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- Merino Martinez, R. (author), Neri, Eleonora (author), Snellen, M. (author), Kennedy, J (author), Simons, D.G. (author), Bennett, Gareth J. (author) conference paper 2017
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Mohammadloo, Tannaz H. (author), Tengku Ali, T.A. (author), Snellen, M. (author), Koop, L. (author), Gaida, T.C. (author), Simons, D.G. (author)Knowing the morphology and sediment composition of the seabed is of high importance for various applications. In this contribution, the repeatability of acoustic seafloor classification (ASC) results obtained from MBES backscatter value is investigated. The unsupervised classification algorithm based on Principal Component Analysis has been...conference paper 2017
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Mohammadloo, Tannaz H. (author), Snellen, M. (author), Simons, D.G. (author)The most recent generation multi-beam echosounders (MBES) allows to transmit Frequency Modulated (FM) signals, in addition to the more conventional Continuous Wave (CW) pulses. In this contribution, the effect of using these FM pulses for bathymetric measurements is investigated. Advantage of using FM signals is that measurements can be taken at...conference paper 2017
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- Mohammadloo, Tannaz H. (author), Snellen, M. (author), Simons, D.G. (author), Dierikx, Ben (author), Bicknese, Simon (author) conference paper 2017
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Pieren, R.D. (author), Heutschi, Kurt (author), Aalmoes, R (author), Simons, D.G. (author)By directly addressing the hearing sensation, auralization is an intuitive means for the assessment and communication of noise scenarios. Authenticity can be fu1iher improved by offering visual information. Currently, various auralization and visualization systems exist, that differ with respect to their sound and image signal generation as well...conference paper 2017
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- Simons, D.G. (author), Snellen, M. (author), Merino Martinez, R. (author), Malgoezar, A.M.N. (author) conference paper 2017
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Vieira, A.E. (author), Snellen, M. (author), Simons, D.G. (author)The shielding of engine noise by the aircraft wings and fuselage can lead to a significant reduction on perceived noise on ground. Most research on noise shielding is focused on BlendedWing Body (BWB) configurations because of the large dimension of the fuselage. However, noise shielding is also considered relevant in conventional tube and...conference paper 2017
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Jones, Robin (author), Diehl, J.C. (author), Simons, Leon (author), Verwaal, M. (author)Preparation of Injera, the cultural staple bread food<br/>item in Ethiopia, is known for its intensive energy consuming<br/>cooking. Baking this food item in the traditional three stone stoves,<br/>with an efficiency of 5-15%, consumes huge amounts of firewood<br/>and causes consequent problems like deforestation, global warming<br/>and...conference paper 2017
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Malgoezar, A.M.N. (author), Snellen, M. (author), Sijtsma, P. (author), Simons, D.G. (author)Assigning proper positions to microphones within arrays is essential in order to reduce or eliminate side- and grating lobes in 2D beamform images. In this paper an objective function is derived providing a measure for the presence of artificial sources. Using the global optimization method Differential Evolution an optimized microphone...conference paper 2016
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Simons, E.C. (author), Weerheijm, J. (author), Sluys, Lambertus J. (author)The Johnson-Holmquist-2 ceramic model is used for quasi-static indentation simulation. A modification is proposed to an associated plasticity formulation. This allows for a fully implicit solution scheme, where dilatation is used instead of the traditional explicit bulking formulation. Dilatation is shown to have an important influence on ring...conference paper 2016
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Merino Martinez, R. (author), Snellen, M. (author), Simons, D.G. (author)Aircraft noise is becoming an increasingly important problem for the aerospace industry and for the residents living in the vicinities of airports. For efforts aiming at reducing aircraft noise levels, it is important to know all the aircraft elements which generate noise and their relative contribution. Experimental measurements with aircraft...conference paper 2016
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Blinstrub, J. (author), Heinze, W (author), Bertsch, E.L. (author), Simons, D.G. (author), Snellen, M. (author)An innovative aircraft design of the Collaborative Research Centre (SFB) 880 features a new active high-lift system. This high-lift system is comprised of a droop-nose leading edge device and a Coanda flap as the trailing edge device. It offers very high lift coefficients and thus the ability to operate at airports that have reduced runway...conference paper 2016
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Malgoezar, A.M.N. (author), Snellen, M. (author), Simons, D.G. (author), Sijtsma, P. (author)Conventional beamforming is a common method to localize sound sources with a microphone array. The method, which is based on the delay-and-sum beamforming, provides an estimate value for the source strength at a given spatial position. It suffers from low spatial resolution at low frequencies, high side lobe levels and requires the user to...conference paper 2016
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Sahai, A.K. (author), Simons, D.G. (author)This paper aims to present a way with which audible differences in measured and auralized (i.e. aurally simulated) aircraft noise can be quantified. The purpose of the study is to find a means with which the subjective differences between measured and synthesized sounds can be expressed in an objective manner. The quantification would firstly...conference paper 2016
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Merino Martinez, R. (author), Snellen, M. (author), Simons, D.G. (author)Airframe noise is becoming increasingly important during approach, even reaching higher noise levels than the engines in some cases. More people are a_ected due to low ight altitudes and _xed tra_c routing associated with typical approaches. For most air- craft types, the landing gear system is a dominant airframe noise source. However, this...conference paper 2016
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Merino Martinez, R. (author), Snellen, M. (author), Simons, D.G. (author)Nowadays, aircraft noise is one of the major problems to be dealt with by the aerospace industry and especially suffered by the residents living in the vicinities of airports. The enforcement of noise control environmental laws around airports is hindered due to the large variability observed in the noise levels for flyovers of the same aircraft...conference paper 2016
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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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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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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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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