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ISSN 打印: 1064-2315

ISSN 在线: 2163-9337

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Real-Time Algorithm for Calculation of the Distance of the Interrupted Take-off

卷 52, 册 4, 2020, pp. 38-46
DOI: 10.1615/JAutomatInfScien.v52.i4.40
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摘要

An interrupted take-off is the situation when the decision about the airplane take-off cancellation is accepted. When it is necessary for the aircraft crew to decide about the interruption of take-off, they compare the current velocity with the "decision-making velocity". Based on this velocity one can estimate whether the aircraft can safely stop within the available distance of the interrupted flight. These values are taken from the "Aircraft Flight Manual" before the take-off. The analysis of accidents shows that if the current velocity tends to the "decision-making velocity", the real distance of the interrupted flight (the braking distance until the complete aircraft stop) can change from the computed value in advance. The distance of the interrupted take-off can be underestimated, which results in overrun beyond the existing distance. The overestimation of the distance of the interrupted flight prevents the crew from choosing the decision "interrupt take-off" although it is still safe. The proposed real-time algorithm of the determination of the distance of the interrupted flight uses the step-wise interpolation of the thrust. Two intervals of the thrust variation (the thrust decreases from the maximum to zero and then increases to the nominal reversal thrust) can be interpolated by three intervals of the constant thrust (flight thrust, zero thrust, nominal reverse thrust). Using this interpolation, the Riccati equation of the aircraft motion has three different explicit solutions, corresponding to three different constant values of the thrust. These solutions can be used in realtime computations. The algorithm takes into account different aircraft parameters (velocity, thrust, etc.) before the time instant of decision making. As a result, it is possible to estimate the distance of the interrupted take-off more exactly in comparison with the advanced computed value. This is especially important if the aircraft velocity is close to the "decision-making velocity". In this situation, the aircraft crew obtains more accurate information about the distance of the interrupted take-off and avoids the rolling out of the airport boundaries during the interrupted take-off. Thus, the decision about the interrupted take-off will be more reliable and safe.

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对本文的引用
  1. Rappoport I. S., Method of Resolving Functions for Game Problems of Approach of Controlled Objects with Different Inertia, Cybernetics and Systems Analysis, 57, 2, 2021. Crossref

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