Sound pressure in cylindrical shells with regular orthogonal system of stiffeners excited by a random fields of forces

Efimtsov, B. M.; Lazarev, L. A.

doi:10.1016/j.jsv.2011.03.001

Cited by 15 publications

(10 citation statements)

References 10 publications

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“…The solution for all the three models of a stiffened shell has been considered in [9,10]. This paper does not present cumbersome rigorous calculations.…”

Section: Calculated Relationsmentioning

confidence: 99%

“…Substituting sum (13) under the elementwise square sign and opening the parentheses, it is possible to obtain the expression in which only two dimensional matrices are used at each step [10]. For a shell reinforced only in one direction, the simpler relations are obtained for one group deter mined by phase α and index n. The system of equa tions for generalized displacements and reactions looks as follows:…”

Section: Frames Skinmentioning

confidence: 99%

“…The authors generalized the method to the case of stochastic vibrations in [10] and applied it to calculat ing the sound field within a closed cylindrical shell under the action of the field of near wall pressure fluc tuation of the turbulent boundary layer.…”

Section: Introductionmentioning

confidence: 99%

“…1, 2): orthotropic model with smeared stringers and frames (00), a model with smeared stringers and discrete frames (10) and the most precise and complex model with all discrete ribs (11). Here, in the conditional numbering of the model, 0 means "smearing" and 1 means discreteness; the first number represents ribs frames, and the second, stringers.…”

Section: Introductionmentioning

confidence: 99%

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A complex of analytical models for predicting noise in an aircraft cabin

Efimtsov

Lazarev

2012

Acoust. Phys.

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A series of analytical calculated models for predicting the noise in an aircraft cabin is developed: an orthotropic model, a model with discrete frames, a model with discrete stringers, a model with isolated cells, and a model with a cross system of discrete ribs. The analytical solution is constructed on the basis of the method of space harmonic expansion. Vibrations are represented in the form of double trigonometric series. Strict periodicity allows dividing the series into a large number of independent groups, which makes it possible to effectively perform calculations for large fragments of the fuselage in the entire frequency region both for deterministic and random external force fields.

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“…The solution for all the three models of a stiffened shell has been considered in [9,10]. This paper does not present cumbersome rigorous calculations.…”

Section: Calculated Relationsmentioning

confidence: 99%

Section: Frames Skinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A complex of analytical models for predicting noise in an aircraft cabin

Efimtsov

Lazarev

2012

Acoust. Phys.

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“…Mead and Bardell [4] examined the wave propagation of cylindrical shells reinforced by stringers and computed the propagation constants for two different stiffener crosssections. Efimtsov and Lazarev [5,6] studied the forced vibration and internal sound pressure of cylindrical shells with a regular orthogonal system of stiffeners by using the space harmonic expansion and presented the radial displacement snapshot of the stiffened cylindrical shells. Hull [7] developed a threedimensional elastic response analytical model of a cylinder with multiple longitudinal stiffeners.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Radiation From Thick Laminated Cylindrical Shells With Sparse Cross Stiffeners

Xu¹,

Ma²,

2013

Journal of Vibration and Acoustics

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A general method for predicting acoustic radiation from multiple periodic structures is presented and a numerical solution is proposed to find the radial displacement of thick laminated cylindrical shells with sparse cross stiffeners in the wavenumber domain. Although this method aims at the sound radiation from a single stiffened cylindrical shell, it can be easily adapted to analyze the vibrational and sound characteristics of two concentric cylindrical shells or two parallel plates with complicated periodic stiffeners, such as submarine and ship hulls. The sparse cross stiffeners are composed of two sets of parallel rings and one set of longitudinal stringers. The acoustic power of large cylindrical shells above the ring frequency is derived in the wavenumber domain on the basis of the fact that sound power is focused on the acoustic ellipse. It transpires that a great many band gaps of wave propagation in the helical wave spectra of the radial displacement for stiffened cylindrical shells are generated by the rings and stringers. The acoustic power and input power of stiffened antisymmetric laminated cylindrical shells are computed and compared. The acoustic energy conversion efficiency of the cylindrical shells is less than 10%. The axial and circumferential point forces can also produce distinct acoustic power. The radial displacement patterns of the antisymmetric cylindrical shell with fluid loadings are illustrated in the space domain. This study would help to better understand the main mechanism of acoustic radiation from stiffened laminated composite shells,

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Turbulent Flow-Excited Vibrations of a Shallow Cylindrical Shell

Elishakoff¹

2020

Dramatic Effect of Cross-Correlations in Random Vibrations of Discrete Systems, Beams, Plates, and Shells

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Sound pressure in cylindrical shells with regular orthogonal system of stiffeners excited by a random fields of forces

Cited by 15 publications

References 10 publications

A complex of analytical models for predicting noise in an aircraft cabin

A complex of analytical models for predicting noise in an aircraft cabin

Acoustic Radiation From Thick Laminated Cylindrical Shells With Sparse Cross Stiffeners

Turbulent Flow-Excited Vibrations of a Shallow Cylindrical Shell

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