Abstract
• A normalised method for Tyre Cavity Noise measurements is not available. • Based on an existing CPX method, a normalisation procedure was designed. • This method was used on 24 road surfaces, together with CPX and texture measurements. • Results show that TCN is correlated to road texture levels within the 100 mm band. • TCN measurements could represent an adequate tool for road surface monitoring. In this work, a protocol to study Tyre Cavity Noise (TCN) was developed. Using this new method, TCN was measured on 24 different road pavements, together tyre noise emission measured with the Close-Proximity (CPX) method and road texture measurements. The results were used to model the relationship between TCN and road surface parameters. The analysis shows that the Standard Reference Test Tyre’s (SRTT) TCN is correlated to megatexture at low frequencies and that the correlation between TCN and outside noise emission is significant for frequencies lower than 1 kHz. The use of sensors placed inside the tyre for monitoring the acoustic performance of road pavements presents several advantages compared to the CPX method, such as a more compact design, lower cost and lower hazards both for the instrumentation and for other vehicles.
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