مصطفي سلامتي قمصري

Vibroacoustic behavior of graphene platelet reinforced composite (GPL-RC) doubly curved shell is studied to investigate the sound transmission loss (STL), Due to the importance of the structure's behavior against acoustic waves. Many materials have been used to increase the stiffness and improve the vibroacoustic behavior of sandwich structures. which in recent years, Graphene has pro‎mp‎ted many researchers to use it in sandwich structures. Governing equations are derived based on three-dimensional elasticity and state vector method is used to solve equations of motion. Also, to investigate the boundary conditions more accurately, the temperature field and its effect on the behavior of the structure has been studied. To eva‎luate the validity of the results from previous studies, two studies that have examined the STL of structures have been used. To find the effective parameters on the STL of doubly curved shell, shell thickness, incident wave angle, shell curvature radius, constituent materials, graphene weight fraction, thickness of graphene thin plates (GPLs) and width of GPL, graphene distribution pattern and temperature have been investigated. Finally, numerical results show that adding graphene to the composite matrix increased its stiffness and thus improves the behavior of the structure against the pressure of sound waves. Also, increasing the thickness of the shell has a good effect on the STL, and increasing the incident wave angle has increased the STL of the shell in low frequency region. Among the distribution patterns of graphene, X pattern has the most stiffness and as a result has better resistance to acoustic waves and STL has improved compared to other distributions. At the end, the examination of the thermal environment conditions has indicated a decrease in the strength of the shell and a decrease in its sound transmission in case of an increase in temperature. Finally, as an important conclusion, increasing the temperature has decreased the strength of the shell and STL.

افت انتقال صوت , پوسته دو انحنايي , كامپوزيت مدرج تابعي , گرافن , تئوري الاستيسيته سه‌بعدي , حرارت

Vibroacoustic , Sound transmission loss , Graphene reinforced materials , Three-dimensional elasticity theory , Temperature

Mostafa Salamati Qamsari

Dr. Roohollah Talebitooti