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Further discussion on low altitude economy: concept definition and#br# composition analysis#br# QIN Rui Journal of Civil Aviation University of China    2023, 41 (6): 59-64.   Abstract （8488）            Knowledge map    Save Aiming at the issue that current definition of low altitude economy fails to reveal its "category" and "variety difference" detailed and exactly, combined with the background and current usage of the concept of low altitude economy and based on the basic principles and methods of terminology, international terminology work standards and national terminology work standards, this paper defines low altitude economy as an economic field composed of a series of economic activities, with air transportation and operation equipment technology as the main tools, low altitude airspace as the main activity field, and low altitude flight activities as the final output form. Its basic composition is summarized as one key resource, three core industries, and four auxiliary population, which can provide reference for further clarifying the connotation and extension of the concept of low altitude economy and construct鄄 ing theoretical system of low altitude economy. Reference | Related Articles | Metrics | Comments（0）

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Flight ticket fare prediction model based on time-serial GU Zhao-Jun, WANG Shuang, ZHAO Yi    2013, 31 (2): 80-84.   Abstract （6967）            Knowledge map    Save With the development of aviation industry and the improvement of people's living level,an increasing number of people prefer to travel on air. But the airline companies are using revenue management system for real-time price adjustment which keep fare changing significantly. The price is characterized by large floating,which makes it valuable practically to research on predicting price. A flight ticket fare prediction model based on time-serial is proposed in this paper. A prediction of ticket time-serial algorithm is designed and implemented. Comparative analysis of the predicted and actual travel sites published price has indicated that the model can provide more reliable for passengers booking decision support. Reference | Related Articles | Metrics | Comments（0）

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Tail assignment problem based on flight-loop LIU Shan，HAO Li-dong，ZHANG Lin-ling，CAO Sheng-wen    2013, 31 (2): 57-62.   Abstract （5326）            Knowledge map    Save Tail assignment is the basic work in the airline manufacturing operations process,but it directly impacts the costs of the airline operating and the safety of flight. In this article,firstly,we found the integer programming model of flight-loop construction aiming to maximum the maintenance opportunity and made use of the combination of the column generation and Floyd shortest path algorithm to generate the flight-loop of multimaintenance base. Secondly,we used program by Matlab of branch-and-bound to obtain 0-1 optimal solution of programming model. Then,adopted the KM algorithm to complete the perfect match of the aircraft and flight-loop and realized the dynamic allocation of the flight-loop. Finally,through analyse of an instance we validated the correctness and efficiency of the method. Reference | Related Articles | Metrics | Comments（0）

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Analysis of drift down and cabin decompression for plateau route of Chengdu-Lhasa CHEN Lin，ZHANG Xu，LIU Xue-tao，ZHOU Guan-yu，HUANG Yu-feng，XU Chi    2013, 31 (2): 40-45.   Abstract （5254）            Knowledge map    Save This thesis first introduces the operating policy for plateau in Chinese aviation area,proposing the basic scheme and the master layout of operating control. Then the special terrain and the fundamental situation of both Chengdu Shuangliu Airport and Lhasa Airport would be introduced. This thesis analyzes the particularity of operating control on plateau route,which is from Chengdu to Lhasa,and lays special stress on analyzing the drift-down program and the related question on route. Considering to the route from Chengdu to Lhasa,this thesis takes aircraft A319-115 as reference. It analyzes the drift-down problem and cabin decompression when one engine is failure. The limiting factors in actual operation are considered as the variable. The purpose of the analysis is to make a further development on the flight safety. Reference | Related Articles | Metrics | Comments（0）

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Research on 3D scene model of airside area in airport based on AMDB DONG Jian-kang,Wang Jie-ning,JING Gao-yang,ZHAO Yuan-di    2013, 31 (2): 1-6.   Abstract （5158）      PDF       Knowledge map    Save  According to the requirements on photorealistic 3D model of airside area in an airport,a parameter modeling method based on AMDB and OpenFlight API is proposed. Firstly,AMDB framework and data organization are analyzed. Secondly,according to the AIXM5 standards, the integrated geometric data interface for extracting AMDB data is designed. Thirdly,the feature classification model of airside area in an airport is proposed;furthermore,by using OpenFlight API,we generate the photorealistic 3D model in accordance with the classification. Finally,we construct some airport 3D model with the above method. This technology can be used to constructor the airport 3D model automatically according to different seasons and weather condition. Reference | Related Articles | Metrics | Comments（0）

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RNP APCH vertical trajectory analysis based on QAR data ZHU Yan,ZHANG Guang-ming

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Performance analysis of GBAS based on code minus carrier and B values LI Qiang, ZHU Yan-Bo, FANG Kun    2013, 31 (1): 9-12.   Abstract （4931）            Knowledge map    Save The paper assessed GBAS accuracy performance based on two methods. A GBAS prototype was developed and used to collect and process GPS data. Based on the raw data,two methods called CMC and B values were used to analysis to GBAS accuracy performance. The result of both methods showed consistently that the GBAS prototype accuracy was on the level of GAD -A2 class. Compared with each other,CMC needs to use observations of dual frequencies,however,B values rely on single frequency. Secondly,CMC suppressed short-term multipath errors,and long-term multipath effects remained. B values,however,mainly consist of composite effects of multiple receivers忆errors after averaging across reference receivers,which reflect realistic errors of GBAS corrections as both occupied similar processes. Lastly,sky-maps of root mean squares of CMC and B values reflected surrounding multipath effects of GBAS sites. Reference | Related Articles | Metrics | Comments（0）

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Analysis of ionosphere impact to GNSS civil aviation application ZHU Guo-Hui, SHI Le, ZHU Yan-Bo    2013, 31 (1): 1-4.   Abstract （4916）            Knowledge map    Save The ionosphere is the most complex factor of GNSS error of the civil aviation operation. As the character of complex model,disturbance,scintillation and storm,the ionosphere will bring serious effect to civil aviation especially at the solar cycles. Now there are the methods of model,relative positioning,and ICAO also start the work of collecting ionosphere data and creating regional ionosphere model. This paper is mainly focus on the ionosphere character,the effect of civil aviation,and bring forward the way to eliminate the ionosphere effect. Reference | Related Articles | Metrics | Comments（0）

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Ground-based RNAV performance evaluation system design and application ZHANG Ming-Hao, ZHU Guo-Hui, GUO Ping-Ping    2013, 31 (1): 5-8.   Abstract （4783）            Knowledge map    Save Ground-based area navigation is an important part of the implementation of area navigation,and the operation of ground-based area navigation must evaluate the coverage and accuracy of the DME facilities,in this way to ensuring the effectiveness and safety. This article describes the basic calculation principle of the ground-based area navigation system,the network structure,the system design method and the function of system,such as data management,analysis and evaluation of navigation performance,data exchange,and so on. This paper also introduces an application case which combined the specific airport. The purpose of this paper is that giveing a solution to solve the problem of ground-based regional navigation performance assessment. Reference | Related Articles | Metrics | Comments（0）

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Static source error correction of civil aircraft based on stepwise regression analysis  ZHANG Peng , BAI Yanhui Journal of Civil Aviation University of China    2022, 40 (2): 1-5.   Abstract （4713）            Knowledge map    Save Aiming at the static source error of civil aircraft air data system, the correlation between error and main influencing factors is analyzed by stepwise regression analysis, the static source error correction model is studied and an effective error correction scheme is proposed to improve the accuracy of static pressure measurement. B777 aircraft model is taken as an example, the consistency between 3D modeling created by Solidworks and the real machine experiment is verified by computational fluid dynamics(CFD) simulation method. Static pressure measurements under different flight conditions were obtained through simulation and post-processing, and the errors are corrected according to the error correction scheme proposed by the stepwise regression method. The error of the calculated airspeed according to the revised static pressure solution is less than 3%, which meets the requirements of airworthiness clause. The revised scheme has high practical application value, and can provide reference for the design of static pressure source error correction scheme for civil aircraft. Reference | Related Articles | Metrics | Comments（0）

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Efficient method for multi-thread text drawing based on OpenGL WU Ren-biao,WU Hai-ning,QU Jing-yi,JIA Yun-fei    2013, 31 (4): 23-26.   Abstract （4685）            Knowledge map    Save The OpenGL Library has not offer the function of text display and processing directly. Literature 4 provided a method of OpenGL drawing text based on GDI,but the efficiency was low and occupied too much of CPU time.Considering the feature of Windows multi-threading mechanism,some improvements are made,and a new method for text drawing in OpenGL based on multi-thread is proposed. This method can effectively utilize the advantages of multi-core processor,and add obvious advantages to high requirement of real-time or large quantities of text data drawing. Experimental results show that the application of this method can improve text drawing efficiency and improve user爷s experience. Reference | Related Articles | Metrics | Comments（0）

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Applied method for gate assignment in airport YANG Yue,WANG Ben,LIU Yang

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Testing of dynamic mechanical property of several aluminum alloy materials ZHANG Zheng-li

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Study on service depth of airport rigid pavement subgrade CHENG Guo-yong，YANG Zhao-huan    2013, 31 (2): 51-56.   Abstract （4472）            Knowledge map    Save In this article finite element software is applied in analysis of the influence of aircraft load,surface layer thickness,flexural modulus of concrete and the rebound modulus of subgrade parameters on subgrade service depth with the additional stress is equal to the gravity stress of 10% as a standard. The results show that:the influence of aircraft load type on the service depth is relatively distinct,service depth in subgrade of light aircraft is about 1.5 m,and service depth of heavy aircraft reaches 6.0 m. The service depth in subgrade with the heavy aircraft ranged from 4.4~6.0 m under the condition of slab thickness in 0.2~0.5 m range,which extended by 36.4% of the lower value;the surface layer material flexural modulus to influence depth is very small. The service depth in subgrade with the heavy aircraft ranged from 4.4 m to 5.4m under the condition of the subgrade resilient modulus in 18~80 MPa range,extended by 36.4%. The conclusion above is more referenced by soft foundation treatment and analysis. Reference | Related Articles | Metrics | Comments（0）

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A study on the rainstorm that causes flight delays——An event of rainstorm over Sichuan Basin on July 11, 2018 LIU Haiwen , HOU Shaoyu , MAO Jiangnan , GONG Yuanfa Journal of Civil Aviation University of China    2022, 40 (2): 6-13.   Abstract （4401）            Knowledge map    Save Rainstorm is one of the main bad weathers that cause large-scale flight delays. The rainstorm in Sichuan Basin on July 11, 2018 (7.11 rainstorm hereafter) was analyzed using the national hourly encrypted precipitation data, National Centers for Environmental Prediction (NCEP)-final reanalysis data(FNL) and FY-2E infrared cloud chart, by the methods of weather analysis and medium scale numerical simulation.The results showed that the heavy rainfall on July 11 occurred at 02 ∶ 00 am and 08 ∶ 00 am on the 11th. The former is a night rain, and the latter is a daytime precipitation. At 500 hPa, the Baikal Lake vortex extends to the Westerly trough of Sichuan Basin, at 700 hPa, the Southwest vortex and shear line located in the basin, the West Pacific Subtropical High (WPSH) and typhoon Maria are the main weather patterns that affect the 7.11 rainstorm. The mesoscale numerical model weather research forecast(WRF) can better simulate the spatial distribution of the 24-hour accumulated precipitation, but the simulation result of daytime precipitation is not good. In addition, the duration of the southwest vortex simulated by the model is shorter than that of the actual situation. Reference | Related Articles | Metrics | Comments（0）

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Aero-engine fault detection based on one-class support vector machine CAO Hui-ling,YANG Lu,LIN Yu-sen,QU Chun-gang

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Aircraft fuel tank fire safety analysis based on FMEA SONG Biao,WANG Xu,ZHANG Huan

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Precise management of airline meal service HU Heng, KONG Gang    2013, 31 (2): 89-92.   Abstract （4269）            Knowledge map    Save To solve the problem of present confusion of airline meal service management,a precise management of airline meal services is introduced and developed into practice. Under the primary meal service management,meal services are set by airline controllers before the flight seasons (sprint/autumn),but supplied by ground server in real time,thus sometimes caused the mismatch between the meal service on ticketing and the meal service on trip. Complaints caused by the confusing of the meal service can be up to 10% of the overall complaints. To solve this problem,the precise management of airline meal service is designed and developed. Airline controllers can manage meal data on ISS2 in real time,and ISS2 quasi synchronized the meal service data to the mainframe,which calculate and display accurate meal data in AV display to users.Practices show that the precise management of airline meal service can effectively develop the meal service management of airlines,thus reduce 80% mismatching of meal service on ticketing and on-boarding,thusreduce the passenger complaints by 8%,which then improve the satisfaction of the consumers,and thus has a good application prospect. Reference | Related Articles | Metrics | Comments（0）

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Antomatical identification and tracking of MCS based on satellite cloud image DUAN Lian,LIU Fan,WU Jun-jie

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Identification method for non-normative NOTAM based on NLP  XIANG Heng , ZHANG Chi , LI Meng Journal of Civil Aviation University of China    2022, 40 (2): 14-18.   Abstract （4146）            Knowledge map    Save Aiming at the non-normative problems of item Q and item E in the notice to airmen（NOTAM）, a method of text similarity calculation in natural language processing is proposed to identify the non-normative NOTAMs. Firstly, translating the item E into Chinese by statistical machine translation method, and translating the item Q into Chinese by establishing a database. Then, Word2vec model is used to calculate the similarity between the two sentences, and the recognition standard of non -normative NOTAMs is established. Based on the similarity calculation of item Q and item E in 500 collected NOTAMs, 0.7 is set as the benchmark of non -normative NOTAMs. The data test shows that the recognition accuracy of NOTAMs is 96.2%, which verifies the feasibility of non-normative NOTAMs recognition method based on NLP. Reference | Related Articles | Metrics | Comments（0）