{"id":970,"date":"2012-07-27T09:07:55","date_gmt":"2012-07-27T09:07:55","guid":{"rendered":"https:\/\/www.akustik-forschung.de\/test\/?p=970"},"modified":"2021-03-11T22:25:28","modified_gmt":"2021-03-11T21:25:28","slug":"cpx-rollgerauschmessung","status":"publish","type":"post","link":"https:\/\/www.akustikforschung.de\/en\/leistungen\/umweltakustik\/strassenlarm\/cpx-rollgerauschmessung\/","title":{"rendered":"CPX – Measurement of tire\/road noise"},"content":{"rendered":"

\"Measurement<\/a><\/p>\n

As an alternative to the application of the statistical pass-by method (SPB measurement)<\/a>, the influence of road surfaces on traffic noise can be evaluated on the basis of the measurement of tire\/road noise (CPX measurement) according to DIN EN ISO 11819-2.<\/p>\n

The tire\/road noise that is caused by the interaction of the road surface and the vehicle tires significantly affects the overall traffic noise level.<\/p>\n

<\/p>\n

Principle of CPX method<\/h4>\n

Within the investigations the close-proximity\u00a0(CPX) method is applied. This method includes the measurement of the A-weighted sound pressure level generated by the interaction of the road surface and various reference tires over a specified road distance at two microphones (at least) in the vicinity of the reference tire. Simultaneously, the vehicle speed is recorded by a GPS\u00a0sensor.<\/p>\n

The measurement is carried out by using a special test vehicle or a towing vehicle with measuring trailer.<\/p>\n

After dividing the test road into a run-in segment, a run-out segment and segments of 20\u00a0m length, the measurements are carried out at reference speeds of typically 40 km\/h, 50\u00a0km\/h, 80\u00a0km\/h or 100\u00a0km\/h.<\/p>\n

By averaging the measured A-weighted sound pressure level of various microphones, road segments, test runs and reference tires, the so-called CPX\u00a0index is determined for various vehicle categories that allows the evaluation and thus the comparison of road surfaces.<\/p>\n

Within the investigations two internationally standardized reference tires are used for each test road and each reference speed.<\/p>\n

<\/p>\n

\"CPX<\/a>

Evaluation of tire\/road noise by apllication of close proximty method (CPX measurement) according to DIN EN ISO 11819-2<\/p><\/div>\n

\"Presentation<\/a>

GPS-referenced mapping of the results of the measurement of tire\/road noise<\/p><\/div>\n

\"CPX<\/a>

Measurement of tire\/road noise on a highway<\/p><\/div><\/p>","protected":false},"excerpt":{"rendered":"

As an alternative to the application of the statistical pass-by method (SPB measurement), the influence of road surfaces on traffic […]<\/p>\n","protected":false},"author":1,"featured_media":1918,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22],"tags":[309,311,310,424,357,264,255,316,313,47,308,284],"class_list":["post-970","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-strassenlarm","tag-close-proximity-methode","tag-cpx","tag-cpx-index","tag-cpx-messung","tag-cpx-methode","tag-fahrbahnbelag","tag-fahrbahnoberflache","tag-kartierung","tag-messanhanger","tag-messung","tag-rollgerausch","tag-verkehrslarm","has-content-parts","content-parts-5"],"yoast_head":"\nCPX-Messung, Rollger\u00e4uschmessung - Measurement of tire\/road noise<\/title>\n<meta name=\"description\" content=\"CPX-Messung, Rollger\u00e4uschmessung mit Rollger\u00e4usch-Anh\u00e4nger nach DIN EN ISO 11819-2 (Close-Proximity-Methode), Measurement of tire\/road noise.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.akustikforschung.de\/leistungen\/umweltakustik\/strassenlarm\/cpx-rollgerauschmessung\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CPX-Messung, Rollger\u00e4uschmessung - 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