Searched for: subject%3A%22AS%255C%2B%255C-%255C%2BAcoustics%255C%2B%2526%255C%2BSonar%22
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Dittrich, M.G. (author), Jansen, H.W. (author)
Improved methods for measuring curve squeal and braking noise have been proposed within the ACOUTRAIN project, intended as input to future standards. In this paper an outline of these methods is given and the underlying considerations are explained. The EU TSI regulation limiting noise emission of new rail vehicles does not yet specify limits...
bookPart 2015
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Dittrich, M.G. (author), de Roo, F. (author), van Zyl, P.S. (author), Jansen, S.T.H. (author), de Graaff, E. (author)
Tyre-road noise is still a major and growing issue in Europe. A recent study performed in The Netherlands for the Dutch Ministry of Infrastructure and Environment examined the benefits of widescale introduction of high quality labeled tyres, with ‘Triple A’ rating for rolling resistance, wet grip and noise. Two scenarios were investigated, one...
conference paper 2015
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Kvadsheim, P.H. (author), Lam, F.P.A. (author), Miller, P. (author), Sivle, L.D. (author), Wensveen, P.J. (author), Roos, M. (author), Tyack, P.L. (author), Kleivane, L. (author), Visser, F. (author), Cure, C. (author), van IJsselmuide, S.P. (author), Isojunno, S. (author), von Benda-Beckmann, A.M. (author), Nordlund, N. (author), Dekeling, R.P.A. (author)
In order to properly consider how behavioral responses to anthropogenic noise affect marine mammals and establish safety limits for sonar operations, there is a need to establish behavioral impact criteria. In order to achieve this, knowledge about how marine mammals might respond, thresholds and durations of responses as well as the biological...
report 2015
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van der Rots, R. (author), Berkhoff, A.P. (author)
This paper describes numerical and experimental results of beamforming algorithms for generation of directional sound. The intended application is a sound source for cars with the objective to warn vulnerable road users while minimising noise pollution. Nowadays, sensors exist which are able to reveal the position of the vulnerable road users,...
article 2015
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Sivle, L.D. (author), Kvadsheim, P.H. (author), Ainslie, M.A. (author)
For conservation purposes, it is important to evaluate potential population consequences of noise disturbance. Based on maximum reported sound levels of no response to sonar, a mathematical model is used to predict the potential risk to the population of herring (Clupea harengus) when these levels are exceeded. Results show that risk varies with...
article 2015
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Dittrich, M.G. (author), Létourneaux, F. (author), Dupuis, H. (author)
A measurement method for combined roughness, track decay rates and transfer functions derived from rail vibration during a train pass-by was initially developed in the late nineties [1]. This method was later implemented in software tools [2] and applied in several countries for various purposes [3, 4, 5]. Due to the broad application potential...
bookPart 2015
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Ho, J.H. (author), Berkhoff, A.P. (author)
This paper presents an acoustic source with a small thickness and high bending stiffness. The high bending stiffness is obtained with a sandwich structure in which the face of the sandwich structure internal to the source is perforated to increase the acoustic compliance, thereby leading to increased electroacoustic conversion efficiency....
article 2015
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Colin, M.E.G.D. (author), Ainslie, M.A. (author), Binnerts, B. (author), de Jong, C.A.F. (author), Karasalo, I. (author), Östberg, M. (author), Sertlek, H.O. (author), Folegot, T. (author), Clorennec, D. (author)
The SONIC (Suppression Of underwater Noise Induced by Cavitation) and AQUO (Achieve QUieter Oceans by shipping noise footprint reduction) projects were awarded within the European Seventh Framework Program to develop tools to investigate and mitigate the effects of underwater sound generated by shipping activities on marine life. Model generated...
conference paper 2015
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Harris, C.M. (author), Sadykova, D. (author), DeRuiter, S.L. (author), Tyack, P.L. (author), Miller, P.J.O. (author), Kvadsheim, P.H. (author), Lam, F.P.A. (author), Thomas, L. (author)
Behavioral response studies (BRSs) aim to enhance our understanding of the behavior changes made by animals in response to specific exposure levels of different stimuli, often presented in an increasing dosage. Here, we focus on BRSs that aim to understand behavioral responses of free-ranging whales and dolphins to manmade acoustic signals ...
article 2015
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von Benda-Beckmann, A.M. (author), Aarts, G. (author), Sertlek, H.O. (author), Lucke, K. (author), Verboom, W.C. (author), Kastelein, R.A. (author), Ketten, D.R. (author), van Bemmelen, R. (author), Lam, F.P.A. (author), Kirkwood, R. (author), Ainslie, M.A. (author)
(UXO) are still present in the North Sea. UXO are frequently accidentally encountered by fishermen and dredging vessels. Out of concern for human safety and to avoid damage to equipment and infrastructure from uncontrolled explosions, most reported UXO found in the Dutch Continental Shelf (DCS) are detonated in a controlled way. These underwater...
article 2015
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Dittrich, M.G. (author), Bosshaart, C. (author), Wessels, P.W. (author)
As part of a recent renovation of the Erasmus bridge in Rotterdam, improvements were made to reduce impact noise caused by trams passing a series of rai! joints. The bridge inciudes several different sections inciuding a bascule bridge and is in an inner city tocation with new adjacent apartment buildings. At request of public transport company...
conference paper 2015
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van Neer, P.L.M.J. (author), Rasmijn, L.N.R. (author), Franse, W.J.M. (author), Geers, L. (author), Rasidovic, A. (author), Volker, A.W.F. (author)
Lately, there has been significant interest in the noninvasive manipulation of particles and liquids. The reported acoustic methods rely on either the acoustic radiation force or acoustic streaming. The latter can be used in developed flows to induce fluid velocities angled to the liquid flow direction. These methods often use standing wave...
conference paper 2015
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Curé, C. (author), Doksæter Sivle, L. (author), Visser, F. (author), Wensveen, P.J. (author), Isojunno, S. (author), Harris, C.M. (author), Kvadsheim, P.H. (author), Lam, F.P. (author), Millewr, P.J.O. (author)
Anti-predator strategies are often defined as ‘flight’ or ‘fight’, based upon prey anatomical adaptations for size, morphology and weapons, as well as observed behaviours in the presence of predators. The humpback whale Megaptera nova eangliae is considered a ‘fight’ specialist based upon anatomy and observations of grouping behaviour and active...
article 2015
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Kastelein, R.A. (author), Hoek, L. (author), Gransier, R. (author), de Jong, C.A.F. (author), Terhune, J.M. (author), Jennings, N. (author)
Acoustic Mitigation Devices (AMDs) are used to deter marine mammals from construction sites, in order to prevent hearing injury by offshore pile driving noise. To estimate the distance at which two AMDs designed as ‘seal scarers’ (Ace Aquatec and Lofitech) are detected by harbor porpoises, the 50% hearing detection thresholds for playbacks of...
article 2015
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Dittrich, M.G. (author), de Roo, F. (author), Eisses, R.R. (author)
An exploratory study bas been undertaken to put into perspective future impact of road and railway noise until 2050 in The Netherlands, taking into account potential economic and mobitity growth, noise policy and legislation, demography and technical progress. Estimates were made of average noise levels and numbers of annoyed and sleep disturbed...
conference paper 2015
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Sivle, L.D. (author), Kvadsheim, P.H. (author), Cure, C. (author), Isojunno, S. (author), Wensveen, P.J. (author), Lam, F.P.A. (author), Visser, F. (author), Kleivane, L. (author), Tyack, P.L. (author), Harris, C.M. (author), Miller, P.J.O. (author)
Controlled exposure experiments using 1 to2 kHz sonar signals were conducted with 11 humpback whales (Megaptera novaeangliae), one minke whale (Balaenoptera acutorostrata), and one northern bottlenose whale (Hyperoodon ampullatus) during three field trials from 2011 to 2013. Ship approaches without sonar transmis-sions, playbacks of killer whale...
article 2015
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Lam, F.P.A. (author), Kvadsheim, P.H. (author)
article 2015
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Vos, H.J. (author), van Neer, P.L.M.J. (author), Verweij, M.D. (author), de Jong, N. (author), Volker, A.W.F. (author)
Three-dimensional (3D) high resolution beamforming is made more difficult by high data rates. This can be overcome by two-step imaging approaches such as the synthetic aperture beamforming technique. In this technique the first step significantly reduces the data rate by line-based delay and sum, whereas the second stage recombines the data to a...
conference paper 2015
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Dol, H.S. (author), Colin, M.E.G.D. (author), van Walree, P.A. (author), Otnes, R. (author)
Abstract—In the framework of a bilateral Netherlands-Norway defense research cooperation (2014-2017) between The Netherlands Defence Materiel Organisation (DMO NL) and Forsvarets forskningsinstitutt (FFI NO), it has been shown that a compact general-purpose processor board developed for smartphones can be successfully used for real-time...
conference paper 2015
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Berkhoff, A.P. (author), van Ophem, S. (author)
Noise reduction in feedforward active noise control systems with a rapidly changing primary path requires rapid convergence and fast tracking. This can be accomplished with a fast-array Kalman method which uses an efficient rotation matrix technique to calculate the filter parameters. However, finite precision effects lead to unstable behavior....
conference paper 2015
Searched for: subject%3A%22AS%255C%2B%255C-%255C%2BAcoustics%255C%2B%2526%255C%2BSonar%22
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