Huaibing Yuan , Yisheng Zheng , Wujun Feng , Yegao Qu , Yajun Luo , Huageng Luo
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引用次数: 0
Abstract
To address the soundproof limitations of conventional shells around the ring and coincidence frequencies, this study proposes and investigates a locally resonant piezoelectric metastructure shell (meta-shell) for sound insulation. An electrical-mechanical-acoustic coupling model of the meta-shell is established using the plane-wave expansion method (PWEM). The sound transmission loss (STL) of the meta-shell is computed analytically and further validated through finite-element simulations. It is found that, under oblique incidence of sound waves, the meta-shell exhibits obvious enhancement of STL around the ring and coincidence frequencies when the piezoelectric shunting is properly tuned. The dispersion relations of elastic waves and sound waves are analyzed to elaborate the sound-insulation mechanism. Furthermore, it is demonstrated that the STL around the ring and coincidence frequencies can be improved simultaneously when the high-order resonant shunting circuits are introduced. Due to the high tunability of piezoelectric shuntings, the meta-shell could maintain superior sound-insulation performance under varying incidence angles of sound waves and Mach numbers of fluids, which inevitably lead to the shift of coincidence frequencies. It is not easy for mechanical meta-shells to adapt to such varying conditions. Overall, this research provides physical insights of sound insulation of locally resonant piezoelectric meta-shells, offering valuable guidance for designing smart acoustic skins of aircrafts.
期刊介绍:
The International Journal of Mechanical Sciences (IJMS) serves as a global platform for the publication and dissemination of original research that contributes to a deeper scientific understanding of the fundamental disciplines within mechanical, civil, and material engineering.
The primary focus of IJMS is to showcase innovative and ground-breaking work that utilizes analytical and computational modeling techniques, such as Finite Element Method (FEM), Boundary Element Method (BEM), and mesh-free methods, among others. These modeling methods are applied to diverse fields including rigid-body mechanics (e.g., dynamics, vibration, stability), structural mechanics, metal forming, advanced materials (e.g., metals, composites, cellular, smart) behavior and applications, impact mechanics, strain localization, and other nonlinear effects (e.g., large deflections, plasticity, fracture).
Additionally, IJMS covers the realms of fluid mechanics (both external and internal flows), tribology, thermodynamics, and materials processing. These subjects collectively form the core of the journal's content.
In summary, IJMS provides a prestigious platform for researchers to present their original contributions, shedding light on analytical and computational modeling methods in various areas of mechanical engineering, as well as exploring the behavior and application of advanced materials, fluid mechanics, thermodynamics, and materials processing.