- document
-
Başkaya, A.O. (author), Hickel, S. (author), Dungan, Sean (author), Brehm, Christoph (author)Direct numerical simulations (DNS) are performed over 15° compression ramp undergoing ablation at Mach 8 to examine fluid-ablation interactions (FAI) on transitional high-speed boundary layers. The experiments at these conditions with a rigid wall are first numerically replicated for a laminar flow. Heating streaks are introduced by perturbing...conference paper 2024
- document
-
van Campen, J.M.J.F. (author)In 2022 Airbus and Boeing combined delivered 1203 commercial aircraft. With an annual predicted growth of 4.3% for the coming 20 years there is an urgent need for end of life solutions that go beyond down-cycling of parts that cannot be reused. Especially carbon fibre reinforced composites are hard to recycle, and attempts to deliver recyclable...conference paper 2024
- document
-
Gavra, V. (author), van Kampen, E. (author)Recent research in artificial intelligence potentially provides solutions to the challenging problem of fault-tolerant and robust flight control. The current work proposes a novel Safety-informed Evolutionary Reinforcement Learning (SERL) algorithm, which combines Deep Reinforcement Learning (DRL) and neuro-evolution to optimize a population of...conference paper 2024
- document
-
de Vries, R. (author), Wolleswinkel, Rob E. (author), Hoogreef, M.F.M. (author), Vos, Roelof (author)Battery-electric aviation is commonly believed to be limited to small aircraft and is therefore expected have a negligible impact on the decarbonization of the aviation sector. In this paper we argue that, with the correct choice of design parameters and top-level aircraft requirements, the addressable market is actually substantial. To...conference paper 2024
- document
-
Wolleswinkel, Rob E. (author), de Vries, R. (author), Hoogreef, M.F.M. (author), Vos, Roelof (author)Thus far, battery-electric propulsion has not been considered a promising pathway to climate-neutral aviation. Given current and expected battery technology, in most literature battery-electric aircraft are only considered feasible for short ranges (< 400 km) and small payloads (< 19 pax). As a result, battery-electric aircraft development...conference paper 2024
- document
-
Joksimović, Aleksandar (author), Carbonneau, Xavier (author), Brazier, F.M. (author), Vingerhoeds, Rob (author)This paper presents a simple explanatory framework to analyse the diverse strategies proposed by the civil aviation sector in attempts to reconcile its growth tendencies with its impact on natural environment. Despite framing the industry as a single entity that has a problem to solve, it is better represented as a diverse set of actors, each...conference paper 2024
- document
-
Joksimović, Aleksandar (author), Brazier, F.M. (author), Carbonneau, Xavier (author), Vingerhoeds, Rob (author)An overwhelming abundance of innovative civil aeroplane concepts has been presented by the research community in recent decades. Their development has been motivated mainly by need for better operating energy, or in particular the fuel efficiency - the common objective variable for economic and environmental optimisation. This paper focuses on...conference paper 2024
- document
-
Joksimović, Aleksandar (author), Carbonneau, Xavier (author), Brazier, F.M. (author), Vingerhoeds, Rob (author)This paper presents development of an innovative method for aeroplane system architecture design, based on the principles of causal networks. In light of the environmental crisis that the world faces, it is argued that the new design method should be motivated by sustainability values in the first place. This implies the necessity for a method...conference paper 2024
- document
-
Velázquez Navarro, Ester (author), Solano-López, Pablo (author), Uriol Balbin, I. (author)The demand for pressurized, large structures in space, such as habitats or fuel deposits, is increasing as the space industry grows. The limited payload volume of launch vehicles, combined with their highly constrained shape, presents a significant challenge for these structures. Origami-inspired deployable structures have emerged as a potential...conference paper 2024
- document
-
Spinellis, D. (author)RDBUnit is a unit testing framework designed to test relational database queries, created out of a need for unit testing them while working on software analytics tasks. It is available as a Python package on PyPI and open-source software on GitHub. RDBUnit tests consist of three parts: setup, query, and expected result, with the input and...journal article 2024
- document
-
Ali Mubarak, Faisal (author), Mascolo, V. (author), Hussain, Faizan (author), Rietveld, Gert (author)Closed-form solutions are presented for calculating the reflection coefficient with corresponding uncertainty of metrology-grade 3.5 mm air-dielectric coaxial transmission lines for use as reference standards in S-parameter measurements up to 33 GHz. The closed-form solutions allow the calculation of the sensitivity coefficients required for...journal article 2024
- document
-
Dash, T.K. (author), Driessen, J.N. (author), Krasnov, O.A. (author), Yarovoy, Alexander (author)The problem of the limited accuracy of precipitation Doppler spectrum moments estimation measured by fast azimuthally scanning weather radars is addressed. A novel approach for the Doppler moment estimation based on maximum likelihood estimation is proposed. A simplified semianalytical parametric model for the precipitation power spectral...journal article 2024
- document
-
Konte, Maty (author), Ndubuisi, G.O. (author)We explore the heterogeneous effect of migrant remittances on citizens' support for taxation using a sample comprising 45,000 individuals from the Afrobarometer survey round 7 [2016–2018] across 34 African countries. To correct for unobserved heterogeneity, we endogenously identify latent classes/subtypes of individuals that share similar...journal article 2024
- document
-
Rotundo, C.D. (author), Sinnige, T. (author), Sodja, J. (author)A tightly coupled aeroelastic design code for composite propeller blades was developed, verified, and used to perform design sensitivity studies. The design code features a structural model that accounts for geometric nonlinearities through the application of a corotational framework, nonlinear responses to loads, and a cross-sectional modelling...conference paper 2024
- document
-
Çavdar, I. (author), Mooij, E. (author)Within the last decade, the use of launch vehicles has increased as private companies have emerged in the space exploration industry. Compared to the early 1980s, the market for launch vehicles has become significantly more competitive, introducing the desire to have fully reusable launch vehicles. The true benefits of fully reusable launch...conference paper 2024
- document
-
Rius Vidales, A.F. (author), Barahona Lopez, M. (author), Kotsonis, M. (author)A new experimental facility named Swept Transition Experimental Platform (STEP) has been designed and built for detailed studies of crossflow instability and its interaction with surface irregularities and varying wall temperature conditions. The STEP is designed for use in the anechoic low-turbulence wind tunnel facility at the Delft University...conference paper 2024
- document
-
Agante de Carvalho, J.R. (author), Mooij, E. (author)This research performs a surrogate-assisted shape optimisation of hypersonic waveriders, where the trajectories of each shape are optimised with a multi-objective evolutionary algorithm for heat-load and cross-range. A study on the best evolutionary algorithm, node control strategy for angle of attack and bank angle profiles, and population size...conference paper 2024
- document
-
Mooij, E. (author), Root, B.C. (author)With the increasing interest in the Solar System's smaller bodies, quite a few missions have been sent to comets and asteroids, and more will be send in the near future. Due to the large distances involved, communication to command mission parameters takes a long time, which has a negative impact on operational safety. Autonomous navigation...conference paper 2024
- document
-
Carrillo Córcoles, X. (author), De Breuker, R. (author), Sodja, J. (author)This study explores the implementation of aeroelastic tailoring in the design of a regional aircraft featuring a strut-braced wing (SBW). Making use of the aeroelastic optimisation framework from Delft University of Technology, PROTEUS, the research addresses two distinct cases. The first case involves a simplified SBW geometry to validate the...conference paper 2024
- document
-
Maathuis, H.F. (author), De Breuker, R. (author), Castro, Saullo G.P. (author)Design optimisation potentially leads to lightweight aircraft structures with lower environmental impact. Due to the high number of design variables and constraints, these problems are ordinarily solved using gradient-based optimisation methods, leading to a local solution in the design space while the global space is neglected. Bayesian...conference paper 2024