Comparative study on vibro-acoustic properties of sandwich shells containing functionally-graded porous materials in a thermal environment  

作　　者：Xinbiao XIAO Xinte WANG Jian HAN Yuanpeng HE 

机构地区：[1]State Key Laboratory of Rail Transit Vehicle System,Southwest Jiaotong University,Chengdu 611756,China [2]School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 611756,China

出　　处：《Applied Mathematics and Mechanics(English Edition)》2025年第5期947-964,共18页应用数学和力学(英文版)

基　　金：Project supported by the National Natural Science Foundation of China (No. U1934203)。

摘　　要：The dynamics of functionally-graded(FG) sandwich shells with varied pore distributions in thermal environments is investigated,focusing on their free vibration behaviors and sound transmission loss(STL) characteristics.The effective material parameters are calculated by integrating the graded distribution through three distinct pore distribution laws.The dynamic governing equations are derived by means of the first-order shear deformation theory,guided by Hamilton's principle.The solutions for the natural frequency and acoustic transmission loss factor are obtained from the shell's free vibration general solution and the acoustic displacement function,respectively.A detailed numerical analysis is conducted to assess the impacts of the structural and geometric parameters,as well as the ambient temperature,on the vibro-acoustic properties.The results indicate that vibro-acoustic coupling is most significant in shells with a symmetric non-uniform pore distribution,and the resonance frequency shifts towards lower frequencies as the power-law index increases.These findings offer valuable insights for enhancing the design of materials aimed at vibration damping and acoustic management.

关 键 词：functionally-graded(FG)porous material cylindrical shell thermal environment sound transmission loss(STL) vibro-acoustic coupling 

分 类 号：O327[理学—一般力学与力学基础]