Journal of Civil Aviation University of China

Aviation VHF data link secure communication technology

YUE Meng , ZOU Jiaxu , HU Yue , GUO Jiangxin , XUE Jiameng , ZENG Lingjin

2022, 40(3): 1-7.

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Aiming at the problems of plaintext transmission, entity authentication and message authentication system in the current aviation very high frequency(VHF) technology in message transmission, a more applicable solution of message encryption and digital authentication is proposed based on the data link of aircraft communication addressing and reporting system(ACARS) and domestic SM algorithm. The scheme encrypts the body part of the message, and uses the public key cryptographic algorithm to sign the cipher text to obtain the corresponding signature value. The ciphertext and signature value will be combined in a specific format and then filled into the body part of the original message. Experiments show that using the symmetric encryption algorithm to process the message is superior to the asymmetric one in terms of payload size, encryption and decryption time, etc., and is more suitable for aviation VHF data links. The introduction of encryption algorithm and digital authentication into aviation VHF data link communication technology can ensure the confidentiality and integrity of the data link, improve the security of message transmission, and is of great significance to aviation information security.

Analysis and research on fuel consumption based on trajectory data

CHEN Yujun, SUN Fanrong, XU Xueji, MU Yao

2022, 40(3): 8-14.

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With the rapid growth of the air transport industry, traditional flight procedure based fuel forecasting is no longer able to accurately calculate the amount of fuel carried by an aircraft, and therefore an accurate fuel forecast has become an important objective for the robust development of major airlines. In order to decide the quantity fuel consumption in a more scientific way, the trajectory data was firstly processed for use in the calculation of fuel consumption with the method based on the user manual for the BADA database, assuming a constant fuel consumption rate for each flight segment. The fuel consumption model for the descent and approach phase was then developed, and the analysis of the fuel consumption data was used to propose a recommended fuel carrying value for the airline for a particular flight phase. The proposed fuel consumption model was verified with the BADA database offered by Yunnan Sub-bureau, China Southwest Air Traffic Management Bureau.

Research on vehicle-induced vibration response caused by railway crossing airport tower

CHEN Yiting , FENG Dubei , LU Linxing , WANG Wei , YANG Jizhong , JIN Xuwei

2022, 40(3): 15-22.

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With the planning and construction of the airport integrated transport hub project, it is inevitable that high-speed railways and rapid subway will cross the airport tower at close range. The impact of vehicle-induced vibration on the tower has attracted attention from air traffic control, and there are currently no relevant cases and guidelines for railway crossing the tower for reference. This paper takes a domestic airport integrated transport hub as the research object, analyzes the vibration caused by 250 km/h high -speed railway and 120 km/h rapid subway passing the tower at close range, and evaluates the vibration response of the tower functional layer. The results show that when the high-speed railway crosses, the main frequency of tower vibration is in the range of 30-70 Hz, the maximum vibration levels of the elevator room and the functional area of the tower respectively reach 75.6 dB and 66.8 dB, exceeding the night vibration limit of 62 dB. When the rapid subway crosses, the vibration of each layer of the tower does not exceed the standard. When the high-speed railway and the rapid subway cross at the same time，the vibration response of the tower will be superimposed, the maximum vibration levels of the elevator room and the functional area of the tower control command floor respectively reach 79.5 dB and 67.5 dB，and the overall exceeding rate reaches 0.97%-28.2%. The research results provide reference and basis for subsequent railway construction into airport hubs.

Temperature control technology of L-shaped heat pipe + insulation board for airport runway in permafrost area

CHENG Guoyong, MA Shaomin, YANG Yiheng

2022, 40(3): 23-29.

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In accordance with the characteristics of the airport runway in permafrost area and the special requirements of the flight area, a technical solution for obliquely inserted L-shaped heat pipe + insulation board temperature control was proposed. First, the cooling effect of industrial pure aluminum, Q235 carbon steel and 304 stainless steel heat pipes of three different materials was tested and compared, and the results showed that the cooling effect of industrial pure aluminum heat pipes was the best. Then, the L-shaped pure aluminum heat pipe was used to test and analyze the influence of the slope angle, bending angle, thickness and buried depth of the insulation board on the temperature control of the roadbed. The test shows that the range is 10°-45°, the larger the slope angle of the evaporation section, the better the cooling effect. Under the quantitative index of gradient ratio with a 25° slope angle of the evaporation section, the cooling effect and economic optimization can be achieved simultaneously, so the evaporation section slope angle is 25°; the bending angle of the heat pipe has little effect on the cooling rate. At the same depth, the temperature difference ranges from 0.1 ℃ to 0.3 ℃ and the bending angle is 120°; the soil layer of 2 cm insulation board has the highest temperature recovery rate, 3 cm and 5 cm boards are close in recovery rate, 8 cm is the lowest. To be economic, a 3 cm thick insulation board is buried at the depth of 10 cm, 20 cm, 30 cm respectively, and the soil temperature change is compared. The soil temperature recovery rate of 10 cm buried depth is 0.02%-0.71% higher than that of 20 cm buried depth, 0.65%-1.71% higher than that of 30 cm buried depth, while the recovery rate at 20 cm buried depth is 0.62%-1.62% higher than that at 30 cm buried depth. The insulation effect of the board at 30 cm buried depth from the overlying gravel layer is relatively optimal.

Dynamic analysis of drainage conditions based on the requirements of reconstruction and expansion of the airfield area facilities

ZHAO Fangran, SU Shoutao, CAO Yuanbing

2022, 40(3): 30-34.

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In view of the previous design of the drainage system in the flight area of China′ s airports, the rainstorm recurrence period selected was too small, resulting in insufficient water delivery capacity of the drainage facilities under heavy rainstorms. According to the Specifications for Aerodrome Drainage Design, the storm water management model (SWMM) simulation software is used to simulate and analyze the rainfall and runoff in the flight area of Wenzhou Longwan International Airport, and to discuss the demand law for the spatial parameters of drainage facilities when the rainstorm recurrence period is large. The analysis results show that in the reconstruction and expansion of the airport, the rainstorm recurrence period of P = 5 a should be selected, and the spatial parameter requirements of the specification should be met; for the utilization of existing facilities, the recurrence period of the peak year should be selected for check as much as possible. And measures such as increasing the width of the existing pipe trenches and increasing the parallel diversion can be used to improve the drainage effect, thereby laying a foundation for increasing the rainstorm recurrence period of the drainage facilities. The research results can provide a reference for the comprehensive improvement of the drainage system function of the airport flight area.

Flight delay prediction model based on CART algorithm

WANG Hui , ZHANG Wenjie , LIU jie , CHEN Linfeng , LI Zenan

2022, 40(3): 35-40.

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Aiming at the flight delay problem of civil aviation airliners, this paper constructs a flight delay prediction model based on random forest model and classification regression decision tree(CART) algorithm, on which a large amount of training are conducted by using the real data set from large China airports. With the training results of Logistic regression algorithm, K-nearest neighbor(KNN) regression algorithm and decision tree algorithm, and with the fitting results, it is concluded that this method can deal with high latitude data with good generalization ability, and reduce the possibility of over fitting. The fitting degree R2 of the model can reach 0.83.

Risk identification and interactive risk assessment of 4C inspection based on HHM-RFRM

WANG Yonggang , ZUO Beichen

2022, 40(3): 41-46.

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In order to identify risks accurately and effectively control the interaction of risks in maintenance, the improved hierarchical holographic model-risk filtering, rating and management(HHM-RFRM) are adopted to conduct interactive risk assessments on selected key risk categories, and to identify risks from planning and technical aspects, as in the case of 4C inspection. The results show that planning risks include planning control and construction preparation, and that technical risks include implementation and release. The interactive risk assessment model shows that when the unreasonable arrangement of staff interacts with the crossed maintenance work, nonstandard maintenance behaviors and the insufficiency of qualified staff, the risk is the greatest.

Automatic classification of civil aviation safety information based on text augment

CUI Zhenxin, ZHANG Zhuoyan

2022, 40(3): 47-53.

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Aiming at the problem of insufficient samples in the application of automatic classification of civil aviation safety information, an automatic classifier is developed, based on the bidirectional encoder representations from transformers (BERT) pre-training model, easy data augment(EDA) and support vector machine(SVM) algorithms.This paper categorizes the incident information into data subsets of different orders of magnitude according to the orders of magnitude of information of single incident type and analyzes the model performance of data-sets in different scale, especially for the small data-sets. The results show that the F 1w value is increased by 31.21 % , 9.66 % and 3.35 % when the orders of magnitude of single incident type are ten -scale, hundred -scale and thousand -scale respectively, indicating a significant improvement of model performance. Therefore, by text enhancement algorithm, the automatic classifier trained in relatively small data-sets has a good effect, and is applicable to automatic classification and processing for civil aviation safety information.

Analysis on security risk of aviation cold chain logistics by GO-FLOW method

WEI Ran , CHEN Bingcheng , LI Yanhua

2022, 40(3): 54-58.

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Based on combing the work-flow of aviation cold chain logistics, this paper calculated the system risk in the process of transportation using the GO-FLOW method, identified and analyzed the risk degree of each link of air cold chain logistics transportation process. The calculation results showed that three key factors significantly affected the safety of aviation cold chain logistics transportation system, such as the loading/unloading in the parking apron, the airport security inspection and two-times ground transportation in the process. Finally, with the above research and a lot of work practices, some suggestions on risk avoidance in cold chain logistics in the process of air transportation were proposed.

Design of the flaps actuation system architecture based on design structure matrix

YANG Jianzhong, CHEN Bang, SUN Xiaozhe

2022, 40(3): 59-64.

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With the enhancement of the function of the flight control system, the flap actuation system is required to perform more additional functions to improve flight efficiency. Taking the A320 flap actuation system as a reference, the initial flap actuation system matrix model is created based on the function-driven design structure matrix, with which a few modifications are made and new functional elements are introduced. The functional architecture model of the system is obtained using clustering algorithm, and the flap actuation system architecture that meets the multi-functional requirements is developed. On the basis of the initial architecture, the new architecture can realize the independent control and drive of the flap after minor changes. Therefore, the architecture of the flap actuation system can be designed effectively based on the design structure matrix.

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