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Amiri-Simkooei, A. (author), Snellen, M. (author), Simons, D.G. (author)
conference paper 2008
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Simons, D.G. (author), Snellen, M. (author)
conference paper 2008
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Snellen, M. (author), Merino Martinez, R. (author), Simons, D.G. (author)
Noise assessment around airports is hampered due to the observed large variability in noise levels for fly-overs of the same aircraft type, which is not considered by the current models. This paper assumes that the noise variability is due to variations in the aircraft emitted noise, neglecting the effect of the variable atmosphere, as previous...
conference paper 2015
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Siemes, K. (author), Snellen, M. (author), Simons, D.G. (author), Hermand, J.P. (author)
Shallow water naval operations require detailed knowledge of the environmental properties. In addition to parameters such as water depth, knowledge about the sediment properties is of high importance for a wide range of operations. In this context, the MREA BP'07 experiment was carried out in the Mediterranean Sea in 2007. Measurements employed...
conference paper 2009
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Snellen, M. (author), Simons, D.G. (author), Riethmueller, R. (author)
conference paper 2008
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Snellen, M. (author), Siemes, K. (author), Simons, D.G. (author)
Nowadays extensive use is made of multibeam echosounders (MBES) for mapping the bathymetry of sea- and river-floors. The MBES is capable of covering large areas in limited time by emitting an acoustic pulse along a wide swathe perpendicular to the sailing direction. The angle and the corresponding two-way travel-time of the received signals are...
conference paper 2009
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Arntzen, M. (author), Van Veen, T.A. (author), Visser, H.G. (author), Simons, D.G. (author)
Aircraft noise annoyance predictions based on traditional tools lack fidelity when modelling a single aircraft flyover. For evaluating annoyance of new procedures, different aircraft types or changing atmospheric conditions, a new modelling approach is necessary. A research effort has been initiated to develop a toolchain that links each of the...
conference paper 2011
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De Plaa, J. (author), Snellen, M. (author), Simons, D.G. (author)
conference paper 2008
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Siemes, K. (author), Snellen, M. (author), Simons, D.G. (author), Hermand, J.P. (author), Meyer, M. (author), Le Gac, J.C. (author)
conference paper 2008
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Amiri-Simkooei, A. (author), Snellen, M. (author), Simons, D.G. (author), Buckingham, M. (author)
conference paper 2008
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Orru, C. (author), Eleftherakis, D. (author), Blom, A. (author), Snellen, M. (author), Uijttewaal, W.S.J. (author), Simons, D.G. (author)
Grain size changes in a river dominated by mixed sediment are the outcome of sedimentary grain sizeselective processes. Progress in the measurement techniques that define the spatial and temporal variation in grain size is necessary to provide new insights in this field. Techniques as image analysis and acoustic methods have emerged in the last...
conference paper 2013
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Amiri-Simkooei, A.R. (author), Snellen, M. (author), Simons, D.G. (author)
In a recent work described in Ref. [1], an angle-independent methodology was developed to use the multi-beam echo sounder backscatter (MBES) data for the seabed sediment classification. The method employs the backscatter data at a certain angle to obtain the number of sediment classes and to discriminate between them by applying the Bayes...
conference paper 2009
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Siemes, K. (author), Snellen, M. (author), Simons, D.G. (author), Hermand, J.P. (author)
Shallow water naval operations require detailed knowledge of the environmental characteristics. In this context, the BP’07 experiment was carried out in the Mediterranean Sea, south-east of Elba Island, in 2007. Measurements that were taken during this experiment employ a large set of sensors, thereby providing all information required to fully...
conference paper 2009
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Arntzen, M. (author), Bertsch, E.L. (author), Simons, D.G. (author)
A joint initiative of NLR, DLR, and TU Delft has been initiated to streamline the process of generating audible impressions of novel aircraft configurations. The integrated approach adds to the value of the individual tools and allows predicting the sound of future aircraft before they actually fly. Hence, an existing process for the aircraft...
conference paper 2015
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Allouche, N. (author), Simons, D.G. (author), Rietveld, L.C. (author)
A novel instrument is developed to acoustically image sand filters used for water treatment and monitor their performance. The instrument consists of an omnidirectional transmitter that generates a chirp with a frequency range between 10 and 110 kHz, and an array of hydrophones. The instrument was extensively tested in a lab before being...
conference paper 2012
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El Allouche, N.E. (author), Drijkoningen, G.G. (author), Versteeg, W. (author), Simons, D.G. (author)
conference paper 2008
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Kinneging, N. (author), Snellen, M. (author), Eleftherakis, D. (author), Simons, D.G. (author), Mosselman, E. (author), Siben, A. (author)
The Netherlands form the delta for some of the major river systems of Europe, comprising the Rhine, the Meuse, the Scheldt and the Eems. These rivers are valuable parts of national and international ecological networks and are of high economic importance. A minimum depth should be guaranteed to keep the rivers navigable. This depth depends not...
conference paper 2012
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Simons, D.G. (author), Snellen, M. (author), Siemes, K. (author)
Seafloor characterization is important in many fields including hydrography, marine geology, coastal engineering and habitat mapping. The advantage of non-invasive acoustic methods for sediment characterization over conventional bottom grabbing is the nearly continuous versus sparse sensing and the enormous reduction in survey time and costs....
conference paper 2009
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Snellen, M. (author), Siemes, K. (author), Simons, D.G. (author)
We present a method for accurately estimating the bathymetry from multi-beam echo-sounder (MBES) travel-time measurements in environments with large variations in the water column sound speeds (both temporally and spatially). In this type of environments the water column sound speeds at the time of the MBES transmission are often not known,...
conference paper 2009
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Simons, C.A.B.A.E. (author), Sanabria-Walter, C. (author), Polinder, H. (author)
During the past decades, superconducting electrical machines have become more suitable to replace conventional iron based designs, because of their lower weight and higher torque density. These properties make them good candidates for use in More Electric Aircraft (MEA). Especially helicopter propulsion systems could benefit from the increased...
conference paper 2014
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