Table of Content

23 December 2015, Volume 33 Issue 6

Previous Issue    Next Issue

Civil Aviation

Comparative research on one-way and mixed-way en route operating capacity

WANG Li-li, CAO Yu,LI Xin-hua

2015, 33(6):  1-4. 

Asbtract ( 1955 )  

References | Related Articles | Metrics

The growth in demand for civil aviation requires assurance of the airspace capacity. In 2013, with the implementation of“Jing-Kun one-way circulation large-capacity channel”, the research of one-way route has become a hotspot, one of the controversial issues is whether the one-way route has a significant effect for enhancing the capacity. Starting from the definition of route capacity and considering the safe separation distance, impact of intersection and terminal area, an en route operating capacity model is built. Using actual values, the ‘Jing-Kun largecapacity channel'one-way and mixed-way operation capacity values are calculated and compared. The study provides a theoretical base for the adjusting plan of en route network being implemented.

Research on editing method of A320MMEL based on operational requirements

CHU Shuang-lei,LIU Fei,WEI Zhi-qiang

2015, 33(6):  5-8,27. 

Asbtract ( 2550 )  

References | Related Articles | Metrics

Master minimum equipment list is an important technical manual of civil aircraft to meet the releasing condition and realize fault release. After explaining the purpose and significance of MMEL,a preliminary study is conducted on compilation regulations,compilation basis,preparation process and contents of A320 aircraft master minimum equipment list which uses ATA100 as the top-level specification. MMEL involving restrictive conditions are mainly discussed;in addition to the necessary working device,other equipment restrictions,aircraft performance limitations,flight operation procedure limitations,meteorological condition restrictions and other restrictions are included. Specific methods about the preparation of China's civil aviation MMEL are proposed. A suggestion is made about the compilation of large-size civil aircraft MMEL.

Research on digital model reconstruction of aircraft engine blades

ZHANG Xue，WANG Hao，DUAN Jun-ping

2015, 33(6):  9-12. 

Asbtract ( 2089 )  

References | Related Articles | Metrics

A modeling method for aircraft wing icing is proposed. With the analysis of droplet trajectory and icing critical conditions of ice nucleation,growth of icing frosting and icing under two conditions are analyzed. Internal quality frost heat transfer equation and surface heat balance equation are built,meanwhile,the ice thickness and ice growth model about temperature,humidity and surface temperature is conformed and aircraft ground icing simulation is carried out.

Modality and resonance analysis of civil aero-engine fan blade

QU Hong-chun,HUANG Yuan-qiang,WANG Tao,WANG Wei-ran

2015, 33(6):  13-16. 

Asbtract ( 2435 )  

References | Related Articles | Metrics

A method of finite element analysis based on modality analysis theory with equipment and ANSYS software is used to study a fan blade. According to its inherent frequency and modal shapes under different speeds,the result is figured that maximum blade deformation generally occurred at the tip or on the leading edge,and its location could be found in modal shape. After making Campbell map to analyze its vibration characteristics,there are four resonance points exist in the range of first-order and second-order. The four resonance points and the blade's rotation margins show that the fan blade meet requirement of 10% vibration margin. This method could supply theoretical basis for blade design,performance evaluation and fault diagnosis.

(a. Civil Aviation ATM Institute,b. Sino-European Institute of Aviation Engineering,CAUC,Tianjin 300300,China)

WANG Jian，NI Yu-bo

2015, 33(6):  17-21. 

Asbtract ( 2604 )  

References | Related Articles | Metrics

The binocular stereoscopic vision technology could be used to locate targets on an aerodrome. To ensure positioning targets,the pixels on images from two vision sensors should be matched precisely. Combining with the advantage of SIFT and an epipolar line constraint equation,a method of pixel matching is proposed. Using this method,it can not only ensure the accuracy of target matching,but also automatically find out the feature point of aircraft which is useful for position and calculation.

Safety evaluation of aircraft taxiing conflict based on Bayesian network

SHI Zhi-jian,WANG Hua-wei

2015, 33(6):  22-27. 

Asbtract ( 2371 )  

References | Related Articles | Metrics

With the rapid development of civil aviation,the heavy airport surface traffic flow may cause serious safety
hazard to the operation of airport. As is known,this problem is more serious in hub airports. In order to analyze
the safety hazard of airport surface effectively,the Bayesian network model is applied to the safety evaluation of
aircraft taxiing conflict. By analyzing the factors that cause safety accidents,the fault tree of aircraft intersection
conflicting accident on taxiway is put forward. Then the Bayesian network model of this accident is established
based on FTA according to the transformation algorithm. Before the analysis,according to the historical
recording of one hub airport's safety accidents and the review of references,the prior probability of root nodes
are derived by utilizing empirical analysis method and expert grading method. Then,the GeNIe software is used
to calculate the posteriori probability values of different nodes. Two-way reasoning technology and sensitivity
analysis are used to predict and diagnose accidents. As a result,we can find out the key factors of aircraft taxiing
system and propose corresponding measures so as to reduce the accident rate. Finally,the analysing results
show that the factors which have greater influence on the aircraft taxiing safety are training and management
factors,pavement layout factors. Therefore the airport departments should pay more attention to them
emphatically. In conclusion,a comprehensive application of diagnostic reasoning and causal reasoning is used
to achieve a combination of qualitative and quantitative analysis of aircraft taxiing safety.

Engineering and Technology

Polarized imaging system for multimodal finger-feature acquisition

YANG Jin-feng,Li Cheng-shang,Shi Yu-kun

2015, 33(6):  28-31,41. 

Asbtract ( 1941 )  

References | Related Articles | Metrics

How to obtain stable and clear biometric image is always the key issue in the field of biometric technology. The polarized imaging system for finger -feature acquisition can capture fingerprints,finger -vein and finger -knuckle-print biometric images simultaneously and has following advantages:a. this system can automatically adjust the locations of finger vein and finger-knuckle-print cameras to make the ROI (region of interest)at the center of imaging plane;b. the multispectral light beams can be controlled when acquiring multispectral image;c. the polarized light can effectively reduce image noise.

Management Science

Passenger throughputs forecast model research under competition in airports of Shanghai,Nanjing and Hangzhou

CAO Tian-jie

2015, 33(6):  32-36. 

Asbtract ( 1988 )  

References | Related Articles | Metrics

Taking the competition between nearby airports into consideration during passenger throughput forecast,the general non-linear differential equations with eight different modes about the passenger throughputs in airports of Shanghai,Nanjing and Hangzhou are firstly presented based on the population dynamics theory with competition and addition of constants in classical differential equations. Then an optimization method is presented to estimate the parameters in the equations based on the least square method. In the method the parameters are estimated one by one in some cycles. Lastly the passenger forecast in airports of Shanghai,Nanjing and Hangzhou is performed by using the presented model. It can be seen from the results that the model can reflect the relationships among the three airports and the developments of them.

Flight capacity evaluation of private pilot based on analytic network process

CHEN Bin

2015, 33(6):  37-41. 

Asbtract ( 1822 )  

References | Related Articles | Metrics

It is important for flight instructors to evaluate student pilots accurately and develop a training program aiming at shortcomings of them and help to improve the flight safety. A multiple attribute decision making method (ANP,analytic network process)is introduced to set up the practical evaluation model of private pilots'flight capacity on the basis of Practical Test Standards (PTS),and then all the evaluation indices and their weights are figured out by using superdecision. Results help to evaluate the practical capacity of student pilots accurately.

Study on influencial mechanism of aviation strategic alliance stability based on structural equation modeling

ZHAO Gui-hong,WANG Ting,Zheng Xing

2015, 33(6):  42-46. 

Asbtract ( 1984 )  

References | Related Articles | Metrics

Based on the analysis of influencial factors of aviation strategic alliance stability,the specific assets invested in the alliance and the relationship capital within the alliance are established as the exogenous latent variables;meanwhile,the potential opportunism riskand the range of alliance are constructed as the endogenous latent variables. Through field research and surveys,structural equation modeling is used to analyze the data,showing that the relationship capital,specific assets and opportunism riskimposed an impact on the range of airline alliance and eventually affected the stability ofairline alliance.

Basic Science

Construction splitting of authentication codes fromprojective space over finite field

CHEN Shang-di,ZHANG Xiao-lian

2015, 33(6):  47-49,64. 

Asbtract ( 1817 )  

References | Related Articles | Metrics

In traditional authentication codes,messages are determined by source state and encoding rule. However,the source state can produce more than one messages under the same encoding rule in reality. Splitting authentication codes are produced in this situation. The main focus of this research is the construction of new splitting authentication codes. Based on subspace structures from projective space over finite fields and basic counting theories,two splitting authentication codes splitting are constructed,and their size parameters are computed.Assuming that the encoding rules are chosen according to a uniform probability distribution,the probabilities of a successful impersonation and a successful substitution by the opponent are computed. Results indicate that the newly constructed codes can effectively resist the enemy爷s impersonation and substitution attack.

Simplified interval B-spline wavelet on interval hybrid stress element

QING Guang-hui,ZHANG Chun-chao

2015, 33(6):  50-54. 

Asbtract ( 1648 )  

References | Related Articles | Metrics

Combining with the hybrid stress finite element theory,based on 2-order/4-order 0 scale wavelet functions,a type of shape function is presented and the process of computer is reduced. The shape function can overcome the difficulty of unknown number increase exponentially with 2 to the power of n. In order to verify the correctness of current formulation,the median displacement and stress of 2 -D elastic rectangular plate under uniformly distributed load is analyzed with different meshes. With the same mesh,the results of 4-order wavelet function are more accurate than that of 2-order wavelet function.

Generalized linear synchronization of different complex networks with time-varying delays

GONG Chang-zhong,LI Fei-yan

2015, 33(6):  55-60. 

Asbtract ( 1738 )  

References | Related Articles | Metrics

Generalized linear synchronization of different complex networks with time-varying delays is introduced. Based on Lyapunov stability theory,some generalized linear synchronization sufficient conditions are derived by adaptive control method. Furthermore,each network with time -varying coupling delays and time -varying delays in dynamical nodes may have different dimensions and its topological structure is also nonidentical. Nodes in either network may have identical or different dynamics. A numerical simulation example is also provided to testify the rationality of the current method,demonstrating that the synchronization rate is affected by adaptive law strengt

Construction of compressed sensing matrix based on affine singular linear spaces

GAO You,WANG Gang

2015, 33(6):  61-64. 

Asbtract ( 1856 )  

References | Related Articles | Metrics

A compressed sensing matrix based on correlations of subspace flats in the affine singular linear spaces is constructed and the coherence of the matrix is computed. Meanwhile,the maximum sparsity of the matrix is obtained. Finally,a comparision is made with the matrix constructed by Ronald A DeVore based on polynomials over finite fields and the maximum sparsity of the current matrix is better than that of the matrix constructed by Ronald A DeVore when the efficiencies of the two matrices are equal.