for plates subjected to unsynchronized and statistically uncorrelated uniform random loads. A linear finite element formulation combined with the Monte Carlo simulation is employed to determine the stress response, and the stochastic Palmgrem-Miner reliability model is used for the fatigue analysis. A simply supported rectangular plate is studied first in detail to show the contributions of both symmetric and asymmetric modes due to the unsynchronized loading. A clampedsimply supported plate is analyzed next to show the versatility of the present approach. In both cases, a significant reduction on the responses and increase in fatigue life was observed as compared to corresponding results from the uniform synchronized loading condition. Results also include RMS displacement and stress values, power spectral densities, probability density functions, and rainflow plots. Computational burden due to the unsynchronized random pressure fluctuations required the use of parallel computing capabilities.

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Section: Introductionmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Response of plates under statistically unsynchronized uniform random loads using Monte-Carlo simulation

Dhainaut¹,

Cheng²,

Mei³

2014

JCAM

Self Cite

View full text Add to dashboard Cite

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“…Atypical aircraft panel can be thin-walled cylinder shell or subsequently curved due to mechanical loads, thermal loads and so on, and the static and dynamic behavior in the transverse direction can be highly nonlinear for curved panels or cylinder shell. Previous work on nonlinear response due to intense broadband acoustic excitation was mainly confined to the hardening-spring behavior of flat panels [5,6]. The experimental work on nonlinear responses of curved panels under acoustic excitations was done by Holehouse [7], Ng and White [8].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Thin-Walled Structures to Thermal Loadings and Random Acoustic Excitations

Zhao

Sha

Luan

et al. 2014

AMR

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Hypersonic aircrafts are facing increasingly severe aerodynamic heating, noise and so on, which will lead to nonlinear vibration characteristics for thin-walled structures of hypersonic aircrafts. Considering the influence of thermo-acoustic loadings, finite element formulation of simply supported plate under combined thermo-acoustic loadings are founded, and vibration characteristics of simply supported plate under thermal loadings with temperature gradient and random acoustic loadings are investigated. According to finite element numerical method, modal frequencies, critical thermal buckling temperature difference, dynamic stress response of simply supported plates with temperature gradient under combined thermo-acoustic loadings were calculated before and after thermal buckling. The results show that three types of motion: random vibrations around initial equilibrium position in pre-buckling region, snap-through oscillations between two post-buckling equilibrium positions, nonlinear vibrations around one of the two post-buckling equilibrium position, and The RMS of nodes for different locations of the simply plate are obtained in pre-buckling post-buckling region, and it is shown that different interaction of tensile bend stress, compressive stress and compressive thermal stress lead to different RMS trends.

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Simulation of jet-noise excitation in an acoustic progressive wave tube facility

Steinwolf

White

Wolfe

2001

The Journal of the Acoustical Society of America

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Acoustic excitation produced by jet-engine effluxes was simulated in a progressive wave tube (APWT) facility with a computer-based control system. The APWT siren is driven by a signal generated numerically in a PC and then converted into analog form. Characteristics of the acoustic pressure measured by a microphone are analyzed in digital form and compared with those prescribed for simulation. Divergence is compensated by immediate modification of the driving signal and this action is repeated in the form of iterative process until the test specification is attained. Typical power spectral density (PSD) shapes with maxima at low and high frequencies were simulated. A "tailoring" approach has been also achieved when a test specification was determined directly from field measurements for the particular aircraft under consideration. Since acoustic pressure signals of high level differ from the Gaussian random process model, particularly in terms of asymmetric probability density function, a method has been developed to make the driving signal also non-Gaussian by simulating skewness and kurtosis parameters of the APWT acoustic excitation simultaneously with PSD control. Experimental results with Gaussian and non-Gaussian characteristics obtained for various PSD specifications including sharp and narrow peaks are presented in the paper.

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On Large Deflection Analysis in Acoustic Fatigue Design

Cited by 17 publications

References 28 publications

Response of plates under statistically unsynchronized uniform random loads using Monte-Carlo simulation

Response of plates under statistically unsynchronized uniform random loads using Monte-Carlo simulation

Dynamic Response of Thin-Walled Structures to Thermal Loadings and Random Acoustic Excitations

Simulation of jet-noise excitation in an acoustic progressive wave tube facility

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