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Spagnol, S. (author), Goos, T.G. (author), Reiss, Irwin (author), Ozcan Vieira, E. (author)Inside the Neonatal Intensive Care Unit (NICU), exposure to loud sounds such as acoustic medical alarms can have adverse effects on neonates, parents, and medical staff. With the aim of having an accurate overview of which and how often acoustic medical alarms occur, this paper presents a simple signal processing-based approach for detecting...conference paper 2022
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Zhang, F. (author), Yang, Y. (author), Fennis, Sonja A.A.M. (author), Hendriks, M.A.N. (author)Acoustic emission (AE) signal parameters can be used to classify the source type in concrete structures. However, signal parameters are influenced by the wave propagation from the source to the receiver, leading to wrong source classification results, especially for monitoring large concrete structures. This paper experimentally evaluates the...journal article 2022
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Tomić, Nataša Z. (author), Saeedifar, M. (author), Saleh, M. (author), Marinković, Aleksandar (author), Zarouchas, D. (author), Teixeira De Freitas, S. (author)The aim of this research was to investigate the self-healing potential of damaged Al joints when bonded using novel eco-epoxide adhesives derived from tannic acid (TA). Two eco-epoxy components based on TA, (A) glycidyl ether and (B) glycidyl phosphate ester of TA, were produced. The effect of the eco-epoxy components on the self-healing...journal article 2022
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Li, X. (author), Benedictus, R. (author), Zarouchas, D. (author)Ply-block size and stress level effect on accumulation of transverse cracks and delamination are investigated during early fatigue life of CFRP laminates. Tension-tension fatigue tests under different stress levels were performed for two cross-ply configurations. Edge observation with digital cameras, digital image correlation and acoustic...journal article 2022
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Zhang, F. (author), Yang, Y. (author), Naaktgeboren, N.M. (author), Hendriks, M.A.N. (author)This paper proposes a new damage identification method, namely, the probability density field of acoustic emission (AE) events. This new method provides a different perspective to deal with the uncertainties in the source localization process. We treat the source location as a random variable, and estimate its probability density field based...journal article 2022
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Huijer, A.J. (author), Zhang, X. (author), Kassapoglou, C. (author), Pahlavan, Lotfollah (author)Marine propellers made of fibre-reinforced composites have demonstrated the potential to outperform metallic propellers in terms of efficiency and under-water noise radiation. For full realisation of this potential in a tailored design process with realistic constraints, accurate information on the hydrodynamic loads acting on composite...journal article 2022
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Zhou, W. (author), Butcher, Antony (author), Brisbourne, Alex M. (author), Kufner, Sofia Katerina (author), Kendall, J. Michael (author), Stork, Anna L. (author)Firn densification profiles are an important parameter for ice-sheet mass balance and palaeoclimate studies. One conventional method of investigating firn profiles is using seismic refraction surveys, but these are difficult to upscale to large-area measurements. Distributed acoustic sensing (DAS) presents an opportunity for large-scale...journal article 2022
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von den Hoff, B. (author), Merino Martinez, R. (author), Simons, D.G. (author), Snellen, M. (author)Complex acoustic systems typically present three-dimensional distributions of noise sources. Conventional acoustic imaging methods with planar microphone arrays are unsuitable for three-dimensional acoustic imaging, given the computational demands and the incapability to explicitly account for the presence of multiple sources. This paper...journal article 2022
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Huijer, A.J. (author), Kassapoglou, C. (author), Pahlavan, Lotfollah (author)The recording and processing of acoustic emissions can be used to identify and localise damage mechanisms occurring in engineering structures. In plate-like structures, acoustic emissions propagate through the structure as guided waves. With a measurement location away from the source location, dispersion effects in the guided wave distort...conference paper 2022
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Buisman, M. (author), Martuganova, E.M. (author), Kiers, Tjeerd (author), Draganov, D.S. (author), Kirichek, Alex (author)Purpose<br/><br/>Current surveying techniques used by port authorities to estimate the nautical depth are limited in depth resolution and temporal resolution. Because of this, certain heavily occupied quay walls cannot be optimised in terms of utilisation. Therefore, a permanent continuous measuring system with a higher depth resolution is...journal article 2022
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Wei, Zilong (author), Sun, Xianfu (author), Yang, Fei (author), Ke, Zaitian (author), Lu, Tao (author), Zhang, P. (author), Shen, C. (author)The presence of rail corrugation enlarges the wheel-rail impact and exacerbates the failure of track components, and the situation becomes even worse under high train speed, which promotes the urgent need for an efficient and easily accessible inspection method. Conventional diagnosis approaches such as axle box acceleration (ABA) and image...journal article 2022
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Massaad Mouawad, J.M. (author), van Neer, P.L.M.J. (author), van Willigen, D.M. (author), Noothout, E.C. (author), de Jong, N. (author), Pertijs, M.A.P. (author), Verweij, M.D. (author)Common clamp-on ultrasonic flow meters consist of two single-element transducers placed on the pipe wall. Flow speed is measured noninvasively, i.e., without interrupting the flow and without perforating the pipe wall, which also minimizes safety risks and avoids pressure drops inside the pipe. However, before metering, the transducers have...journal article 2022
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Evers, L.G. (author), Smets, P.S.M. (author), Assink, J. D. (author), Shani-Kadmiel, Shahar (author), Kondo, K. (author), Sugiyama, S. (author)A period of 18 years of infrasonic recordings was analyzed from a microbarometer array (I18DK) in northwestern Greenland, near Qaanaaq. A huge number of infrasonic detections, over 700,000, have been made in I18DKs soundscape during the Arctic summers. Simultaneously identified were both calving events from marine-terminating glaciers and...journal article 2022
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Kawasaki, S. (author), Yeh, Jia-Jun (author), Saccher, M. (author), Li, Jian (author), Dekker, R. (author)The main limitation of acoustic particle separation for microfluidic application is its low sorting efficiency. This is due to the weak coupling of surface acoustic waves (SAWs) into the microchannel. In this work, we demonstrate bulk acoustic wave (BAW) particle sorting using capacitive micromachined ultrasonic transducers (CMUTs) for the first...conference paper 2022
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Quesson, B. A.J. (author), van Neer, P.L.M.J. (author), Tamer, M. S. (author), Hatakeyama, K. (author), Van Es, M. H. (author), van Riel, M.C.A. (author), Piras, D. (author)The semiconductor industry needs to fit ever more devices per unit area to improve their performance; hence a trend towards increasingly complex structures by varying material combinations and 3D geometries with increasing aspect ratios. The new materials used may be optically opaque, posing problems for traditional optical metrology methods....journal article 2022
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Damage mechanism characterization of ±35° and ±55° FW composite tubes using acoustic emission methodAlimirzaei, Sajad (author), Najafabadi, Mehdi Ahmadi (author), Nikbakht, Ali (author), Pahlavan, Lotfollah (author)The focus of this study is to investigate the mechanical properties, of ±35° and ±55° filament wound (FW) composite tubes under axial compression loading using the acoustic emission technique. For this purpose, material failure, crashworthiness characteristics, and the effect of each mechanism on the energy absorption capacity were studied...journal article 2022
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Van der Werf, I. (author), Martinez-Nuevo, Pablo (author), Møller, Martin Bo (author), Hendriks, R.C. (author), Martinez, Jorge (author)The sound field in a room can be represented by a weighted sum of room modes. To estimate the room modes, current literature uses on-the-grid, sparse reconstruction methods. However, these on-the-grid methods are known to suffer from basis mismatch. In this work, we investigate the use of a gridless framework for estimating room modes using...conference paper 2022
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Visschers, Fabian L.L. (author), Massaad Mouawad, J.M. (author), van Neer, P.L.M.J. (author), Verweij, M.D. (author), Liu, Danqing (author), Broer, Dirk J. (author)Coatings with dynamic surface structures are appealing to many applications like haptics and soft robotics. Restrictively, the speed of the surface dynamics in these coatings is often limited to frequencies below 1 kHz, which makes them unsuitable for applications like acoustics and communication optics. This work describes a method to create...journal article 2022
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Rego, Leandro (author), Avallone, F. (author), Ragni, D. (author), Casalino, D. (author), Denayer, Hervé (author)A Helmholtz resonator with a curved cavity is studied for reducing jet-installation noise in a configuration comprised by a subsonic jet and a nearby flat plate. The face-sheet and cavity are designed with the Guess method and the impedance is verified through an experiment and a simulation of an impedance tube. Both single and double degree...journal article 2022
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Simoes dos Santos, D. (author), Fool, F. (author), Kim, Taehoon (author), Noothout, E.C. (author), Rozsa, N.N.M. (author), Vos, H.J. (author), Bosch, Johan G. (author), Pertijs, M.A.P. (author), Verweij, M.D. (author), De Jona, Nico (author)Over the past decades, ultrasound imaging has made considerable progress based on the advancement of imaging systems as well as transducer technology. With the need for advanced transducer arrays with complex designs and technical requirements, there is also a need for suitable tools to characterize such transducers. However, despite the...conference paper 2022