Combination of optimal control approaches for aircraft conflict avoidance via velocity regulation

The problem of aircraft conflict avoidance for Air Traffic Management systems is studied. In the scenario, aircraft are considered to fly within a shared three-dimensional airspace and not allowed to approach close less than a minimum safe separation during their flights in order to avoid various conflicts. This paper proposes a formulation of the three-dimensional conflict avoidance problem as a Mixed Integer Non-Linear Programming (MINLP) model where aircraft are allowed to change both their heading angle and velocity simultaneously to keep the separation. The validity of the proposed model is demonstrated by a comparison of the results from the MINLP model and the previous conflict avoidance models with one maneuver of the heading angle or the velocity. The numerical studies show that the MINLP model improves the efficiency of computation and maintain the safety of flights even by using a standard global optimization solver

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Mixed integer nonlinear programming for three-dimensional aircraft conflict avoidance

10.7287/peerj.preprints.27410v1 ◽

2018 ◽

Author(s):

Junling Cai ◽

Ning Zhang

Keyword(s):

Traffic Management ◽

Three Dimensional ◽

Mixed Integer ◽

Conflict Avoidance ◽

Non Linear Programming ◽

Proposed Model ◽

Minlp Model ◽

Heading Angle ◽

Comparison Of The Results ◽

Aircraft Conflict Avoidance

The problem of aircraft conflict avoidance for Air Traffic Management systems is studied. In the scenario, aircraft are considered to fly within a shared three-dimensional airspace and not allowed to approach close less than a minimum safe separation during their flights in order to avoid various conflicts. This paper proposes a formulation of the three-dimensional conflict avoidance problem as a Mixed Integer Non-Linear Programming (MINLP) model where aircraft are allowed to change both their heading angle and velocity simultaneously to keep the separation. The validity of the proposed model is demonstrated by a comparison of the results from the MINLP model and the previous conflict avoidance models with one maneuver of the heading angle or the velocity. The numerical studies show that the MINLP model improves the efficiency of computation and maintain the safety of flights even by using a standard global optimization solver

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Conflict Avoidance in Old Age

GeroPsych ◽

10.1024/1662-9647/a000168 ◽

2017 ◽

Vol 30 (2) ◽

pp. 61-70 ◽

Cited By ~ 4

Author(s):

Lia Oberhauser ◽

Andreas B. Neubauer ◽

Eva-Marie Kessler

Keyword(s):

Social Support ◽

Perceived Social Support ◽

Well Being ◽

Cross Sectional Study ◽

Conflict Avoidance ◽

Subjective Well Being ◽

Sectional Study ◽

Cross Sectional ◽

Adult Lifespan ◽

Set Up

Abstract. Conflict avoidance increases across the adult lifespan. This cross-sectional study looks at conflict avoidance as part of a mechanism to regulate belongingness needs ( Sheldon, 2011 ). We assumed that older adults perceive more threats to their belongingness when they contemplate their future, and that they preventively react with avoidance coping. We set up a model predicting conflict avoidance that included perceptions of future nonbelonging, termed anticipated loneliness, and other predictors including sociodemographics, indicators of subjective well-being and perceived social support (N = 331, aged 40–87). Anticipated loneliness predicted conflict avoidance above all other predictors and partially mediated the age-association of conflict avoidance. Results suggest that belongingness regulation accounts may deepen our understanding of conflict avoidance in the second half of life.

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