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Willems, F. (author), van Gompel, P. (author), Seykens, X. (author), Wilkins, S. (author)This work gives an outlook on the potential of automated driving functions (ADFs) to reduce real-world CO2 and pollutant emissions for heavy-duty powertrains. Up to now, ADF research mainly focuses on increased traffic safety, driver comfort, and road capacity. Studies on emissions are lacking. By taking the driver out-of-the-loop, cycle-to...conference paper 2019
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- Willems, F.P.T. (author) conference paper 2018
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Behrouzian, A. (author), Goswami, D. (author), Basten, A.A. (author)Feedback control applications are robust to occasional deadline misses. This opens up the possibility of saving scarce (computation and communication) resources on embedded platforms. Stability and performance requirements of a control loop impose restrictions on acceptable patterns of deadline misses (e.g., not too many misses in a row). Such...conference paper 2018
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Acciani, F. (author), Frasca, P. (author), Stoorvogel, A. (author), Semsar-Kazerooni, E. (author), Heijenk, G. (author)Cooperative Adaptive Cruise Control (CACC) is nowadays a promising technique to increase highway through-put, safety and comfort for vehicles. Enabled by wireless communication, CACC allows a platoon of vehicles to achieve better performance than Adaptive Cruise Control; however, since wireless is employed, problems related to unreliability...conference paper 2018
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- Tukker, A. (author), Giljum, S. (author), Wood, R. (author) article 2018
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- Wilkins, S. (author), van Sterkenburg, S. (author), Hoedemaekers, E.R.G. (author), Rosca, B. (author), Danilov, D. (author), Baert, R.S.G. (author) conference paper 2017
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Witvoet, G. (author), Doelman, N.J. (author), den Breeje, R. (author)Future large telescopes, such as E-ELT and TMT, will need feedback control of the thousands of actuators underneath their segmented primary mirrors (M1). Differences in actuator dynamics and spatially and temporally changing disturbances make it extremely diffcult to formulate classical controllers which are both suffciently robust and highly...conference paper 2016
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Pournaras, E. (author), Vasirani, M. (author), Kooij, R.E. (author), Aberer, K. (author)The robustness of smart grids is challenged by unpredictable power peaks or temporal demand oscillations that can cause blackouts and increase supply costs. Planning of demand can mitigate these effects and increase robustness. However, the impact on consumers in regards to the discomfort they experience as a result of improving robustness is...article 2014
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Ouboter, T.M. (author), Worm, D.T.H. (author), Kooij, R.E. (author), Wang, H. (author)In this paper we propose strategies to increase the robustness of a communication network which depends on the proper functioning of an electricity network. The strategies involve selecting nodes of the communication network and removing their dependency on the electricity network. Compared to existing literature on this topic, such as Schneider...conference paper 2014
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Koc, Y. (author), Warnier, M. (author), Kooij, R.E. (author), Brazier, F.M.T. (author)Cascading failures are the main reason blackouts occur in power networks. The economic cost of such failures is in the order of tens of billion dollars annually. In a power network, the cascading failure phenomenon is related to both topological properties (number and types of buses, density of transmission lines and interconnection of...conference paper 2013
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van Dijk, N.J.M. (author), van de Wouw, N. (author), Doppenberg, E.J.J. (author), Oosterling, H.A.J. (author), Nijmeijer, H. (author)Chatter is an instability phenomenon in machining processes which limits productivity and results in inferior workpiece quality, noise and rapid tool wear. The increasing demand for productivity in the manufacturing community motivates the development of an active control strategy to shape the chatter stability boundary of manufacturing...article 2012
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Willems, F.P.T. (author), Cloudt, R.P.M. (author)Selective catalytic reduction (SCR) is a promising diesel aftertreatment technology that enables low nitrogen oxides (NOx) tailpipe emissions with relatively low fuel consumption. Future emission legislation is pushing the boundaries for SCR control systems to achieve high NOx conversion within a tailpipe ammonia (NH3) slip constraint, and to...article 2011
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van Dijk, N. (author), van de Wouw, N. (author), Doppenberg, E.J.J. (author), Oosterling, J.A.J. (author), Nijmeijer, H. (author), TNO Industrie en Techniek (author)Chatter is an instability phenomenon in machining processes which limits productivity and results in inferior workpiece quality, noise and rapid tool wear. The increasing demand for productivity in the manufacturing community motivates the development of an active control strategy to shape the chatter stability boundary of manufacturing...conference paper 2010
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Sijs, J. (author), Lazar, M. (author), Heemels, W.P.M.H. (author)The main purpose of event-based control, if compared to periodic control, is to minimize data transfer or processing power in networked control systems. Current methods have an (implicit) dependency between triggering the events and the control algorithm. To decouple these two, we introduce an event-based state estimator in between the sensor...conference paper 2010
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Williams, D. (author), Kegel, I. (author), Ursu, M. (author), Pals, N. (author), Leurdijk, A. (author), TNO Informatie- en Communicatietechnologie (author)Summary results of the assessment of new tools for the generation of reconfigurable screen media (ShapeShifting media) and of eight experimental ShapeShifting screen media productions covering genres including news, documentary and drama, are presented from the project New Millennium, New Media. The new tools for creating interactive and...conference paper 2007
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van den Berg, J.L. (author), Mandjes, M. (author), Roijers, F. (author), TNO Informatie- en Communicatietechnologie (author)The IEEE 802.11 MAC-protocol, often used in ad-hoc networks, has the tendency to share the capacity equally amongst the active nodes, irrespective of their loads. An inherent drawback of this fair-sharing policy is that a node that serves as a relay-node for multiple flows is likely to become a bottleneck. This paper proposes a flow-level...bookPart 2006
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Hekkenberg, R.T. (author), Richards, A. (author), Beissner, K. (author), Zeqiri, B. (author), Bezemer, R.A. (author), Hodnett, M. (author), Prout, G. (author), Cantrall, C. (author), TNO Kwaliteit van Leven (author)Ultrasound (US) physiotherapy as a clinical treatment is extremely common in the Western world. Internationally, regulation to ensure safe application of US physiotherapy by regular calibration ranges from nil to mandatory. The need for a portable power standard (PPS) has been addressed within a European Community (EC)-funded project. This PPS...article 2006
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Fraanje, P.R. (author), Verhaegen, M. (author), Doelman, N.J. (author), TNO Industrie (author)This letter presents a robustification of the preconditioned Filtered-X LMS algorithm proposed by Elliott et al.. The method optimizes the average performance for probabilistic uncertainty in the secondary path and relaxes the SPR condition for global convergence. It also prevents large amplification in the pre-conditioning filters due to...article 2004
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The edge-based face element method for 3D-stream function and flux calculations in porous media flowZijl, W. (author), Nawalany, M. (author), Nederlands Instituut voor Toegepaste Geowetenschappen TNO (author)We present a velocity-oriented discrete analog of the partial differential equations governing porous media flow: the edge-based face element method. Conventional finite element techniques calculate pressures in the nodes of the grid. However, such methods do not satisfy the requirement of flux continuity at the faces. In contrast, the edge...article 2004
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Fraanje, P.R. (author), Verhaegen, M. (author), Doelman, N.J. (author), Berkhoff, A. (author), Technisch Physische Dienst TNO - TH (author)This paper presents a method to estimate the H2 optimal and a robust feedback controller by means of Subspace Model Identification using the internal model control (IMC) approach. Using IMC an equivalent feed forward control problem is obtained, which is solved by the Causal Wiener filter for the H2 optimal controller. The robust variant, called...article 2004