Table of Content

22 June 2015, Volume 33 Issue 3

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Civil Aviation

Cross route collision risk assessment based on improved Event model

CAO Xing-wu,ZHANG Zhao-ning

2015, 33(3):  1-4. 

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Through improved research on the original Event collision risk model,a cross route collision risk assessment model is established. Ellipsoid collision template is used instead of traditional rectangular collision template and generalized Pareto distribution is employed to describe the tail navigation data which can produce larger errors.Collision risk calculation model is derived under this condition. Finally the horizontal overlap probability of cross route is calculated by the improved Event collision risk model. Results show that ellipsoid Event collision risk model based on generalized Pareto distribution has higher accuracy than original Event model and meets the current safety level target.

Study on design of air highway ramp

WANG Li-li, PAN Zhen-qian

2015, 33(3):  5-7,12. 

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As a new type of spatial structure,there are many blanks about its design and operation aspects of air highway,so it is essential to design and improve the structure and rules of air highway gradually. Based on the preliminary planning of China air highway network,it is proceeded to complete the design of ramp. Firstly,according to the European air highway operation and the actual situation of China's route network,the limited distance between adjacent ramps is given,and then the desired airports considering the flights of surrounding airports areselected,as well as their geographical locations and the 150 n mile distance constraints. Finally,in the use of the shortest path model and track angle constraints,the method of ramp design has been found,which will provide theoretical support for China爷s air highway planning and optimization of its operation.

Diagnostic parameters of numerical weather model for aviation operation decision

JIANG Li-hui,CHEN Xing,GUO Wei,YU Liang,Qin Yu-tao

2015, 33(3):  8-12. 

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The severe weather has a strong effect on air transportation. The introduction of numerical weather prediction model for diagnostic analysis would be a good way for the airlines to take effective operational control decisions by improving the accuracy and usefulness meteorological information. The torrential rain occurred in Beijing area is taken for example,the new generation mesoscale WRF model is used to simulate the atmosphere andweather,then the visibility,lifting condensation level,the amount of low cloud and Richardson number are analyzed with simulation results. It is found that diagnostic results and the actual probe data are in good
agreement,so the numerical model can be used to provide more efficient and effective meteorological information when aircraft are taking off,landing and cruising,which will improve the efficiency of controlling and decision-making for air traffic control officers.

Generation and recognition methodology research of aircraft intent description language

MA Lan,ZHANG Ji-chen,CHENG Yi-lin

2015, 33(3):  13-16,27. 

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The current air traffic management system is still relying on voice communication between pilots and controllers to know the aircraft intent information. But there is some instability and ambiguity in the voice communication and a flight safety hazard to a large extent. Aiming at the existing unity and specification problem of aircraft intent research,the way of computer form language grammar is utilized to define and generate the grammar of AIDL. According to the AIDL grammar rules of vocabulary and sentence,the effective way of sentence combination has been realized and the derivation and reduction of AIDL sentence is achieved based on linear grammar. The AIDL sentences are identified by DFA(deterministic finite automata). Therefore,the aircraft intent information is automatically generated corresponding to AIDL sentence,the description of aircraft intent information is standardized and a new method of communication between controllers and pilots is brought up,as a result,the access of aircraft intent information accuracy and timeliness is improved and the possibility of incorrect comprehension of voice communication transmission error is reduced.

Resolving and recombination of civil aircraft airworthiness regulations and certification techniques

YAN Xiang-bin,JIANG Jian-jun,WANG Jun-biao,CAO You-ming

2015, 33(3):  17-22. 

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Aiming at the problem of poor binding force to airworthiness certification activities of airworthiness regulations,a certification mode that can provide an effective knowledge constraint to airworthiness certification activities is established through resolving and recombining the airworthiness regulations and verification technologies.Confirming the supporting role of knowledge to certification activities,a certification knowledge unit is obtained from the established resolving model of airworthiness certification techniques. Furthermore,the certification knowledge unit is obtained from the recombination of certification technique knowledge unit and airworthiness regulation knowledge attribute informations,and its mechanisms in certification activities are analyzed. Example indicates that the recombinational certification knowledge unit can provide efficient trigger to the execution of airworthiness certification activities. The established restrained mode has positive guiding function to the standardization and high efficiency of airworthiness certification activities'execution.

Research on maintenance task analysis（MTA）in civil aircraft type development

MA Lin-long

2015, 33(3):  23-27. 

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Logistics support analysis is one of the significant aspects in RAMS(reliability,availability,maintainability,safety)and product support engineering of civil aircraft. Under the guidance framework of S3000L,the workflow and methods of maintenance task analysis in civil aircraft type development are lucubrated. The prioritization of tasks is analyzed and standard analysis flowchart is firstly studied. Then the task dividing-up methods,the MTN model of subtask sequence relation,and the estimating methods of resource consumption are researched in details. An application example is given for reference in the end.

Supplementary service behavior modeling based on Puny-Agent

LIU Jia-xue,GUO Jin

2015, 33(3):  28-31. 

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Due to the natural complexity of to-be-added working medium of supplementary service simulation as well as its service tasks,basing on the behavioral characteristics of supplementary service,punily defined concept of Agent is introduced and its behavior level output,behavior to achieve the specific process of construction are given. A Hybrid Agent supplementary service repair behavior model is constructed on the basis of puny definition,aiming at improving the maintenance operation training familiarity. And eventually,by simulating the yellow hydraulic accumulator nitrogen filling service instance modeling袁the feasibility and effectiveness are verified.

Civil Aviation

IDEF 3 and DSMin disassembly and assembly process modeling

ZHANG Zhong-hua,GENG Hong

2015, 33(3):  32-35. 

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For the problem of complex disassembly and assembly process and various system models in current aircraft maintenance training, the disassembly and assembly process model of aircraft components is established using the modeling method combining with hierarchical analysis and UML state machine. IDEF3 is used to establish the state, migration and constrained model of disassembly components, the unified expression of removing component model is regulated to improve the modeling efficiency. DSM is employed for the planning of various aircraft components, achieving an orderly logic expression of the disassembly target component, and establishing a high degree of simulation training model. Finally, the disassembly and assembly of a component on aircraft repair training platform is taken as an example to verify the validity of IDEF3 and DSM in the disassembly process simulation.

Discussion on aircraft taking-off by rapid exit taxiway

WANG Wei, LEI Zhen-Jun

2015, 33(3):  36-40. 

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Runway capacity in China's large transportation airports becames more and more insufficient袁and the runway capacity increasing in heavy traffic airports becomes a major issue. How to improve the flexibility of ground dispatching and how to enlarge the runway capacity by using rapid exit taxiway to take off have been systematically discussed. The corrected model of required runway length and time saving for taking-off through rapid exit taxiway are presented. The high efficiency of using rapid exit taxiway for taking-off is verified through analyzing the aircrafts'taking-off flow and taking-off - landing models. The effectiveness to reduce runway occupied time and increase airport capacity by using rapid exit taxiway to take off is proved by example.

Engineering and Technology

Discussion on experimental cooling data management of poor conductor thermal conductivity coefficient

LI Ze-peng,GUO Song-qing,WANG Wei-bo

2015, 33(3):  41-43,47. 

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The computer-aid procedure in dealing with the cooling data with the steady-state method for thermal conductivity measurement based on data analysis and Origin software is introduced. The theory basis fitting the cooling curve with the assist of Origin is derived. According to the Newton's law of cooling,the derived relation between cooling temperature and time is in multinomial form. Therefore,the multinomial fitting is chosen when fitting the cooling curve with the assist of computer and software. And generally,the two order multinomial fitting is enough to meet with the criterion in accuracy.

Suppression method of DME pulse interference based on wavelet transformation

LIU Hai-tao,LIANG Guang-xi

2015, 33(3):  48-52. 

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To solve the problem that L-band digital aeronautical communications system 1 (L-DACS1)receiver is always interfered by DME (distance measuring equipment)pulse signals,which is caused by L-band DACS1 deployed in the gaps between two adjacent channels of DME system in L -band,a DME pulse interference suppression receiver is proposed for L-band DACS1 with wavelet transform denoising method. Utilizing the signal characteristics of L-DACS1 and DME system,the DME pulse signal is reconstructed based on wavelet transform denoising method,and the reconstructed DME pulse signal is eliminated from the received signals in time domain. Simulation results show that the proposed receiver scheme can significantly improve the link transmission reliability under the environment of additive white gaussian noise channel and multipath fading channel.

DPA attack on stream cipher MICKEY-128

ZHAO Hong-xu

2015, 33(3):  53-57. 

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Nowadays,various side-channel attack techniques start to play an important role in cryptography and bring a serious threat on the hardware implementations of cryptographic algorithms. So far,side-channel attacks on block ciphers have been discussed extensively. However,the literature about side channel attacks on stream ciphers is not as much as the other cryptographic algorithms. In this work,a platform based on FPGA is used to drive the MICKEY-128 stream cipher which has been integrated on one ASIC,meanwhile the power traces are collected during the cipher encryption. Afterwards,differential power analysis has been performed to attack the entire secret key. As shown by the results,the complete secret key of MICKEY-128 has been revealed,and by changing the power model and statistical analysis method the attack efficiency can be further improved.

Management Science

Research on computer-aided measurement factor empowerment of air traffic controllers'quality based on entropy method

MOU Long-fang,BAI Peng,MENG Na,LI Ya-rong

2015, 33(3):  58-60. 

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Controllers play an extremely important role in the complex air traffic control system and are the core and most important part of the system. How to measure the quality of air control controller has always been daunting task.Computer-based testing method is adoptied to measure the quality level of controllers. In the computer-aided quality measurement of air traffic controllers,validity and reliability are two important indicators. Factor empower-ment plays an essential role on validity and reliability measuring. The entropy method is used in factor empowerment. Compared with traditional empirical value method,a higher degree of achievement distinction has been reached and it is proofed to be more objective,more fair and easier to operate.

Prediction of business aviation market demand based on improved Grey-Markov model

SUN Ji-hu,ZHANG Jin-jun

2015, 33(3):  61-64. 

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At present,business aviation of China has been rapidly developed,meanwhile it has been constrained by many factors such as airspace management system,industry management standards,infrastructure and so on.Considering this feature,by combining the advantages of both grey prediction and Markov theory,this research attempts to forecast the business aviation market demand in China. Firstly,the GM(1,1)model is established after improving the original time series,and then the predicted value is corrected by Markov model. Results show that the prediction accuracy of improved Grey-Markov model has been further improved. This model has not only the advantages of grey system for short-term trend accurate forecast,but also the accurately predicting advantage of Markov prediction model for volatility data. It overcomes the disadvantages of both the two predicting methods. This data processing method is straightforward and has a relatively high practicability.