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    Analysis of the development trends of hyperspectral imaging technology based on
    bibliometrics
    CHEN Daa , JI Sibob , CHEN Ying , ZHU Lin , GUO Xianga , PEI Linlinc
    Journal of Civil Aviation University of China    2025, 43 (6): 1-8.  
    Abstract1233)      PDF(pc) (18460KB)(150)       Save
    To understand the research situation of hyperspectral imaging technology and hyperspectral remote sensing in
    the past 20 years at home and abroad, this article adopts the bibliometric visualization software VOSviewer to
    quantitatively analyze the research papers of hyperspectral imaging technology in the Web of Science (WoS)
    database and CNKI database from 2003 to 2022. The results indicate that the number of papers related to hyperspectral imaging technology in the CNKI database has grown relatively slowly. In the past five years, Chinese
    scholars have ranked first in the number of publications in the field of hyperspectral imaging technology and
    have closely cooperated with researchers from multiple countries in the WoS database. The keyword analysis of
    the relevant literature retrieved from the two databases shows that data analysis and image processing in hyperspectral imaging technology are the current research hotspots, and experts and scholars from various countries
    have applied deep learning methods in this field. With the progress of technical means, hyperspectral data
    analysis and image processing need more cross-integration of multiple disciplines to face the increasing demand for data processing.
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    Adaptive typical trajectory generation based on geometric algebra
    JIAO Weidong , LI Chunyang, , WU Haobo , LI Taiyu
    Journal of Civil Aviation University of China    2025, 43 (6): 38-45.  
    Abstract1226)      PDF(pc) (2852KB)(141)       Save
    By analyzing the performance of density-based spatial clustering of applications with noise (DBSCAN) and fuzzy
    C-means (FCM) clustering, a fast adaptive typical trajectory generation method based on geometric algebra is
    proposed. Firstly, the K-means clustering algorithm is used to normalize the flight operation time. Then, lever aging the superior capabilities of geometric algebra in spatiotemporal representation and computation, geometric
    algebraic descriptions are formulated for trajectory turn determination, DBSCAN clustering and FCM clustering.
    Finally, in the geometric algebraic space, DBSCAN clustering and FCM clustering are carried out adaptively to
    form typical trajectories of turn motion state and straight motion state respectively. Experimental results show
    that the adaptive typical trajectories achieve over 30% faster generation speed compared to conventional Euclidean space methods.
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    Research on the development strategy of Shanghai′s third airport under the
    "one-city-three-airport" model
    LI Longhai , LI Benzhao , LIU Zhaobo
    Journal of Civil Aviation University of China    2025, 43 (6): 46-53.  
    Abstract1159)      PDF(pc) (2424KB)(128)       Save
    To explore the development direction of a one-city-three-airport system in China and promote the coordinated
    development of Shanghai as an aviation hub, this paper constructs an evaluation index system for multi-airport
    development models in the context of one-city-three-airport systems, comprising five first-level indicators
    and eleven second-level indicators. Subjective and objective weights are derived using the G1 method and the
    entropy method, respectively, and are combined via a range-maximization combination-weighting procedure; the
    various one-city-multi-airport development models are then evaluated using the technique for order preference
    by similarity to ideal solution (TOPSIS). Results indicate that Shanghai′s current one-city-two-airport system
    exhibits significant advantages in cargo and mail throughput and performs well in inter-airport ground-accessibility and noise-impact metrics, but lags in route-network connectivity. Drawing on lessons from international
    one-city-three-airport systems, the study proposes three strategic options for a third Shanghai airport: a domestic
    trunk passenger hub airport to divert selected flights from the existing airports; a low-cost carrier (LCC)-oriented
    airport to attract price-sensitive travelers; and an auxiliary LCC facility to accommodate overflow passenger and
    cargo demand from the current airports.
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    An image interference suppression method for zero-IF architecture navigation
    receivers
    Journal of Civil Aviation University of China    2025, 43 (6): 15-23.  
    Abstract1265)      PDF(pc) (5521KB)(128)       Save
    To address the image interference issue in zero intermediate frequency (zero-IF) architecture navigation receivers,
    this paper proposes a suppression method based on a complex analytic bandpass filter. The proposed method is
    used to optimize the parameters of the receiver′s radio frequency (RF) front-end to achieve spectral separation
    between the image interference and the navigation signal, followed by the design of a complex analytic bandpass
    filter to suppress image interference. First, this paper theoretically demonstrates that in-phase/quadrature-phase
    (I/Q) mismatch during quadrature downconversion is the fundamental cause of image interference. Subsequently,
    the impact of image interference on system performance is evaluated under the space-time minimum power antijamming algorithm. Based on this analysis, the proposed complex analytic bandpass filter is employed to suppress
    image interference, followed by joint processing with the space-time minimum power anti-jamming algorithm.
    Simulation and measured results validate that the proposed method effectively enhances the anti-jamming performance of the navigation receiver.
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    Air traffic flow forecast in the control area based on the four-stage method
    MA Lan , REN Jingjing ,
    Journal of Civil Aviation University of China    2025, 43 (6): 31-37.  
    Abstract1006)      PDF(pc) (3360KB)(128)       Save
    In order to solve the problem of the mismatch of traffic flow distribution across airways and the unfair allocation
    of airspace resources resulting from independent air traffic flow forecasts conducted by individual air traffic control bureaus, this study proposes a forecasting method based on the four-stage prediction theory for estimating
    both overall air traffic flow in the control area and the traffic flow distribution across its internal airways. The
    grey prediction model was employed to forecast the number of flights from source airports within the control area.
    A double-constrained gravity model was established to estimate the distributed air traffic flow between origin destination (OD) pairs associated with these airports. The multinomial Logit model was then applied to predict
    the traffic flow distribution across airways between the OD pairs, and the forecasted air traffic flow for the control
    area was obtained by aggregating these distributed flows. The method was validated using the Xi′ an Regional
    Control Area as a case study. The results show that this method can effectively realize the air traffic flow forecast
    within the control area while ensuring consistency in the traffic flow distribution across airways. It can serve as a
    reference for the unified forecast of both traffic flow distribution across airways and control area air traffic flow at
    the national level.
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    Research on the identification of factors influencing flight gate boarding
    rate at airports
    MAO Hongli , , LUO Qian, , LIU Hong , ZHOU Wei , LU Yanhong,
    Journal of Civil Aviation University of China    2025, 43 (6): 61-67.  
    Abstract1098)      PDF(pc) (22530KB)(123)       Save
    To identify key factors influencing the flight gate boarding rate at airports, an indicator system was established
    based on flight volume and structure, flight operations efficiency, airport operational efficiency, and contact stand
    resources. The Spearman correlation coefficient and grey relational analysis (GRA) were used to analyze the correlation and impact significance between flight gate boarding rate and multi-dimensional indicators in terms of
    their absolute values and monthly average change rates, and the correlation distribution characteristics of the factors influencing the flight gate boarding rate and the ranking of multivariate collaborative influencests are obtained. Results show that airports with higher flight gate boarding rate generally have fewer overnight flights,
    shorter arrival delays, and a higher proportion of contact stands. Originating and overnight flights′ gate boarding
    rate changes are highly synchronized with the overall rate, significantly boosting the airport′s total flight gate
    boarding rate. Improving flight punctuality rate, shortening ground support time, and increasing contact stand resources all have a positive effect on the improvement of flight gate boarding rate. The ranking of factors influencing flight gate boarding rate from highest to lowest is: average daily turnover of contact stands, actual turnaround
    time, overnight flight proportion, departure delay, daily contact stand flight load ratio, daily number of contact
    stands used by C/D-class aircraft, airport departure clearance punctuality rate, and daily contact stand count.
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    Text analysis and multidimensional perspective of China′s low-altitude economic
    policy based on a three-dimensional framework
    JING Xiuli, WANG Zhe
    Journal of Civil Aviation University of China    2025, 43 (6): 75-82.  
    Abstract1099)      PDF(pc) (1487KB)(123)       Save
    As a national strategic emerging industry, the construction of the policy system for low-altitude economy is of great
    significance for the transformation of old and new driving force, optimization of airspace resources, and modernization of governance capabilities. Based on a systematic review of 74 national and regional low-altitude economic
    policy documents, a three-dimensional analysis framework of “policy tools-industrial ecology-participating entities” was constructed. The content analysis method was used to analyze 1 806 reference points and explore the synergistic relationships and cross effects between various dimensions in depth. Research has found that the overall
    low-altitude economic policy tools in China exhibit a structural preference of “supply led, environment support,
    and low demand”. The ecological attention to the four major industries in the low-altitude sector is relatively balanced, but the coordination between policy tools and industrial ecology needs to be strengthened. There are some
    adaptation differences between policy tool configuration and subject capabilities, and multi-subject collaborative
    governance presents industrial heterogeneity. The current policy system still faces many challenges in promoting
    low-altitude economy to achieve economic benefits, including incomplete market-oriented mechanisms and unclear profit models. The research suggests implementing systematic optimization of policies and management from
    six aspects, including improving the policy system, optimizing the tool structure, strengthening industrial collaboration, building a diversified governance mechanism, improving policy implementation guarantees, and narrowing regional industrial gaps, in order to promote the transformation of low-altitude economy from a “lively start” to a “substantial profit”stage and provide theoretical support and policy reference for high-quality development of low-altitude economy.
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    Chinese aviation national civil servant exam assessment using large language model
    YANG Kaijie , QIN Xuefenga , MO Jimaob , WANG Chuwei , LI Guanlina , DING H.Q. Chris , CAI Yuanzhea
    Journal of Civil Aviation University of China    2025, 43 (6): 88-96.  
    Abstract933)      PDF(pc) (4223KB)(123)       Save
    This paper systematically evaluates and analyzes the performance of five large language models (LLMs) , including ChatGPT-4o on the Chinese national civil servant exam (NCSE). The study selected NCSE past exam
    papers from 2022 to 2024, input the questions into the five LLMs using a predefined standardized query format,
    recorded their outputs, and calculated their accuracy rates to assess their overall capabilities. The experimental
    results show that the total scores for DeepSeek -V3, DeepSeek -R1, ChatGPT -4o, Gemini -1.5 Flash, and
    ERNIE Bot-4.0 Turbo are 145.20, 145.41, 127.47, 107.56, and 86.40, respectively, except for ERNIE Bot-4.0
    Turbo, all models scored higher than the average human candidate score of 93.50. Among them, DeepSeek-V3
    and DeepSeek-R1 achieved scores within the high-score range of NCSE. Furthermore, this paper delves into
    the strengths and weaknesses of the five LLMs, provides a detailed comparison of their performance across different question types, such as common sense judgment, verbal comprehension and expression, quantitative relationships, judgment and reasoning, and data analysis, and summarizes typical error patterns when handling complex logical reasoning and multi-step calculation problems.
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    Research on coordinated slot parameter profiles based on flight delay
    prediction under multiple weather patterns
    GAO Wei , PANG Dingying,
    Journal of Civil Aviation University of China    2025, 43 (6): 24-30.  
    Abstract1262)      PDF(pc) (4207KB)(122)       Save
    Constructing a reasonable 18—24 h coordinated slot parameter profile for busy airports that aligns with normality
    expectations, used for publishing capacity and facilitating seasonal slot adjustments, remains an unresolved issue
    in aviation slot management. This paper develops a regression prediction model for slot structure using historical
    flight and weather data, employing K-means clustering and partial least squares regression, while applying
    ensemble learning to forecast flight delay levels. The results show that random forests exhibit good performance in
    both regression and prediction, and can combine flight delay predictions to obtain the upper and lower limits of
    the coordinated slot parameter profile as the slot coordination parameter interval. The results are verified through
    simulation, ensuring that the flight schedule within this interval maintains an average delay level of less than 15
    min, leading to the proposal of recommended slot coordination parameters. This paper provides refined decision support information for relevant departments in slot management and air traffic flow management during different
    strategic and tactical periods, as well as for airports and airlines in evaluating delay risks, adjusting slot arrangements, allocating capacity, and planning support resources.
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    Research on UAV safety supervision strategies based on a four-party
    evolutionary game model
    ZHANG Qingsong a, b , FAN Kuanb
    Journal of Civil Aviation University of China    2025, 43 (6): 68-74.  
    Abstract1121)      PDF(pc) (2465KB)(120)       Save
    In order to improve the supervision and management efficiency of civil unmanned aerial vehicles (UAVs) in China, reduce their accident rate, and further ensure the safety of general aviation, this study applies evolutionary
    game theory to construct a four-party evolutionary game model for the full-process supervision of UAV market
    circulation. The model involves multiple stakeholders, including the Civil Aviation Administration of China
    (CAAC) safety supervision department, local governments, UAV enterprises, and UAV operators. The study explores the strategy selection paths, evolutionary trends, and system stability and control scenarios under the influence of different strategies, and proposes reasonable regulatory strategies for civil UAVs in China. The results indicate that significantly improving UAV regulatory efficiency and reducing UAV accident rates require strengthening accountability for UAV enterprises and adopting a hierarchical supervision strategy.
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    Analysis of the effect of ice ridges on the aerodynamic and control characteristics
    of ruddered airfoils
    YANG Jianzhong , ZENG Xiangtao, , XU Zhaoke , YANG Shibin
    Journal of Civil Aviation University of China    2025, 43 (6): 9-14.  
    Abstract1352)      PDF(pc) (7411KB)(119)       Save
    The formation of ice ridges above the wing by icing of supercooled large droplet (SLD) can seriously affect the
    aircraft flight safety. In order to investigate the effects of ice ridges on the aerodynamic and control characteristics
    of ruddered airfoils, numerical simulations were carried out using computational fluid dynamics (CFD) for ruddered airfoils under different ice ridge heights. Simulation results show that ice ridges cause a reduction in the lift
    coefficient, an increase in the drag coefficient and a significant reduction in the rudder control efficiency of the
    airfoil; in this example, the airflow over the upper surface of the airfoil is completely separated at an ice ridge
    height of k/c = 0.013 9 at angle of attack α = 4°, resulting in a rudder control efficiency loss of over 40% and a significant degradation of the airfoil′s aerodynamic and control characteristics.
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    A study of budget and cost management strategies for civil aviation information
    systems project portfolios
    LIU Jie, LI Xue, XUE Siqi, AN Yuan, RAN Xia, YANG Lisong, ZHANG Xinxin, WANG Qing
    Journal of Civil Aviation University of China    2025, 43 (6): 83-87.  
    Abstract1137)      PDF(pc) (2739KB)(117)       Save
    While substantial research has been conducted in both academic and industrial circles on refined project cost
    management, existing studies tend to focus more on refining details with limited practical implementation.
    Moreover, their application scenarios are largely confined to traditional sectors such as construction engineering,
    offering limited adaptability and guidance for enterprises in civil aviation information systems. To address this gap,
    this paper investigates large-scale project portfolios in civil aviation information systems and develops refined
    budget and cost management strategies based on practical exploration. By establishing a comprehensive process
    management system encompassing "budget formulation-budget decomposition-cost accounting-cost control", a
    closed-loop management mechanism is formed. This system is characterized by detailed depth, fine granularity,
    and strong operability, providing targeted guidance for practitioners in civil aviation and filling the research gap in
    refined budget and cost management for large-scale project portfolios in the civil aviation information systems.
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    Optimization and prediction model of apron floodlighting based on PSO-BP neural
    network
    ZHENG Meichun , SHEN Liangzhong , LI Yue , CAI Jing
    Journal of Civil Aviation University of China    2025, 43 (6): 54-60.  
    Abstract1099)      PDF(pc) (7187KB)(112)       Save
    The design of apron floodlighting is influenced by numerous factors, which affect the efficiency and safety of
    floodlighting. In this study, 315 sets of lighting schemes were simulated in DIALux evo software to develop an illuminance prediction model. Horizontal illuminance, vertical illuminance, uniformity, glare rating, and zonal illuminance were used as model inputs, while the installation height of high-mast lights, number of LEDs, and
    vertical tilt angle were used as model outputs. A prediction model based on particle swarm optimization (PSO)
    and back propagation (BP) neural network was constructed and compared with a model built using BP neural
    network. The results show that the proposed PSO-BP neural network is more efficient and has higher model fitting accuracy than the BP neural network algorithm, and it avoids the problem of local optima inherent in the BP
    neural network algorithm. The predicted illuminance results for the preset scenes using the established optimized
    model were highly consistent with the simulation test results, indicating that the model has good predictive accuracy in engineering applications.
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    LightGBM-based phased multimodal trajectory prediction method
    Journal of Civil Aviation University of China    2026, 44 (1): 1-9.  
    Abstract2142)      PDF(pc) (1224KB)(105)       Save
    as insufficient data diversity, dificulty in acquiringcritical data, high model complexity and poor generalization, this paper proposes a light gradient boosting ma-chine (LightGBM)-based phased multimodapn method (LightGBM-based PMTPM). Themethod can intelligently identify the flight phabased on data from the aircraft's own sensors,predict the 4D trajectory and real-time qualig an onboard computer. Experimental resultsshow that, during all flight phases, the LightGoutperforms the back propagation neural net-work-based phased multimodal trajectory predN-based PMTPM) in predictive performance,with root mean square error (RMSE) reductions of 64.86%, 13.15%, 80.88%, 77.46%, 86.45%, 3.46% and19.22%, respectively. The average evaluation time of the LighiGBM-based PMTPM is 59.890 ms, meeting theaccuracy and real-time requirements for 4D trajectory prediction of aircraft.
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    Prediction of taxi-out time for large airports based on machine learning
    LI Nan , WU Longtian, , HAO Jinbiao 袁XU Rui
    Journal of Civil Aviation University of China    2026, 44 (1): 17-24.  
    Abstract1039)      PDF(pc) (1742KB)(78)       Save
    To improve the accuracy of taxi-out time prediction for large airports, this paper first identifies common featurevariables of taxi-out time at large airports through Pearson correlation coefficient analysis. Then, it comparespredictions of taxi-out time at Bejing Daxing International Airport and Hong Kong Chek Lap Kok InternationalAirport using classical machine leamning and deep leaming models. Experimental results show that, except for therandom forest (RF) model, the prediction results of each model are relatively close and perform well, with an av-erage prediction accuracy of 88.485%, an average prediction accuracy of 78.605% within 3 minutes, and an av-erage prediction accuracy of 93.867% within +5 minutes. The gradient boosting regression tree (GBRT) and sup-port vector regression (SVR) models outperform the others and are the best-performing models, and for the samebest-performing model, the prediction results between the two airports show litle difference. The common featurevariables of taxi-out time proposed in this paper can accurately predict taxi-out time at large airports. Classicalmachine leaming models achieve better prediction performance than deep leamning models, and the best-per-forming model demonstrates transferability.
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    Research on the robustness of China忆s all-cargo aviation network based onnetwork efficiency
    SHI Xuegang a , WU Linjiang b
    Journal of Civil Aviation University of China    2026, 44 (1): 32-39.  
    Abstract1259)      PDF(pc) (2110KB)(77)       Save
    Under the new development pattern, it is particularly important to enhance the risk resistance capability of China'sall-cargo aviation network. This paper first constructs an undirected weighted topological network structure basedon China's all-cargo air route data in 2023, then identifies key nodes and edges in the topological network usingdifferent methods, and finally explores the changing trends of network efficiency of the all-cargo aviation networkunder different attack strategies. The results show that the node degrees in both China's domestic all-cargo avia-tion network (referred to as the domestic network) and international all-cargo aviation network (referred to as theintemational network) follow an exponential distribution. In identifying key nodes in the domestic network, thePageRank algorithm outperforms the comprehensive degree method but is comparable to the node degree method,with both reaching the collapse threshold of network efficiency when the node failure ratio is 40%. The interna-tional network generally has weaker risk resistance capability than the domestic network, especially showinggreater vulnerability under edge failure scenarios. Based on the findings of this study, it is recommended toincrease the frequency of existing international all-cargo fights and continuously launch new intemational all-cargo air routes to enhance the robustness of the intemational network and the overall network's risk resistancecapability.
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    Research on the driving factors of airport throughput under different regional characteristics
    LI Longhaia , ZHU Y ufenga, , LIANG Zhixingb
    Journal of Civil Aviation University of China    2026, 44 (1): 25-31.  
    Abstract1550)      PDF(pc) (1144KB)(71)       Save
    To investigate the driving mechanisms of airport throughput under different regional characteristics, this papercarries out an analysis using an integrated approach combining Pearson correlation coefficients with entropy-weighted grey relational degree. First, the data of passenger as well as cargo and mail throughput data from trans-port airports in the 31 provincial-level administrative center cities of China between 2006 and 2023 were col-lected. Second, 9 categories of primary driving factor indicators, including gross regional product (GRP), peo-ple's living standards, tourism, ete., and 19 secondary driving factor indicators were selected, and Pearson cor-relation coefficients were used to select driving factors highly correlated with airport throughput. Finally, the en-tropy-weighted grey relational degree method was applied to the selected driving factors for weighted analysisand relational ranking, and the top five primary driving factor indicators from the ranking results were identifiedas key driving factors of airport throughput, with Tianjin Binhai Intemational Airport serving as a case study tovalidate the model's effectiveness. The results showed that the impacts of various driving factors on airportthroughput differ significantly, indicating that airports in provincial-level administrative center cities across dif-ferent regions exhibit regional characteristics. The research results of this paper can provide reference for futureplanning and sustainable development of airports with different driving patterns.
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    Fuzzy comprehensive evaluation of terminal area operational efficiencybased on interval numbers
    XIE Chunsheng , GAO W anqi, , LU Fei
    Journal of Civil Aviation University of China    2026, 44 (1): 10-16.  
    Abstract1954)      PDF(pc) (1111KB)(70)       Save
    determined from the perspective of interval numberlistances, and weights are calculated using the ordered weighted averaging (OWA) operator combined with nor-nal distribution. Finally, the operational efficiency of terminal areas at domestic airports is evaluated based onthe established evaluation system. Taking four typical airports in the Beijing-Tianjin-Hebei region, namely Bei-jing Capital Intemational Airport, Beijing Daxing Intemational Airport, Tianjin Binhai International Airport, aneShijiazhuang Zhengding Intemational Airport, as examples, the terminal area operational efficiency is evaluated,resulting in ratings of good, good, poor, and poor, respectively. The research results show that the evaluation out-comes align well with the actual operating conditions of the terninal areas, verifying the feasibility of the methodproposed in this paper.
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    Modeling the medium access control protocol of VDL Mode 2
    LIU Haitao, DONG Qinzhuo, DA I Y ongzhang
    Journal of Civil Aviation University of China    2026, 44 (1): 80-85.  
    Abstract1679)      PDF(pc) (1742KB)(69)       Save
    VHF Data Link (VDL) Mode 2 is a critical infrastructure of the civil aviation air traffic management (ATM) sys-tem. The future ATM system will adopt the trajectory -based operations (TBO) paradigm, which imposes morestringent requirements on VDL Mode 2. To enhance the performance of VDL Mode 2, this paper develops a simu-lation model of its medium access control (MAC) protocol using the optimized network engineering tools (OPNET).The protocol employs the p-persistent carrier sense multiple access (p-CSMA) mechanism. Through extensivesimulations, the influence of the persistence parameter p on system throughput, transmission delay, and frameloss rate is systematically analyzed. The results show that p has a significant impact on these three performancemetrics, and a clear trade -off exists among them. By appropriately selecting the value of p, it is possible toachieve high throughput while maintaining low transmission delay and frame loss rate, thereby satisfying the reli-ability and real-time communication requirements of TBO operations.
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    Research on the temporal and spatial variation characteristics of runway foundation temperature at Mohe Airport
    WU Danze , FENG Li
    Journal of Civil Aviation University of China    2026, 44 (1): 53-59.  
    Abstract1631)      PDF(pc) (2768KB)(59)       Save
    Airport construction in permafrost regions is a worldwide technical challenge, lacking mature experience and in-volving significant engineering risks, thus urgently requiring the identification of the evolution characteristics ofpermafrost ground temperature to guide airport engineering practices in cold regions. This paper is based on threeintermittent ground temperature monitoring datasets collected over 17 years at Mohe Gulian Airport (referred to asMohe Airport), and analyzes the temporal and spatial variation characteristics and spatial dispersion of siteground temperatures by integrating muliple factors such as surface vegetation removal, construction disturbance,and climate warming. The study found that the original permafrost has significantly degraded, with the extents ofwam permafrost and deep seasonally frozen ground expanding; ground temperature variations exhibit depth-de-pendent stratified heterogeneity, and measurements at identical monitoring points show pronounced spatial dis-persion. The research findings provide key scientific support for airport design and construction in global per-mafrost and seasonally frozen ground regions, and hold important theoretical and practical value for advancingmajor infrastructure development in cold regions.
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    Applicability analysis of airport runway roughness evaluation using IRIbased on aircraft vibration response
    QI Lin, CHENG Meipeng, Y ANG Shuai, WANG Qiang
    Journal of Civil Aviation University of China    2026, 44 (1): 47-52.  
    Abstract1218)      PDF(pc) (1969KB)(57)       Save
    Airport runway roughness has an important influence on the stable operation of aireraft on runways. The interna-tional roughness index (IRD) is a commonly used indicator for evaluating airport runway roughness, but IRI was o-riginally proposed as an indicator for highway roughness evaluation, and current research on the applicabilityanalysis of using IRI to evaluate airport runway roughness is insufficient. This paper establishes a virtual proto-type model and verifies its reliability. Aircraft taxiing simulation analyses are conducted separately on heteroge-neous runways with the same IRI, on runways characterized as smooth by IRI, and on runways with measured el-evation information, to obtain aircraft vibration response data and investigate the correlation between IRI and air-craft vibration response. The results show that on heterogeneous runways with the same IRI, aircraft vibration re-sponses exhibit completely different results, and on runways characterized as smooth by IRI, the correlation be-tween aircraft vibration response and IRI is very strong. The correlation between IRI obtained from different take-off lengths and the root mean square of vertical accelerations at the aireraft center of gravity and cockpit is poor,and the correlation between measured IRI and the root mean square of vertical acceleration in the aircraft cockpitis also poor. Therefore, using IRI to evaluate airport runway roughness is difficult to reflect the true vibration re-sponse of aircraft, it is recommended to establish a runway roughness evaluation indicator capable of identifyingthe time and location when unsafe vibrations occur during aircraft taxing, based on a comprehensive considera-tion of aircraft type, its vibration response and taxiing speed.
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    Research on the ecological and environmental impacts and control measures ofspent airport deicing fluids
    ZHAO Xiaohui , ZHANG Panwei , YANG Jia , WAN Xiaohong , ZHANG Haiyan
    Journal of Civil Aviation University of China    2026, 44 (1): 68-72.  
    Abstract1043)      PDF(pc) (995KB)(57)       Save
     To systematically address the impacts of spent deicing fluids on the ecological environment of airports and effec-tively respond to the core challenges posed by pollution from spent deicing fluids to green operational manage-ment at airports, this paper systematically analyzes the composition, application scale, and discharge characteris-tics of spent deicing fuids at airports both domestically and internationally. It elucidates the complex ecologicaland environmental impacts of spent deicing fluids on airports and surrounding water bodies, such as increasedorganic loading, decreased dissolved oxygen, elevated salinity, as well as soil salt accumulation and changes inphysicochemical properties, especially the environmental pollution caused by persistent organic pollutants intheir additives. Based on the above analysis, the paper proposes comprehensive management strategies tostrengthen effective collection, treatment, and recycling of spent airport deicing fluids; it also proposes developingefficient treatment technologies, further exploring economically feasible recycling routes, and providing scientificsupport for pollution prevention and control of spent deicing fluids and for sustainable development at airports
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    Complexity analysis of time series based on order entropy
    DONG Keqiang a, b , LIU Jingna b
    Journal of Civil Aviation University of China    2026, 44 (1): 91-96.  
    Abstract1833)      PDF(pc) (2198KB)(57)       Save
    Traditional information entropy has certain limitations in analyzing the complexity of time series, as it does nottake into account the sequential relationship among successive elements. To address this issue, this paper pro-poses an improved entropy. First, order entropy is defined to measure the uncertainty of the sequence of succes-sive elements, and joint order entropy and average order entropy are further introduced to study the complex de-pendency between two time series. Then, these entropy -based measurement methods are applied to random se-quences following different distributions and to performance parameter sequences of aircraft engines to verify theeffectiveness of the improved method. The results show that the improved entropy can effectively measure the un-certainty in time series, and the influence of time delay on order entropy and average order entropy is relativelysmall.
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    New constructions of optimal and asymptotically optimal codebooks
    GAO Y ou, , XIE Mingyue , WANG Gang
    Journal of Civil Aviation University of China    2026, 44 (1): 86-90.  
    Abstract1779)      PDF(pc) (1027KB)(55)       Save
    Codebooks are signal sets with low mutual correlation. Those codebooks meeting the Welch bound or the Lev-enshtein bound are mainly used to distinguish signals from different users in code-division multiple -access(CDMA) systems, and can also be applied in compressed sensing, coding theory, and quantum computing. Thispaper presents two new constructions of optimal and asymptotically optimal codebooks with respect to the Lev-enshtein bound. Firstly, a new class of optimal codebooks with respect to the Levenshtein bound is constructedusing design-theoretic object nets and Hadamard matrices. Secondly, a new class of asymptotically optimal codebooks with respect to the Levenshtein bound is constructed using permutation functions over finite fields.Parameter comparisons demonstrate that the construction parameters and methods for these two classes ofcodebooks represent novel contributions.
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    Dynamic simulation and optimization design of the frame for a small aircrafttowbarless towing vehicle
    ZHU Hengjia, WANG Xinyue
    Journal of Civil Aviation University of China    2026, 44 (1): 73-79.  
    Abstract1060)      PDF(pc) (2990KB)(54)       Save
    The frame of the towing vehicle, as the core load-bearing structure of the aireraft towbarless towing vehicle, di-rectly determines the safety of the aircraft towing and taxiing system through its strength and stiffness. This paperdesigns a frame structure for the towing vehicle tailored to the towing requirements of small aircraft and developsa corresponding dynamic simulation model to thoroughly investigate the effects of towing speed and road obstaclebump height on frame loading. Finite element simulation, structural optimization design, and experimental vali-dation reveal that when the rear wheels of the towing vehicle encounter an obstacle bump, symmetric and equalmaximum forces are generated on the left and right side beams of the frame, and these forces increase significant-y with increasing towing speed. Under the condition of a towing speed of 30 km/h and an obstacle bump height of30 mm, the frame loading and stress level reach their peaks, causing local stress values to exceed the material'sallowable stress limit. After structural optimization, the frame's load-carrying capacity is improved by 86.31%without exceeding the allowable stress, and the accuracy of the optimized model is validated by experimental da-a. This paper can provide important theoretical basis and practical reference for the subsequent design and opti-mization of towing vehicle frames.
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    Quantitative analysis of damage to airport taxiway bridges based on structural response parameters
    ZHANG Y uhui , GAO Yichi , ZHAO Y uanyuan
    Journal of Civil Aviation University of China    2026, 44 (1): 40-46.  
    Abstract1056)      PDF(pc) (2638KB)(53)       Save
    To eficiently analyze the safe passage capacity of taxiway bridges under damage conditions and investigate theirresponse parameters under different damage scenarios, this paper adopts a numerical simulation method to es-tablish an aircraft-taxiway bridge coupled vibration damage model and conducts experimental analysis for eval-uating the safety load-bearing mechanical performance of taxiway bridges. According to relevant specifications,for different damage types of taxiway bridges (overall damage, bearing damage and local cracks), the overallstiffness damage degree is quantified as 5%, 10%, 15%, 20% and 25%, and the bearing stiffness damage degreeis quantified as 20%, 40%, 60%, 80% and 100%. Based on the position of prestressed tendons, five crackdepths of 20, 40, 60, 80 and 100 mm are set to quantify crack damage. Combining the loading effects of differentaireraft types, this study investigates two response parameters of taxiway bridges (frequency and mid-span de-flection) under various working conditions to verify the feasibility of damage grading, and perform related safetyload -bearing capacity analysis of taxiway bridges. The results show that the variations of frequency and mid-span deflection of taxiway bridges under different damage types (overall damage, bearing damage and localcracks) are all clearly correlated with the damage degree, and different damage types significantly affect thestructural response of taxiway bridges.
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    Analysis of the effect of XPS insulation board compressibility on the temperature field of permafrost runway foundations
    QI Chunxianga , LU W eilonga, , HAN Zhuoa , MA Jiahuia , YUAN Zhongyuanb
    Journal of Civil Aviation University of China    2026, 44 (1): 60-67.  
    Abstract1512)      PDF(pc) (3319KB)(52)       Save
    To study the influence of compression deformation of the insulation layer under long-term aircraft loading on the temperature field of permafrost runway foundation (hereinafter referred to as subgrade), and in combination with the runway structure of Qinghai -Tibet Plateau airports, the finite element method was used to analyze the maximum stress range at the insulation layer during taxing of eight different types of aircraft. Furthermore, based on indoor model tests, the influence rule of the compression ratio of extruded polystyrene (XPS) insulation boardon its thermal conductivity under this stress, as well as the thermal insulation performance of XPS insulation boards with different thicknesses, was investigated. On this basis, a computational model of airport permafrostsubgrade was established for XPS insulation boards of different thicknesses. The effects of different compressionratios of the insulation layer on the thaw depth of permafrost subgrade and of runway width on the degradation of thermal insulation performance of XPS insulation boards were comparatively analyzed. The results show that the placement of XPS insulation boards can significantly reduce the thaw depth of the subgrade, and at the same compression ratio of the insulation board, an increase in runway width leads to an increase in the thaw depth of the subgrade. This study can provide a reference basis for the design of airfield pavements in permafrost regions of China.
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    Review of anomaly detection models based on deep learning
    ZHOU Maoyuan, WU Xiaoshuang
    Journal of Civil Aviation University of China    2023, 41 (4): 1-7.  
    Abstract1876)            Save
    With the proliferation of data complexity, traditional methods for anomaly detection are no longer applicable, while deep learning can process complex data and perform anomaly detection by multi-layer neural network. Through  extensive research on domestic and international research results, firstly, anomaly detection and the types of detection methods are introduced. And deep learning based anomaly detection models are classified into three categories of generative-based model, reconstruction-based model and single classification-based model. Secondly,the construction principles and development context of deep anomaly detection models under different categories are sorted out, and the applicability, advantages and disadvantages of various models are analyzed. Then, the commonly used datasets and evaluation indicators for anomaly detection are introduced, and the performance of different models are compared and analyzed. Finally, the challenges faced by deep anomaly detection are summarized and the future research directions are prospected.
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    Research on 16g longitudinal impact structure test of aviation rear facing seat
    LIN Ce, HUANG Zhiwei, ZHANG Kaining
    Journal of Civil Aviation University of China    2023, 41 (4): 8-15.  
    Abstract1083)            Save
    According to the AC 25.562-1B standard of the Federal Aviation Administration (FAA), the 16 g longitudinal im鄄 pact structure tests of the forward facing and rear facing seats installed in a certain type of business aircraft were carried out to meet the airworthiness requirements of Part 25 of the Chinese civil aviation regulations (CAAR).By comparing with the test force transmission path, test condition, test index, test process and test results of the forward facing seat, the differential characteristics of the rear facing seat in the 16 g longitudinal impact structure test were researched. The results showed that the inertial load of the rear facing seat dummy directly acted on the backrest, compared with the load of the forward facing seat dummy transferred to the backrest by the restraint system. The test load severity of the rear facing seat was less than that of the forward facing seat, the seat leg's maximum resultant interface load was 1.9% - 21.9% smaller than that of the forward facing seat, and the longitu鄄 dinal maximum deformation is 29.1% - 40.7% smaller than that of the forward facing seat. Compared to the for鄄 ward motion of the forward facing seat dummy, the rear facing seat dummy slided upward along the backrest ob鄄 viously under the inertial load due to the poor initial upward restraint effect of the safety belt. Since the distance between the head and the headrest of the rear facing seat dummy was very close and the headrest foam had a cer鄄 tain energy absorption effect, the injury risk of dummy head hitting the headrest was relatively low according to the head injury criterion (HIC).
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    Cybersecurity threat intelligence sharing scheme of civil aviation based on blockchain
    WU Yue, YA Junb , SUN Xianling , ZHOU Jingxiana , LYU Zongpinga
    Journal of Civil Aviation University of China    2023, 41 (4): 16-22.  
    Abstract1086)            Save
    In order to effectively respond to new network threats such as supply chain and ransomware virus, as well as build an active defense system for civil aviation network security, this paper proposes a cybersecurity threat intelligence (CTI) sharing scheme of civil aviation based on blockchain and encryption technology. This scheme takes the competent department of civil aviation network security as the intelligence management center, and achieves i鄄 dentity authentication and intelligence transactions of civil aviation enterprises and institutions on the chain through smart contract. And proxy re-encryption is applied to process information to ensure the safe sharing of intelligence. Meanwhile, to ensure the security of threat intelligence storage, the interplanetary file system(IPFS) is used to store the encrypted threat intelligence data off chain, and only the hash value of the file is stored on the chain. Simulation experiments and security analysis results show that the proposed scheme can achieve intelli鄄 gence sharing among various civil aviation units with lower costs, and has higher privacy protection intensity than existing schemes.
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