The Response of Aircraft Encountering Aircraft Wake Turbulence

Identification of Aircraft Wake Vortex Based on SVM

Mathematical Problems in Engineering ◽

10.1155/2020/9314164 ◽

2020 ◽

Vol 2020 ◽

pp. 1-8

Author(s):

Weijun Pan ◽

Zhengyuan Wu ◽

Xiaolei Zhang

Keyword(s):

Environmental Parameters ◽

Classification Model ◽

Support Vector ◽

Wake Vortex ◽

Doppler Lidar ◽

Pulsed Doppler ◽

Wind Fields ◽

Wake Turbulence ◽

Aircraft Wake ◽

Separation Standards

The aircraft wake vortex has important influence on the operation of the airspace utilization ratio. Particularly, the identification of aircraft wake vortex using the pulsed Doppler lidar characteristics provides a new knowledge of wake turbulence separation standards. This paper develops an efficient pattern recognition-based method for identifying the aircraft wake vortex measured with the pulsed Doppler lidar. The proposed method is outlined in two stages. (i) First, a classification model based on support vector machine (SVM) is introduced to extract the radial velocity features in the wind fields by combining the environmental parameters. (ii) Then, grid search and cross-validation based on soft margin SVM with kernel tricks are employed to identify the aircraft wake vortex, using the test dataset. The dataset includes wake vortices of various aircrafts collected at the Chengdu Shuangliu International Airport from Aug 16, 2018, to Oct 10, 2018. The experimental results on dataset show that the proposed method can identify the aircraft wake vortex with only a small loss, which ensures the satisfactory robustness in detection performance.

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Aircraft Wake Turbulence and Its Detection

10.1007/978-1-4684-8346-8 ◽

1971 ◽

Cited By ~ 37

Keyword(s):

Wake Turbulence ◽

Aircraft Wake

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Safety Evaluation of A380 Wake Turbulence Separation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.278-280.31 ◽

2013 ◽

Vol 278-280 ◽

pp. 31-34

Author(s):

Jian Guo Kong

Keyword(s):

Safety Evaluation ◽

Standard Setting ◽

Civil Aviation ◽

International Civil Aviation Organization ◽

Target Level ◽

Wake Turbulence ◽

Aircraft Wake ◽

Calm Wind ◽

Medium Type

CAAC (Civil Aviation Administration of China) set a standard on A380 wake turbulence separation right after China Southern Airlines brought in Airbus A380 in 2001.This paper considers from the possibility of the latter aircraft wake turbulence influencing the preceding one, which means the wake turbulence risk, makes safety evaluation on the wake turbulence separation standard of the preceding aircraft as A380, and the latter one as heavy type, medium type and light type, based on the safety target level that ICAO (International Civil Aviation Organization) authorized. Each type chooses a typical aircraft to calculate the possibility of influenced by the preceding wake turbulence corresponding with the standard under calm wind. The final result shows that the A380 wake turbulence separation standard setting by CAAC is safe.

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The Vortex Merger Factor in Aircraft Wake Turbulence

The Aeronautical Journal ◽

10.1017/s0001924000000531 ◽

2005 ◽

Vol 109 (1091) ◽

pp. 1-13 ◽

Cited By ~ 1

Author(s):

Miroslav Mokry

Keyword(s):

Load Distribution ◽

Wind Shear ◽

Physical Principle ◽

Two Dimensional ◽

Vortex Sheets ◽

Discrete Vortex ◽

Wake Turbulence ◽

Wing Load ◽

Aircraft Wake ◽

Vortex Merger

Abstract Vortex merger is studied within the context of two-dimensional discrete vortex sheets and demonstrated on two equally oriented circular vortices and aircraft tip and flap vortices. It is confirmed that, depending on the wing load distribution, the latter may or may not coalesce into a single counter-rotating pair. The interaction of a vortex with an equally oriented shear layer, governed by the same physical principle, suggests a possible intensification of an aircraft vortex in cross-wind shear.

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