Methodology for collision risk assessment of an airspace flow corridor concept

Zhang, Yimin; Shortle, John; Sherry, Lance

doi:10.1016/j.ress.2015.05.015

Cited by 24 publications

(9 citation statements)

References 33 publications

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“…For two advanced ATM applications [52] and [111] propose to go further; they provide an initial estimation of (near) collision probabilities through using DET in combination with reliability diagrams for technical system failures and MC simulation for the estimation of conflict probabilities between 2 aircraft. However, their DET has a similar limitation like FTA, ETA and BBN, in the sense that it does not model nonfunctional hazards, and neither is able to identify unknown (positive or negative) emergent behavior.…”

Section: B Discussion Of Model Restrictionsmentioning

confidence: 99%

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Mathematical Models for Air Traffic Conflict and Collision Probability Estimation

Mitici

Blom

2019

IEEE Trans. Intell. Transport. Syst.

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Increasing traffic demands and technological developments provide novel design opportunities for future Air Traffic Management (ATM). In order to evaluate current air traffic operations and future designs, over the past decades several mathematical models have been proposed for air traffic conflict and collision probability estimation. However, few comparative evaluations of these models with respect to their mathematical core exist. Such comparative evaluations are particularly difficult since different authors employ different model definitions, notations and assumptions, even when using the same modeling techniques. The aim of this paper is: i) to present the mathematical core of the existing approaches for air traffic conflict and collision probability estimation using the same body of notations and definitions; ii) to outline the advances in estimating the probability of air traffic conflict and collision using a unified mathematical framework; iii) to various air traffic applications and their use of directed mathematical models for air traffic conflict and collision probability estimation; and iv) to provide insight into the capabilities and restrictions of the mathematical models in the evaluation of future ATM designs.

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Section: B Discussion Of Model Restrictionsmentioning

confidence: 99%

“…Illustrative applications using dynamic BBN-based conditional MC simulation are [15], [113]. An illustrative application using FTA and DET-based conditional MC simulation is [111]. Potential limitations of such conditional MC simulation are threefold.…”

Section: B Discussion Of Model Restrictionsmentioning

confidence: 99%

Mathematical Models for Air Traffic Conflict and Collision Probability Estimation

Mitici

Blom

2019

IEEE Trans. Intell. Transport. Syst.

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“…The threshold value for separation for trigging transition to the target velocity state Conflicts are measured by the conflict rate, lane-switch rate and breakout rate in the corridor which belongs to the strategic intent-based conflict detection and resolution safety level (22) . The lane-switch rate is the proportion of aircraft that switch from one lane to another for overtaking or avoiding the loss of the minimum separation which is considered as resolvable conflict rate in the corridor.…”

Section: Separation Buffermentioning

confidence: 99%

Sensitivity analysis of potential capacity and safety of flow corridor to self-separation parameters

Shortle

Ochieng³

et al. 2018

Aeronaut. j.

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A flow corridor is a new class of trajectory-based airspace that encloses groups of flights which fly along the same path in one direction and accept responsibility for separation from each other. A well-designed corridor could reduce the airspace complexity, decrease the workload of air traffic controllers and increase the airspace capacity. This paper analyses the impact of different self-separation parameters on capacity and conflicts of the flow corridor. Both the quantitative impact and interaction effects of pairs of parameters are evaluated using the combined discrete-continuous model and Monte Carlo simulation method. The simulation results show that although the initial separation is the dominating factor, the interactions between initial separation and separation buffer, minimum separation, extra switch buffer, extra threshold buffer and velocity difference threshold also have some significant impacts on the capacity and conflicts for the flow corridor.

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“…The spacecraft can be serious damaged or even get complete wrecked by hypervelocity space debris collision. This kind of collision becomes the top threat to the safe operation of orbit spacecraft [1,2]. A variety of high performance protective materials and structures, such as Kevlar cloth, Nextel cloth and Beta cloth [3][4][5][6][7][8][9], have been developed.…”

Section: Introductionmentioning

confidence: 99%

Study on the interfacial bonding mechanism of Al/Mg gradient material

Long

Peng

Sun

et al. 2020

Mater. Res. Express

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Ti/Al/Mg impedance-graded material sheet is an alternative to the homogeneous single-layer sheets, which has been presented to improve shielding performance through the high efficient absorption and dissipation of fragment kinetic energy. Nevertheless, one limitation of the Ti/Al/Mg gradient material is associated with the weak Al/Mg interface. The purpose of this study is to investigation the interfacial bonding mechanism of Al/Mg gradient material interface. Microstructure characteristics at the Al/Mg interface have been investigated. It shows that an isolated island structure preferentially generates at the crystal defect as a consequence of interdiffusion, which is composed of Al 3 Mg 2 and Al 12 Mg 17 . Then such intermetallic compounds (IMCs) grow to continuous layers with distinct convex. Finally, the interface is fully transformed into flat. A theoretical analysis and calculation have been carried out to explain the thermodynamically feasibility of IMCs. The evolution mechanism of voids at the interface is also discussed. Fractographic analysis performed on selected specimens shows typical brittle cleavage fracture characteristics, and detailed analyses reveal that the fracture failure is associated with brittle IMCs.

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Methodology for collision risk assessment of an airspace flow corridor concept

Cited by 24 publications

References 33 publications

Mathematical Models for Air Traffic Conflict and Collision Probability Estimation

Mathematical Models for Air Traffic Conflict and Collision Probability Estimation

Sensitivity analysis of potential capacity and safety of flow corridor to self-separation parameters

Study on the interfacial bonding mechanism of Al/Mg gradient material

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