An energy finite element formulation for high-frequency vibration analysis of externally fluid-loaded cylindrical shells with periodic circumferential stiffeners subjected to axi-symmetric excitation

Zhang, Weiguo; Vlahopoulos, Nickolas; Wu, Kuangcheng

doi:10.1016/j.jsv.2004.03.063

Cited by 39 publications

(11 citation statements)

References 23 publications

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“…Automotive body panels, which are made of steel sheets press-molded into a required form, are laminated with damping materials to reduce the vibration level. Furthermore, porous media, resin sheets (surface), and carpet are laminated onto the damping materials (Davy et al, 2014;Pockszevnicki et al, 2011;Zhang et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Cavity Damping on Vehicular Evaluation using the Finite Element Method

Ferreira¹,

Magalhães²,

Moura³

et al. 2016

Archives of Acoustics

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This work focuses on finding a numerical solution for vehicle acoustic studies and improving the usefulness of the numerical experimental parameters for the development stage of a new automotive project. Specifically, this research addresses the importance of modal cavity damping for vehicle exerts during numerical studies. It then seeks to suggest standardized parameter values of modal cavity damping in vehicular acoustic studies.The standardized value of modal cavity damping is of great importance for the study of vehicular acoustics in the automotive industry because it would allow the industry to begin studies of the acoustic performance of a new vehicle early in the conception phase with a reliable estimation that would be close to the final value measured in the design phase. It is common for the automotive industry to achieve good levels of numerical-experimental correlation in acoustic studies after the prototyping phase because this phase can be studied with feedback from the simulation and experimental modal parameters.Thus, this research suggests values for modal cavity damping, which are divided into two parts due to their behaviour: ξ(x) = −0.0126(x − 100) + 6.15 as a variable function to analyse up to 100 Hz and 6.15% of modal cavity damping constant for studies between 30 Hz and 100 Hz.The sequence of this study shows how we arrived at these values.

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Section: Introductionmentioning

confidence: 99%

The Effect of the Cavity Damping on Vehicular Evaluation using the Finite Element Method

Ferreira¹,

Magalhães²,

Moura³

et al. 2016

Archives of Acoustics

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“…The EFEA is an emerging technology for analyzing complex structural-acoustic systems [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The EFEA utilizes the spatially averaged vibrational or acoustic energy as a primary variable for developing governing differential equations for each wave type present within a system.…”

Section: Introductionmentioning

confidence: 99%

Energy Finite Element Analysis Developments for Vibration Analysis of Composite Aircraft Structures

Vlahopoulos

Schiller²,

Lee

2011

SAE Int. J. Aerosp.

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The Energy Finite Element Analysis (EFEA) has been utilized successfully for modeling complex structural-acoustic systems with isotropic structural material properties. In this paper, a formulation for modeling structures made out of composite materials is presented. An approach based on spectral finite element analysis is utilized first for developing the equivalent material properties for the composite material. These equivalent properties are employed in the EFEA governing differential equations for representing the composite materials and deriving the element level matrices. The power transmission characteristics at connections between members made out of non-isotropic composite material are considered for deriving suitable power transmission coefficients at junctions of interconnected members. These coefficients are utilized for computing the joint matrix that is needed to assemble the global system of EFEA equations. The global system of EFEA equations is solved numerically and the vibration levels within the entire system can be computed. The new EFEA formulation for modeling composite laminate structures is validated through comparison to test data collected from a representative composite aircraft fuselage that is made out of a composite outer shell and composite frames and stiffeners. NASA Langley constructed the composite cylinder and conducted the test measurements utilized in this work.

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“…The edges of the pass bands as a function of circumferential wavenumber were especially well predicted. Zhang et al [12] developed a hybrid method based on an energy finite element formulation to predict the high-frequency vibration response of fluid-loaded cylindrical shells with periodic circumferential stiffeners. Added mass and radiation effects related to the surrounding exterior fluid medium were taken into account but the radiated pressure in the fluid was not estimated.…”

Section: Introductionmentioning

confidence: 99%

Wavenumber space and physical space responses of a periodically ribbed plate to a point drive: A discrete approach

Maxit¹

2009

Applied Acoustics

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An energy finite element formulation for high-frequency vibration analysis of externally fluid-loaded cylindrical shells with periodic circumferential stiffeners subjected to axi-symmetric excitation

Cited by 39 publications

References 23 publications

The Effect of the Cavity Damping on Vehicular Evaluation using the Finite Element Method

The Effect of the Cavity Damping on Vehicular Evaluation using the Finite Element Method

Energy Finite Element Analysis Developments for Vibration Analysis of Composite Aircraft Structures

Wavenumber space and physical space responses of a periodically ribbed plate to a point drive: A discrete approach

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