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Atmaca, D. (author), Pontani, Mauro (author)This research describes a near-optimal feedback guidance, based on nonlinear orbit control, for low-thrust Earth orbit transfers. Lyapunov stability theory leads to proving that although several equilibria exist, only the desired operational conditions are associated with a stable equilibrium. This ensures quasi-global asymptotic convergence...journal article 2024
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Atif, Muhammad (author), Wang, Xibin (author), Xie, Lijing (author), Giasin, Khaled (author), Ma, Yuan (author), Jiang, Chulin (author), Koklu, Ugur (author), Sinke, J. (author)This study aims to evaluate the effectiveness of Ultrasonic-assisted drilling (UAD) of Glass laminate aluminium reinforced epoxy (GLARE) at high cutting speeds (Spindle speeds: 3000–7500 rpm; feed rates 300–750 mm/min) by analysing the thrust force and hole quality metrics (surface roughness, hole size, and burr formations. The research also...journal article 2024
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Atmaca, D. (author), Pontani, Mauro (author)This research proposes a near-optimal feedback guidance based on nonlinear control for low-thrust Earth orbit transfers. For the numerical simulations, two flight conditions are defined: (i) nominal conditions and (ii) nonnominal conditions that account for the orbit injection errors and the stochastic failures of the propulsion system....conference paper 2023
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Lovell-Prescod, Gervase H.L.H. (author), Ma, Z. (author), Smeur, E.J.J. (author)Tailsitter Micro Air Vehicles with two rotors are promising due to their simplicity and efficient forward flight, but actuator saturation due to ineffective pitch control at a high angle of attack flight is a challenge limiting the flight envelope. This paper proposes a novel tilt-rotor tailsitter design which features two tilting rotors as...conference paper 2023
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Gonzalez Silva, J. (author), Ferrari, Riccardo M.G. (author), van Wingerden, J.W. (author)As renewable energy sources such as wind farms become dominant, new challenges emerge for operating and controlling them. Traditionally, wind farm control aims to dispatch power set-points to individual turbines to maximize energy extraction and, thus, their usage as assets. Yet, grid balance and frequency support are fundamental in presence...journal article 2023
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Hoogreef, M.F.M. (author), Soikkeli, Johannes S.E. (author)Differential thrust can be used for directional control on distributed electric propulsion aircraft. This paper presents an assessment of flight dynamics and control under engine inoperative conditions at minimum control speed for a typical distributed propulsion aircraft employing differential thrust. A methodology consisting of an...journal article 2022
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Giasin, Khaled (author), Atif, Muhammad (author), Ma, Yuan (author), Jiang, Chulin (author), Koklu, Ugur (author), Sinke, J. (author)GLARE laminates are multi-layered metal-composite materials created from bonding sheets of metallic alloys with carbon or glass fibre layers. The application of hybrid-conventional machining processes such as ultrasonic-assisted drilling (UAD) is becoming of great interest to the aerospace industry due to its capability in reducing the...journal article 2022
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Kerstens, Fabio (author), Cervone, A. (author), Gradl, P.R. (author)High performance liquid rocket engines require cooling to maintain structural integrity of the combustion chamber which is exposed to high thermal and environmental loads. For many systems, this is achieved by means of regenerative cooling, where a coolant flows through passages around the chamber wall whilst extracting heat from the wall. A...journal article 2021
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Nijssen, J.P.A. (author), Faludi, Jeremy (author), van Ostayen, R.A.J. (author)Water lubricated bearings have been named in literature as a sustainable alternative to their oil-based counterparts. In order to clarify when water lubricated bearings are or are not a sustainable alternative, and inform design decisions, an analytical design tool is introduced based on anticipatory Life Cycle Assessment (LCA). This model is...journal article 2021
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Jimenez-Lluva, David (author), Root, B.C. (author)Despite the ongoing advancements in low-thrust propulsion technology and the rise of all-electric satellite platforms, low-thrust spacecraft trajectory optimization remains a complex field of research. Shape-based approximations are predominant in interplanetary applications, but they are generally unsuitable for many-revolution trajectories,...journal article 2020
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Giasin, K. (author), Hawxwell, J. (author), Sinke, J. (author), Dhakal, H. (author), Köklü, U. (author), Brousseau, E. (author)Fibre metal laminates (FMLs) are multilayered metal composite materials currently used in aeronautical structures, especially where fatigue and impact resistance are required. FMLs are produced in large panels and often require assembly using the drilling process for riveting purposes. Hole making is a critical machining process in the...journal article 2020
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Haseltalab, A. (author), Garofano, V. (author), van Pampus, Maurits (author), Negenborn, R.R. (author)The maneuvering control of autonomous vessels has been under extensive investigations by academic and industrial communities since it is one of the primary steps towards enabling unmanned shipping. In this paper, a model predictive control (MPC) approach is presented for trajectory tracking control of vessels which takes into account the...journal article 2020
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Sun, Junzi (author), Hoekstra, J.M. (author), Ellerbroek, Joost (author)Air traffic simulations serve as common practice to evaluate different concepts and methods for air transportation studies. The aircraft performance model is a key element that supports these simulation-based studies. It is also an important component for simulation-independent studies, such as air traffic optimization and prediction studies....journal article 2020
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Sun, Junzi (author)A large number of stakeholders exist in the modern air traffic management ecosystem. Air transportation studies benefit from collaboration and the sharing of knowledge and findings between these different players. However, not all parties have equal access to information. Due to the lack of open-source tools and models, it is not always possible...doctoral thesis 2019
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Malgoezar, A.M.N. (author), Vieira, A.E. (author), Snellen, M. (author), Simons, D.G. (author), Veldhuis, L.L.M. (author)Ducted propellers are an interesting design choice for unmanned aerial vehicle (UAV) concepts due to a potential increase of the propeller efficiency. In such designs, it is commonly assumed that introducing the duct also results in an overall noise reduction. The objective of this work is to experimentally analyze and quantify noise of a...review 2019
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Mittempergher, Silvia (author), Succo, Andrea (author), Bistacchi, Andrea (author), Storti, Fabrizio (author), Bruna, P.B.R. (author), Meda, Marco (author)The sedimentary succession exposed in the Northern Dalmatia Islands mainly consists of Cretaceous to Neogene shallow water carbonates, folded and imbricated within the External Dinarides thrust belt. During Cretaceous times, carbonate sediments were deposed on a heterogeneous, tectonically-influenced carbonate platform, which was then uplifted...review 2019
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Silva, Joao Paulo (author), de Wagter, C. (author), de Croon, G.C.H.E. (author)This paper proposes a trajectory planning and control strategy to optimally visit a given set of waypoints in the presence of wind. First, aerodynamic properties of quadrotors which affect trajectory planning and tracking performance are investigated. Blade flapping, induced and parasitic drag are derived and an extended method to identify all...journal article 2017
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Machin Llanos, Jorge (author), Bouwmeester, J. (author)There are several benefits of using autonomous sensors in spacecraft. Avoidance of wired connections reduces cost, mass, and increases the flexibility and reliability of the system. The impact of wire reduction can be significant, especially for small satellites with many sensors, like temperature and sun sensors. Previous research has already...conference paper 2017
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Heiligers, M.J. (author), van den Oever, Tom (author), Ceriotti, M. (author), Mulligan, P. (author), McInnes, CR (author)A pole-sitter is a satellite that is stationed along the polar axis of the Earth, or any other planet, to generate a continuous, hemispherical view of the planet’s polar regions. In order to maintain such a vantage point, a low-thrust propulsion system is required to counterbalance the gravitational attraction of the planet and the Sun. Previous...conference paper 2017
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- Rijkens, A.A.K. (author) doctoral thesis 2016
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