Damping characteristics and sound transmission loss of finite composite plates with frequency dependent constrained viscoelastic interlayer

Abstract

This paper proposes a sublaminate layer-wise finite element modeling method to accurately evaluate the damping and sound insulation characteristics of composite constrained layer damping plates. It incorporates the frequency-dependent property of viscoelastic interlayer into fully coupled structure-acoustic interaction equations, and employs the generalized high-order displacement hypothesis with tailored polynomial series expansion. The method is applicable to various boundary conditions and material layer combinations. Validation is conducted using numerical and experimental data. Parametric study identifies optimal thickness and stiffness for maximizing modal loss factor. Additionally, sound insulation performance is examined in narrow frequency bands, highlighting the damping enhancement of viscoelastic interlayer.

Keywords:

• Sound transmission loss
• layer-wise
• constrained layer damping
• viscoelastic material
• sound insulation
• Multiphysics

Data availability statement

Data will be made available on request.

Author contributions

Conceptualization, Hequn Min; methodology, Hequn Min and Bo Wang; software, Bo Wang; validation, Bo Wang, and Ting Qu; investigation, Bo Wang and Hequn Min; resources, Hequn Min; writing-original draft preparation, Bo Wang and Hequn Min; writing-review and editing, Hequn Min; visualization, Bo Wang; supervision, Hequn Min; project administration, Hequn Min; funding acquisition, Hequn Min. All authors have read and agreed to the published version of the manuscript.

Disclosure statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Additional information

Funding

This work is supported by the Natural Science Foundation of China (Grant No. 51408113) and the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20140632).