Table of Content

15 August 2022, Volume 40 Issue 4

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Civil Aviation

EMI near-field array measurement and spatial analysis in open test filed

GONG Fengxun, HE Ruirui

2022, 40(4):  1-9. 

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In order to improve the efficiency, accuracy and scale of measuring the radiated electromagnetic interference (EMI), an improved electric ringlet probe is designed and used to construct an electric ringlet probe array for EMI near-field measurement. By changing different height, distance and power parameters, an open near-field test environment of co-channel interference and in-band interference of dual signals is constructed. According to the actual measurement data, the radiation distribution of E-plane and H-plane of the tested omnidirectional antenna and directional antenna is visually displayed, and the spatial distribution state of the radiated signal is reconstructed. The radiated interference states under different interference distance, different interference power, co-channel interference and in-band interference are depicted, and the changing trends of interference under these different conditions are compared. It is found that the closer the interference distance, the greater the interference power, and the greater the intensity of radiated interference. In addition, the influence of the co-channel interference on the interference state is greater than that of the in-band interference. The near-field measurement probe array can realize the judgment of radiation interference and interference mode, which has a relatively wide range of engineering application value.

The design and realization of ADS-B receiver monitoring and testing software

HU Tieqiao, BI Ziwen

2022, 40(4):  10-16. 

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To realize the performance test of the automatic dependent surveillance-broadcast (ADS-B) receiver, the monitoring and testing software of the ADS-B receiver is developed and designed. Through the user datagram protocol(UDP) port, ADS-B messages are received from the receiver. Multi-threading technology is used to receive and decode ADS-B data at high speed in real time. Memory initialization file (MIF) map data files and Google Earth are used for track display and flight information visualization. With the setting of the software system, the performance of the ADS-B receiver is tested and the signal source is verified. The test results show that the ADS-B receiver monitoring software has a friendly man-machine interface and is easy to operate, which can better realize the testing of the receiver.

Coordinated scheduling optimization of flight based on air-ground integration

GAO Dexiong , ZHANG Chenliang , SHI Zichang , ZHANG Lingyu

2022, 40(4):  17-21. 

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To alleviate the problem of unreasonable flight delays, coordinated optimization of airport slot based on air-ground integration is proposed. This thesis takes the system which consists of parking stands, runways and waypoints as the research object, in perspective of the collaborative decision -making of air traffic control, airports and airlines, and establishes an optimization mathematical model of the maximum normal rate of airport release based on the actual operation of the flights. The strategic optimization results are studied with the aid of CPLEX solver. In addition to the basic operational restrictions of the airports, the model also introduces the waypoints capacity as innovation. The actual operation data of Nanjing Lukou Airport are used to verify the assumption. The optimization results show that flight number for optimization decreases as flow control increases, the total departure delay decreases by 486 min, while the normal release rate increases by 14.8%.

Benefit analysis and evaluation of air overpass based on DEA model

WANG Lili, HU Qiwei

2022, 40(4):  22-26. 

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In order to solve the problems of diverse construction benefits of air overpasses in different regions and few construction benefits in some regions, based on the collected real-time data，a data envelopment analysis(DEA) model with five evaluation indexes of total complexity, hourly risk, all day risk, hourly flow and all day flow is established. The C2 R model in DEA method is used to analyze 10 regions in China. The results show that the benefit values of Zhoukou and Changwu air overpass reach the best state, which shows that this method can be used as a means to evaluate the efficiency of air overpasses in different regions.

Research on terminal sector dynamic programming based on improved Voronoi diagram

GUO Yushuai

2022, 40(4):  27-31. 

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In order to improve the efficiency of air traffic control, firstly, by improving the horizontal division method of the Voronoi diagram and introducing the concept of weight, the airspace of the terminal area is divided; secondly, with the constraint structural characteristics, the improved ant colony algorithm is used to divide the terminal area control working state into three situations according to time period, and a sector dynamic programming model is established; finally, taking Kunming terminal area as an example, the validity of the model is verified by simulation, which can provide better airspace conditions for front-line control work.

Deduplication fixed-length block method based on characteristics of civil aviation data

DING Jianli, LI Hui, CAO Weidong

2022, 40(4):  32-37. 

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Aiming at the problem of data duplication in the storage of civil aviation data during disaster recovery and back-up. A deduplication fixed-length block method based on the characteristics of civil aviation data is proposed. According to the consistency of civil aviation data types, this method combines the advantages of fixed-length block and variable-length block, and designs a data structure of the block strategy index table. A block strategy is provided for the same type of data, and time is saved to find the boundary of the data block during block division, the simulated data deduplication rate during backup increases to 97.8%~99.3%, which is 11.8%~12.5% higher than that of the fixed-length block method, and 2.5%~3.0% higher than that of the variable length block method; at the same time, a new block strategy is established for new data types to facilitate subsequent data stream matching and improve hit accuracy.


Study on finished product storage aging performance of asphalt mixture based on non-suspend air construction

CHENG Dejin, YANG Kai, BAI Xuyao, WANG Jiandang YANG Baoquan

2022, 40(4):  38-44. 

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In order to study the influence of asphalt mixture temperature and finished product storage time on the aging performance of asphalt mixture in non-suspend air construction, this thesis analyzes the aging performance of AC-20 asphalt mixture under different temperatures (170 ℃, 180 ℃, 190 ℃) and different time lengths of the finished product storage (0 h, 4 h, 8 h, 12 h) through the high temperature rutting test, low-temperature trabecular bending test, water stability test and fatigue test. The results show that with the increase of mixing temperature or storage time, the finished product storage aging degree of mixture gradually increases; the dynamic stability of the aging asphalt mixture also increases, while the maximum bending tensile strain, residual stability, tensile strength ratio (TSR) and fatigue life (180 ℃) decrease, and the aging performance has the greatest influence on TSR of asphalt mixture. Considering the site construction temperature and durability of the asphalt mixture, the best mixing temperature of AC-20 is 180 ℃, and the storage time should not exceed 6.7 h.

Contrast of 3 deflection basin area index methods in the analysis of HWD test data

CHENG Guoyong, LU Xiaogang, ZHANG Yuhui, LIU Guoguang

2022, 40(4):  45-48. 

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The deflection basin area index methods of different forms lack systematic analysis and reliability verification based on actual engineering. This paper conducted deflection tests on rigid pavements of 5 airports in different regions of China, and analyzed the reaction modulus of the top surface of rigid pavements base of 5 airports using three common domestic deflection basin area index methods. The analysis results show that the reaction modulus of the top surface of the base obtained by the area index method with central deflection value is 14%-45% and 9%-75% higher than the value obtained by the improved area index method with central deflection value, and accords with the area index method without central deflection value. Among the 5 airports, the reaction modulus of the top surface of base obtained by the area index method with central deflection value is completely consistent with the pavement classification number(PCN) value announced by the five case airports, and is more reliable than the other two methods. The reason is that the area index method without central deflection can effectively avoid errors caused by the no -squeeze assumption in thin plate theory. The analysis results will provide references for the analysis of airport rigid pavement structure performance.

Research on intelligent passenger security check system and its efficiency

CHANG Min , LI Guangfei , LIN Tegao , LIU Yong , ZHANG Kuan , XU Xiaobo

2022, 40(4):  49-53. 

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This paper further studies the efficiency of airport passenger security check using intelligent passenger security system with different layouts. Based on the distribution of each passenger's passing time at airport security check, a simulation model is built with Anylogic. Security check efficiency is analyzed in different numbers of placement and sorting positions and at different conveyor belt speeds. The simulation results show that under the given parameters, when the conveyor belt speed is 0.2 m/s, 3 sorting bits and 4 placement bits are the optimal layout scheme. It will provide a direction for the layout optimization of intelligent passenger security system in the future.

Charging scheduling strategy of civil aviation electric special vehicles based on MOPSO

GAO Jianshu , CHEN Yu , ZHAO Zhimin

2022, 40(4):  54-60. 

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In view of the problem of airport flight support vehicle scheduling, the traditional research mainly focuses on fuel vehicles and is mostly based on manual experience and single vehicle with single flight service, which cannot be applied to the current electricization of special vehicles. The analysis of the business process of the flight ground support task along with the specific departure time of the airport flight can help to reduce the number of electric special vehicles in the airport and to shorten the charging time. The charging scheduling model of electric special vehicles is established and the multi-objective particle swarm optimization algorithm is used to build the model. The effectiveness of the model is verified in a domestic airport as a specific case. The experiment shows that this method can spare 5 special vehicles and reduce the charging time by 14.60%, which can solve the problem of charging scheduling of airport electric special vehicles and improve the operating efficiency of airport electric special vehicles.


Evaluation model of continuous flight safety capability of pilots

WANG Yonggang, HE Dingkun

2022, 40(4):  61-64. 

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In order to ensure that pilots maintain continuous safety records, the connotation of pilots continuous flying capability was defined based on literature analysis. Through civil aviation regulations and literature analysis, as well as expert interviews, continuous flight evaluation indicators were designed from the following 7 aspects: the physiological quality, psychological quality, cultural quality, professional quality, flying style, professional ethics and ideological quality. A questionnaire was designed on the importance of evaluation indicators, data analysis was made, and the weight of each indicator was determined. A fuzzy comprehensive evaluation method was used to construct the flight safety evaluation model. The study indicated that flying style had the greatest impact on the pilots’ continuous flight safety, professional ethics and ideological quality had a greater impact, followed by professional quality, cultural quality and psychological quality, and the physiological quality had the least impact.