Searched for: author%3A%22de+Boer%2C+A.%22
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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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Tajdari, F. (author), Berkhoff, A.P. (author), Naves, M. (author), Nijenhuis, M. (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 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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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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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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Nieuwenhuizen, L. (author), de Boer, A. (author), Brouwer, C. (author), Huijben, R.N.J. (author), Luiten, G.T. (author), Sterk, M.M.N. (author), Drieman, R. (author)
Het beheer en onderhoud van constructies in bouw en infra kan efficiënter. RFID-chips, voorzien van sensoren en zenders, kunnen bijvoorbeeld continu gegevens over de onderhoudstoestand van betonconstructies naar de beheerder sturen. Ook kunnen de chips worden gebruikt voor het lokaliseren en identificeren van bouwdelen. Daarmee wordt de...
report 2014
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van Vliet, F.E. (author), Klumperink, E.A.M. (author), Soer, M.C.M. (author), Garakoui, S.K. (author), de Boer, A. (author), de Hek, A.P. (author), de Heij, W. (author), Nauta, B. (author)
Phased-Arrays are increasingly used, and require Silicon implementations to result in affordable multi-beam systems. In this paper, CMOS implementations of two novel analogue beamforming multi-channel receivers will be presented. A narrow-band highly linear system exploiting switches and capacitors in advanced CMOS is presented, implementing a...
conference paper 2012
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Dieteren, G.G.A. (author), de Boer, A. (author), Walraven, J. (author)
Het proefbelasten van bruggen is een methode om te bepalen of de constructie de rekenkundige belasting kan dragen. Dit is van belang voor oudere constructies waarvan de draagkracht onbekend is, of die inmiddels aan een grotere belasting worden onderworpen dan waarvoor zij oorspronkelijk zijn ontworpen. Proefbelasten mag echter niet leiden tot...
article 2012
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Gijsbers, F.B.J. (author), van der Veen, C. (author), de Boer, A. (author)
Drukmembraanwerking in dunne druklagen kan zorgen voor een hoger bezwijkdraagvermogen. Bij de TU Delft is onderzoek uitgevoerd naar hoe deze drukmembraanwerking kan worden meegenomen in gewapende druklagen van viaducten metomgekeerde T-liggers. Dit in het kader van het onderzoeksprogramma van Rijkswaterstaat naar het afschuifdraagvermogen van...
article 2012
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Steenbergen, R.D.J.M. (author), de Boer, A. (author)
In Nederland wordt NEN-EN 1991-2 gebruikt voor het bepalen van verkeersbelastingen op verkeersbruggen. In de bijbehorende nationale bijlage worden factoren voorgeschreven om tot de landspecifieke verkeersbelastingen te komen. Door TNO is in samenwerking met Rijkswaterstaat een studie uitgevoerd om aannemelijk te maken dat een brug, ontworpen...
article 2012
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Dieteren, G.G.A. (author), Yang, Y. (author), den Uijl, J. (author), de Boer, A. (author)
Nederlandse bruggen en viaducten van gewapend beton blijken bij een herberekening vaak niet te voldoen aan de geldende voorschriften voor afschuifdraagvermogen. Toch blijken ze de toegenomen verkeersbelasting goed te doorstaan. Op initiatief van Rijkswaterstaat is de afgelopen jaren onderzoek verricht door TNO en TU Delft naar de aanwezige...
article 2012
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Steenbergen, R.D.J.M. (author), de Boer, A. (author), van der Veen, C. (author)
The assessment of the structural safety of existing bridges and viaducts becomes increasingly important in many countries due to the age of the structures and an increase in traffic loads. Many structures need to be reassessed in order to find out whether the safety requirements are met. Most existing standards, however, are developed for the...
article 2012
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de Boer, A. (author), Rodenburg, M. (author), van Dijk, R. (author), van Vliet, F.E. (author), Geurts, M. (author)
An 8 - 10 GHz linearised single-sideband Gilbert upconversion mixer is demonstrated in silicon BiCMOS technology. The QuBiC4X 0.25 μm BiCMOS process of NXP has been used. The device has an integrated local oscillator driver with polyphase quadrature generation. The IF chain uses feedback, selectable gain settings and DC offset circuitry to be...
conference paper 2011
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de Heij, W. (author), de Boer, A. (author), de Hek, A.P. (author), van Vliet, F.E. (author)
A Silicon-Germanium single chip receiver has been developed for S-band phased array radars with 2-D digital beamforming. The complete receiver chain from the S-band RF input up to the low-IF output has been integrated on a single SiGe chip. The only external components required to complete the receiver are an RF limiter for protection against...
conference paper 2011
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de Boer, A. (author), Rodenburg, M. (author), van Dijk, R. (author), van Vliet, F.E. (author), Geurts, M. (author)
An 8 - 10 GHz linearised single-sideband Gilbert upconversion mixer is demonstrated in silicon BiCMOS technology. The QuBiC4X 0.25 μm BiCMOS process of NXP has been used. The device has an integrated local oscillator driver with polyphase quadrature generation. The IF chain uses feedback, selectable gain settings and DC offset circuitry to be...
conference paper 2011
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Steenbergen, R.D.J.M. (author), de Boer, A. (author), van der Veen, C. (author)
Evaluating and upgrading concrete slab bridges is an important issue. A large part of the existing infrastructure has been built about 50 years ago and the design life has been reached or will be reached in the near future. Also traffic loads have increased significantly over the last 50 years. These structures need to be reassessed in order to...
conference paper 2011
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Klein Ikkink, A.J. (author), Boere-Boonekamp, M.M. (author), de Bont, M. (author), de Boer, A. (author), Duys, H. (author), Lo Fo Wong, S. (author), Sachse, H. (author), van Sleuwen, B.E. (author), Veraart-Schelfhout, L. (author), Vriezen, J.A. (author), Westerveld, M.C. (author), TNO Kwaliteit van Leven (author)
article 2010
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Yang, Y. (author), den Uijl, J. (author), Dieteren, G. (author), de Boer, A. (author)
A relatively low direct tensile strength is observed in cores drilled from old bridges in the Netherlands. To check whether this will influence the shear capacity of the bridges, beams sawn from a bridge deck built in 1961 were tested under shear loading in the Stevin laboratory at TU Delft. The flexural capacity of the beams was increased by...
conference paper 2010
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