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Abdul Rozak Rivai Fassah, Abdul (author), Mkhoyan, T. (author), de Visser, C.C. (author)
The developments in the field of aerospace materials and structures allow the more light weight air vehicles. However, the aircraft body, particularly wing, can deform more appreciably due to the occurrence of flow separation and flutter. Therefore, active control is necessary in order to maintain structural integrity. One of the proposed...
conference paper 2021
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Proesmans, P. (author), Vos, Roelof (author)
This paper presents a method to assess the key performance indicators of aircraft designed for minimum direct operating cost and aircraft designed for minimum global-warming impact. The method comprises a multidisciplinary aircraft optimization algorithm capable of changing wing, engine and mission design variables while including constraints on...
conference paper 2021
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Bölk, S.A. (author), de Vries, R. (author), van Arnhem, N. (author), Veldhuis, L.L.M. (author)
In this study, unsteady RANS simulations are performed to investigate the effect of over-the-wing (OTW) propeller inclination on the aerodynamic interaction with a wing featuring a plain flap. A comparison to experimental data shows that the numerical approach is capable of modeling the wing and propeller separately and can capture the effect of...
conference paper 2021
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Reitsma, J.P. (author), van Paassen, M.M. (author), Borst, C. (author), Mulder, Max (author)
In-flight non-normal events can be rather taxing for a flight crew. Numerous tasks, often competing for attention, need to be handled adequately after which, the best plan of action for the remainder of the flight needs to be determined. In the light of recent developments towards reduced crew operations, the demand for reducing workload has...
conference paper 2021
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Zoppini, G. (author), Ragni, D. (author), Kotsonis, M. (author)
An experimental parametric study of the effect of discrete roughness elements (DRE) on the development and breakdown of stationary crossflow instability on a swept wing is presented. A systematic investigation of the receptivity to various elements height and chord locations is carried out in a crossflow dominated flow. The flow is globally and...
conference paper 2021
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Casacuberta Puig, J. (author), Hickel, S. (author), Kotsonis, M. (author)
We study the interaction between a stationary crossflow instability and forward-facing steps in a swept-wing boundary layer using Direct Numerical Simulations (DNS). The station- ary primary crossflow mode is imposed at the inflow. Steps of several heights are modeled. Particular emphasis is placed on ensuring a fully stationary solution, in...
conference paper 2021
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Mkhoyan, T. (author), de Visser, C.C. (author), De Breuker, R. (author)
Advancements in aircraft controllers and the tendency towards increasingly lighter and more flexible aircraft designs create the need for adaptive and intelligent control systems. While lighter aircraft structures have the potential to show better structural and aerodynamic efficiency, they are also more susceptible to dynamic loads. A key...
conference paper 2021
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Vrouwenvelder, S.C.F. (author), Postema, F.N. (author), Pool, D.M. (author)
This paper presents a novel methodology for measuring the drag latency of touchscreens. Drag latency is a characteristic of touch hardware that can affect key metrics of human performance as typically collected in human-in-the-loop (simulator) experiments. The proposed methodology uses a laser and laser sensor to obtain an external measurement...
conference paper 2021
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van Baelen, D. (author), van Paassen, M.M. (author), Ellerbroek, J. (author), Abbink, D.A. (author), Mulder, Max (author)
Modern aircraft use a variety of fly-by-wire control devices and combine these with a flight envelope protection system to limit pilot control inputs when approaching the aircraft limits. The current research project aims to increase pilot awareness of such a protection system through the use of force feedback on the control device, i.e.,...
conference paper 2021
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van Ingen, J.B. (author), de Visser, C.C. (author), Pool, D.M. (author)
Since 2019, a key element of simulator-based training of airline pilots is stall training. A major and still largely open research question is which level of model fidelity is required for effective training. As part of an effort to answer this question, a model of the quasi-steady stall dynamics of a Cessna Citation II aircraft is identified...
conference paper 2021
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Mkhoyan, T. (author), Thakrar, N.R. (author), De Breuker, R. (author), Sodja, J. (author)
In this study, the design and development of an autonomous morphing wing concept were investigated. The morphing wing was developed in the scope of the Smart-X project, aiming to demonstrate in-flight performance optimisation. This study proposed a novel distributed morphing concept, with six Translation Induced Camber (TRIC) morphing trailing...
conference paper 2021
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Wang, Xuerui (author), Mkhoyan, T. (author), De Breuker, R. (author)
This paper proposes a nonlinear control architecture for flexible aircraft simultaneous trajectory tracking and load alleviation. By exploiting the control redundancy, the gust and maneuver loads are alleviated without degrading the rigid-body command tracking performance. The proposed control architecture contains four cascaded control loops:...
conference paper 2021
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de Alvear Cardenas, J.I. (author), Sun, B. (author), van Kampen, E. (author)
Linear Approximate Dynamic Programming (LADP) and Incremental Approximate Dynamic Programming (IADP) are Reinforcement Learning methods that seek to contribute to the field of Adaptive Flight Control. This paper assesses their performance and convergence, as well as the impact of sensor noise on policy convergence, online system...
conference paper 2021
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Mertens, C. (author), van Oudheusden, B.W. (author), Sodja, J. (author), Sciacchitano, A. (author), van Oudheusden, B.W. (author)
The three components in Collar’s triangle of forces (aerodynamic, elastic and inertial) acting on a flexible wing are determined, based on integrated optical measurements of the structural and the aerodynamic response to steady and unsteady periodic inflow conditions. The measurement device is a coaxial volumetric velocimeter mounted on a...
conference paper 2021
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Marschalk, S. (author), Luteijn, P.C. (author), van Os, D. (author), Pool, D.M. (author), de Visser, C.C. (author)
As of April 2019, upset prevention and recovery training in flight simulation training devices is a mandatory practice for commercial and civil aircraft pilots. Aircraft stalls are a well-known upset type, therefore simulation of aircraft stall behavior is required. A key characteristic of stalls is the stall buffet, which in current stall...
conference paper 2021
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Cain, Sebastian (author), Torens, Christoph (author), Juchmann, Patrick (author), Volkert, Andreas (author), Tomasello, Filippo (author), Natale, Matteo (author), Vreeken, Joost (author), Ribeiro, M.J. (author), Ellerbroek, J. (author)
Unmanned aircraft systems (UAS) have been in civil use for several years. A new risk-based approach to approval was developed by the Joint Authorities for Rulemaking of Unmanned Systems (JARUS) which relies on the so-called Specific Operations Risk Assessment (SORA) for the specific category. Operational authorization is based on the assessment...
conference paper 2021
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Lee, J.H. (author), van Kampen, E. (author)
Reinforcement learning is used as a type of adaptive flight control. Adaptive Critic Design (ACD) is a popular approach for online reinforcement learning control due to its explicit generalization of the policy evaluation and the policy improvement elements. A variant of ACD, Incremental Dual Heuristic Programming (IDHP) has previously been...
conference paper 2021
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Dominguez Calabuig, G.J. (author), Mooij, E. (author)
Space safety and hazard-reduction techniques for space-transportation vehicles are becoming critical in the advent of commercial crewed launches and suborbital intercontinental travel. One way to mitigate risks is to use advanced guidance strategies to centralise mission planning, and guidance, navigation and control. Convex optimisation can be...
conference paper 2021
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Shayan, K. (author), van Kampen, E. (author)
Conventional discrete reinforcement learning methods fail in providing satisfactory performance for online Flight Control Systems (FCSs). The lack of efficiency of the discrete controller in exploration for finding the optimal policy, the so-called problem of ’curse of dimensionality’, results in an approach that is not suitable for online...
conference paper 2021
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van Empelen, S.A. (author), Vos, Roelof (author)
Space safety and hazard-reduction techniques for space-transportation vehicles are becoming critical in the advent of commercial crewed launches and suborbital intercontinental travel. One way to mitigate risks is to use advanced guidance strategies to centralise mission planning, and guidance, navigation and control. Convex optimisation can be...
conference paper 2021
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