Table of Content

15 October 2013, Volume 31 Issue 5

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Civil Aviation

Research on correction of ADS-B trajectory based on basic flight models

ZHANG Zhao-yue,DU Hai-long,GAO Chun-yan

2013, 31(5):  1-4. 

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In order to improve the accuracy of the aircraft monitoring,and to obtain the accurate flight track,ADS-B track correction approach based on basic fight model is put forward to solve the problem of abnormal track in ADS-B monitoring process. The algorithm makes full use of ADS-B flight data information and establishes the flight calculation model and trajectory identification model. Finally the feasibility of the algorithm is validated by using real data. The result shows that this method can accurately and fast correct the track information in level flight,turning and climbing process;meanwhile,it can effectively improve the accuracy of the flight track monitoring.

EMD denoising with multiple clear iterative interval-thresholding and its application

DU Bei,LI Meng

2013, 31(5):  5-8. 

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Aiming at improving the EMD denoising performanc for the Mie scattering radar signals,a multiple clear iterative interval-thresholding(EMD-MCIIT)is used in EMD denoising. The multiple IMFs is firstly employed and the alter function is used to change the noise signals,and then the signal is denoised by the iterative interval-thresholding. Through simulation and the experiment of real radar returning signals,it turns out that compared with the traditional EMD threshoding methods the proposed approach can denoise effectively and the SNR is improved. Therefore,the demonstrated technique has a promising future.

Design of small magnetic heading system (MHS)based on AVR32

DU Hai-long,ZHANG Zhao-yue,XU Xiao-xu

2013, 31(5):  9-13. 

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In the case of small angle pitch and roll，a small magnetic heading measurement system is designed to solve the problems of large volume and weight，high power consumption，complex of error compensation algorithm and high price in the existing magnetic heading measurement system. The system makes the error compensation come ture by using constitute digital solvable platform，which consists of 32 bit high-speed processing chip with DSP instructions(AVR32UC3B0256),a new inclination sensor（SCA100T）and a solidstate magnetic sensor (HMC1022). The experimental data show that the maximum error value of the magnetic heading measurement is ±1.4 in the level of the state when pitch angle is less than 30°or roll angle is less than 35°，the magnetic heading output error changes very little as the angle increases the maximum error are 3.7°and 2.8°respectively；when pitch angle exceeds 30°，or roll angle exceeds 35°，the magnetic headingoutput error increases rapidly. The results show that the system is capable to calculate magnetic heading angle more accurately in the case of small angle pitch and roll.

Aircraft fuel tank fire safety analysis based on FMEA

SONG Biao,WANG Xu,ZHANG Huan

2013, 31(5):  14-18. 

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Since 1959,there have been seventeen aircraft fuel tank lighted accidents,showing that the fuel tank lighted accidents are catastrophic in aircraft safety operation process. These accidents always attract high attention in aviation safety field. Federal Aviation Administration (FAA)continuously fixes the airworthiness rules to satisfy the aircraft safe operation by reducing these risks,but Advisory Circular(AC)is short of systematic analysis. Based on accident investigations,main influencial factors of the fuel tank fire safety are electrical arcs and sparks,filament heating,friction sparks,and hot surface ignition or auto-ignition. And the fuel tank fireproof function devices are quantified. Firstly,with Failure Mode and Effects Analysis(FMEA),each of the function equipments is analyzed to find out the failure mode in different risk status. Secondly,the failure mode level in Risk Priority Number is quantified by three elements method risk state evaluative criteria. At last,according to the component failure mode,tree graph analysis method is employed to manage the fuel tank inside and outside ignition source function elements. Based on the initial analysis of the composites fuel tank special failure mode,a systematic analysis method of the aircraft fuel tank fire safety is proposed.

Analysis on aircraft engine advisory circular based on citation index

BAI Jie,WU Yan-song,WANG Wei

2013, 31(5):  19-23. 

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At present，the research of advisory circulars is limited to only one or several advisory circulars，citation index is introduced to analyze the advisory circulars of aircraft engine overall，presenting an integrated analytic method based on citation index to study the advisory circulars. Firstly the advisory circulars of one Federal Aviation Regulation is chosen as the study object，citation network diagram is obtained according to the mutual reference relations between advisory circulars，then the advisory circulars are analyzed combining with evaluation indicators'qualitative analysis and quantitative analysis on the basis of citation network diagram. Finally，the advisory circulars of this regulation is taken for practical annlysis，verifing the feasibility of this method.

Optimizing dynamic balancing of aeroengine based on genetic algorithm

QU Hong-chun,CUI Xiu-feng

2013, 31(5):  24-26. 

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Based on the frequent malfunction of areoengine,excessive vibration of N1 rotor is researched with dynamic balancing. According to the disadvantage of repeatedly starting，core ideology of influence coefficient is adopted,and holospectrum analyzing is built with rotor model,counterweight based on genetic algorithm is optimized to reduce the starting frequency of areoengine. There is a deeply sound application prospect on lowering the expense of areoengine maintenance.

Distribution model of aircraft emission in civil airports

CAO Hui-ling,RAO De-zhi,LIANG Da-min

2013, 31(5):  27-29. 

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According to ICAO's standard of Landing and Take-off cycle,the aircraft's paths of landing and take-off in airports are simplified . The process to calculate the pollutant emission index(EI)of aircraft emissions has been got in the original work,combined with fuel flow(F)during process of the aircraft landing and take-off,the emission intensities of approach,taxi,take-off and climb are calculated. Based on the Gaussian point source diffusion formulation,the line source diffusion model is integrated,with correction of the parameters the distribution model of aircraft emission in the airport is established.

Failure analysis of B737-300 airplane's automatic pressurization system

MENG Qing-xin,ZHANG Chang-yong,ZHAO Fei

2013, 31(5):  30-33. 

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Reliable operation of pressurization system is critically important for the crew's life safety. To quickly and accurately determine the failure of pressurization system and improve the efficiency of routes troubleshooting,the fault of B737-300 aircraft's automatic pressurization system is chosen to introduce the basement and method of fault tree establishment,making qualitative and quantitative analysis for the reliability of pressurization control system. This method has been initially verified in the process of practical routes troubleshooting,and has big significance in improving the efficiency of pressurization system's troubleshooting.

Energy consumption analysis method of airport terminal buildings based on eQUEST

WANG Wei,WU Jing

2013, 31(5):  34-37. 

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The software of eQUEST is firstly used in the energy analysis of airport terminal building,which has high calculation speed and rich output data;mean while the results are so close to the actual energy consumption that the software is very suitable for airport terminal building's energy analysis. With eQUEST airport terminal building's design and operation schemes,such as selections of the palisade structure,air conditioning and lighting systems parameters,can be further optimized with aim of energy conservation.

Evaluation criteria of grouting engineering for airport composite pavement

CHAI Zhen-lin,YUAN Jie,LUO Yong

2013, 31(5):  38-42. 

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FWD deflection evaluation methods can not be applied to composite pavement grouting engineering as the asphalt concrete material modulus changes with temperature. Based on a composite pavement grouting engineering of a Shanghai 4E airport,a calculation method for load modification factor and temperature modification factor is proposed,meanwhile,a method for composite pavement grouting effect evaluation based on FWD deflection test is obtained. Engineering example shows that this method can meet the needs of composite pavement grouting effect evaluation.

Design of ODN-based data center

HUANG Yun,JIN Gu

2013, 31(5):  43-48. 

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The coverage of fiber network upon the whole city would undoubtedly prompt the interconnection among individuals and organizations. Civil airports usually adopt Fiber to the Home (FTTH)as the solution of fiber coverage. The construction of FTTH with low cost and high efficiency should take all network concept,product option and project implementation into consideration. Taking the PDS system of Xiaoshan International airport as background,and focusing on planning,material selection and construction of Optical Distribution Network(ODN),ODN construction research has been conducted.

Civil Aviation Management

Appraisal of airport operation safety performance based-BSC

WANG Yong-gang,SHAN Fang-fang,WANG Can-min

2013, 31(5):  49-53. 

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In order to meet the requirements which is proposed by ICAO that airports should assess the safety performance,an airport operations safety performance evaluation model is established with the Balanced Score Card(BSC)which has relevance with safety performance management. The model includs 4 first-level indicators,which are operation management,safety management,external management,study and development,those indicators are consist of 21 second-level indicators. In order to reduce the subjective factors effect of the expert judgments during the Analytic Hierarchy Process(AHP),the fuzzy triangular number is introduced into the AHP,every indicator is given a comprehensive evaluation by the Fuzzy Analytic Hierarchy Process(FAHP). With the comprehensive evaluation of the airport operation safety performance,the first eight second -level indicators are respectively development and update of the rules and regulations, responsibilities allocation and work arrangements,risk management,safety awareness and attitude,organization installation and addition,education and training,safety supervision and inspection,the ability of communication collaboration and information feedback. Basing on one airport's actual situation,by using the fuzzy comprehensive evaluation method,this assessment model is applied to obtain the condition of it's overall safety performance.

Research on China general aviation statistical indicating system

WANG Xia,HAN Sha-sha

2013, 31(5):  54-59. 

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Currently there are many factors that restrict the development of China General Aviation, one important factor that can not be ignored is that it's very difficult to get the statistics of China General Aviation development in the process of industry management and theoretical research. The root cause of this phenomenon is that our country has not established a dedicated general aviation statistical indicators system, the existing indicators are lack of comprehensiveness and availability for analysis, and there is no uniform statistics caliber. for the purpose of statistics available, the concept of General Aviation is redefined, and based on the re-division of general aviation activities, the China General Aviation statistical indicators system is established. The China General Aviation statistical indicators system is consist of three layers, they are the basic statistical index layer,the statistics and analyzes the index layer, and the evaluation of development index layer.

Basic Science

Construction of multiple authentication codes with dynamic senders based on symmetric polynomials over finite fields

CHEN Shang-di,CHANG Li-zhen

2013, 31(5):  60-64. 

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In a group communication system，the basic authentication systems refer to the multi-receiver authentication codes with dynamic senders （DMRA-code）. At present，many scholars have a lot of researches，in which the authentication of source state is restricted as only one. However，in the network communication，there are always scenarios in which multiple source states are required to be authenticated. Based on this problem，a multiple message authentication code with dynamic senders is constructed with symmetric polynomials. In addition，the probabilities of possible attacks are computed to ensure the scheme security.