Searched for: subject:"AS%5C+%5C-%5C+Acoustics%5C+%26%5C+Sonar"
(1 - 20 of 336)

Pages

document
Lippert, T. (author), Ainslie, M.A. (author), von Estorff, O. (author)
Sound produced by marine pile driving activities poses a possible risk to marine life. The assessment and mitigation of this risk requires a precise prediction of the expected levels. An analytical approach to estimate the radiated sound exposure levels is presented, based on the axial symmetry of the problem, resulting in damped cylindrical...
article 2018
document
Harris, C.M. (author), Thomas, L. (author), Falcone, E.A. (author), Hildebrand, J. (author), Houser, D. (author), Kvadsheim, P.H. (author), Lam, F.P.A. (author), Miller, P.J.O. (author), Moretti, D.J. (author), Read, A.J. (author), Slabbekoorn, H. (author), Southall, B.L. (author), Tyack, P.L. (author), Wartzok, D. (author), Janik, V.M. (author)
Marine mammals may be negatively affected by anthropogenic noise. Behavioural response studies (BRS) aim to establish a relationship between noise exposure conditions (dose) from a potential stressor and associated behavioural responses of animals. A recent series of BRS have focused on the effects of naval sonar sounds on cetaceans. Here, we...
article 2018
document
von Benda-Beckmann, A.M. (author), Thomas, L. (author), Tyack, P.L. (author), Ainslie, M.A. (author)
Passive acoustic monitoring with widely-dispersed hydrophones has been suggested as a cost-effective method to monitor population densities of echolocating marine mammals. This requires an estimate of the area around each receiver over which vocalizations are detected - the "effective detection area" (EDA). In the absence of auxiliary...
article 2018
document
van Neer, P.L.M.J. (author), Piras, D. (author), Koek, W. (author), van Zwet, E. (author), Sadeghian, H. (author)
conference paper 2017
document
Jansen, H.W. (author), de Jong, C.A.F. (author)
Thecontributionofshippingnoisetothebackground noise in the seas can be estimated by shipping noise maps. Noise maps can be made by applying appropriate modeling tools for underwater sound propagation and ship source levels to information on the acoustic environment and on the ship traffic in the area of the map. The development of reliable source...
article 2017
document
Pinto, J. (author), Ribeiro, M. (author), Giodini, S. (author), L'Hoir, P. (author), Sartore, A. (author), Giron-Sierra, J.M. (author), Braga, J. (author), Sousa, J. (author)
In this paper we present the NECSAVE system which allows the control of heterogeneous unmanned vehicles under challenging environments by a single human operator by providing it with the desired highlevel objectives. The described software stack takes care of decomposing the high-level objectives into assignable tasks and (re)distributing the...
conference paper 2017
document
Liu, Z. (author), Htein, L. (author), Cheng, L.K. (author), Martina, Q. (author), Jansen, R. (author), Tam, H.Y. (author)
In this paper, we present a miniature fluidic flow sensor based on a short fiber Bragg grating inscribed in a single mode fiber and heated by Co2+-doped multimode fibers. The proposed flow sensor was employed to measure the flow rates of oil and water, showing good sensitivity of 0.339 nm/(m/s) and 0.578 nm/(m/s) for water and oil, flowing at v ...
article 2017
document
van der Eerden, F.J.M. (author), Wessels, P.W. (author), Basten, T.G.H. (author), Botteldooren, D. (author), van Rentherghem, T. (author), de Coensel, B. (author)
A long-term monitoring project, with 12 months of continuous operation time, is described where the sound sources within a large industrial area as well as the sound levels in the nearby residential area are measured. The sources in the industrial area may give rise to complaints from the neighboring residential areas, at several kilometers...
conference paper 2017
document
Bosschaart, C. (author), Jansen, H.W. (author), de Jong, C.A.F. (author), Basten, T. (author)
A concept for underwater machinery noise mitigation of future civil and military ships is the application of a common deck structure, supporting multiple machines, which is installed on resilient mounts on the ship's foundation structure. TNO is addressing the availability and testing of tools to be able to set realistic targets for the radiated...
conference paper 2017
document
Volker, A.W.F. (author), van Neer, P.L.M.J. (author)
Proper spatial sampling is critical for many applications. If the sampling criterion is not met, artifacts appear for example in images. Last year an iterative approach was presented using wave field extrapolation to interpolate spatially aliased signals. The main idea behind this approach is that after inverse wave field extrapolation the...
conference paper 2017
document
Botteldooren, D. (author), van Renterghem, T. (author), van der Eerden, F.J.M. (author), Wessels, P.W. (author), Basten, T.G.H. (author), de Coensel, B. (author)
Source localization using microphone arrays has now become common practice for many applications. Their application for long term monitoring of industrial noise nevertheless remains uncommon. Hence, in 2016 we deployed four microphone arrays near a large industrial area for a period of 12 months and explored the challenges involved. The...
conference paper 2017
document
Heaney, K.D. (author), Prior, M. (author), Campbell, R.L. (author)
The ocean is nearly transparent to low frequency sound permitting the observation of distant events such as earthquakes or explosions at fully basin scales. For very low frequency the ocean acts as a shallow-water waveguide and lateral variability in bathymetry can lead to out-of-plane effects. In this paper, data from the International...
article 2017
document
Kvadsheim, P.H. (author), DeRuiter, S. (author), Sivle, L.D. (author), Goldbogen, J. (author), Hansen, R.R. (author), Miller, P. (author), Lam, F.P.A. (author), Calambokidis, J. (author), Friedlaender, A. (author), Tyack, P. (author), Kleivane, L. (author), Southall, B. (author)
Minke whales are difficult to study and little information exists regarding their responses to anthropogenic sound. This study pools data from behavioural response studies off California and Norway. Data are derived from four tagged animals, of which one from each location was exposed to naval sonar signals. Statistical analyses were conducted...
article 2017
document
Liu, Z. (author), Htein, L. (author), Cheng, L.K. (author), Martina, Q.E.V.N. (author), Jansen, T.H. (author), Tam, H.Y. (author)
In this paper, we present a miniature fluidic flowmeter based on a packaged FBG and laser-heated fibers. The flow rates of water and hydraulic oil were measured by utilizing the proposed flowmeter. The measured results exhibited good sensitivity of 0.339 nm/(m/s) for water and 0.578 nm/(m/s) for oil flow. Experimental results showed that the...
conference paper 2017
document
van Neer, P.L.M.J. (author), Vos, H.J. (author), Volker, A.F.W. (author)
conference paper 2017
document
Volker, A.W.F. (author), Brandenburg, M. (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. There are many situations where the actual defect location is not accessible, e.g., a pipe support or a partially buried pipe. Last year an approach...
conference paper 2017
document
Noack, B. (author), Sijs, J. (author), Hanebeck, U.D. (author)
For decentralized fusion problems, ellipsoidal intersection has been proposed as an efficient fusion rule that provides less conservative results as compared to the well-know ovariance intersection method. Ellipsoidal intersection relies on the computation of a common estimate that is shared by the estimates to be fused. In this paper, an...
conference paper 2017
document
Berkhoff, A. (author), Tajdari, F. (author)
This paper presents a method to realize an acoustic source for low frequencies with relatively small thickness. A honeycomb plate structure which is open on one side combines the radiating surface and the major part of the air cavity. The vibration of the plate is controlled with a decentralized feedback controller. The fundamental resonance...
conference paper 2017
document
Wensveen, P.J. (author), Kvadsheim, P.H. (author), Lam, F.P.A. (author), von Benda-Beckmann, A.M. (author), Sivle, L.D. (author), Visser, F. (author), Cure, C. (author), Tyack, P.L. (author), Miller, P.J.O. (author)
Exposure to underwater sound can cause permanent hearing loss and other physiological effects in marine animals. To reduce this risk, naval sonars are sometimes gradually increased in intensity at the start of transmission ('ramp-up'). Here, we conducted experiments in which tagged humpback whales were approached with a ship to test whether a...
article 2017
document
Blom, K.H.C. (author), Dol, H.S. (author), Prior, M.K. (author)
There is a growing interest in the use of untethered underwater vehicles. These vehicles require robust and error-free underwater communication for transmission of mission-critical data. In contrast, the requirements for sensor payloads are often less stringent. Depending on the type of data, different Quality-ofService (QoS) demands can be...
conference paper 2017
Searched for: subject:"AS%5C+%5C-%5C+Acoustics%5C+%26%5C+Sonar"
(1 - 20 of 336)

Pages