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The influence of tyres on the use of the CPX method for evaluating the effectiveness of a noise mitigation action based on low-noise road surfaces
Institution:1. ARPAT-Area Vasta Costa, Via Marradi 114, 57126 Livorno, Italy;2. IPCF-CNR – UOS di Pisa, Via G. Moruzzi 1, Pisa, Italy;3. IPOOL srl, Ripa Castel Traetti 1, Pistoia, Italy;4. ARPAT-Area Vasta Costa, Settore Agenti Fisici, Via Vittorio Veneto 27, 56127 Pisa, Italy;1. Engineering and Innovation, The Open University, Milton Keynes MK7 6AA, UK;2. Sonatest Ltd, Dickens Rd, Milton Keynes MK12 5QQ, UK;3. Technische Universiteit Eindhoven, Eindhoven, Netherlands;1. Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061, USA;2. Maxxis Technology Center, Suwanee, GA 30024, USA
Abstract:The usage of low-noise road surface can be an important and effective noise mitigation action and, in many cases, it might represent the only viable solution. After the laying of a low-noise road surface, it is necessary to verify if the planned objectives have been actually obtained: the Close Proximity Method (CPX) could be a possible method to achieve this result.The current release of the ISO 11819 draft regarding CPX redirects to a future third part for all details about the reference tyre to be used, while the previous one gave indications on dimensions, kind of tread pattern and maintenance conditions. As well known, tyre dimensions and tread pattern are the main sources of variability of rolling noise. Even though many tyres available on the market comply with all ISO requirements, the choice of a brand or a model rather than another one could nevertheless influence results of measurements.In this work, results obtained in several measurement sessions, repeated using different tyres, are compared, aiming to analyse the influence of the tyre choice in assessing the acoustic performance of a low-noise road surface. Limitations and advantages of the CPX method in regards to the evaluation of the effectiveness of a noise mitigation action are reported, and new perspectives are suggested, in order to improve the relationship with the noise level reduction at the receiver.
Keywords:Close proximity method  Pavement noise classification  Tyre/road noise  Noise mitigation effectiveness
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