How much sound does a vegetated roof absorb? To answer that question an appropriate measurement method is needed. In our recently published Applied Acoustics paper by Chang Liu, Fotis Georgiou and Maarten Hornikx, the acoustic impedances of greens roofs were retrieved by fitting parameters of a surface impedance model by measurents on the roofs. It…
Reliable data on acoustical properties of materials are crucial for the design of a desired acoustic environment as well as to obtain accurate results from acoustic simulations. Although the acoustical properties of materials can be obtained via laboratory measurements, situations where in situ measurements are needed are often encountered. In our recent paper published in…
One of the functions of open-plan study environments is to study for exams. The influence of the background noise, that is different number of people talking in the background and different room acoustic conditions, on the (perceived) performance of students is investigated here. First author Ella Braat-Eggen (with a PhD from our group) is working…
In our recent open-access paper in Applied Acoustics, we publish a method to auralize a pass-by of a car in a street based on measured impulse responses. Listening tests have assisted to discover the influence of the resolution of impulse response source positions on audible differences. First author is Fotis Georgiou, he obtained his PhD from…
Paper alert! Applying the Discontinuous Galerkin time-domain methods to room acoustics is time consuming if the mesh needs local refinement for geometrical reasons. In this JASA paper, a discontinuous time stepping approach is successfully presented, implying a release of the high computational constraint for meshes with strong local refinements. A next step in wave-based room…
Find out about our latest Acta Acustica paper! We experimentally explored the use of a heel drop as an impact source to quantify the impact sound performance of lightweight wooden floors. A impact force plate was used for this purpose. At low frequencies, the measurement quality using the help drop is higher compared to an…
The Applied Acoustics journal has just accepted our journal paper "Meteorological effects on the noise reducing performance of a low parallel wall structure". A low parallel wall structure along major roads can reduce road traffic noise substantially. In this work we address the performance of this structure when meteorological effects do influence its noise reduction.…
My ten questions paper on computational urban acoustics is in press in the journal Building and Environment (it can be found here). The paper contains ten questions and answers related to the need for computational acoustics methods, the relevance of including various urban propagation effects in computational modelling, and to the preferable computational methods and…
The Elsevier journal Computer Physics Communications, has accepted the paper titled: “openPSTD: the open source pseudospectral time-domain method for acoustic propagation”, by Maarten Hornikx, Thomas Krijnen and Louis van Harten. The paper presents the implementation of our open source software openPSTD (www.openPSTD.org) for accurate computation of sound propagation in the built environment. The software will be…
The journal of the European Acoustics Association (EAA), Acta Acustica United with Acoustics, has just accepted the paper titled: "Numerical investigation of the effect of crosswind on sound propagation outdoors", by Maarten Hornikx and Timothy van Renterghem. In the paper, we show that the effect of wind on noise propagation from a line source (like…
Building Acoustics TU/e 