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Massaad, J. (author), van Neer, P.L.M.J. (author), van Willigen, D.M. (author), Pertijs, M.A.P. (author), de Jong, N. (author), Verweij, M.D. (author)Ultrasonic flow meters (UFMs) based on transducer arrays offer several advantages. With electronic beam steering, it is possible to tune the steering angle of the beam for optimal signal-tonoise ratio (SNR) upon reception. Moreover, multiple beams can be generated to propagate through different travel paths, covering a wider section of the flow...article 2022
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Massaad, J. (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 to...article 2022
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Doekemeijer, B.M. (author), Kern, S. (author), Maturu, S. (author), Kanev, S. (author), Salbert, B. (author), Schreiber, J. (author), Campagnolo, F. (author), Bottasso, C.L. (author), Schuler, S. (author), Wilts, F. (author), Neumann, T. (author), Potenza, G. (author), Calabretta, F. (author), Fioretti, F. (author), van Wingerden, J.W. (author)The concept of wake steering on wind farms for power maximization has gained significant popularity over the last decade. Recent field trials described in the literature not only demonstrate the real potential of wake steering on commercial wind farms but also show that wake steering does not yet consistently lead to an increase in energy...article 2021
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Kanev, S.K. (author), Bot, E. (author), Giles, J. (author)Active wake control (AWC) is a strategy for operating wind farms in such a way as to reduce the wake effects on the wind turbines, potentially increasing the overall power production. There are two concepts to AWC: induction control and wake redirection. The former strategy boils down to down-regulating the upstream turbines in order to increase...article 2020
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Tomar, A.S. (author), Kalose, A. (author), Kural, K. (author), Pauwelussen, J. (author)The adaptation of high capacity vehicles (HCVs) into existing commercial vehicle fleets have been considered a potential solution for reducing emissions, operational costs and infrastructure damages. However, due to increased length and number of articulations, there are challenges associated with HCVs with regard to their manoeuvrability at low...conference paper 2020
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Kanev, S. (author)Active wake control (AWC) is an operational strategy for wind farms that aims at reducing the negative effects of wakes behind wind turbines on the power production and mechanical loads at the wind turbines' downstream. For a given wind direction, the strategy relies on collaborative control of the machines within each row of turbines that...article 2019
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Saathof, R. (author), Crowcombe, W.E. (author), Kuiper, S. (author), van der Valk, N.C.J. (author), Pettazzi, F. (author), de Lange, T.J. (author), Kerkhof, P.J. (author), van Riel, M.C.J.M. (author), de Man, H. (author), Truyens, D.C. (author), Ferrario, I. (author)Optical communications will complement radio frequency (RF) communications in the coming decades to enhance throughput, power efficiency and link security of satellite communication links. To enable optical communications technology for intersatellite links and (bi-directional) ground to satellite links, TNO develops a suite of technologies in...conference paper 2018
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Witvoet, G. (author), Kuiper, S. (author), Meskers, A.J.H. (author)This paper presents the first test results of a novel Fine Steering Mirror (FSM) for optical communication terminals. The FSM utilizes efficient variable reluctance actuators, tailored for the specific application, making it highly compact and power efficient. The test results demonstrate a high dynamical performance of <1.7kHz closed-loop...conference paper 2018
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Kuiper, S. (author), Doelman, N.J. (author), Human, J.D. (author), Saathof, R. (author), Klop, W.A. (author), Maniscalco, M.P. (author)TNO is developing Deformable Mirror (DM) technology, targeted for aberration correction in high-end Adaptive Optics (AO) applications in the field of lithography, astronomy, space and laser communication. The heart of this deformable mirror technology is a unique actuator technology based on the variable reluctance principle. The main advantages...conference paper 2018
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op den Camp, O.M.G.C. (author), Uittenbogaard, J. (author), Bakker, B. (author)To increase traffic safety, systems are being implemented in vehicles that support drivers to avoid or mitigate collisions. Generally, these systems only provide a response to the driver in case of an imminent critical situation. Responses in the form of warning signals and brake or steering actuations are harsh, as they act in the last one to...conference paper 2018
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Schmeitz, A.J.C. (author), Zegers, J. (author), Ploeg, J. (author), Alirezaei, M. (author)Lateral vehicle control is an essential part for many automated and cooperative driving applications. Lane keeping and vehicle following are typical modes of such control system. The aim of this paper is to develop a generic lateral controller that can handle these different modes. Based on the available measurements, either path or single point...conference paper 2017
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Kaustubh, M. (author), Willemsen, D.M.C. (author), Mazo, M. (author)Proponents of autonomous driving pursue driverless technologies, whereas others foresee a gradual transition where there will be automated driving systems that share the control of the vehicle with the driver. With such advances it becomes pertinent that the developed automated systems need to be safe. One crucial aspect of safety is to prove...conference paper 2016
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Alirezaei, M. (author), Jansen, S.T.H. (author), Schmeitz, A.J.C. (author), Madhusudhanan, A.K. (author)The capacity of a vehicle to avoid collisions is predominantly defined by the friction potential of the tyres. A robustness analysis of a Collision Avoidance System is executed by simulation and experiments for extreme changes in tyre friction. The collision avoidance controller which utilizes steering angle is based on the State Dependent...conference paper 2016
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Withagen, J.C.J.G. (author), Annema, A.J. (author), Nauta, B. (author), van Vliet, F.E. (author)Multiple-Input and Multiple-Output (MIMO) arrays provide more degrees of freedom than conventional phased arrays. They require that every transmitting element of the array can be identified when received. One way to achieve this is to give every element its own unique frequency. Offset-transmitters may be used to introduce MIMO or Doppler...conference paper 2016
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van Neer, P.L.M.J. (author), Volker, A.F.W. (author)A proper spatial sampling is critical for high quality imaging. If the sampling criterion is not met, artifacts appear in the image, generally referred to as grating lobes. For inspection efficiency the width of the field of view is becoming larger leading to an increase in the number of elements and therefore transducer complexity and cost. The...conference paper 2015
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van Loon, R.J. (author), Brouwer, R.F.T. (author), Martens, M.H. (author)Internationally, drowsy driving is associated with around 20% of all crashes. Despite the development of different detection methods, driver drowsiness remains a disconcerting public health issue. Detection methods can estimate drowsiness by directly measuring the physiology of the driver, or they can measure the effect that drowsiness has on...article 2015
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Anand, S. (author), Terken, J. (author), Hogema, J. (author)In an earlier study it was found that drivers can adjust quickly to different force feedback levels on the steering wheel, even for such extreme levels as zero feedback. It was hypothesized that, due to lack of cognitive load, participants could easily and quickly learn how to deal with extreme force feedback settings by giving more effort. The...conference paper 2013
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Hogema, J.H. (author), Wewerinke, P.H. (author)In the design and development of advanced vehicle control systems such as X-by-Wire (XBW), system safety is a crucial aspect. Failures in XBW can easily result in accidents. Therefore, methods and tools are needed to ensure fault-tolerant systems. Quantifying the consequence of an error is far from trivial, since the consequence is determined...bookPart 2012
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Anand, S. (author), Terken, J. (author), Hogema, J.H. (author), Martens, J.B. (author)Steer-by-Wire systems enable designers to offer completely personalized steering feel to drivers, unlike existing steering systems that offer limited or no personalization. In this paper we focus on feedback torque level, a significant factor for steering feel. Earlier studies indicate that the preferred feedback torque level may be related to...bookPart 2012
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Anand, S. (author), Terken, J. (author), Hogema, J.H. (author)Steer-by-wire systems provide drivers with the opportunity to personalize steering settings in vehicles. Studies conducted in the past have indicated that preferences for steering effort, one of the factors which affect steering feel, vary based on individual differences that include factors such as age, gender and driving style. These...conference paper 2011
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