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  A test based upon Maximum Length Sequence (MLS) methods has been developed for the in-situ measurement of the sound absorption of porous road surfaces. This test is described in a draft ISO standard and allows a relatively large area of road surface to be examined over a wide frequency range without the need to extract core samples. In addition, because the signal to noise ratio is very high, valid roadside measurements in the presence of traffic can be realised. Currently these tests are carried out using static MLS equipment; however it would be advantageous to have a mobile method. This is because the requirement to close a lane to traffic in order to gather large numbers of samples largely precludes measurements being carried out on many busy roads. Therefore, TRL has examined the feasibility of conducting such measurements from a mobile platform. This paper describes initial trials carried out on a number of test surfaces using a specially designed trailer suitable for both static and moving measurements. Dynamic measurements were taken on a range of road surfaces including both absorptive and reflective surfaces at speeds up to 20 km/h.
content link: http://www.transportresearchfoundation.co.uk/PDF/Environment/Trials%20of%20a%20mobile%20MLS%20technique%20for%20characterising%20road%20surface%20absorption.pdf
content language: English
English summary: no
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This content is related to:
project type
National projects 
area of interest
 pavement engineering
 noise & vibration
user type
road authorities/owners 
research labs 
material producers 
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