Additional guidelines for the execution of tyre-road noise measurements with a CPX (Close Proximity) measurement trailer

The Dutch practice of assessment of the noise reducing properties of pavements according to the CPX (Close Proximity) Method has revealed that relatively large differences may occur between test results produced by different CPX operators. Due to these differences road authorities are facing questions and uncertainties about the acoustical...

CPX trailer comparison round robin test data analysis

One of the methods to determine the influence of the road surfaces characteristics on the emission of noise by road traffic is the so-called Close Proximity (CPX) method, which measures the noise emission of the tyre-road contact in the near field of a sound radiating tyre. These measurements are executed with CPX measurement trailers....

Aanvullende richtlijnen voor de uitvoering van band-wegdekgeluidmetingen met een CPX (Close Proximity)-meetaanhanger

In de Nederlandse praktijk van het meten van de geluidsreductie van wegdekken met behulp van de CPX-methode [1] is gebleken dat er tussen de resultaten van verschillende uitvoerders van deze methode relatief grote verschillen bestaan die voor opdrachtgevers leiden tot vragen en onduidelijkheden over de akoestische kwaliteit van de gemeten...