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Tol, H.J. (author), de Visser, C.C. (author), Kotsonis, M. (author)This paper presents a study on control of fluid flows using multivariate spline reduced order models. A new approach is presented for model reduction of the incompressible Navier-Stokes equations using multivariate splines defined on triangulations. State space descriptions are derived that can be used for control design. This paper considers...conference paper 2016
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- Tang, D (author), Pool, D.M. (author), Stroosma, O. (author), Chu, Q. P. (author), de Visser, C.C. (author) conference paper 2016
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- Mannucci, T. (author), van Kampen, E. (author), de Visser, C.C. (author), Chu, Q. P. (author) conference paper 2016
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de Visser, C.C. (author), Brunner, A.E. (author), Verhaegen, M.H.G. (author)The distributed-spline-based aberration reconstruction (D-SABRE) method is proposed for distributed wavefront reconstruction with applications to large-scale adaptive optics systems. D-SABRE decomposes the wavefront sensor domain into any number of partitions and solves a local wavefront reconstruction problem on each partition using...journal article 2016
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- Lu, P. (author), van Eykeren, L. (author), van Kampen, E. (author), de Visser, C.C. (author), Chu, Q. P. (author) journal article 2016
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- Jenie, Y.I. (author), van Kampen, E. (author), de Visser, C.C. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author) conference paper 2016
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- Stapel, J (author), de Visser, C.C. (author), van Kampen, E. (author), Chu, Q. P. (author) conference paper 2016
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- Zhang, Y. (author), de Visser, C.C. (author), Chu, Q. P. (author) conference paper 2016
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Tol, H.J. (author), de Visser, C.C. (author), Kotsonis, M. (author)A new methodology is presented for model reduction of linear parabolic partial differential equations (PDEs) on general geometries using multivariate splines on triangulations. State-space descriptions are derived that can be used for control design. This method uses Galerkin projection with B-splines to derive a finite set of ordinary...journal article 2016
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Helsen, R (author), van Kampen, E. (author), de Visser, C.C. (author), Chu, Q. P. (author)In this research, the concept of posing the flight envelope as a reachable set is ex- plored further and it is investigated whether the "Distance Fields Over Grids (DFOG)" method for reachability computations is a viable method for envelope determination. The DFOG method approximates the reachable set of a dynamic system by solving a number of...journal article 2016
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- Zhang, Y. (author), de Visser, C.C. (author), Chu, Q. P. (author) conference paper 2016
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Jenie, Y.I. (author), van Kampen, E. (author), de Visser, C.C. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)This paper proposes a novel avoidance method called the three-dimensional velocity obstacle method. The method is designed for unmanned aerial vehicle applications, in particular to autonomously handle uncoordinated multiple encounters in an integrated airspace, by exploiting the limited space in a three-dimensional manner. The method is a three...journal article 2016
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Lu, P. (author), van Kampen, E. (author), de Visser, C.C. (author), Chu, Q. P. (author)This paper deals with aircraft trajectory control in the presence of model uncertainties and actuator faults. Existing approaches, such as adaptive backstepping and nonlinear dynamic inversion with online model identi_cation, can be applied. However, since there are a number of unknown aerodynamic derivatives, the tuning of parameter update law...journal article 2016
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Lu, P. (author), van Kampen, E. (author), de Visser, C.C. (author), Chu, Q. P. (author)The design of unknown-input decoupled observers and lters requires the assumption of an existence condition in the literature.This paper addresses an unknown input ltering problem where the existence condition is not satised. Instead of designing a traditional unknown input decoupled lter, a Double-Model Adaptive Estimation approach is extended...journal article 2016
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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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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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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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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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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