Table of Content

24 February 2014, Volume 32 Issue 1

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Civil Aviation

Implementation of track estimation based on flight plan for general aviation

WU Ren-biao,LIU Yan-bin,WANG Xiao-liang

2014, 32(1):  1-4. 

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A track estimation method is presented which utilizes aircraft performance parameters based on flight plan for general aviation aircraft. The track estimation method employs three-stage flight model which includes climb,cruise and descent. Then the aircraft performance parameters in different flight levels are employed to calculate durations in climb and descent stage. A track points pairing method is also presented,which could be utilized in track estimation updating. The method is implemented by C++ and applied in general aviation flight data processing system successfully.

Optimization of terminal airspace structure based on network complexity

WANG Hong-yong,ZHAO Yi-fei,CUI Wei-guo

2014, 32(1):  5-9. 

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According to the complex state of traffic network of airport-ground taxiway and the terminal area,and based on the researching of entropy theory，the definition and calculation method of air-ground traffic network complexity are proposed, Based on the complex network theory,the quantitative description of air-ground
traffic network complexity is realized by maximum entropy modeling. Finally,a new airspace structure optimization strategy is proposed based on the complexity of network structure. This method has been validated and its feasibility is analyzed with the Beijing Capital International Airport Terminal airspace data. It can provide a reference for the terminal airspace structure optimization.

Fuzzy comprehensive evaluation of runway incursion risk based on analytic network process

LU Fei,ZHANG Zong-lu,ZHANG Zhao-ning

2014, 32(1):  10-14. 

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Along with the increase of the airport traffic,runway incursion events are increasing rapidly,which have severely affected the airport security. In order to guarantee the safe operation of the airport,the assessment of runway incursion risk is critically significant. Firstly,after analyzing runway incursion influencial factors,the runway incursion risk assessment index system is established. Analyzing the interdependency relations of evaluation index,the runway incursion analytic network process (ANP)network structure is constructed,and Super Decision software is used to determine the weight of every index. Then,fuzzy comprehensive evaluation method is used to assess runway incursion risk. Through case analysis,the feasibility of the assessment method is verified. Finally,the promotion countermeasures are proposed for the airport to reduce runway incursion risk based on the evaluation results.

On gate reassignment for aircraft based on operational safety

LIU Chang-you,CAO Qiang

2014, 32(1):  15-19. 

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Gate reassignment for aircraft based on operational safety is researched. First,three objectives are proposed as following the minimization of flights assigned to the apron,the disturbance of airport gates and the nonbalance of gate utilization ratio. Then a safety restraint is introduced into the model of gate reassignment and the particle swarm genetic algorithm is applied to solve the model. Finally,an example with the realistic data is implemented to show the validity of the model and the algorithm.

Research on unbalanced degree of departure delays based on Lorenz curve

YUE Ren-tian,LIU Wen-qiang,XU Xiao-hao

2014, 32(1):  19-22. 

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Identification and prediction of the air traffic situation is one of the current research focuses. In this paper,evaluation index system of an air traffic situation is constructed based on the concept of situation,and the unbalanced situation of takeoff average delay is studied based on the Lorenz curve and Gini coefficient. Finally the effectiveness and feasibility of the method is illustrated with an example.

Numerical simulations and wind field analysis of severe convective weather

JIANG Li-hui,YAN Zheng,ZHUANG Zi-bo,LIU Jia-ying

2014, 32(1):  23-27. 

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A severe convective weather occurring at the Baiyun Airport on Apirl 27,2012 is simulated by using WRF3.3(Weather Research and Forecasting Model,Version 3.3)and NCEP (National Center of Environment Predicting),meteorological data with 1°×1°grid are reanalyzed,making a deep diagnostic analysis with three nested simulation and visualization tools GRADS.The results show that there is a strong simulating ability for the severe convective weather process by WRF. It is important for this weather that the 950 hPa mesoscale eddy convergence center couples mutually with the 200 hPa mesoscale negative divergence center,energy is interchanged between each other. Compared with the different resolution wind field data,there is a greater impact at the lower atmosphere as improving the resolution;there is a certain degree of positive correlation between the size of severe weather threat index and the occurrence of severe convective weather.

Exergy analysis of gas turbine engine

TIAN Chuan,CAO Hui-ling

2014, 32(1):  28-32. 

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In order to find out the exergy loss of aero-engines,and to reveal the weakest chain of the exergy utilization,this article analyzes the exergy efficiency of single-spool turbo engine,turbofan engine and the intercooled and recuperated turbofan engine. The calculation results prove that the exergy loss during the wake equilibration process is the largest part of the exergy loss,which is more than one third of the overall exergy.The second largest part of the exergy loss is in the combustion chamber. When the intercooled and recuperated components are applied,the entire exergy efficiency can be better,what's more,the exergy loss during the wake equilibration process is significantly reduced. By analyzing the exergy efficiency of different types of aero-engines,this article will contribute to the design and improvement of the future aero-engines.

Engineering and Technology

Calibration of pedestrian and vehicle parameters in VISSIM based on genetic algorithm

LI Xin,CHEN Xu-mei,WAN Tao,GUO Shu-xia

2014, 32(1):  33-35. 

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Microscopic simulation models have been widely used in traffic system management,control and optimization.Parameter calibration is necessary before the application of traffic simulation software. Calibration of microscopic traffic simulation models under pedestrian and vehicle interweaving case is even more challenging.Taking the microscopic simulation software VISSIM as an example,the calibration problem is studied when pedestrian and vehicle are interwoven in microscopic traffic simulation models,and a procedure for parameters calibration is proposed by applying genetic algorithm. Using actual data,parameters of vehicles and pedestrians at airport curbside of the T3 terminal at Beijing Capital International Airport are calibrated.The efficiency and accuracy of the simulation test is effectively improved,which verifies that the proposed method is useful.

Effect of oxidation process on binding properties of titanium alloy/coating during thermal spraying

JI Zhao-hui,SUN Zhen,YANG Lv,ZHU Hao-nan,ZHANG Xue-wei,XUE Ru

2014, 32(1):  37-40. 

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By exploring the oxidation mechanism of titanium alloy during the thermal spray process,its effect on binding properties of the coating/substrate is obtained. Using the method of HVOF,WC coating on titanium alloy surface is prepared under different processing states. Comparing two samples'element contents,microstructures and mechanical properties,the effect of oxidation process on binding properties of titanium alloy/coating during thermal spraying is analysed. EDS analyses show that the sand blasting process has little effect on the oxidation of titanium and it can be ignored basically. By stretching and bending tests we find that oxidation in spraying process has a greater impact on the coating/substrate and leads to different binding properties finally. The results show that the oxidation during spraying process can cause degradation of combination performance of coating/substrate.

Testing of dynamic mechanical property of several aluminum alloy materials

ZHANG Zheng-li

2014, 32(1):  41-45. 

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In order to research dynamic mechanical property of aircraft structure common aluminum alloy materials(including 2024,7050 and 6061),universal testing machine and split Hopkinson pressure bar are used in large-scale strain rate (10-4 /s~104/s),quasi-static and dynamic,tension and compression testings. Dynamic stress-strain curves of those materials are obtained. Strain rate sensitivity is analyzed. The intrinsic mechanism is discussed according to the dislocation motion theory. The experimental results show that 2024 and 7050 have no strain rate sensitivity and 6061 has strain rate sensitivity.

Workability index and influence factors of asphalt pavement repair material

LIAO Xiao-fang,LING Jian-ming,ZHANG Hui-yu,YUAN Jie

2014, 32(1):  46-50. 

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According to Marshall Design method,after 75 times compaction for each face of Marshall sample,the proportion design of asphalt pavement repair material is presented. Void volume and height of Marshall sample with 50 times compacted are tested,evaluation indexes of workability (h₀)for airport mix asphalt is proposed. (h₀)is regarded as one of the proportion design indexes. The influence of bitumen aggregate ratio,gradation composition and compaction temperature to workability of airport mix asphalt are analyzed. These studies indicate that the more bitumen,the better workability is,the more coarse aggregate,the worse workability is,the higher temperature,the better workability is.

Basic Research

Robust H_∞control for uncertain fuzzy systems via dynamic output feedback controller

ZHAO Yun

2014, 32(1):  51-56. 

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The problem of robust H∞control for a class of T-S uncertain fuzzy systems has been studied,as well as the sufficient conditions,which maintain the robust H_∞control of the whole fuzzy systems based on the full order fuzzy dynamic output feedback controller. On this basis,the matrix is divided into two nonsingular matrices,and the sufficient condition is transformed into linear matrix inequalities(LMIs),in order to solve the question by software Matlab. What's more,the matrices of dynamic output feedback controller,which are to be determined,can be obtained by the relationship of matrices in sufficient conditions. The full order fuzzy dynamic output feedback controller is used to study the problem of stability for fuzzy uncertain systems,and the robust fuzzy H_∞control problem is also discussed. Furthermore the final numerical example is included to show the effectiveness of the proposed method.

Particle filter algorithm of solving large-scale 0-1 none linear programming

LIU Shan,WANG Wei,MA Shan-zhu

2014, 32(1):  57-59. 

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In order to solve large-scale 0-1 nonlinear problem，particle filter is designed and implemented. Particle filter using particle set to indicate the probability can be used in any form of state space model. The core idea is to express the random state particles extracted from the posterior probability distribution，which is a sequential importance sampling method. In solving large-scale nonlinear 0-1 programming problem，the solution is divided into M intervals，uniformly distributed random decimal number particles in each interval，the conversion of the interval length binary number is used to get the initial feasible solution，calculating the mean and variance of the initial particles feasible solution in each interval. Then normal distribution iterations are used to produce feasible
solution particles，so that the particle distribution of the feasible solutions gradually approaches or is equal to 0-1 nonlinear programming and get the optimal solution.

Civil Aviation Management

Evaluation on coordinated development of regional transportation based on DEA

PENG Yu-bing,WEI Xia

2014, 32(1):  60-63. 

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Transportation and economic always interact,economic can promote by improving the coordination development degree of the regional transportation system. The coordination degree of Anhui Province between civil aviation and railroad and highway are calculated,based on DEA. And the result shows that the coordination degrees are low. Finally,the development restricting factors of regional comprehensive transportation coordinated are found,which are the regional economic structure,the location and the operational efficiency of civil aviation. Results show that Anhui Province should increase the investment of civil aviation.

Analysis of flight flow network survivability based on failure of flight route

DANG Ya-ru,DING Fei-ya,SHI Li-yuan,LI Xue-jiao

2014, 32(1):  64-69. 

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Using complex network theory,the flight flow network is constructed and the following indices such as average path length,clustering coefficient,the decline rate of maximum connected subgraph size and overall efficiency are taken to analyse network survivability based on the failure of flight routes. The results show that the flight flow network has vulnerability to the deliberate route attack,especially the key routes with great betweenness,the network survivability decreases very fast,resulting in the fracture of the east-west link. The decline rate of network survivability under the weight of attack is slower than the betweenness attack,but because of the increasing average path length,the economic costs rise. So the routes with great betweenness and weight need to be ensured safely operation,and the structure of route network needs to be optimized continually.

Comprehensive passenger transport and civil aviation passenger transport forecast based on traffic integration and internationalization

HAN Ming-liang,ZHU Yan-mei

2014, 32(1):  70-73. 

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During the "Twelfth Five-Year Plan"period,China's economic and social development will enter a new historical level as well as transportation. Traffic integration and internationalization is the new trend of the development of modern transportation,which will affect our integrated transport passenger traffic profoundly. An integrated transport passenger traffic prediction model is developed considering the effect of traffic integration and internationalization,compared with traditional methods,not only considers those ordinary factors such as economy and transportation developing,but also reflects the traffic integration and internationalization's effect to the integrated transport passenger traffic systematically.

Study on hedging strategies of aviation fuel between domestic airlines

LI Xiao-jin,WANG Zhi-qiang,HU Xue-xin

2014, 32(1):  74-76. 

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In recent years,the volatility of international fuel prices has a serious impact to the domestic civil aviation market,to avoid the operational risk along with sharp fluctuations in fuel prices,aviation fuel hedging is hold by domestic major airlines. From this point,the fuel hedging strategy has aroused widespread concern for companies. NYMEX heating oil is taken as a fuel hedging subject matter,using the ARIMA model and neural network model to predict the short-term fluctuations of fuel prices,the two models'predicted results are compared at last. After predicting the NYMEX heating oil short-term price,considering the risk preference parameters of hedging counterparty,taking the hedging utility maximization as an object function,one reasonable hedging ratio is finally obtained.

Empirical research on relationship between airlines governance structure for corporate performance

LI Chun-ling,YANG Chen

2014, 32(1):  77-82. 

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China's listed airlines from 2006 to 2011 are selected as research samples. The empirical researches on the relationship between corporate governance structure and corporate performance are more from industry-wide. Firstly,corporate governance structure indicators and corporate performance indicators of the listed airlines are selected;factor analysis is employed on the comprehensive evaluation of corporate performance;then,multiple regression analysis is used. The results show that airlines proportion of independent directors and the top three executive remuneration are significant at the 0.01 level for company performance;the top five shareholders who hold the proportion of shares,the proportion of stateowned shares,the size of the board and the executives'stake have no effect on the company爷s performance. Recommendations based on the results are finally proposed.

Research on green airport evaluation index system

WANG Xia,SUN Shi-lei

2014, 32(1):  83-87. 

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Under the background of the increasingly heated global demand for environment protection,how to resolve the high energy consumption and emission of civil aviation industry has been highly anticipated. Green airport is involved in the realm of deeper level of sustainable development,to develop green airport is of great urgency.Starting with the principles and ideas of the green airport index evaluation system from both the construction and management,the four basic connotations of green airport are analyzed:environmental protection,conservation,technology and humanity. On the basis of the existing domestic and international green building assessment system,the evaluation index system of the green airport construction is constructed;a detailed evaluation index system is established from management regulations and services on the basic principle of the '5R'green management,and on the basis of expert score sheet,using the ANP(analytic network process) model and the software of super decision ('SD'model)the index weight is concluded.

Establishing and research on aircraft leasing company's financial evaluation index system

SUN Xin-xian,CHEN Shuo

2014, 32(1):  88-91. 

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The management quality of aircraft leasing company will be an important part of the capability increase of Chinese air transportation,but there are no related researches now. So a comparatively complete financial index evaluation system of aircraft leasing company is built through AHP and does empirical analysis on Tianjin Bohai Leasing Co. with it. The conclusion of the financial status is good and still has potential accords with the position in industry objectively,so this system is effective and practical.

Overview and enlightenment of demand forecasting method research about aircraft spare parts

ZHANG Yong-li,LIANG Jing

2014, 32(1):  92-96. 

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Demand forecasting is the basis of scientific management of aircraft spare parts. Starting from the characteristics of aircraft spare parts demand,forecasting methods are discussed,which corresponds to different demand types of slow moving,intermittent,lumpy and erratic demand;then the differences in research method between Chinese and foreign scholars are summarized;finally aircraft spare parts demand forecasting system is proposed,providing reference for aircraft spare parts demand forecasting study and support for the aircraft spare parts management decision making.