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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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- 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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Eledlebi, K. (author), Ruta, D. (author), Hildmann, H. (author), Saffre, F. (author), Alhammadi, Y. (author), Isakovic, A. (author)When deploying a wireless sensor network (WSN) identifying optimal locations for the nodes is challenging, especially so if the environment is either (i) unknown or (ii) obstacle-rich. We proposes BISON (Bio-Inspired Self- Organizing Network), a variant of the Voronoi algorithm to address this challenge. Among the features of the approach are...article 2020
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Fockens, T.W.H. (author), Zwamborn, A.P.M. (author), Leferink, F. (author)Radio noise of man-made origin has been measured and studied since the 50s of the past century. From that time on, especially in the last two decades, the electromagnetic environment has changed due to the wide spread and increasingly complicated electronic and computing equipment in domestic and work premises. Not only the character of man-made...article 2019
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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 high bending stiffness. Piezoelectric actuators are used to drive the moving component of the acoustic source. In the current study, a lumped model is used to represent the acoustic source that is excited by a piezoelectric stacked actuator. The equivalent electrical...conference paper 2018
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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
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Tajdari, F. (author), Berkhoff, A.P. (author), de Boer, A. (author)This paper studies a lumped model of an acoustic source with a relatively small thickness and high bending stiffness. Voice coil and piezoelectric actuators are used to drive moving components of the acoustic source. Feedback and feedforward damping control techniques are used to actively obtain a smooth frequency response, especially at low...conference paper 2017
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Ainslie, M.A. (author), de Jong, C.A.F. (author)Because of the history of sonar and sonar engineering, the concept of “source level” is widely used to characterize anthropogenic sound sources, but is it useful for sources other than sonar transmitters? The concept and applicability of source level are reviewed for sonar, air guns, explosions, ships, and pile drivers. International efforts...conference paper 2016
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Erbe, C. (author), Ainslie, M.A. (author), de Jong, C.A.F. (author), Racca, R. (author), Stocker, M. (author)As concern about anthropogenic noise and its impacts on marine fauna is increasing around the globe, data are being compared across populations, species, noise sources, geographic regions, and time. However, much of the raw and processed data are not comparable due to differences in measurement methodology, analysis and reporting, and a lack of...conference paper 2016
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Tajdari, F. (author), Berkhoff, A.P. (author), de Boer, A. (author)The present work describes the electrical, mechanical and acoustical behavior of a thin honey-comb structure as an acoustic source. The acoustic source has to operate in the low frequency, quasi-static regime and is driven by a piezoelectric stack actuator. In addition, a two-way energy flow between the actuator and a connected amplifier is...conference paper 2016
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Dekeling, R. (author), Tasker, M. (author), Ainslie, M. (author), Andersson, M. (author), André, M. (author), Borsani, F. (author), Brensing, K. (author), Castellote, M. (author), Dalen, J. (author), Folegot, T. (author), van der Graaf, S. (author), Leaper, R. (author), Liebschner, A. (author), Pajala, J. (author), Robinson, S. (author), Sigray, P. (author), Sutton, G. (author), Thomsen, F. (author), Werner, S. (author), Wittekind, D. (author), Young, J.V. (author)The European Marine Strategy Framework Directive requires European member states to develop strategies for their marine waters leading to programs of measures that achieve or maintain good environmental status (GES) in all European seas by 2020. An essential step toward reaching GES is the establishment of monitoring programs, enabling the state...conference paper 2016
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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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Swamy, M. (author), Shoeibi Omrani, P. (author), González Díez, N. (author)Gas transport in corrugated pipes often exhibit whistling behavior, due to periodic flow-induced pulsations generated in the pipe cavities. These aero-acoustic sources are strongly dependent on the geometrical dimensions and features of the cavities. As a result, uncertainties in the exact shape and geometry play a significant role in...conference paper 2015
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Basten, T.G.H. (author), Wessels, P.W. (author)The last decade has shown a growing number and wide variety of systems for monitoring environmental noise. This ongoing development is made possible by the availability of cheaper and smaller hardware and innovations in communication networks. The developments are fed by a growing interest in monitoring because it can help in improving noise...conference paper 2014
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Homborg, A.M. (author), van Westing, E.P.M. (author), Tinga, T. (author), Ferrari, G.M. (author), Zhang, X. (author), de Wit, J.H.W. (author), Mol, J.M.C. (author)This study validates the ability of Hilbert spectra to investigate transients in an electrochemical noise signal for an aqueous corrosion inhibition process. The proposed analysis procedure involves the identification and analysis of transients in the electrochemical current noise signal. Their decomposition into instantaneous frequencies in a...article 2014
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Kuo, C.W. (author), Veltin, J. (author), McLaughlin, D.K. (author)Modern military aircraft jet engines are designed with variable-geometry nozzles to provide optimal thrust in different operating conditions, depending on the flight envelope. However, acoustic measurements for such nozzles are scarce, due to the cost involved in making full-scale measurements and the lack of details about the exact geometries...article 2014
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- Salomons, E.M. (author), Janssen, S.A. (author), Verhagen, H.L.M. (author) article 2014
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de Roo, F. (author)The sound reflectivity of noise barriers elements is one of the major acoustic product characteristics. Traditionally this property was tested in reverberation rooms according to EN 1793-1 and the results were used to predict the effect of sound reflections in the far field. As in many cases these results cannot be used directly to assess the...conference paper 2013
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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...conference paper 2013