Abstract
Noise pollution has become an important issue. One of the main sources of noise in residential areas is represented by transportation and by the interaction between tyre and road surface. Several studies illustrate that traffic noise is affected by road properties such as acoustic absorption, surface texture, and mechanical impedance. This latter, function of the angular frequency ω, is defined as the ratio of a force applied on a structure to the induced velocity. Despite a growing interest in mechanical impedance there is still lack of results about its impact on traffic noise. Consequently, the aim of the study presented in this paper is to investigate the relationship between road acoustic response and mechanical impedance. Tests (EN 29052-part 1, ISO 7626-5) have been performed on different types of samples and materials, using an impact hammer and an accelerometer. Investigations are still in progress. First results seem to demonstrate that both frequencies and other noise-related characteristics could be affected by changes of mechanical impedance, boundary conditions, tests, and type of material.
Highlights
According to the World Health Organization (WHO), the health impacts of environmental noise are a growing concern among both the general public and policy-makers in Europe (WHO Europe, 2011).With conservative assumptions applied to the calculation methods, at least one million healthy life years are lost every year from traffic-related noise in the western part of Europe
The results show that the indicator MI’ was about 48 dB for nine Hot Mix Asphalt (HMA) slabs, about 37 dB for a poroelastic surface, about 58 dB for a cement concrete surface, and about 53 dB for the six trial sections
The aim of this study and the related laboratory tests was to investigate the correlation between mechanical properties and acoustic response of road pavements, through an impact hammer test method
Summary
According to the World Health Organization (WHO), the health impacts of environmental noise are a growing concern among both the general public and policy-makers in Europe (WHO Europe, 2011). With conservative assumptions applied to the calculation methods, at least one million healthy life years are lost every year from traffic-related noise in the western part of Europe For this reason, one of the most important road requirement is to include a low noise contribution (Praticò, 2011). The vibrations generated from rolling tyre are dependent on tyre tread design, macrotexture in the road surface, and friction between tyre and road surface Another parameter that has gained importance over time and that can influence the level of vibration is represented by the mechanical impedance (Keulen & Duškov, 2005). Many types of input excitations and response outputs can be used to calculate an experimental FRF: 1) For mechanical systems, inputs in force (Newtons, N) and outputs in Acceleration (g's), Velocity (m/s) or Displacement (meter, m). Among the standards that refer to FRFs the following can be listed: USAS S2.6 (1963), EN 29052-1 (1992), ISO 7626-5 (2019), ASTM C125 (2002), EN 14146 (2004) (Bede & Kožar, 2016)
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