Modelling Tyre/Road Noise on New Low-Noise Surfaces
| Autor: | Pizzo, Alessandro Del, Leon, Gonzalo De, Teti, Luca, Bianco, Francesco, Moro, Antonino, Fredianelli, Luca, LICITRA, Gaetano |
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| Přispěvatelé: | Environmental Protection Agency of Tuscany Region, parent |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Forum Acusticum Forum Acusticum, Dec 2020, Lyon, France. pp.2507-2511, ⟨10.48465/fa.2020.0565⟩ |
| Popis: | International audience; In most urban and extra-urban environments, road traffic is one of the dominant sources of noise, therefore, mitigation actions aimed at its abatement play a key role for the reduction of noise pollution. A possible choice is to use low-noise road surfaces, which reduce noise levels at the source thus avoiding the visual and environmental impact of barriers. For this purpose, the Green Public Procurement (GPP) has drawn up guidelines for the development of low-noise surfaces, recommending a test of their acoustical performance by means of the Close Proximity Method (CPX) shortly after laying in order to check the compliance with low-noise criteria. The purpose of this work is to propose a method for modelling CPX levels on newly laid low-noise road surfaces using data available prior to the laying process, such as aggregate grading, fractal dimension, bitumen percentage and air voids, hence leading to money and time saving in the mix design phase. Three different frequency ranges were identified and modelled separately, and the resulting broadband levels were compared with the experimental ones. The low frequency region includes bands from 315 to 800 Hz, the mid-frequency region covers the bands from 1000 to 1600 Hz and the remaining bands from 2000 to 5000 Hz were grouped in the high frequency region. The model performs well on low-noise road surfaces, showing very low RMSE, although, due to the limited data available up to date, a tyre different to the Standard Reference Test Tyre (SRTT) was used. The procedure adopted for modelling remains however valid and can be easily followed when data obtained by CPX measurements compliant to the last ISO release will be available. |
| Databáze: | OpenAIRE |
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