Table of Content

23 June 2013, Volume 31 Issue 3

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Civil Aviation

Analysis of final approach deployment procedures based on path objects

ZHAO Yi-fei,LIU Ran,WANG Hong-yong

2013, 31(3):  1-5. 

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For the fact that approach control is characterized by high flight-density, numerous potential conflicts and large deployment difficulty, an intelligent deployment procedure is proposed. To establish a parameter model, the final approach deployment procedure is divided into several basic flight procedures, combined with the concept of path objects and the features of final approach flight. By model calculating, we can collect information of the key location points as well as flight control parameters, and generate the flight path; all the data are integrated to form a complete deployment scheme, which can provide reference and service for the actual flight controlling practice. Feasibility of the theoretical method has been proved through simulation calculation.

Design of aircraft accidents analysis software based on Reason model

GENG Zeng-xian,ZHAO Yi-fei,MENG Ling-hang,XIE Yi-zhe

2013, 31(3):  6-9. 

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To decrease air traffic accidents and ensure flying safety, it is significant to analyze and study the existing aircraft accidents and propose corresponding advanced solutions. Through analysis of current cases, designing of aircraft accidents analysis software is approached based on Reason model. With introduction of basic concepts of the model, the authors elaborate on the system structure, the interface as well as corresponding operating steps and methods of the software; and illustrate its advantages in analyzing and investigating aircraft accidents with actual cases. This software is of certain reference for investigation and analysis of human factors in civil aviation unsafe accidents.

Fidelity evaluation of aerodrome control simulator based on fuzzy AHP

LI Nan,LI Ning,XU Xiao-hao

2013, 31(3):  10-13. 

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Fuzzy comprehensive evaluation method and analytical hierarchy process are used to evaluate the fidelity of aerodrome control simulator. According to the demand function of the aerodrome control simulator，the evaluation index system is established by the analytic hierarchy process and then sub-levels of fuzzy comprehensive evaluation are applied. Finally，the results show that this method is scientific and reasonable and easy to implement for equipment selection.

Trajectory clustering method research based on improved Fuzzy C-Means

WANG Chao,WANG Ming-ming,WANG Fei

2013, 31(3):  14-18. 

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In order to guide the improvement of flight procedures and find the command mode of the controller,this paper firstly analyzes the historical flight path,and categorize the characters by the minimum description length (MDL) theory,then clusters the characters using of the improved Fuzzy C-Means (FCM) method combined with the GA and SA,and receives the trajectory similarity matrix by the longest common subsequence (LCS),lastly generates the mean routs through the trajectory clusters. The simulation tests show that this new methodis quite effective.

Aviation wide-band communication wireless signal access technology

WANG Li-li,SUN Chen-he

2013, 31(3):  19-22. 

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To study the aviation wireless broadband communication system wireless network signal coverage (radio access network) problem, three wireless signal coverage models are put forward:base station aviation communication coverage model, satellite relay aviation communication coverage model and HAPS aviation communication coverage model. The above three models are compared and analyzed fromthe aspectsof construction cost, technical difficulties and covering effect. The following conclusion suggests that:base station aviation communication coverage model is mature but with high construction cost, mainly suitable for airport and busy route; satellite relay aviation communication coverage model is cheaper but with low data transmission rate, accordingly incapable to meet the requirement of broadband communication and suitable for transoceanic route, off-peak route and temporary route; HAPS covers a widest range with lower cost, but this technology is not mature enough, which can be applied in future aviation broadband communication signal covering technology.

Research on digital certificate in ACARS ground-air datalink

WU Zhi-jun,JIA Yue-lin

2013, 31(3):  23-26. 

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Aircraft Communication Addressing and Reporting System （ACARS）is the main method of communication in civil aviation of China. ACARS air-ground datalink is quite important for aviation security，while the datalink system is not secure enough since lacking of adequate research on it. With regard to the shortcuts of entity authentication method in ACARS，and on the basis of analyzing the risks existing in the datalink，this paper studies the digital certificate authentication method based on the elliptic curve cryptography during the secure session initiation process between the ground and aircraft entity，then designs and implements a certificate authority for signing and managing certificates based on OpenSSL in aviation ground-air datalink，and finally completes the authentication between ground and aircraft before the secure session. Analyses show that the digital certificate authentication method used in ACARS improves the security of the system，without impacting on system performance.

Applicability analysis of ATC3 in process of aviation controllers'training

ZHANG Xiao-yan,MA Jiang-tao

2013, 31(3):  27-30. 

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The rapid development of civil aviation puts forward high requirements of the air traffic controllers'quality and quantity,meanwhile the corresponding training and cultivation in related colleges are limited by the shortcomings of controlling simulator. Through detailed studies of ACT3 and comparison with the current
controlling simulators,the innovation,advantages and disadvantages of this software are discussed, as well as the applicability of which in aviation controller training. According to the features of ACT3,some optimizing suggestions are proposed,making better applying in controller training, improving training quality and efficiency and satisfying the urgent needs during civil aviation development in China.

Research of fuel flow regression model of aircraft climb phase based on QAR

CAO Hui-ling,JIA Chao

2013, 31(3):  31-35. 

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QAR can be used for aircraft and engine performance analysis, recording abundant key flight data such as fuel flow. Taking PW4077D engine installed in B777-200 as researching object, the author analyzes its QAR data in details, builds fuel flow regression model during aircraft climbing phase with multiple regression analysis approach, and verifies the accuracy with actual data. The results build basis for comprehensive research of engine fuel flow controlling laws, help to monitor and predict engine fuel flow and improve aircraft safety and economy.

Simulation of acceleration process of turbofan engine

BAI Jiea，YAN Guo-hui，WANG Da-wei，NIU Chun-ming

2013, 31(3):  36-39. 

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The simulation of aircraft engine control system is one of the aircraft engine reliability engineering research.Because the engine in accelerating the process，must ensure that the engine does not surge，does not appear over-temperature，we analyze the accelerate process. The steady-state and dynamic models for a separate exhaust turbofan engine are presented by utilizing component characteristics. The use of the Matlab language and its libraries compile the Newton -Raphson algorithm based on the steady state，and steady -state simulation，obtain the relationship between a high-pressure speed，low speed，thrust and other performance parameters and fuel supply. Achieve the dynamic simulation of a turbofan engine using Matlab （Simulink）by researching Iterative method，give the performance in the case of accelerated oil change. Finally，by analyzing the surge margin of three different acceleration time，we draw the influence of different acceleration time to surge.

Analysis of users'behavior on WLAN of aircraft GU

GU Zhao-jun,ZHAO Yi,WANG Shuang

2013, 31(3):  40-44. 

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With the popularity of wireless networks,the analysis of the users' online behavior has become into an important way for all units to improve service quality and increase the benefits of growth. An overview of Web log mining concepts,methods and steps are provided. And to the users' visiting behavior on WLAN of aircraft,we work on the data p-reprocessing. Combining the passengers' seat numbers with users' basic information,and classifying the passengers into different types. Through calculating and analyzing the users' accessing interests,we finally make a conclusion of the interest distribution of different types.

Continuous method for solving 0-1 linear programming

LIU Shan,ZHANG Lin-ling,HAO Li-dong,CAO Sheng-wen

2013, 31(3):  45-49. 

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To optimize the 0-1 linear programming,a method of penalty function is proposed. According to the features of the 0-1 linear programming optimal value,the penalty function is added with the target function and the 0-1 discrete model is changed into the continuous model which is nonlinear equally. The nonlinear model is solved by Fmincon function of Matlab. The results with example calculation and comparison with other algorithms show that this method is feasible and effective. This method is applied to the actual aircraft scheduling and the result is satisfying.

Tensile performance of bonded scarf repair of composite panel

JI Zhao-hui,LIU Kuo,LI Na,YU Ge

2013, 31(3):  50-53. 

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Scarf repair of composite material has been proved to be an advanced repairing technology,which consists of beveled joint and ladder joint. The effect of different repairing structure on mechanical properties of beveled joint scarf repair is researched. The tensile properties of repaired composite laminating with slope ratios of 1:10,1:20,1:30 and 1:40 are studied respectively;meanwhile,the location of its fracture is summarized. The results show that the tensile strength of the scarf repaired specimen with the slope ratio of 1:30 is the best. Plus patch can improve the tensile strength of the specimen,and the appropriate number of the plus patch is 2. The fracture types mainly include degumming fracture and complement-chip fracture.

Study on performance of HVOF WC composite coating with lubrication phase

WANG Zhi-ping,LU Peng-cheng

2013, 31(3):  54-57. 

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By adding MoS₂ in WC-10Co-4Cr matrix，the WC-10Co-4Cr/MoS₂ matrix self-lubricating composite coating are prepared by HVOF. The microstructure and material phases of coatings adding different content of MoS₂are analysed comparatively with SEM and XRD. Focusing on the abrasive wear experiments，the mechanism of MoS₂ on the tribological properties of HVOF WC coating and its microhardness are studied and tested respectively. The results show that a small part of the added MoS2 transforms into a new state and the rest of it enters into the WC coating gap，then the coatings microhardness is slightly lower. The abrasive wear mass loss and wear resistance of the coating containing MoS₂ are effectively reduced and improved respectively under the same experimental conditions. WC-10Co-4Cr/MoS₂ composite coating has a good performance of self-lubricating，and the grain friction and wear properties of WC-10Co-4Cr/15wt.% MoS₂ matrix self-lubricating composite coating become the best.

Stress modes in hybrid stress finite elements of magneto-electro-elastic materials

QING Guang-hui,SONG Jia-lin

2013, 31(3):  58-61. 

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A hybrid stress finite element formulation for magnetoelectro-elastic materials is derived and then on the basis
of the boundary displacement field assumed previously，the generalized assumed stress matrixes of 3D-8
nodes hybrid stress finite element and 3D-20 nodes hybrid stress finite element are derived by employing the
iso-function method. Thus it provides the theoretical basis for establishing the hybrid finite stress element
model of magneto-electro-elastic materials. Finally，taking the 3D-8 nodes hybrid stress finite element as
example，a finite element analysis is performed to a magneto-electro-elastic material laminates and a perfect
result is obtained.

Research and modification of jet fuel consumption evaluation index based on ridge regression

LI Xiao-jin,ZHANG Die

2013, 31(3):  62-64. 

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Along with the constant increase of China air transportation turnover volume，jet fuel consumption continues to rise. However，as the jet fuel price and environmental costs(i.e. from carbon trade schemes or taxes)are higher and higher，airlines have to take good measures on fuel-saving. To evaluate the jet fuel consumption of airlines more precisely，this paper studies the existing evaluation index of fuel consumption，per ton-kilometer，based on the 1981-2010 statistical data of China air transportation with least square method，introduces the index of taking off and landing fuel consumption，solves multicollinearity by method of ridge regression and achieves standard ridge regression equation. The results show that the fuel consumption when taking off and landing is higher than when cruising，and introducing the index of taking off and landing fuel consumption is more in line with the actual situation of China air transportation.