Escaping Microburst with Turbulence: Altitude, Dive, and Pitch Guidance Strategies

Dogan, Atilla; Kabamba, Pierre T.

doi:10.2514/2.2642

Cited by 23 publications

(29 citation statements)

References 23 publications

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“…This is because Sf being less than 1 means that the aircraft does not have enough vertical force capability to maintain its altitude. Thus, we have analytically corroborated the results of the Monte Carlo simulation in [13] : the probability of crash decreases as the commanded altitude decreases as long as the commanded altitude is higher than an optimal value.…”

Section: Statistical Properties Of the Safety Factorsupporting

confidence: 72%

“…Like in Ref. [13], Modified Altitude-Guidance appears to perform better than the other escape strategies.…”

Section: Introductionsupporting

confidence: 50%

“…The equations of longitudinal aircraft motion (including the effect of windshear) used in this paper are equivalent to those given in Ref. [13]. Aircraft data and aerodynamic coefficients used in this study are representative of a large, jet-engine commercial transport airplane in landing configuration [14].…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Among these studies, only Refs. [4], [10], and [12,13] suggest that an initial descent may improve the safety of an escape maneuver. However, Refs.…”

Section: Introductionmentioning

confidence: 99%

“…[4], [10] and [12] use point-mass aircraft models and do not consider the effect of turbulence, stall prevention action, or air vorticity on escape performance. Our previous study [13], using a 6-DOF aircraft model and taking into account the effects of turbulence, stall prevention and air vortic-ity, showed that the probability of crash decreases as the commanded altitude decreases as long as the commanded altitude is higher than an optimal value. However, instead of descending to an optimal altitude in every microburst encounter, it may be possible to safely recover with a commanded altitude that is higher than the optimal commanded altitude.…”

Section: Introductionmentioning

confidence: 99%

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Modified guidance laws for escaping a microburst with turbulence

Dogan¹,

Kabamba²

2000

18th Applied Aerodynamics Conference

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This paper introduces Modified Altitude-and Dive-Guidance laws for escaping a microburst with turbulence. First, a new safety metric is constructed that quantifies the aircraft upward force capability in a microburst encounter. In the absence of turbulence, the safety factor is shown to be a decreasing function of altitude. This suggests that descending to a low altitude may improve safety in the sense that the aircraft will have more upward force capability to maintain its altitude. In the presence of stochastic turbulence, the safety factor is treated as a random variable and its probability distribution function is analytically approximated as a function of altitude. This approximation allows us to determine the highest safe altitude at which the aircraft may descend, hence avoiding to descend too low. This highest safe altitude is used as the commanded altitude in Modified Altitude-and Dive-Guidance. Monte Carlo simulations show that these Modified Altitude-and Dive-Guidance strategies can decrease the probability of minimum altitude being less than a given value without compromising the probability of crash. That is, an aircraft with Modified Altitude-or Dive-Guidance can have a higher recovery altitude without increasing the risk of ground contact or stall. 1

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Section: Statistical Properties Of the Safety Factorsupporting

confidence: 72%

“…Like in Ref. [13], Modified Altitude-Guidance appears to perform better than the other escape strategies.…”

Section: Introductionsupporting

confidence: 50%

Section: Mathematical Modelmentioning

confidence: 99%

“…Among these studies, only Refs. [4], [10], and [12,13] suggest that an initial descent may improve the safety of an escape maneuver. However, Refs.…”

Section: Introductionmentioning

confidence: 99%