Bijdragen M+P op DAGA2016

Van 14 tot 17 maart a.s. organiseert DEGA (the German Acoustical Society) samen met RWTH Aachen de 42e editie van DAGA. DAGA is een jaarlijks Duitse congres over geluid en akoestiek, dat bekend staat om haar bijdragen met een hoge wetenschappelijke kwaliteit op alle vlakken van geluid en akoestiek. M+P heeft dit jaar twee presentaties tijdens dit congres. De samenvattingen (Engelstalig) van onze bijdragen vindt u hier.

Influence of Pore Structure on Sound Absorption in Porous Road Surfaces (Bert Peeters)
Porous road surfaces are a popular noise abatement measure, especially in the Netherlands. Porous road surfaces have the ability to absorb part of the tyre/road noise emitted by the vehicles. To obtain high noise reductions, it is important to optimize and tune the sound absorption characteristics of these road surfaces to the noise emitted by the traffic.

M+P has investigated the relation between the structure of the air voids (the pores) in double layer porous asphalt surfaces by analysing the 3D computed tomography images (CT-scans) in terms of different parameters that describe the pore structure. These parameters can be used together with absorption models to find the optimal pore structure.

With the new insights gained from our research, we can help the road constructors to optimize their asphalt design, production process and application techniques to obtain better noise reductions and increase the acoustic durability.

Determination of Acoustic Properties of Noise Barriers (Fons Peeters)
The acoustic performance of noise barriers is determined by many parameters. In general minimum values for the absorption and insulation are prescribed.  These minimum requirements are then tested on a sample of the barrier by laboratory measurements (EN1793-1 and/or EN1793-2). In-situ testing of the requirements occurs rarely.

Recently major improvements in the measurement methods for determining the in-situ values of noise barriers have been implemented. Laboratory and in-situ measurements have been compared. TAdditionally, new measurement methods have been developed by the University of Twente, which are suitable to determine the acoustic properties of noise barriers in-situ, for any complex sound field.

In this study, the relation between EN1793 laboratory and in-situ measurements is quantified, based on an extended measurement program of laboratory and in-situ techniques on different noise barrier samples. The SonoCat technique developed in Twente has also been applied. The results for all three measurement methods are presented and discussed.  The goal is to enable the validation and conformity of the lab-based acoustic requirements of noise barriers with in-situ measurement methods.

 

 

Maart 2016

 
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