document

Stolt migration based iterative trace reconstruction

van Neer, P.L.M.J. (author), Vos, H.J. (author), Volker, A.F.W. (author)

Proper spatial sampling is critical for high quality imaging. If the sampling criterion is not met, grating lobe artifacts appear in the image. In non-destructive testing applications efficiency is being increased by the steady enlargement of the field of view, resulting in more elements and thus a higher transducer complexity and cost. In the...

conference paper 2016

document

Mapping underwater sound in the Dutch part of the North Sea

Sertlek, H.O. (author), Aarts, G. (author), Brasseur, S. (author), Slabbekoorn, H. (author), ten Cate, C. (author), von Benda-Beckmann, A.M. (author), Ainslie, M.A. (author)

The European Union requires member states to achieve or maintain good environmental status for their marine territorial waters and explicitly mentions potentially adverse effects of underwater sound. In this study, we focused on producing maps of underwater sound from various natural and anthropogenic origins in the Dutch North Sea. The source...

bookPart 2016

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WODA technical guidance on underwater sound from dredging

Thomsen, F. (author), Borsani, F. (author), Clarke, D. (author), de Jong, C. (author), de Wit, P. (author), Goethals, F. (author), Holtkamp, M. (author), Martin, E.S. (author), Spadaro, P. (author), van Raalte, G. (author), Victor, G.Y.V. (author), Jensen, A. (author)

The World Organization of Dredging Associations (WODA) has identified underwater sound as an environmental issue that needs further consideration. A WODA Expert Group on Underwater Sound (WEGUS) prepared a guidance paper in 2013 on dredging sound, including a summary of potential impacts on aquatic biota and advice on underwater sound monitoring...

conference paper 2016

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Fusion of multiple microphone array data for localizing sound sources in an industrial area

Botteldooren, D. (author), van Renterghem, T. (author), de Coensel, B. (author), Dekoninck, L. (author), Spruytte, V. (author), Makovec, A. (author), van der Eerden, F. (author), Wessels, P. (author), Basten, T. (author)

conference paper 2016

document

The ODELIA Study on Noise Limits for Outdoor Machinery

Dittrich, M.G. (author), Carletti, E. (author), Spellerberg, G. (author)

In the ODELIA study for the European Commission an assessment of the outdoor equipment noise directive 2000/14/EC and its amendment 2005/88/EC has been performed. The directive requires noise marking for 57 types of equipment used outdoors, and sets noise limits for 22 of these. Since the limits have remained unchanged for many years, there is...

conference paper 2016

document

Blind equalization of underwater acoustic channels using implicit higher-order statistics

Blom, K.C.H. (author), Dol, H.S. (author), Kokkeler, A.B.J. (author), Smit, G.J.M. (author)

conference paper 2016

document

Offshore dredger sounds: Source levels, sound maps, and risk assessment

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

document

Active control of time-varying broadband noise using online system identification with parallel fast-array recursive least squares filters

Berkhoff, A.P. (author), Meijer, H.J. (author), van Ophem, S. (author)

conference paper 2016

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1D profiling using highly dispersive guided waves

Volker, A.W.F. (author), van Zon, A.T. (author), Hsu, Z.C. (author), van den Boogert, L. (author)

Corrosion is one of the industries major issues regarding the integrity of assets. Currently inspections are conducted at regular intervals to ensure a sufficient integrity level of these assets. Cost reduction while maintaining a high level of reliability and safety of installations is a major challenge. There are many situations where the...

conference paper 2016

document

Sonar equations for planetary exploration

Ainslie, M.A. (author), Leighton, T.G. (author)

The set of formulations commonly known as “the sonar equations” have for many decades been used to quantify the performance of sonar systems in terms of their ability to detect and ocalize objects submerged in seawater. The efficacy of the sonar equations, with individualterms evaluated in decibels, is well established in Earth’s oceans. The...

article 2016

document

International harmonization of approaches to define underwater noise exposure criteria and needs of the international regulatory community

Lucke, K. (author), Scowcroft, G. (author), Winter, H.V. (author), Knowlton, C. (author), Lam, F.P.A. (author), Hawkins, A. (author), Popper, A.N. (author)

conference paper 2016

document

A numerically stable, finite memory, fast array recursive least squares filter for broadband active noise control

van Ophem, S. (author), Berkhoff, A.P. (author)

Summary For broadband active noise control applications with a rapidly changing primary path, it is desirable to find algorithms with a rapid convergence, a fast tracking performance, and a low computational cost. Recently, a promising algorithm has been presented, called the fast-array Kalman filter, which uses rotation matrices to calculate...

article 2016

document

Harbour porpoise movement strategy affects cumulative number of animals acoustically exposed to underwater explosions

Aarts, G. (author), von Benda-Beckmann, A.M. (author), Lucke, K. (author), Özkan Sertlek, H. (author), van Bemmelen, R. (author), Geelhoed, S.C.V. (author), Brasseur, S. (author), Scheidat, M. (author), Lam, F.P.A. (author), Slabbekoorn, H. (author), Kirkwood, R. (author)

Anthropogenic sound in the marine environment can have negative consequences for marine fauna. Since most sound sources are intermittent or continuous, estimating how many individuals are exposed over time remains challenging, as this depends on the animals’ mobility. Here we explored how animal movement influences how many, and how often,...

article 2016

document

Designing reconfigurable systems: Methodology and guidelines

Papp, Z. (author), del Toro Matamoros, R. (author), van Leeuwen, C. (author), de Oliveira Filho, J. (author), Pruteanu, A. (author), Šůcha, P. (author)

One of the major challenges when designing software for complex systems relates to a lack of a specific and comprehensive set of rules and methodologies. Even more so, adaptation to field conditions is difficult to model and implement on systems composed of a larger number of devices/components, such as distributed systems or systems of systems....

bookPart 2016

document

Numerical modeling of electrical-mechanical-acoustical behavior of a lumped acoustic source driven by a piezoelectric stack actuator

Tajdari, F. (author), Berkhoff, A.P. (author), de Boer, A. (author)

The present work describes the electrical, mechanical and acoustical behavior of a thin honey-comb structure as an acoustic source. The acoustic source has to operate in the low frequency, quasi-static regime and is driven by a piezoelectric stack actuator. In addition, a two-way energy flow between the actuator and a connected amplifier is...

conference paper 2016

document

Disturbance-specific social responses in long-finned pilot whales, Globicephala melas

Visser, F. (author), Curé, C. (author), Kvadsheim, P.H. (author), Lam, F.P.A. (author), Tyack, P.L. (author), Miller, P.J.O. (author)

Social interactions among animals can influence their response to disturbance. We investigated responses of long-finned pilot whales to killer whale sound playbacks and two anthropogenic sources of disturbance: Tagging effort and naval sonar exposure. The acoustic scene and diving behaviour of tagged individuals were recorded along with the...

article 2016

document

Time varying sound propagation for a large industrial area

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

document

The effect of sound speed profile on shallow water shipping sound maps

Sertlek, H.Ö. (author), Binnerts, B. (author), Ainslie, M.A. (author)

Sound mapping over large areas can be computationally expensive because of the large number of sources and large source-receiver separations involved. In order to facilitate computation, a simplifying assumption sometimes made is to neglect the sound speed gradient in shallow water. The accuracy of this assumption is investigated for ship...

article 2016

document

Development of a model to assess masking potential for marine mammals by the use of air guns in Antarctic waters

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

document

Underwater noise measurements in the North Sea in and near the Princess Amalia Wind Farm in operation

Jansen, E. (author), De Jong, C. (author)

conference paper 2016