Print Email Facebook Twitter Comparison of CPX systems with Round Robin Test Title Comparison of CPX systems with Round Robin Test Author Reinink, F. van Blokland, G. de Roo, F. Derksen, G.B. Publication year 2011 Abstract The CPX method (ISO/CD 11819-2) is regularly used for assessing the acoustic quality of road surface within the frame work of checking with compliance to contract requirements nd conformity-of-production. The reproducibility of the test procedure is investigated ith a Round Robin test in which 7 operators of CPX systems, coming from Belgium, Denmark, Germany and Netherlands, participated. All systems were constructed as two heeled trailers, both with and without enclosure. All systems performed tests with three different tyre sets. One of them was a reference set that was used by all systems. Tests were done on a series of five different road surfaces, comprising of dense, semi open and porous types. The analysis of the variances observed in the test results (ANOVA) learned that the repeatability of the test procedure (one standard deviation) is about 0.4 dB. The reproducibility of the system without the effect of differences in tyre properties is about 0.6 dB. When the variation in tyre properties is included a standard deviation of 0.8 dB resulted. These test results corroborate the estimated uncertainty given by the ISO/CD 11819-2. Subject Physics & ElectronicsAS - Acoustics & Sonar ; II - Intelligent ImagingTS - Technical SciencesHigh Tech Systems & MaterialsAcoustics and AudiologyIndustrial InnovationTraffic noisePavementRoad surfaceRound robin tests To reference this document use: http://resolver.tudelft.nl/uuid:4ec7643e-14da-41a5-8a1e-b11b6c6ce078 TNO identifier 465883 Publisher The Institute of Noise Control Engineering of the USA, Washington, D.C. Source 41th International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012, 19-22 August 2012, New York, NY, USA Document type conference paper Files To receive the publication files, please send an e-mail request to TNO Library.