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View article: An Exact, Finite Dimensional Representation for Full-Block, Circle Criterion Multipliers
An Exact, Finite Dimensional Representation for Full-Block, Circle Criterion Multipliers Open
This paper provides the first finite-dimensional characterization for the complete set of full-block, circle criterion multipliers. We consider the interconnection of a discrete-time, linear time-invariant system in feedback with a non-rep…
View article: Robust Time-Varying Control Barrier Functions with Sector-Bounded Nonlinearities
Robust Time-Varying Control Barrier Functions with Sector-Bounded Nonlinearities Open
This paper presents a novel approach for ensuring safe operation of systems subject to input nonlinearities and time-varying safety constraints. We formulate robust time-varying control barrier functions by combining two ingredients: (i) t…
View article: A robust periodic controller for spacecraft attitude tracking
A robust periodic controller for spacecraft attitude tracking Open
View article: A Robust Periodic Controller for Spacecraft Attitude Tracking
A Robust Periodic Controller for Spacecraft Attitude Tracking Open
This paper presents a novel approach for robust periodic attitude control of satellites. Respecting the periodicity of the satellite dynamics in the synthesis allows to achieve constant performance and robustness requirements over the orbi…
View article: Control Synthesis Along Uncertain Trajectories Using Integral Quadratic Constraints
Control Synthesis Along Uncertain Trajectories Using Integral Quadratic Constraints Open
The paper presents a novel approach to synthesize robust controllers for nonlinear systems along perturbed trajectories. The approach linearizes the system with respect to a reference trajectory. In contrast to existing methods rooted in r…
View article: Finite-Horizon Robustness Analysis under Mixed Disturbances using Signal-IQCs
Finite-Horizon Robustness Analysis under Mixed Disturbances using Signal-IQCs Open
View article: Ergebnisse zum Anfassen: Das interdisziplinäre Entwurfsprojekt Luft- und Raumfahrttechnik
Ergebnisse zum Anfassen: Das interdisziplinäre Entwurfsprojekt Luft- und Raumfahrttechnik Open
Im Rahmen des Interdisziplinären Entwurfsprojektes Luft- und Raumfahrttechnik entwerfen Studierende unbemannte Flugsysteme für Such- und Rettungsaufgaben. Dies umfasst den Vorentwurf (z.B. Aerodynamische Auslegung), Detailentwurf (z.B. Str…
View article: Hands-On Flight Dynamics and Controls Teaching using Flight Simulators
Hands-On Flight Dynamics and Controls Teaching using Flight Simulators Open
View article: Vom Computer in die Luft – Das interdisziplinäre Entwurfsprojekt Luft- und Raumfahrttechnik
Vom Computer in die Luft – Das interdisziplinäre Entwurfsprojekt Luft- und Raumfahrttechnik Open
Im Rahmen des Interdisziplinären Entwurfsprojektes Luft- und Raumfahrttechnik entwerfen Studierende unbemannte Flugsysteme für Such- und Rettungsaufgaben. Dies umfasst den Vorentwurf (z.B. Aerodynamik), Detailentwurf (z.B. Autopilotenentwu…
View article: Robustness Analysis of Nonlinear Systems Along Uncertain Trajectories
Robustness Analysis of Nonlinear Systems Along Uncertain Trajectories Open
The paper presents a novel approach for robustness analysis of nonlinear dynamic systems in the vicinity of a reference trajectory. The approach linearizes the system with respect to a nominal trajectory and calculates a guaranteed upper b…
View article: Flight Control Reconfiguration in Oscillatory Failure Case Scenarios
Flight Control Reconfiguration in Oscillatory Failure Case Scenarios Open
A fault detection system together with a flight control reconfiguration algorithm is proposed to tackle the problem of oscillatory failure case scenarios in hydraulically actuated flight control loops. The fault detection system employs a …
View article: Linear Parameter Varying Controller Design For Satellite Attitude Control*
Linear Parameter Varying Controller Design For Satellite Attitude Control* Open
This paper presents a systematic linear parameter varying (LPV) control approach for the 3-axis attitude control of an Earth-observation satellite in a sun-synchronous orbit. The dynamics of the satellite depend on the orientation of the s…
View article: Finite Horizon Worst-Case Analysis of Linear Time-Varying Systems\n Applied to Launch Vehicle
Finite Horizon Worst-Case Analysis of Linear Time-Varying Systems\n Applied to Launch Vehicle Open
This paper presents an approach to compute the worst-case gain of the\ninterconnection of a finite time horizon linear time-variant system and a\nperturbation. The input/output behavior of the uncertainty is described by\nintegral quadrati…
View article: Finite Horizon Worst-Case Analysis of Linear Time-Varying Systems Applied to Launch Vehicle
Finite Horizon Worst-Case Analysis of Linear Time-Varying Systems Applied to Launch Vehicle Open
This paper presents an approach to compute the worst-case gain of the interconnection of a finite time horizon linear time-variant system and a perturbation. The input/output behavior of the uncertainty is described by integral quadratic c…
View article: Time‐varying robustness analysis of launch vehicles under thrust perturbations
Time‐varying robustness analysis of launch vehicles under thrust perturbations Open
This article presents a robustness analysis for launch vehicles during atmospheric ascent. It is based on recent advances in the worst‐case analysis of uncertain, finite horizon linear time‐varying (LTV) systems. Integral quadratic constra…
View article: Finite Horizon Touchdown Analysis of Autolanded Aircraft under Crosswind
Finite Horizon Touchdown Analysis of Autolanded Aircraft under Crosswind Open
The paper presents a worst-case touchdown condition analysis of an autolanded aircraft under crosswind. Aircraft dynamics are generally considered altitude- and speed-dependent and, thus, well covered inside the linear parameter-varying fr…
View article: Finite Time Horizon Analysis of Launch Vehicles Under Mass and Thrust Uncertainty
Finite Time Horizon Analysis of Launch Vehicles Under Mass and Thrust Uncertainty Open
This paper presents a new approach to include thrust and mass uncertainties in the worst case loads analysis of launch vehicles during the atmospheric ascend. The analysis is based on recent results on the worst case gain computation of un…
View article: Finite Horizon Worst Case Analysis of Launch Vehicles
Finite Horizon Worst Case Analysis of Launch Vehicles Open
This paper presents a robust linear time varying (LTV) analysis of a space launcher. It evaluates the worst case aerodynamic loads during the atmospheric flight phase under wind turbulence. The results of the LTV analysis are evaluated aga…