Journal of Civil Aviation University of China

Stationarity and nonlinearity test of air traffic flow time series

WANG Fei

2021, 39(2): 1-6.

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In order to provide a reasonable criterion for the real-time analysis and short-term prediction of air traffic flow based on nonlinear theory, the stationarity and nonlinearity test methods of air traffic flow time series are studied. Firstly, the time series of traffic flow is constructed with 40-day data and 15-minute statistical interval; Then, the stability of the time series is analyzed by both qualitative method based on autocorrelation graph and quantitative method based on ADF(augmented Dickey-Fuller test) and PP(Phillips-Perron)test; Then, the non-linearity of the time series is studied by using surrogate data method; Finally, the effects of length, time delay and statistical scale on nonlinearity are analyzed. Results show that the autocorrelation coefficient of time series decreases rapidly and tends to zero, and there is no unit root in the generation process of time series data, which indicates that time series is stationary. The third -order time inverse asymmetry, third -order autocorrelation and third - order autocovariance are used as test statistics, and the third null hypothesis is rejected, which indicates that time series has a non-linear component, and the component originates from the dynamic process of the system itself. In addition, long-length time series often reflects more stable non-linearity, and short-length time series often does not reflect non -linearity. Time delay has a greater impact on the third -order statistics of time inverse asymmetry, but a smaller impact on the statistics. Time series with 30-minute scale is more suitable for shortterm prediction of Sanya No.4 Sector

Calculation of maximum failure speed of military aircraft

ZHENG Fengmin, AN Y an

2021, 39(2): 7-11.

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According to the calculation principle of failure speed, the aircraft motion simulation model is established. The key point is to combine the brake model, pneumatic model, engine model and landing gear system model, and to compile the calculation program to simulate the aircraft‘s acceleration run -off section and brake stop section. Taking one military aircraft as an example, a high-precision model solver based on the fourth-order Runge Kutta method is established, and the calculation method of the maximum failure speed of military aircraft is given. Calculation result of the algorithm can well fit the actual test flight data, providing reference for the actual training of troops.

Prediction of wake turbulence separation reduction effect based on RECAT-EU

WANG Xueyao, LYU Jiahang, WEI Zhiqiang

2021, 39(2): 12-15.

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RECAT-EU is proposed by EUROCONTROL as a wake turbulence separation standard. In order to analyze the implementation effect of RECAT-EU, firstly, the background of which is studied, then the corresponding mode are established and the expected capacity increase calculation software is developed by Matlab. Take Guangzhou Baiyun International airport as an example, the capacity increasing effect in different time periods and for different types of aircrafts is analyzed by using this software. Results show that the RECAT-EU wake turbulence separation standard can increase the capacity by about 6%

Frequency-domain characteristics of DME interference signal

LI Dongxia, CHEN Pei, LIU Haitao, WANG Lei

2021, 39(2): 16-20.

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DME signal is the main interference source of L -DACS1. It is necessary to research the frequency -domain characteristics of DME signals in order to find the effective DME interference suppression algorithm. Firstly, a normalized DME signal model is established, and the closed -form mathematical expressions of spectrum and power spectrum of baseband DME signal and carrier offset DME signal are derived. Then, basing on the transmission characteristics of the ideal low-pass filter, the spectrum and power spectrum of the carrier offset DME signal after low-pass filter are given. Finally, the average power of DME signal after filtering is calculated. Simulation result shows that the power attenuation of carrier offset DME signal after low-pass filtering is about 33 dB, verifying the correctness of the theoretical derivation.

High-precision position solution method for airport scene monitoring

WANG Li, Lei

2021, 39(2): 21-25.

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Optimizing the monitoring points of complicated airport scenes can effectively improve the operating efficiency of airport scenes. However, the real-time positioning of monitoring points with high precision is still unresolved. Aiming at this problem, an adaptive niche ejection particle swarm algorithm combined with Taylor series expansion method is proposed. The positioning results of the proposed algorithm are taken as initial reference points for Taylor series iteration, solving the dependence of traditional Taylor series expansion method on the initial reference point selection. Simulation results show that the positioning estimation accuracy of the improved particle swarm algorithm combined with the Taylor series expansion method is greatly improved compared with the simple Taylor series expansion method.

Irregular flight recovery based on loss of airline

DA I Fuqing, ZHANG Shunyao

2021, 39(2): 26-30.

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In order to solve the irregular flights caused by weather, flow control, engineering maintenance and passenger factors, a flight recovery model is built with the objective function of minimizing the sum of direct and indirect loss of airlines. The impact of passengers disappointment in different cabins caused by flight delay on the future ticket sales of airlines is categorized. The concept of opportunity cost is applied into the function in order to improve the calculation of loss types. A dynamic decision algorithm is designed to find the solution of the model, and instance shows that the irregular loss of flights can be reduced to 44% by this algorithm, proving the advantages of this algorithm in solving flight recovery problems.

Multi-objective optimization model for hub city selection in airline network

FAN W ei, NING Junwen

2021, 39(2): 31-36.

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The selection of hub city is one of the key issues of airline network design. Aiming at the different orientation of each city in the airline network, the ELECTRE algorithm is used to screen the candidate hub city set; then, a multi-objective optimization model based on priority and multi-allocation p-hub location without capacity limit has been proposed, and the multi-objectives is solved step by step. Results show that with more accessible cities and more hub cities, the optimized airline network structure can propose optimal airline network structure basing on rational selection of hub city and effectively reduce the total transportation cost

Effects of flight experience and hazardous attitude on flight safety performance

WANG Lei, GAO Shan, ZHANG Jingyi

2021, 39(2): 37-41.

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In order to study the effects of hazardous attitude of airline pilots on flight safety performance, flight experience is considered and 45 data samples of airline pilots忆 exceedance rates are collected. The occurrence frequency of exceedance events is set as an index to evaluate flight safety performance. Then the risk psychological variables of pilots are measured by using hazardous attitude scale and the data are analyzed by Pearson correlation and partial correlation methods. Result shows that flight experience, hazardous attitude and exceedance rate of airline pilots are correlated and the flight experience exacerbates the effect of hazardous attitude on exceedance rate. It is concluded that the hazardous attitude level of pilots can partially predict exceedance behaviors and safety performance. Moreover, airline pilots need to pay attention to the correction and training of their hazardous attitude and avoid the occurrence of 耶alternative爷 events when their flight hours and experience increase.

Certification requirement analyses based on HUD guidance capability

ZHANG Fan, WANG Ruixuan, XIAO Guosong , WANG Peng

2021, 39(2): 42-46.

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In order to enhance the ability of all-weather operation of civil aviation, and improve the safety level, head-up display(HUD) is developed. The application of HUD guidance function not only supports the takeoff and landing with low visibility, but also puts forward new safety requirements. In order to solve the problem of insufficient support for the verification and evaluation of HUD guidance function in the existing domestic operation certification standard system, the functional development verification and operational evaluation requirements are analyzed, and the targeted certification elements and review requirements are given, which can provide theoretical support for the airworthiness certification of HUD guidance function

Contour measuring and cutting method for high-voltage cable joints

MAO Jie, LI Peibo, GUAN Enguang , LIU Jihao , ZHAO Y anzheng

2021, 39(2): 47-53.

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A new measuring and cutting method is proposed aiming at the problem of high surface roughness and low profile consistency in high-voltage cable processing. Firstly, the error model of installation parameters is established袁 the joint contour is scanned by laser displacement sensor, and the cross-section contour is fitted by least square method. The contour fitting error is less than 0.12% , making it possible to reconstruct the contour and axis trajectory of joints with high precision. Then the tool feeding is obtained and the discrete feeding is smoothed by using interpolation algorithm, which can effectively solve the contradiction between control system bandwidth and cutting surface roughness. By designing this new cutting machine, the contour measuring and cutting method of high-voltage cable joints is verified, proving that this method is reliable and effective and can meet the technical requirements of high-voltage cable joint forming.

Action recognition method based on depth image and skeleton information

ZHANG Liang, QIAN Yimin

2021, 39(2): 54-60.

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The complexity of human body movements, within-class differences and perspective changes hinder the accurate recognition of human movements. Depth camera can simultaneously record depth images and extract skeleton information; basing on that, a motion recognition method is proposed. Depth image sequence is used to generate a motion history point cloud and extract global features and local motion features from 3D skeleton information. Point cloud features and skeleton features are fused to construct a multi-modal feature fusion action recognition method. Test on two data sets of MSR-Action3D and UTKinect-Action3D shows that recognition rates are above 95% and 98.0%, which proves the effectiveness of the method

Influences of adhesive film on bonded-bolted hybrid single-lap joints’ performance

XU Chen, SUN Y ongbo

2021, 39(2): 61-64.

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A 3D model of bonded-bolted hybrid single -lap joints contending is established based on ABAQUS, damage criteria and stiffness attenuation criterion are added in order to achieve progressive damage analysis. The model is used to analyze the influences on the structure while the thickness and ductility was altered. Results indicate that applied with brittle adhesive film, thicknessincrease can improve the bearing performance of the structure. Varying degrees of ductile adhesive film could provide similar improvement to the bearing performance of the structure. The proposed calculating methods and conclusions could provide reference to composite structure design.

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