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van Meer, M. (author), Witvoet, G. (author), Oomen, T. (author)Switched reluctance motors are appealing because they are inexpensive in both construction and maintenance. The aim of this paper is to develop a commutation function that linearizes the nonlinear motor dynamics in such a way that the torque ripple is reduced. To this end, a convex optimization problem is posed that directly penalizes torque...article 2022
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- Basten, T. (author), Bastos, J. (author), Medina, R. (author), van der Sanden, B. (author), Geilen, M.C.W. (author), Goswami, D. (author), Reniers, M.A. (author), Stuijk, S. (author), Voeten, J.P.M. (author) bookPart 2020
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Kramer, L. (author), Peters, J. (author), Voorhoeve, R.J. (author), Witvoet, G. (author), Kuiper, S. (author)The demand for higher data transfer between satellites and ground stations is ever increasing. To address this, (free-space) optical communication (OC) technology is emerging. Pointing mechanisms with low size, weight and power (SWaP), high accuracy and low recurring costs are key enablers for constellations of OC systems. In this paper, TNO...conference paper 2020
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Engels, W.P. (author), van der Hoek, D. (author), Yu, W. (author), Reyes Baez, R. (author)Many wind turbines are still controlled using gain scheduled, PI(D) controllers. Another option is to use a state feedback controller, such as LQG control. However, for wind turbines that is not straight forward solution, because the system is non-linear and the impact of pitching on the states varies in time. This paper presents a variation on...conference paper 2020
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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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van der Weijst, R. (author), van Keulen, T. (author), Willems, F.P.T. (author)Advanced control concepts are required to maximize the fuel-efficiency of Diesel engines and to comply with emission legislation. The aim of this paper is to develop a controller that fully utilizes the fuel-path and air-path hardware, and is adaptive for real-world disturbances. The control design comprises a feedback control system, which uses...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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Witvoet, G. (author), Human, J.D. (author), Maniscalco, M.P. (author)An active tilt mirror mechanism, meant for correction of the constellation breathing of the evolved Laser Interferometer Space Antenna, has been designed and realized. Its open-loop performance has been characterized in both time and frequency domain. Based on this, a feedback controller has been designed and the resulting closed-loop...conference paper 2016
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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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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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Shtessel, Y. (author), Glumineau, A. (author), Plestan, F. (author), Weiss, M. (author)A perturbed nonlinear system of relative degree two controlled by output feedbacks discontinuous-hybrid-impulsive control is studied. The output hybrid-impulsive terms serve to drive instantaneously the system's trajectory to the origin or to its small vicinity. The output feedback impulsive action combined with the output relay feedback control...conference paper 2014
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Witvoet, G. (author), de Breeje, R. (author), Nijenhuis, J.R. (author), Hazelebach, R.L.M. (author), Doelman, N.J. (author)Segmented primary mirror telescopes require dedicated piston-tip-tilt actuators for optimal optical performance. TNO has developed various prototypes of such actuators, in particular for the E-ELT. In this paper the control results of a specific two-stage prototype will be presented.conference paper 2014
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Shri, A. (author), Popovic, J. (author), Ferreira, J.A. (author), Gerber, M.B. (author)This paper proposes the use of a three-phase four-leg (3P4L) converter in combination with an LCL filter for the inverter stage of a solid state transformer (SST). This configuration gives full control over the line-to-line, as well as the line-to-neutral voltage and currents, while providing exceptional harmonics mitigation. A procedure to...conference paper 2013
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Trottemant, E.J. (author), Vermeulen, A. (author), Weiss, M. (author), TNO Defensie en Veiligheid (author)New developments and improvements on evasive missiles have led to a situation in which the current missile guidance laws have difficulties to intercept maneuvering targets. The nature of the interception problem with 2 non-cooperative players leads to the field of differential games. Recent studies have focused on the so-called zero-sum Nash...conference paper 2007
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Wesselink, J.M. (author), Berkhoff, A.P. (author)This paper discusses the influence of the reconstruction and anti-aliasing filters on the performance of a digital implementation of a Wiener filter for active noise control. The overall impact will be studied in combination with a multi-rate system approach. A reconstruction and anti-aliasing filter will be selected and its parameters will be...conference paper 2006
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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
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TNO Technische Menskunde (author), Steeneken, H.J.M. (author), Verhave, J.A. (author)Active noise reduction is a successful addition to passive ear-defenders for improvement of the sound attenuation at low frequencies. Design and assessment methods are discussed, focused on subjective and objective attenuation measurements, stability, and high noise level applications. Active noise reduction systems are suitable for integration...article 2004
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den Hartog, E.A. (author), Heus, R. (author), TNO Technische Menskunde (author)The requirements to maintain a positive pressure with respiratory protection during heavy exercise and the effects on ventilation and feelings of discomfort were investigated. Eight male subjects participated, using the respirator system during rest and exercise at about 80% of their individual maximum power. A blower was used at maximum and...article 2003
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Fraanje, P.R. (author), Verhaegen, M. (author), Doelman, N.J. (author), Berkhoff, A.P. (author)Adaptive Active Control algorithms, such as the well known Filtered-X LMS and Filtered-U LMS algorithms, often do not yield optimal performance in practise, due to finite length impulse response of the controller (Filtered-X) or convergence to a local minimum (Filtered-U). In addition, especially for the MIMO case, these adaptive controllers...conference paper 2002
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TNO Industrie en Techniek (author), Heemels, W.P.M.H. (author), Gorter, R.J.A. (author), van den Bosch, P.P.J. (author), Weiland, S. (author), Hendrix, W.H.A. (author)The design of controllers for the synchronization of a master and slave motor in a mailing system is addressed. Two approaches to the corresponding hybrid control problem consisting of a continuous-time plant and a discrete-event sensor are discussed. Both methods have been tested successfully on an experiment set-up consisting of a master motor...conference paper 2001
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