Multi objective optimization of sound transmission across laminated composite cylindrical shell lined with porous core investigating Non-dominated Sorting Genetic Algorithm

The increasing motivation behind the recently wide industrial applications of sandwich and composite double panel structures stems from their ability to absorb sounds more effectively. Meticulous selection of the geometrical and material constituents of both the core and panels of these structures can produce highly desirable properties. A good understanding of their vibro-acoustic response and emission index such as the sound transmission loss (STL) is, therefore, a requisite to producing optimal design. In this study, an overview of recent advances in STL of sandwich and composites double panels is presented. At first, some salient explanation of the various frequency and controlled regions are given. It then critically examines a number of parameter effects on the STL of sandwich and composite structures. Literatures on the numerical, analytical and experimental solutions of STL are systematically presented. Efficient and more reliable optimization problems that maximize the STL and minimize the objective functions capable of degrading the effectiveness of the structure to absorb sounds are also provided.

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“…Transition frequency where a reduction in STL first occurs especially for curved panels. [33,34] Critical…”

Section: Symbol Formula Definition Referencementioning

confidence: 99%

“…Dip frequency where the circumferential wave number and mode per radius of shell become equal. [34,35] Coincidence…”

Section: Symbol Formula Definition Referencementioning

confidence: 99%

Comparative Study of Sound Transmission Losses of Sandwich Composite Double Panel Walls

2020

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“…In another work, third order shear deformation theory as a one of the derivate of higher order theories was considered to obtain power transmission through laminated composite cylindrical shell in the presence of external flow. Following the last works, Talebitooti et al (2017a and2018b) determined STL of the multilayered cylindrical shell so that in the first model 3D elasticity theory was employed for the special case of double-walled composite shell subjected to porous material. On the other hand, Non-dominated sorting Genetic algorithm was applied in another work for optimization of STL through cylinder interlayered with porous material.…”

Section: Introductionmentioning

confidence: 99%

Investigating Hyperbolic Shear Deformation Theory on vibroacoustic behavior of the infinite Functionally Graded thick plate

Talebitooti

Zarastvand

Rouhani

2019

Lat. Am. j. solids struct.

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This paper applies acoustic analysis of Sound Transmission Loss (STL) through infinite Functionally Graded (FG) thick plate employing Hyperbolic Shear Deformation Theory (HSDT). The procedure for applying a FG plate is followed by considering the material properties are changed continually based on power-law distribution of the materials in terms of volume fraction. The main benefit of HSDT can be justified knowing the fact that, it uses parabolic transverse shear strain across thickness direction. Therefore, no need to enter the extra effect of shear correction coefficient factor. Besides, the displacement field is extended as a combination of polynomial as well as hyperbolic tangent function by neglecting the effect of thickness stretching. Furthermore, the equations of motion are obtained employing Hamilton's Principle. To provide an analytical solution based on HSDT, equations of motion are combined with acoustic wave equations. Moreover, some comparisons are made with the known theoretical and experimental results available in literature to verify the accuracy and efficiency of the current formulation. These comparisons reveal an excellent agreement. Consequently, some configurations are presented to demonstrate which parameters appear to be effective to improve the behavior of STL including the effects of modulus of elasticity and density in the thickness direction with respect to various power-law distributions.

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“…Ghassabi et al [24] presented the solution strategy based on the state vector technique to study the vibroacoustic performance of carbon nanotube-(CNT-) reinforced composite doubly curved thick shells by three-dimensional theory. Talebitooti et al [25] conducted the nondominated sorting genetic algorithm to optimize sound transmission loss of the laminated composite cylindrical shell by FSDST. Ghassabi et al [26] investigated the vibroacoustic performance of the doubly curved thick shell by the three-dimensional sound propagation approach and state space solution.…”

Section: Introductionmentioning

confidence: 99%

Wave‐Based Method for Free Vibration Analysis of Orthotropic Cylindrical Shells with Arbitrary Boundary Conditions

Pang

Huo

et al. 2019

Mathematical Problems in Engineering

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The wave-based method (WBM) is a feasible method which investigates the free vibration characteristics of orthotropic cylindrical shells under general boundary conditions. Based on Reissner–Naghid’s shell theory, the governing motion equation is established, and the displacement variables are transformed into wave functions formed to satisfy the governing equations. On the basis of the kinematic relationship between the force resultant and displacement vector, the overall matrix of the shell is established. Comparison studies of this paper with the solutions in the literatures were carried out to validate the accuracy of the present method. Furthermore, by analyzing some numerical examples, the free vibration characteristics of orthogonal anisotropic cylindrical shells under classical boundary conditions, elastic boundary conditions, and their combinations are studied. Also, the effects of the material parameter and geometric constant on the natural frequencies for the orthotropic circular cylindrical shell under general boundary conditions are discussed. The conclusions obtained can be used as data reference for future calculation methods.

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Multi objective optimization of sound transmission across laminated composite cylindrical shell lined with porous core investigating Non-dominated Sorting Genetic Algorithm

Cited by 102 publications

References 33 publications

Comparative Study of Sound Transmission Losses of Sandwich Composite Double Panel Walls

Comparative Study of Sound Transmission Losses of Sandwich Composite Double Panel Walls

Investigating Hyperbolic Shear Deformation Theory on vibroacoustic behavior of the infinite Functionally Graded thick plate

Wave‐Based Method for Free Vibration Analysis of Orthotropic Cylindrical Shells with Arbitrary Boundary Conditions

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