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De Visser, Hylke (author), Arkesteijn, M.H. (author), Binnekamp, R. (author), de Graaf, R.P. (author)Purpose–Alignment of corporate real estate to a corporation’s business strategy is a long-standing issue. In the past multiple models have been developed to support this process, but research shows that they fall short on certain parts of the CRE alignment activity, often lack transparency and fail to choose the real estate strategy that...abstract 2017
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De Visser, Hylke (author), Arkesteijn, M.H. (author), Binnekamp, R. (author), de Graaf, R.P. (author)Purpose –Alignment of corporate real estate to a corporation’s business strategy is a long-standing issue. In the past multiple models have been developed to support this process, but research shows that they fall short on certain parts of the CRE alignment activity, often lack transparency and fail to choose the real estate strategy that...conference paper 2017
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Jenie, Y.I. (author), Van Kampen, E.J. (author), De Visser, C.C. (author), Ellerbroek, J. (author), Hoekstra, J.M. (author)Autonomous systems are required in order to enable UAVs to conduct self-separation and collision avoidance, especially for flights within the civil airspace system. A method called the Velocity Obstacle Method can provide the necessary situational awareness for UAVs in a dynamic environment, and can help to generate a deconflicting maneuver.This...conference paper 2015
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Caetano, J.V. (author), Weehuizen, M.B. (author), De Visser, C.C. (author), De Croon, G.C.H.E. (author), Mulder, M. (author)Several formulations have been proposed to model the dynamics of ornithopters, with inconclusive results regarding the need for complex kinematic formulations. Furthermore, the impact of assumptions made in the collected results was never assessed by comparing simulations with real flight data. In this study two dynamic models of a Flapping Wing...journal article 2015
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Visser, T. (author), De Visser, C.C. (author), Van Kampen, E.J. (author)A novel method for aircraft system identification is presented that is based on a new multivariate spline type; the multivariate multiplex B-spline. The multivariate multiplex B-spline is a generalization of the recently introduced tensor-simplex B-spline. Multivariate multiplex splines obtain similar or better approximation accuracy using less...conference paper 2015
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De Visser, M.M. (author), Kanning, W. (author), Koopmans, R. (author), Niemeijer, J. (author)Research to the failure mechanism piping (internal, backward erosion) in the Netherlands shows that the dikes require costly berms to meet the required safety standards. According to the Sellmeijer piping-formula, the d70 (70%-quantile of the grain size distribution by weight) is an important parameter in the resistance against piping. Therefore...conference paper 2015
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Jatiningrum, D. (author), De Visser, C.C. (author), Van Paassen, M.M. (author), Mulder, M. (author)With the role of angular accelerometers in future fault-tolerant flight control systems, an in-depth evaluation of their performance then becomes a critical issue from the perspective of control system design. In this paper, a position-based calibration table is utilized to provide a sufficiently accurate angular acceleration reference in the...conference paper 2015
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De Visser, P.J. (author), Yates, S.J.C. (author), Guruswamy, T. (author), Goldie, D.J. (author), Withington, S. (author), Neto, A. (author), Llombart, N. (author), Baryshev, A.M. (author), Klapwijk, T.M. (author), Baselmans, J.J.A. (author)We have measured the absorption of terahertz radiation in a BCS superconductor over a broad range of frequencies from 200 GHz to 1.1 THz, using a broadband antenna-lens system and a tantalum microwave resonator. From low frequencies, the response of the resonator rises rapidly to a maximum at the gap edge of the superconductor. From there on,...journal article 2015
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Orlova, E.E. (author), Hovenier, J.N. (author), De Visser, P.J. (author), Gao, J.R. (author)We demonstrate the formation of a narrow beam from a long (L??) laser with subwavelength transverse dimensions (wire laser) as an image of the subwavelength laser waveguide formed by a spherical lens. The beam is linearly diverging with the angle determined by the ratio of the wavelength to the lens radius, while the minimum beam spot size is...journal article 2015
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Tol, H.J. (author), De Visser, C.C. (author), Van Kampen, E.J. (author), Chu, Q.P. (author)This paper presents a study on fault tolerant flight control of a high performance aircraft using multivariate splines. The controller is implemented by making use of spline model based adaptive nonlinear dynamic inversion (NDI). This method, indicated as SANDI, combines NDI control with nonlinear control allocation based on an onboard...conference paper 2015
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Govindarajan, N. (author), De Visser, C.C. (author), Krishnakumar, K. (author)This paper presents a sparse collocation method for solving the time-dependent Hamilton–Jacobi–Bellman (HJB) equation associated with the continuous-time optimal control problem on a fixed, finite timehorizon with integral cost functional. Through casting the problem in a recursive framework using the value iteration procedure, the value...journal article 2014
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Armanini, S.F. (author), Verboom, J.L. (author), De Croon, G.C.H.E. (author), De Visser, C.C. (author)This paper presents the results of a series of flight tests conducted in order to assess the steady-state flight characteristics and basic control behaviour of the DelFly, a flapping-wing micro aerial vehicle (FWMAV). Flights were conducted in an indoor motion tracking facility and included steady-level flight at a range of different velocities...conference paper 2014
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Armanini, S.F. (author), Verboom, J.L. (author), De Croon, G.C.H.E. (author), De Visser, C.C. (author)This paper presents the results of a series of flight tests conducted in order to assess the steady-state flight characteristics and basic control behaviour of the DelFly, a flapping-wing micro aerial vehicle (FWMAV). Flights were conducted in an indoor motion tracking facility and included steady-level flight at a range of different velocities...conference paper 2014
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Govindarjan, N. (author), De Visser, C.C. (author), Van Kampen, E. (author), Krishnakumar, K. (author), Barlow, J. (author), Stepanyan, V. (author)This paper presents an optimal control framework to determine a collection of open-loop command signals that mathematically guarantees operation of an aircraft within certain prescribed state constraints. The framework is specifically applied to estimate margins for the reference command inputs of aircraft autopilot systems, so that safe...journal article 2014
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Tol, H.J. (author), De Visser, C.C. (author), Van Kampen, E. (author), Chu, Q.P. (author)High performance flight control systems based on the nonlinear dynamic inversion (NDI) principle require highly accurate models of aircraft aerodynamics. In general, the accuracy of the internal model determines to what degree the system nonlinearities can be canceled; the more accurate the model, the better the cancellation, and with that, the...journal article 2014
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De Visser, P.J. (author)This thesis describes the intrinsic limits of superconducting microresonator detectors. In a superconductor at low temperature, most of the electrons are paired into so called Cooper pairs, which cause the well-known electrical conduction without resistance. Superconducting microwave resonators have therefore very high quality factors and are...doctoral thesis 2014
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De Visser, P.J. (author), Baselmans, J.J.A. (author), Bueno, J. (author), Llombart, N. (author), Klapwijk, T.M. (author)In a superconductor, in which electrons are paired, the density of unpaired electrons should become zero when approaching zero temperature. Therefore, radiation detectors based on breaking of pairs promise supreme sensitivity, which we demonstrate using an aluminium superconducting microwave resonator. Here we show that the resonator also...journal article 2014
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De Visser, P.J. (author), Goldie, D.J. (author), Diener, P. (author), Withington, S. (author), Baselmans, J.J.A. (author), Klapwijk, T.M. (author)In a superconductor, absorption of photons with an energy below the superconducting gap leads to redistribution of quasiparticles over energy and thus induces a strong nonequilibrium quasiparticle energy distribution. We have measured the electrodynamic response, quality factor, and resonant frequency of a superconducting aluminium microwave...journal article 2014
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Sun, L.G. (author), De Visser, C.C. (author), Chu, Q.P. (author), Falkena, W. (author)Recently, an incremental type sensor based backstepping (SBB) control approach, based on singular perturbation theory and Tikhonov’s theorem, has been proposed. This Lyapunov function based method uses measurements of control variables and less model knowledge, and it is not susceptible to the model uncertainty caused by fault scenarios. In this...journal article 2013
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- Caetano, J.V. (author), Verboom, J. (author), De Visser, C.C. (author), De Croon, G.C.H.E. (author), Remes, B.D.W. (author), De Wagter, C. (author), Mulder, M. (author) conference paper 2013