Numerical model to analyze the aerodynamic behavior of a combined conical–cylindrical shell

Kerboua, Youcef; Lakis, A. A.

doi:10.1016/j.ast.2016.09.019

Cited by 27 publications

(7 citation statements)

References 41 publications

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“…Unsurprisingly, they undergo large loads in different environments and scenarios, especially when placed inside a fluid or when facing aerodynamic loads. The resulting vibrations can specifically create a strong noise in the surroundings, and are thus required to be fully investigated under such circumstances [13][14][15][16][17]. In this regard, forced and free vibrations of cylindrical shells and mechanical properties of polymer based nanocomposite have been thoroughly investigated in the past, as in the works of [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Sound Transmission Loss of a Honeycomb Sandwich Cylindrical Shell with Functionally Graded Porous Layers

et al. 2022

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To examine the acousto-structural behavior of a sandwich cylindrical shell benefiting from hexagonal honeycomb structures in its core and functionally graded porous (FGP) layers on its outer and inner surfaces, a comprehensive study based on an analytical model which also considers the effect of an external flow is conducted. A homogenous orthotropic model is used for the honeycomb core while its corresponding material features are found from the modified Gibson’s equation. The distribution pattern of FGP parts is either even or logarithmic-uneven, and a special rule-of-mixture relation governs their properties. Based on the first-order shear deformation theory (FSDT), Hamilton’s principle is exploited to derive the final coupled vibro-acoustic equations, which are then solved analytically to allow us to calculate the amount of sound transmission loss (STL) through the whole structure. This acoustic property is further investigated in the frequency domain by changing a set of parameters, i.e., Mach number, wave approach angle, structure’s radius, volume fraction, index of functionally graded material (FGM), and different honeycomb properties. Overall, good agreement is observed between the result of the present study and previous findings.

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Section: Introductionmentioning

confidence: 99%

Sound Transmission Loss of a Honeycomb Sandwich Cylindrical Shell with Functionally Graded Porous Layers

et al. 2022

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“…where w f nP ð Þ , w p mnP ð Þ are, respectively, the state vectors under the external load FP ð Þ and generalized sound pressure K mn . After replacing equation 12by equation (15) and selecting q (q > 2m þ 1) collocation points on the meridian of the surface S, several linear algebraic equations can be described as…”

Section: Numerical Solution Of Acoustic Responsementioning

confidence: 99%

“…1,2 There is a lot of literature research on vibration and sound radiation of various shells (spherical shell, 3 cylindrical shell 4 and conical shell 5 ) and some attentions on the structure dynamic analysis of conical-cylindrical shells have been made public. [6][7][8][9][10][11][12][13][14][15][16][17] Regarding the numerical analysis of sound radiation of submerged elastic structure, several numerical methods such as finite element method (FEM), boundary element method (BEM) and coupled FEM/BEM are available to predict and analyze the acoustic problem. The traditional way of FEM 18 is to transform an infinite domain problem into a finite field problem by defining artificial boundary conditions, while because of its requirement for the Green function, BEM 19 is well suited for the infinite domain problem; The vibration and sound radiation of submerged elastic structures can be predicted directly by coupled FEM and BEM.…”

Section: Introductionmentioning

confidence: 99%

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Experimental studies on the vibro-acoustic behavior of a stiffened submerged conical-cylindrical shell subjected to force and acoustic excitation

Wang

Jiang

Xiong

et al. 2019

Journal of Low Frequency Noise, Vibration and Active Control

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An experimental model was made to investigate the influence of force and acoustic excitation on the vibration and underwater sound radiation of the stiffened conical-cylindrical shell. Meanwhile, a coupled precise transfer matrix method and wave superposition method was also proposed to analyze vibro-acoustic responses of combined shells. To test accuracy of the present method, vibration and acoustic results of combined shells are firstly examined. As expected, results of present method are in excellent agreement with the ones in literature and model test. The experimental results show that free vibrations of the experimental test are consistent with the literature data and the present method’s results. Forced vibration and acoustic test results are also well agreed with the numerical results from the coupled precise transfer matrix method/wave superposition method. The comparisons show that the coupled precise transfer matrix method/wave superposition method is reliable and credible to solve the vibro-acoustic response of combined shells. The analysis shows that the acoustic excitation is the key factor for radiated noise in low-frequency range. However, the radiated noise resulted from force excitation is dominant in mid-high frequency band.

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“…These structures are often exposed to complex service conditions, e.g. severe vibration and axial impact [1–4]. For such applications, it is desirable to construct sandwich-walled cylindrical and conical structures (shells) sandwich structures are known to possess high specific strength, sound absorption performance, high designability, and good heat dissipation capability [5–13].…”

Section: Introductionmentioning

confidence: 99%

Free vibration and axial compression of all-metallic cylindrical and truncated conical sandwich shells with corrugated cores

Yang

Han

et al. 2020

Jnl of Sandwich Structures & Materials

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All-metallic sandwich-walled cylindrical and conical structures for aerospace applications often require simultaneous excellent vibration and load-carrying capacities. In the present study, the free vibration and axial compression behaviors of cylindrical and truncated conical sandwich shells with corrugated cores are investigated using a combined experimental and numerical approach. Excellent agreement between experimental measurements and finite element simulations for representative vibration and axial compression characteristics is achieved. Parametric studies based on the response surface model are subsequently performed to quantify the influence of key geometrical parameters on vibration and axial compression performance. A multi-functional collaborative design to meet the requirement of high load-bearing capacity subjected to the constraint of low natural frequency is also carried out, which demonstrates the unique advantages of the novel sandwich-walled shells for aeronautical and astronautical applications.

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Numerical model to analyze the aerodynamic behavior of a combined conical–cylindrical shell

Cited by 27 publications

References 41 publications

Sound Transmission Loss of a Honeycomb Sandwich Cylindrical Shell with Functionally Graded Porous Layers

Sound Transmission Loss of a Honeycomb Sandwich Cylindrical Shell with Functionally Graded Porous Layers

Experimental studies on the vibro-acoustic behavior of a stiffened submerged conical-cylindrical shell subjected to force and acoustic excitation

Free vibration and axial compression of all-metallic cylindrical and truncated conical sandwich shells with corrugated cores

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