Searched for: subject%3A%22Sound%255C%2Bpropagation%22
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van der Eerden, F. (author), van den Berg, F. (author), van Heijningen, A. (author)
Noise contours around military training areas are calculated by using: a) the measured source strength for the impulsive sources and b) the calculated sound propagation using a representative set of meteorological situations. For high-energy impulsive sounds the source strength is measured at distances beyond 100 meters, where peak levels are...
conference paper 2022
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van der Eerden, F.J.M. (author), van den Berg, F.H.A. (author), Wessels, P.W. (author), Kruyen, A.H.J. (author)
The use of combining sound measurements and sound propagation modelling is increasing. In this paper the acoustic situation on and around a shooting range is considered. A monitoring system that automatically detects and localizes impulsive sound events is presented. The locations of these events are obtained by combining detections from...
conference paper 2018
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Binnerts, B. (author), Blom, K.C.H. (author), Giodini, S. (author)
Acoustic underwater communication is an enabler for the use of autonomous underwater vehicles (AUVs). AUVs can operate in acoustically challenging environments, e.g., near offshore platforms and in harbours. To realize robust underwater communication in such environments, the propagation conditions need to be properly understood. In this paper,...
conference paper 2017
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de Jong, C.A.F. (author), Ainslie, M.A. (author), Heinis, F. (author), Janmaat, J. (author)
The underwater sound produced during construction of the Port of Rotterdam harbor extension (Maasvlakte 2) was measured, with emphasis on the contribution of the trailing suction hopper dredgers during their various activities: dredging, transport, and discharge of sediment. Measured source levels of the dredgers, estimated source levels of...
bookPart 2016
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van der Eerden, F. (author), Wessels, P. (author), Segers, A. (author), Basten, T. (author), de Coensel, B. (author), Botteldooren, D. (author), Van Renterghem, T. (author), Dekoninck, L. (author), Spruytte, V. (author), Makovec, A. (author)
The distance between noise sources at a large industrial area and a local community can be in the order of several kilometers. At such distances it may not be clear which sources are the main contributors to possible noise complaints. A long-term monitoring project is described that measures the sound sources in the industrial area and the sound...
conference paper 2016
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Wittekind, D. (author), Tougaard, J. (author), Stilz, P. (author), Dähne, M. (author), Clark, C.W. (author), Lucke, K. (author), von Benda-Beckmann, A.M. (author), Ainslie, M.A. (author), Siebert, U. (author)
We estimated the long-range effects of air gun array noise on marine mammal communication ranges in the Southern Ocean. Air gun impulses are subject to significant distortion during propagation, potentially resulting in a quasi- continuous sound. Propagation modeling to estimate the received waveform was conducted. A leaky integrator was used as...
bookPart 2016
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Sertlek, H.O. (author), Ainslie, M.A. (author)
Accurate and fast estimation of propagation loss (PL) is needed for simulations of sonar or acoustic communication performance, and for environmental risk assessment. Accurate calculation of PL in range dependent and lossy waveguides can require computationally expensive wave theory techniques . In this work, a new propagation model is...
conference paper 2014
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Schippers, P. (author), Colin, M.E.G.D. (author), Beerens, S.P. (author)
This paper is dedicated to the work of Pieter Schippers and gives an overview of his achievement in sonar performance modelling over his career. This publication is the last of a long list, many of which published at UDT [1-5]. A historical review is presented of the sonar performance modeling work at TNO in Underwater Acoustics since the mid...
conference paper 2014
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Binnerts, B. (author), von Benda-Beckmann, A.M. (author), van Beek, P.J.G. (author)
In the oil & gas industry there is a trend towards more subsea activities. To improve gas recovery from existing and new fields at greater depths, the produced gas will be compressed, processed and transported via subsea templates and underwater networks (pipelines, flexible risers, etc.). Besides the huge consequences for the subsea...
conference paper 2014
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van der Eerden, F. (author), Graafland, F. (author), Wessels, P. (author), Segers, A. (author), Salomons, E. (author)
Noise control for an urban district starts by understanding the actual noise situation. A correct understanding is needed to take appropriate and cost efficient measures. For a noise burdened urban district, surrounded by road and rail traffic, the traffic noise as well as the annoyance has been measured. The size of the district is...
conference paper 2014
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Wittekind, D. (author), Tougaard, J. (author), Stilz, P. (author), Dähne, M. (author), Lucke, K. (author), Clark, C.W. (author), von Benda-Beckmann, A.M. (author), Ainslie, M.A. (author), Siebert, U. (author)
Functional marine mammal acoustic communication evolved under natural ambient noise levels, which makes communication vulnerable to intense, anthropogenic noise sources. We consider the potential long-range reduction effects of airgun noise on marine mammal communication range. During the propagation process, airgun impulses are reflected...
conference paper 2013
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Danilouchkine, M.G. (author), van Neer, P.L.M.J. (author), Verweij, M.D. (author), Matte, G.M. (author), Vletter, W.B. (author), van der Steen, A.F.W. (author), de Jong, N. (author)
Second harmonic imaging is currently accepted as the standard in commercial echographic systems. A new imaging technique, coined as superharmonic imaging (SHI), combines the third till the fifth harmonics, arising during nonlinear sound propagation. It could further enhance the resolution and quality of echographic images. To meet the bandwidth...
article 2013
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van der Eerden, F.J.M. (author), van den Berg, F.H.A. (author)
Environmental research is ongoing to predict and to mitigate the noise impact of heavy weapons or explosives. In the densely populated area of the Netherlands this is of particular interest for the Ministry of Defence as the shock waves can propagate over large distances. In this research program the mitigation of shock waves by means of a sound...
article 2012
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Bosschaart, C. (author), Eisses, A.R. (author), van der Eerden, F.J.M. (author)
Amsterdam Airport Schiphol has organized a competition to design a noise mitigating measure along the 'Polderbaan' runway. Its main goal is to reduce the low frequency (LF) ground noise from starting aircraft. The winning concept is a flexible parabolic shaped noise barrier positioned relatively close to the runway. There is a large distance...
conference paper 2010
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Ainslie, M.A. (author), TNO Defensie en Veiligheid (author)
Sonar performance modelling (SPM) is concerned with the prediction of quantitative measures of sonar performance, such as probability of detection. It is a multidisciplinary subject, requiring knowledge and expertise in the disparate fields of underwater acoustics, acoustical oceanography, sonar signal processing and statistical detection theory...
book 2010
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van der Eerden, F.J.M. (author), van der Berg, F. (author)
In the densely populated area of the Netherlands, the objective of the Netherlands Ministry of Defence is to find an optimal balance between military training and the impact on the surrounding civilian community. A special case concerns large weapons, such as artillery or demolitions, which create high-energy blast waves. These waves have a low...
conference paper 2010
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Wunderli, J.M. (author), Salomons, E.M. (author), TNO Bouw en Ondergrond (author)
A model is presented to predict the reflection of sound at forest edges. A single tree is modelled as a vertical cylinder. For the reflection at a cylinder an analytical solution is given based on the theory of scattering of spherical waves. The entire forest is represented by a line of cylinders placed along the forest edge. The spacing between...
article 2009
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Salomons, E.M. (author), van Maercke, D. (author), Randrianoelina, A. (author), TNO Bouw en Ondergrond (author)
The Harmonoise sound propagation model ('the Harmonoise engineering model') was developed in the European project Harmonoise (2001-2004) for road and rail traffic noise. In 2008, CSTB Grenoble and TNO Delft have prepared a detailed description of the various steps involved in a calculation with the Harmonoise model. In the course of this joint...
conference paper 2009
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te Raa, L.A. (author), Lam, F.P.A. (author), Schouten, M.W. (author), Janmaat, J. (author), TNO Defensie en Veiligheid (author)
Spatial and temporal variations in sound speed can have substantial effects on sound propagation and hence sonar performance. Operational oceanographic models can provide forecasts of oceanographic variables as temperature, salinity and sound speed up to several days ahead. These four-dimensional forecasts can be used as input for a sonar...
conference paper 2009
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Salomons, E.M. (author), Polinder, H. (author), Lohman, W. (author), Zhou, H. (author), Borst, H. (author), TNO Bouw en Ondergrond (author)
A new engineering model for sound propagation in cities is presented. The model is based on numerical and experimental studies of sound propagation between street canyons. Multiple reflections in the source canyon and the receiver canyon are taken into account in an efficient way, while weak reflections by distant buildings involving multiple...
conference paper 2009
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