Audible Pollution Multilayer Coating Reduction

Within this paper, the impact of a superhydrophobic coating on the audible noise produced by an overhead line conductor is examined. Noise levels from a conductor coated with a superhydrophobic coating were compared to those from a bare conductor in a semi-anechoic chamber. Audible noise (AN) from transmission lines is gradually becoming one of the key concerns for overhead line (OHL) design. This article investigates AN emission under rainy and foggy conditions when water droplets form on the surface of the OHL conductors, which maximizes the corona discharges. This study can provide theoretical guidance for the design and optimization of acoustic coatings with multi-layer solid inclusions. Why do acoustic coatings need a low-frequency broadband absorption? As a key component, acoustic coatings must achieve stable absorption of underwater sound waves across the entire depth range . However, traditional sound-absorbing structures face challenges in achieving low-frequency broadband absorption at small scales due to limitations in material size and resonance mechanisms. What is a multilayer acoustic coating made of? The material composition of this multilayer acoustic coating is as follows: layer 1 is made of IIR (butyl rubber), layers 2 and 4 use NBR (nitrile rubber), and layer 5 is composed of SBR (styrenebutadiene rubber). Notably, the middle layer 3 is made of Ni 50 Ti 50 alloy. Do acoustic coatings improve sound absorption? Acoustic coatings play a vital role in enhancing the acoustic stealth of underwater structures across the full depth range and, especially, in the low-frequency band. However, existing small-scale acoustic coatings struggle to achieve low-frequency broadband sound absorption, which limits further performance improvements. Does rubber coating reduce sound speed? The theoretical results are consistent with the simulation results. The rubber coating can significantly reduce the effective sound speed of the channel. It generates slow sound propagation and internal friction to meet impedance-matching requirements. The main objective of the research is to examine the role of superhydrophobic surfaces in reducing audible noise. NeverWet, a commercial coating, was applied to overhead line conductors to achieve a repeatable superhydrophobic surface.