Multi-objective optimization approach on diffuse sound transmission through poroelastic composite sandwich structure

Abstract

Multi-objective vibroacoustic optimization of the double-walled doubly curved composite shells having poroelastic lining in its core in a diffuse field is performed based on Non-dominated sorting Genetic Algorithm-II. To present an analytical model on the basis of multi-objective optimization, the summation of sound transmission loss and transverse displacement along with weight of the structure are considered as two cost functions, which should be optimized in a diffuse field. In fact, the significant achievement of this work is to design an optimization algorithm to improve vibroacoustic fitness and weight of the sandwich doubly curved shells. In the first part of the paper, a general formulation is prepared to analyze the dynamic of the poroelastic composite sandwich structures. Likewise, some validation configurations are presented to confirm the accuracy of the current formulation. Consequently, an optimization algorithm is provided on the basis of considering some appropriate design variables including material and porous types as well as stacking sequences. In this regard, a batch of 19 benchmarks of porous core is investigated. Furthermore, a configuration of optimized points in the Pareto front is plotted in which the simultaneous effects of optimizing the weight and vibroacoustic fitness can be observed. As a result, a new approach is made through optimization of the transverse displacement of the structure as a function of various incidence and azimuth angles in three dimensional configurations with respect to different frequencies.

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

“…However, insulators, metamaterials and poroelastic materials have been introduced in the cores of composite cylindrical or curved shells to raise their ring frequencies and further improve their STL characteristics. Talebitooti et al [80] introduced poroelastic material between doubly curved sandwich composite thin-walled panels. Different design variables such as material type and stacking sequence on their STL were investigated.…”

Damage Propagation Prediction of Adhesion Failure in Composite T-joint Structure and Improvement using PZT Patch

“…Therefore, it is very much important to identify the exact failure location and provide resistance to the propagation of failure. Laminated composite structures gained a large amount of attention among researchers because of their wide range of applications in vital research fields [1][2][3][4][5][6][7][8][9][10][11]. The mechanical and electric properties of these laminated composite structures can be further enhanced by attaching smart piezoelectric layers and combinedly they form a smart laminated composite structure.…”

Acoustic performance prediction of a multilayered finite cylinder equipped with porous foam media

“…They also inspected the effect of a porous material on the sound insulation property of the infinite and finite doubly curved shells (Talebitooti and Zarastvand, 2018b; Talebitooti et al, 2018e). In addition, in other works (Talebitooti et al, 2017; 2019), an optimization method based on the genetic algorithm (GA) was used to optimize the STL of the poroelastic structures. Ghassabi et al (2019a) achieved the acoustic response of a shell structure considering the three-dimensional (3D) theory.…”