Table of Content

24 June 2018, Volume 36 Issue 3

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Civil Aviation

Numerical forecast model of accidental damage based on advanced Grey-Markov chain

JIA Baohui, GENG Zheyuan, LIN Yueguo, WANG Yiqiang

2018, 36(3):  1-6. 

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Accidental damage is one of the main sources of aircraft structural damage, which could cause huge economic loss to airlines and bring a great threat to aviation safety. Analyses and forecast of accidental damage incidents are important parts of civil aviation safety research. Study on influential factors and developing trend helps avoid such accidents in the future. According to statistical data of China civil aviation safety information, an advanced Grey-Markov chain model which combines the advantages of Grey prediction and Markov prediction has been applied in short-term forecast of accidental damage incidents. The Grey-Markov chain model is improved for higher accuracy and longer predictable time. Result shows that the improved Grey-Markov chain model's accuracy is better than that of GM (1,1) model, the current model could be used for prediction of accidental damage incidents and provide reference for probability grading of accidental damages.

OEI missed approach emergency procedure optimization based on PEP

XIE Chunsheng, DAI Yujie

2018, 36(3):  7-10. 

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With the rapid development of regional economy and civil aviation,needs for aeronautical transportation in areas with high-altitude and complicated terrain are becoming more and more remarkable. In order to ensure operational safety, deeper researches on OEI (one engine inoperative) missed approach flight procedure are urgently needed.Aeronautical dynamic model in OEI missed approach flight procedure design is put forward, designing and optimizing the current procedure based on PEP model. The method enables aircraft to fly over obstacles safely,increasing the maximum landing weight and enhancing operational efficiency for airlines.

Aircraft cabin airflow analysis based on CFD

YANG Wenqiang

2018, 36(3):  11-17. 

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Based on engineering application, the correlative models of aircraft cabin are set up, cabin air distribution system is designed. Then, analysis of cabin airflow and air age has been carried out with CFD. Results show that: a.change of air supply temperature has influence on corresponding area and few on other zones; b. the area of airflow outlet, amount of recycling air and position of outflow valve have less effect on distribution of cabin air temperature and speed; c. first-class cabin gets more fresh air, business cabin gets less fresh air and economic cabin gets least.

Temperature effect on dynamic deflection of airport concrete pavement

LIU Hailun, LI Meng, DU Hao

2018, 36(3):  18-21,30. 

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To study the airport concrete pavement dynamic deflection behavior due to daily temperature variations, slabs in aircraft movement area are selected to test per hour one day. Relations between slab interior deflection, slab side deflection, slab corner deflection, load transfer efficiency and pavement surface temperature variations are analyzed respectively. Results indicate that slab interior deflection barely varied as temperature changed.Besides, side deflection, corner deflection, voids ratio are varied considerably as pavement surface temperature changes in a negative correlation. Meanwhile, the dummy joint pavement load transfer efficiency is affected by temperature significantly, and the tongue and groove joint pavement are almost unaffected.

Research on roof structure geometric configuration of orthogonal huge cylindrical reticulated shell hangar

ZHAO Fangran, LIU Fang, QI Lin

2018, 36(3):  22-25. 

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Geometric configuration of orthogonal huge cylindrical reticulated hangar shell is analyzed, numerical relationship between geometric parameters is deduced, and the modeling method of this structure is proposed. Modeling program is designed, given parameters such as span, length, height and mesh number, then a geometric model of orthogonal huge cylindrical reticulated hangar shell structure is generated. Compared with orthogonal square pyramid double-layer cylindrical reticulated shell and diagonal square pyramid double-layer cylindrical reticulated shell, maximum stress, maximum deflection and steel consumption per unit area are calculated. Results show that the orthogonal huge cylindrical reticulated hangar shell has structure with clear priorities, reasonable stress and specific transmission route. On the basis of ensuring strength and rigidity, material consumption and weight of the structure are reduced. Besides, greater span of hangar structure can be realized. The current study provides reference for theoretical research and engineering design of hangar roof structure.

Airport passenger flow prediction based on various models

LIU Xia, CHEN Lei, QIU Zhao, CHEN Huandong, CHEN Mingrui

2018, 36(3):  31-36,57. 

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Based on the passenger flow data of Sanya Phoenix Internotional Airport (Sanya Airport for short) from 2008 to 2016, ARMA model, grey prediction GM (1, 1) model and improved ARMA regression model are adopted for data fitting. Upon verification, the average absolute percentage error of the three models are respectively 4.19%,
4.20% and 1.97% with high prediction precision. Passenger flow at Sanya Airport is predicted to reach 20 million in two years.

Airport passenger grouping model based on dichotomic K-means algorithm

ZHONG Xiang, HAN Xu, ZHU Caiyun, WANG Xiaomeng

2018, 36(3):  37-40. 

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Providing personalized service for passengers is the developing direction for airport service quality improvement.Passenger data of TBIA security information system is extracted, then the passenger grouping models are respectively built according to their personal characteristics and travelling features. Analysis proves that the dichotomic K-means algorithm can effectively group airport passengers with ideal clustering results.

Economic system and airport system evaluation based on coupling coordination model

WEI Ran, WU Xiangyue

2018, 36(3):  41-45. 

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With the development of regional economy, airports have become a driving force for the rapid development of city economy. Airport construction depends on economic development, economic development is also subject to the constraints of airport construction, the two systems have a typical interactive relationship. It is of great significance to study the coupling between economic system and airport system, and to realize the mutual catalyses as well as interactive and healthy development between the two systems. Based on coupling coordination theory, the coupling coordination evaluation model of economic and airport system is constructed, meanwhile, the empirical analysis of Tianjin is conducted. Results show that the coupling degree of the two systems in Tianjin has been increased from 2005 to 2014 with imbalance and unbalance in certein period from 2005 to 2011. The two systems showed barely and primary coordination from 2012 to 2014.

Construction of pilots爷psychological competency model based on personality characteristics

WANG Yichen, ZHAO Rucheng

2018, 36(3):  46-51. 

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Through interview and psychological competency questionnaire for civil pilots, the psychological competency model is constructed, finding out whether pilots'personality affects aviation safety. Qualitative and quantitative methods such as document research, interview, questionnaire, exploratory factor analysis and confirmatory factor analysis are employed. Pilots'psychological competency model is constructed including 42 items and 8 dimensions such as strictness, introspectiveness, compliance, boldness, confidence, dominance, constancy and extroversion. Data validation proves the reliability and validity of the current research tool. The pilots'psychological competency model is helpful for pilots爷selection and training.

Engineering and Technology

PMSM mathematical model considering magnetic saturation, field harmonics and magnetic energy storage changes

CAO Boshu, SONG Jian, CHEN Bin

2018, 36(3):  52-57. 

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Magnetic saturation, field harmonics distortion and changes of magnetic energy storage will cause conventional model distort in heavy load condition of PMSM. The magnetic energy storage change effect is considered and reformed formula of counter electromotive force and torque of PMSM is introduced. A given motor is  electromagnetically analyzed using finite element software Ansys EM and cross saturation inductance curves, demagnetization curves and harmonic parameter are extracted. A nonlinear d-q axis motor model is established and tested on Matlab simulation platform based on extracted parameters. Result shows that the reformed model can reflect the electromagnetic torque harmonics of the PMSM much more accurately than the conventional one. Therefore a more accurate PMSM model basis is designed and tested for characteristics of PMSM drive research in heavy load.

Influencing factors analyses of concrete cutting force of diamond saw blade

SUN Zhichao, LIU Xinchen, ZHANG Baopeng

2018, 36(3):  58-61. 

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Diamond saw blade in cutting process is analyzed, and the relationship between cutting speed, cutting depth,sawing speed and cutting force is analyzed based on single particle diamond abrasive model. The regular pattern between cutting force and cutting influential factors is obtained and verified, providing sound theoretical guidance for diamond saw blade cutting concrete pavement.

Basic Science

Selective projection method for convex feasibility problem solving

HE Songnian, TIAN Hanlin

2018, 36(3):  62-64. 

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A new and simpler algorithm for solving convex feasibility problems named selective projection method is proposed. This method has the advantage of small computational effort since it only computes the projection operator once in each iteration. Meanwhile, the strong convergence of the algorithm is proved.