Browsing by Title

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    2D Maximum lift prediction of a three element airfoil
    (National Aerospace Laboratory NLR, 1998) Cock, K.M.J. de
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    4D ATM cockpit: Set-up and initial evaluation
    (National Aerospace Laboratory NLR, 1996) Hoogeboom, P.J. ; Huisman, H.
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    50-years Dutch helicopter-ship qualification
    (National Aerospace Laboratory NLR, 2016) Booij, P.J.A. ; Vorst, J. van der
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    5th Gen Mission Planning : Integrated Systems and Algorithms
    (Netherlands Aerospace Centre NLR, 2021) Reus, A.J.C. de ; Vlasblom, J.I.D. ; Arents, R.R.D.
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    A challenging high-end data acquisition system in a harsh wind tunnel environment at high rotational speed
    (3AF, 2023) Bardet, S.M. ; Zutphen, W.J.C.M. van ; Fontaine, F.M. ; Faasse, P.R.
    NLR developed an advanced, high-performance data acquisition system for a generic engine test rig. The test rig is intended for wind tunnel use. The RDAS and MDAS subsystems are bespoke developments, supporting a total of 120 rotating and almost 700 stationary measurement channels. All measurements are made under harsh environmental conditions: wide temperature range and high vibration levels. The rotating section tolerates rotation up to 16,000 rpm.
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    A collaborative design method for the aircraft supply chain: multi-level optimization
    (Netherlands Aerospace Centre NLR, 2019) Wit, A.J. de ; Lammen, W.F. ; Timmermans, H.S. ; Vankan, W.J. ; Charbonnier, D. ; Laan, T. van der ; Ciampa, P.D.
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    A Heat Pump for Space Applications
    ( 2015) Gerner, H.J. van ; Donk, G. van ; Pauw, A. ; Es, J. van ; Lapensée, S.
    In commercial communication satellites, waste heat (5-10kW) has to be radiated into space by radiators. These radiators determine the size of the spacecraft, and a further increase in radiator size (and therefore spacecraft size) to increase the heat rejection capacity is not practical. A heat pump can be used to raise the radiator temperature above the temperature of the equipment, which results in a higher heat rejecting capacity without increasing the size of the radiators. A heat pump also provides the opportunity to use East/West radiators, which become almost as effective as North/South radiators when the temperature is elevated to 100°C. The heat pump works with the vapour compression cycle and requires a compressor. However, commercially available compressors have a high mass (40 kg for 10kW cooling capacity), cause excessive vibrations, and are intended for much lower temperatures (maximum 65°C) than what is required for the space heat pump application (100°C). Dedicated aerospace compressors have been developed with a lower mass (19 kg) and for higher temperatures, but these compressors have a lower efficiency. For this reason, an electrically-driven, high-speed (200,000 RPM), centrifugal compressor system has been developed in a project funded by the European Space Agency (ESA). This novel 3-stage compressor system has a mass of just 2 kg and a higher efficiency than existing aerospace compressors. The compressor system has been incorporated in a heat pump demonstrator, which uses isopentane (R601a) as refrigerant. Due to the exposure of isopentane to radiation in a space application, other substances will form. However, a literature study shows that the amounts of the formed substances are so small, that no significant influence on the performance of the heat pump is expected. Tests were carried out with the heat pump, and at the target setting (saturation temperature of 45°C at the evaporator, 100°C at the condenser, and a payload heat input of 5 kW), the measured COP is 2.3, which is higher than the original requirement of 2.
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    A Large-Scale European Union Study of Aircrew Fatigue During Long Night and Disruptive Duties
    (Netherlands Aerospace Centre NLR, 2020) Sallinen, M. ; Dijk, H. van ; Aeschbach, D. ; Maij, A. ; Akerstedt, T.
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    A novel method for automated routing optimisation and equipment positioning in aero engine nacelles
    (Netherlands Aerospace Centre NLR, 2018) Vankan, W.J. ; Maas, R. ; Peyron, V.
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    A Pilot Study on Biobehavioural Measurements on Air Traffic Controllers in Remote Tower Operations
    (National Aerospace Laboratory NLR, 2017) Bos, T.J.J. ; Zon, G.D.R. ; Füredi, E ; Dudas, D ; Rohács, D
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    A Review on Education and Training Needs for Military Space Operations
    (NTSA, 2024) Caso, S. ; Tanis, T.P. ; Kleef, A.J.P. van
    Space is a dynamic and rapidly evolving domain, driven by the increased engagement across the commercial, scientific, governmental and military sectors. Particularly, operations in low Earth orbit (LEO), medium Earth orbit (MEO) and geostationary Earth orbit (GEO) play a vital role in sustaining infrastructures for daily on-Earth activities, e.g., global positioning system (GPS) and 5G. In 2019, a significant milestone was reached with the adoption of NATO’s Space Policy, officially recognizing space as a distinct operational domain alongside land, air, sea and cyberspace. This integration positioned space capabilities as an integral part to military strategies, supplying vital information for secure operations. Due to the growing dependency of space infrastructures, military personnel must be trained to be able to effectively operate space assets and to be prepared for hostile or environmental calamities. This paper conducted a state-of-the-art analysis of military training needs in the realm of space. A literature review was made, encompassing the current scientific literature in space training, with the latest topics from several space agendas outlined by relevant organizations and countries. In addition, interviews were conducted, complemented by surveys, in order to identify the current training gaps and areas for improvement. The findings identified several research gaps and needs related to training and education tools, with a specific emphasis on the Space Situational Awareness (SSA) and Space Traffic Management (STM) topics. These recommendations were particularly addressed to the recognizing and mitigating of potential calamities, a concern heightened by the dense presence of satellites in the Earth's orbit. Additionally, a training gap was identified within the use of satellite images for Intelligence, Surveillance & Reconnaissance (ISR) activities. These activities play a vital role in supporting military operations with their decision-making processes, by improving situational awareness on land, in air, and at sea. Finally, suggestions were made regarding the use of the latest technological tools.
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    A systematic literature review of low-cost 3D mapping solutions
    (Elsevier, 2025) Balado Frias, J. ; Garozzo, R. ; Winiwarter, L. ; Tilon, S.M.
    In "low-cost" solutions, ensuring economic accessibility and democratizing the availability of emerging technologies stand as pivotal considerations. This study undertakes a systematic literature review of low-cost 3D mapping solutions. Leveraging SCOPUS as the primary database, a comprehensive bibliometric analysis encompassing 1380 publications was conducted, subsequently narrowing the focus to 87 recent publications for detailed review. This research endeavors to delineate the defining characteristics of low-cost systems, elucidate their principal applications and preferred platforms, assess accessibility level, gauge the extent of innovation in both hardware and software development, explore the contributions of Deep Learning and data fusion, evaluate the consideration of data quality, and examine the contemporary relevance of photogrammetry within low-cost context. The findings demonstrate that many authors subjectively use the term low-cost to highlight qualities of a technology, methodology or sensor, but challenges arise from data quality comparisons with high-cost systems.
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    Acceleration measurements on Sloshsat FLEVO for liquid force and location determination
    (National Aerospace Laboratory NLR, 2000) Vreeburg, J.P.B.
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    Accident Risk Assessment for Advanced Air Traffic Management
    (National Aerospace Laboratory NLR, 2001) Blom, H.A.P. ; Bakker, G.J. ; Blanker, P.J.G. ; Daams, J. ; Everdij, M.H.C. ; Klompstra, M.B.
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    Accident risk assessment for advanced ATM
    (National Aerospace Laboratory NLR, 1999) Blom, H.A.P. ; Bakker, G.J. ; Blanker, P.J.G. ; Daams, J. ; Everdij, M.H.C. ; Klompstra, M.B.
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    Accident risk assessment for airborne separation assurance
    (National Aerospace Laboratory NLR, 2002) Everdij, M.H.C. ; Blom, H.A.P. ; Bakker, G.J.
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    Accident risk assessment of simultaneous converging instrument approaches
    (National Aerospace Laboratory NLR, 2003) Blom, H.A.P. ; Klompstra, M.B. ; Bakker, G.J.
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    Accuracy analysis of propellant gauging systems
    (National Aerospace Laboratory NLR, 2013) Benthem, R.C. van