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Purpose <p>Engineering structures often interact with surrounding fluids, especially in aerospace applications where structures like cylindrical shells carry fuel and are exposed to extreme aerodynamic conditions such as supersonic flow. These interactions, along with thermal and moisture effects, significantly affect the dynamic behavior of the structure. However, the combined influence of thermo-fluidic parameters on the large-amplitude vibration of fluid-conveying cylindrical shells, particularly those made of functionally graded carbon nanotube-reinforced composites (FG-CNTRCs), has not been thoroughly investigated. This study addresses this gap by analyzing the nonlinear vibrational behavior of such a shell exposed to a hygrothermal environment and supersonic airflow.</p> Methods <p>To this end, the thermo-mechanical equations of the system are extracted using the von Karman strain–displacement relations and first-order shear deformation theory (FSDT). First-order piston theory (FPT) is utilized to model supersonic flow. Additionally, since the shell contains moving fluid, linear potential flow theory (LPFT) is employed to describe the fluid–solid interaction (FSI) model. Subsequently, to solve the linear and nonlinear dynamic equations of the system, generalized differential quadrature (GDQ) method, the Galerkin method, and multiple time-scales (MTS) method are employed.</p> Results and Conclusion <p>The study reveals how temperature, moisture, external flow pressure, internal fluid velocity and density, shell geometry, and CNT distribution significantly influence the nonlinear vibrational characteristics, particularly the hardening behavior and natural frequency shifts. These findings provide valuable insights for the robust design of fluid-conveying aerospace components under extreme environmental conditions.</p>

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The Effect of Supersonic Flow and Hygrothermal Environment on the Nonlinear Vibrations of Carbon Nanotubes-Reinforced Composite Cylindrical Shells Containing Fluid

  • 期刊论文

  • 发表日期：

    2025年6月7日

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  • Navid Faghanizadeh,
  • Farhad Hosseinnejad,
  • Seyyed Masoud Seyyedi,
  • Kouros Nekoufar

摘要

Purpose

Engineering structures often interact with surrounding fluids, especially in aerospace applications where structures like cylindrical shells carry fuel and are exposed to extreme aerodynamic conditions such as supersonic flow. These interactions, along with thermal and moisture effects, significantly affect the dynamic behavior of the structure. However, the combined influence of thermo-fluidic parameters on the large-amplitude vibration of fluid-conveying cylindrical shells, particularly those made of functionally graded carbon nanotube-reinforced composites (FG-CNTRCs), has not been thoroughly investigated. This study addresses this gap by analyzing the nonlinear vibrational behavior of such a shell exposed to a hygrothermal environment and supersonic airflow.

Methods

To this end, the thermo-mechanical equations of the system are extracted using the von Karman strain–displacement relations and first-order shear deformation theory (FSDT). First-order piston theory (FPT) is utilized to model supersonic flow. Additionally, since the shell contains moving fluid, linear potential flow theory (LPFT) is employed to describe the fluid–solid interaction (FSI) model. Subsequently, to solve the linear and nonlinear dynamic equations of the system, generalized differential quadrature (GDQ) method, the Galerkin method, and multiple time-scales (MTS) method are employed.

Results and Conclusion

The study reveals how temperature, moisture, external flow pressure, internal fluid velocity and density, shell geometry, and CNT distribution significantly influence the nonlinear vibrational characteristics, particularly the hardening behavior and natural frequency shifts. These findings provide valuable insights for the robust design of fluid-conveying aerospace components under extreme environmental conditions.