Mathematical modelling of sound transmission loss (STL) in metallic and graphite based coatings

ABSTRACT

This study aimed to investigate the relationship between the sound transmission loss (STL) properties and surface morphologies of metallic-based and graphite-based coatings. Aluminium (22 µm average particle size (APS) and 12 µm APS), copper (12 µm APS), silver (14 µm APS) as conductive metal pigments and graphite (18 µm APS) as a semi-conductive pigment were used to create coatings and STL properties were measured with an in-house designed sound wave modulation device. Laser beams with different carrier wavelengths were used in the experiment, for which the wavelength with the highest R² and number of significant variables was used to create a mathematical model to help in measuring the sound transmission loss properties. Surface tension energy, conductivity, permeability, reflectivity, concentration and the type of pigment were found to be significant in determining the STL properties.

KEYWORDS:

• Metallic-based coating
• conductivity
• sound transmission loss (STL)
• optoelectronics
• graphite-based coating

Acknowledgements

The authors thank the BAP Coordination Unit for their support (Project ID: FEN-C-DRP-170419-0129).

Disclosure statement

No potential conflict of interest was reported by the author(s).