Searched for: subject:"Acoustic"
(1 - 20 of 909)

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Kotti, S.E. (author), Heusdens, R. (author), Hendriks, R.C. (author)
The use of wireless acoustic sensor networks (WASNs) has received increased attention over the last decade. The advantages of WASNs over stand-alone multi-microphone devices are that the microphone array is not anymore limited by the dimensions of a single device, and that microphones can be placed at arbitrary locations. One of the...
conference paper 2021
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Massaad, J. (author), van Neer, P.L.M.J. (author), van Willigen, D.M. (author), Sabbadini, A. (author), de Jong, N. (author), Pertijs, M.A.P. (author), Verweij, M.D. (author)
Current ultrasonic clamp-on flow meters consist of a pair of single-element transducers which are carefully positioned before use. This positioning process consists of manually finding the distance between the transducer elements, along the pipe axis, for which maximum SNR is achieved. This distance depends on the sound speed, thickness and...
article 2021
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Massaad, J. (author), van Neer, P.L.M.J. (author), van Willigen, D.M. (author), de Jong, N. (author), Pertijs, M.A.P. (author), Verweij, M.D. (author)
Acoustic wave propagation in ultrasonic flow measurements is typically assumed to be linear and reciprocal.However, if the transmitting transducer generates a sufficiently high pressure, nonlinear wave propagation effects become significant. In flow measurements, this would translate into more information to estimate the flow and therefore a...
article 2021
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Braat-Eggen, E. (author), Reinten, J. (author), Hornikx, M. (author), Kohlrausch, A. (author)
Students can be disturbed by background noise while working in an open-plan study environment. To improve the acoustic quality of open-plan study environments a study was done on the influence of different sound scenarios on students working on a typical student task, “studying for an exam”. Three sound scenarios and a quiet reference sound...
article 2021
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van Neer, P.L.M.J. (author), Quesson, B.A.J. (author), Tamer, M.S. (author), Hatakeyama, K. (author), van Es, M.H. (author), van Riel, M.C.J.M. (author), Piras, D. (author)
Several methods are being researched to detect and characterize buried nanoscale structures in hard solid samples. The most common acoustic method is acoustic microscopy. An acoustic microscope is based on a single element transducer operating in pulse-echo mode. The acoustic waves are coupled into a sample using a liquid couplant (eg water) and...
article 2021
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van Neer, P. (author), Volker, A. (author), Berkhoff, A. (author), Schrama, T. (author), Akkerman, H. (author), van Breemen, A. (author), Peeters, L. (author), van der Steen, J.L. (author), Gelinck, G.H. (author)
Ultrasound based mid-air haptic feedback devices can produce tactile sensations at any time and position without restricting human motion. This is useful for augmented and virtual reality, feedback buttons and virtual user interfaces. The haptic feedback mechanism is caused by acoustic radiation force and streaming. Typical solutions to induce...
conference paper 2020
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van Es, M.H. (author), Quesson, B.A.J. (author), Mohtashami, A. (author), Piras, D. (author), Hatakeyama, K. (author), Fillinger, L. (author), van Neer, P.L.M.J. (author)
In order to extract ever more performance from semiconductor devices on the same device area, the semiconductor industry is moving towards device structures with increasingly complex material combinations and 3D geometries. To ensure cost effective fabrication of next generation devices, metrology solutions are needed that tackle the specific...
conference paper 2020
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Müller, R.A.J. (author), von Benda-Beckmann, A.M. (author), Halvorsen, M.B. (author), Ainslie, M.A. (author)
Regulations for underwater anthropogenic noise are typically formulated in terms of peak sound pressure, root-mean-square sound pressure, and (weighted or unweighted) sound exposure. Sound effect studies on humans and other terrestrial mammals suggest that in addition to these metrics, the impulsiveness of sound (often quantified by its kurtosis...
article 2020
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Tajdari, F. (author), Berkhoff, A.P. (author), de Boer, A. (author)
This paper focuses on extensive numerical and experimental investigations of a thin sandwich acoustic source. Due to an energy inefficient actuation design, a thin sandwich acoustic source that was proposed in an early study is redesigned and reconstructed in the current research. The thin acoustic source in the present paper is actuated by long...
article 2020
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van Es, M.H. (author), Quesson, B.A.J. (author), Mohtashami, A. (author), Piras, D. (author), Hatakeyama, K. (author), Fillinger, L. (author), van Neer, P.L.M.J. (author)
In order to extract ever more performance from semiconductor devices on the same device area, the semiconductor industry is moving towards device structures with increasingly complex material combinations and 3D geometries. To ensure cost effective fabrication of next generation devices, metrology solutions are needed that tackle the specific...
conference paper 2020
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Zebregs, M. (author), Mayer, A.E.H.J. (author), van der Heijden, A.E.D.M. (author)
In this comparative study, a solid composite, AN/HTPB-based propellant was prepared by conventional processing in a mechanical mixer and by applying an advanced processing technique relying on resonant acoustic mixing (RAM). After curing of the propellants, cross-sections were prepared and characterized by scanning electron microscopy. Also the...
article 2020
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Phogat, R. (author), González Díez, N. (author), Smeulers, J.P.M. (author), Casalino, D. (author), Avallone, F. (author)
Impeller rotation, vortex shedding, secondary flows or a combination of these phenomena can lead to the generation of acoustic waves in the compressor cascade causing dynamic pressure loading on the impeller. When the eigenfrequency and eigenmode shape of the acoustic mode match with the structural ones of the impeller, high fatigue stresses and...
conference paper 2020
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Tajdari, F. (author), Berkhoff, A.P. (author), van der Zee, R.A.R. (author), de Boer, A. (author)
article 2020
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Tajdari, F. (author), Berkhoff, A.P. (author), de Boer, A. (author)
This paper studies an acoustic source with a relatively small thickness and a high bending stiffness. The acoustic source operates in the low frequency, quasi-static regime. The focus of the current study is on the actuation part in order to design an appropriate excitation mechanism. A flexural mechanism is modeled in combination with a...
article 2020
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Berkhoff, A. (author)
conference paper 2020
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Dol, H.S. (author), van den Bos, R. (author)
There are situations in which divers need to find their way to an unknown location within acoustic communication range as quickly as possible without broadcasting additional energy besides that of already transmitted acoustic communi cation signals, e.g., for acoustic covertness or saving battery life. For these situations, a prototype of a...
conference paper 2020
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Prior, M.K. (author), Duncan, A.J. (author), Sertlek, H.Ö. (author), Ainslie, M.A. (author)
Comparisons are made of sound pressure and particle acceleration predicted by two methods in the vicinity of two arrays of marine-seismic airguns. Data describing the array properties and the environmental conditions are taken from test cases designed to facilitate intermodel comparison.The two propagation approaches, one based on method of...
article 2019
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Ainslie, M.A. (author), Laws, R.M. (author), Sertlek, H.O. (author)
Computer models can be used to predict the sound field near an airgun or airgun array. The accuracy of such predictions can be assessed either by a process of verification (comparison with alternative theoretical solution to the same computational problem) or by validation (comparison with measurement). A set of verification test problems is...
article 2019
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van Neer, P.M.L.J. (author), Quesson, B.A.J. (author), van Es, M.H. (author), van Riel, M.C.J.M. (author), Hatakeyama, K. (author), Mohtashami, A. (author), Piras, D. (author), Duivenvoorde, T. (author), van der Lans, M.J. (author), Sadeghian Marnani, H. (author)
The characterization of buried nanoscale structures nondestructively is an important challenge in a number of applications, such as defect detection and metrology in the semiconductor industry. A promising technique is Subsurface Scanning Probe Microscopy (SSPM), which combines ultrasound with Atomic Force Microscopy (AFM). Initially, SSPM was...
article 2019
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Saeed, A. (author), Volker, A.W.F. (author), Martina, Q. (author), Alalouni, A. (author)
Scale and corrosion affect the production certainty of oil and gas well. Scale build-up reduces flow and ultimately could shut down production when it block to tubing completely. Corrosion of the tubing wall occurs very often simultaneously with scale build-up and affects the integrity of the tubing wall. Vital information about the integrity is...
conference paper 2019
Searched for: subject:"Acoustic"
(1 - 20 of 909)

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