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Advanced Data Fusion for Airport Surveillance

Bloem, E.A. (author), Blom, H.A.P. (author), van Schaik, F.J. (author)

The surveillance function plays a key-role within an Advanced Surface Movement Guidance and Control System (A-SMGCS) since it provides essential information to the air traffic controllers as well as to other A-SMGCS functions. This paper presents an overview of airport surveillance research at the National Aerospace Laboratory NLR of the...

report 2002

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Deploying network real-time simulation, putting the virtual enterprise to work - Some aerospace experience

Kesseler, E. (author)

Aerospace products are typically high-tech, high quality and low volume. They are produced by specialised geographically dispersed companies. The production is dominated by a large amount of engineering. In the engineering phase each company makes extensive use of real-time simulation for its own (sub) systems. At the same time the aerospace...

report 2002

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Piuriformity of the Air Traffic Management R&D Landscape

Brüggen, J. (author)

This millennium's Air Traffic Management (ATM) challenges can only be faced with a new paradigm for ATM research in Europe. The rising delays, the legitimate concerns over ATM safety (collision risk) in the air as well as on the ground and the growing environmental pressure necessitates the review of ATM R&D performance in Europe and the...

report 2002

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Wake vortex safety evaluation of single runway approaches under different weather and operational conditions

van Baren, G.B. (author), Speijker, L.J.P. (author), de Bruin, A.C. (author)

The steady increase in air traffic imposes a need for enhanced airport capacity, and the desire to safely reduce existing separation minima. An important capacity constraint factor is the risk imposed by wake vortices. In view of the uncertainties and the difficulties in understanding the wake vortex phenomena, a novel WAke Vortex Induced Risk...

report 2002

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Advanced Flight Data Analysis

van Es, G.W.H. (author)

The commercial aviation industry provides the safest form of transportation in the world. Nevertheless the pressure for continued improvement in safety will remain in response to the predicted growth in both passenger and freight traffic volumes. One of the most important tools to improve the safety of flight operations is to have a Flight Data...

report 2002

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Refined Flow Management - An operational concept for Gate-to-Gate 4D flight planning

de Jonge, H.W.G. (author)

One of the most urgent problems of ATM is to reduce delays and to improve the punctuality of air traffic arriving at congested hub-airports. Layered planning with refinement and convergence in time and space, as proposed by EATMP [European ATM Programme], could give the required support for better use of these scarce resources. Refined Flow...

report 2002

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A Simple, Robust and Fast Algorithm to Compute Deformations of Multi-Block Structured Grids

Spekreijse, S.P. (author), Prananta, B.B. (author), Kok, J.C. (author)

A grid deformation method has been developed for the movement of multiblock, structured grids due to surface deformation arising from aeroelastics or design optimisation. The method uses a volume spline interpolation technique to compute the deformation of block vertices and block edges. After that, the deformation of block-faces is computed by...

report 2002

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Space-time discontinuous Galerkin finite element method with dynamic grid motion for inviscid compressible flows - Efficient flux quadrature

van der Ven, H. (author), van der Vegt, J.J.W. (author)

A new and efficient quadrature rule for the flux integrals arising in the space-time discontinuous Galerkin discretization of the Euler equations in a moving and deforming space-time domain is presented and analyzed. The quadrature rule is a factor three more efficient than the commonly applied quadrature rule and does not affect the local...

report 2002

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Observations on literate program structure

Guravage, M.A. (author)

In this paper we compare the structure of programs written in literate and traditional imperative programming styles. Considering literate programs as "webs" of interconnections, we model and analyze the patterns of connections particular to literate programs, and compare them to the call graph structures of traditional imperative programs. The...

report 2002

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Helicopter ground vortex: comparison of numerical predictions with wind tunnel measurements

Boer, J.F. (author), Hermans, C. (author), Pengel, K. (author)

In the framework of the Brite Euram project HELIFLOW, research activities were conducted aimed at knowledge acquisition in the area of interactional aerodynamics, validation of wind tunnel test technologies and verification of related theoretical tools. This paper describes the ground vortex activities performed in Task 3 of the project, which...

report 2001

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Geometric and probabilistic approaches towards Conflict Prediction

Bakker, G.J. (author), Kremer, H.J. (author), Blom, H.A.P. (author)

In this paper four conflict prediction approaches are considered: a classical geometric approach, two variations of a probabilistic approach developed by Paielli & Erzberger, based on conflict probability and overlap probability and a novel probabilistic approach. The objective of all conflict prediction approaches is to evaluate a set of...

report 2001

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Accident Risk Assessment for Advanced Air Traffic Management

Blom, H.A.P. (author), Bakker, G.J. (author), Blanker, P.J.G. (author), Daams, J. (author), Everdij, M.H.C. (author), Klompstra, M.B. (author)

By now, safety is recognised as a key quality on which to select/design advanced air traffic management (ATM) concepts, even when capacity and efficiency are the drivers of the development. The safety target is often described as 'equal or better' in comparison with existing practice, allowing a large freedom in how safety is expressed, let...

report 2001

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Human cognition modelling in Air Traffic Management safety assessment

Blom, H.A.P. (author), Daams, J. (author), Nijhuis, H.B. (author)

This paper develops a mathematical model for cognitive performance of a tactical air traffic controller in an en-route ATC context. The aim of this model-based approach is to enable the evaluation of both accident risk and aspects like cognitive workload and effectiveness of ATC in managing air traffic situations safely.Use is made of human...

report 2001

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Flap noise measurements in a closed wind tunnel with a phased array

van de Wal, H.M.M. (author), Sijtsma, P. (author)

The effects of winglet type "fences" at the outboard flap tip, and a blunt flap trailing edge on the airframe noise have been measured in a low-speed wind tunnel on a 8.5% half model. Both a single (extending downward) and a double type "fence" configuration (extending upward as well as downward from the wing) have been investigated. An airframe...

report 2001

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Probabilistic Approaches toward Conflict Prediction

Bakker, G.J. (author), Kremer, H.J. (author), Blom, H.A.P. (author)

In this paper four conflict prediction approaches are considered: a classical geometric approach, two variations of a probabilistic approach developed by Paielli ÖC Erzberger, based on conflict probability and overlap probability, and a novel probabilistic approach. The objective of all conflict prediction approaches is to evaluate a set of...

report 2001

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Delegating configuration management responsibilities within the software development process

Guravage, M.A. (author)

A software project produces a number of items during its execution, including various documents, programs, data, and test artifacts. Configuration management (CM) is the aspect of project management that is concerned with identifying distinct variants of these items, and systematically controlling how they change. Configuration management is...

report 2001

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Test and evaluation of precipitation drag on an aircraft caused by snow and standing water on a runway

Giesberts, M.K.H. (author)

This report is based on a paper presented by NLR on the 22"" International Congress of Aeronautical Sciences (ICAS 2000) hosted by the Royal Aeronautical Society (Raes) from August 27* to September T' 2000 in Harrogate (UK). This presentation contained the results of the CONTAMRUNWAY project which started in 1997 when the European Commission (EC...

report 2001

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Computations of three-dimensional unsteady supersonic cavity flow to study the effect of different downstream geometries

Soemarwoto, B.I. (author), Kok, J.C. (author)

Computations of three-dimensional unsteady supersonic cavity flow are performed for a freestream Mach number of 1.2. Two cavity geometries are considered: (i) a simple rectangular cavity of length-to-depth (L/D) and length-to-width (L/W) ratios of 4.5, and (ii) a cavity with a 45° ramp attached to the downstream wall of the simple rectangular...

report 2001

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Multitlme multlgrid convergence acceleration for periodic problems with future applications to rotor simulations

van der Ven, H. (author), Boelens, O.J. (author), Oskam, B. (author)

The simulation of certain time-dependent flow phenomena can pose a grand challenge to Computational Fluid Dynamics. In this paper, a multitime multigrid convergence acceleration algorithm is introduced which significantly reduces the turnaround time to reach time-periodic solutions. The application of this convergence acceleration algorithm will...

report 2001

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CKspray: Impingement drag calculation of aircraft on water-contaminated runways

Gooden, J.H.M. (author)

This paper describes an engineering method developed for calculating the water spray and the precipitation drag for aircraft on water-contaminated runways. The spray is considered to consist of a large number of individual particle trajectories. A Monte Carlo approach is followed to obtain realistic spray characteristics. Precipitation drag is...

report 2001