Journal of Civil Aviation University of China

Entire life cycle performance of one engine based on power margin

LIN Da-jin,CAO Hui-ling

2013, 31(4): 1-5.

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With the increasing of using time,it gets urgent to research the whole life performance of all the optional ARRIEL2S series engines. Aiming at the whole life performance parameter variation characteristics of the ARRIEL2S series engine,the Power Assurance Check(PAC)data are processed with probable error theory,the engine total lifetime performance index changing trend is described in stages, and the ARRIEL2S engine wholelifetime performance characteristics are revealed,offering advantageous basis for engine monitoring. The extension hypothesis of PAC interval from 20hrs to 40hrs is proposed and demonstrated,providing a clear and feasible direction for saving the operating cost of this series engine.

Design of fault diagnosis system for aircraft engine ignition component

TIAN Li-qiang,LI Xiao-hui,LIU Cheng-zong,SHI Xu-dong,WANG Li-wen

2013, 31(4): 6-9.

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Aircraft engine ignition component is the core of the engine. Whether the engine can run safely and efficiently depends on the rationality and reliability of ignition component. For ensuring the normal running of ignition component and improving the safety as well as the continuing airworthiness of the aircraft，it is highly meaningful to do the research of the faults diagnosis of aircraft engine ignition component. Focusing on the aircraft engine ignition component fault diagnosis，the fault feature library is built，basing on the secondary voltage waveform generated from aircraft engine ignition component failures. With the library and shape matching approach，the fault diagnosis system can collect ignition voltage waveform and the corresponding characteristic parameters，then the detected waveform can be compared with the fault feature library, in which way the fault type can be determined.

Aero-engine noise source identification based on microphone array DAMAS

YAN Guo-hua,REN Sheng,WANG Yu-chen

2013, 31(4): 10-14.

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In order to implement noise source identification technique of a new generation engine，and to learn basic characteristics of aero-engine noise source,the noise data are processed with the component noise decomposition method. Basing on the noise data,the noise source identification system is developed;the beam forming method results processed with DAMAS are employed as intermediate sound source to obtain the required sound source information and to make the processed results more accurate. The engine noise data verifies the validity and feasibility of the microphone array technology and the noise identification system.

Kinematics analysis and simulation for aircraft surface cleaning manipulator based on D-H

JIN Yu-yang,GAO Qing-ji,TIAN Liu-fen,XIAO Yao,LUO Qi-bing

2013, 31(4): 15-18.

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Regarding unstructured characteristics of aircraft surface,serial mechanical manipulator used for aircraft cleaning is designed,DOF and structural configuration of mechanical manipulators are confirmed,directkinematics and inverse kinematics are analysed with the improved D-H method. Trajectory planning of mechanical manipulators is simulated by Matlab and the results show that the kinematics analysis is correct.

Study on methods for improving the anti-pumping performance of airport cement concrete pavement

LUO Yong, YUAN Jie

2013, 31(4): 19-22.

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Pumping is a common defect of cement concrete pavement,and it would further cause the void defect,which has much effect on the loading capacity of pavement structure. Through analyzing the formation mechanism of pumping,this paper proposes three measures to improve the anti-pumping performance of airport concrete pavementin structural design. These measures are increasing the thickness of pavement,increasing the joint load transfer capacity and increasing base strength. Using the finite element software,the effects of these different measures are analyzed. The result is that increasing joint load transfer capacity is the best,increasing the base strength takes second place,and increasing the thickness of pavement is the worst.

Efficient method for multi-thread text drawing based on OpenGL

WU Ren-biao,WU Hai-ning,QU Jing-yi,JIA Yun-fei

2013, 31(4): 23-26.

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The OpenGL Library has not offer the function of text display and processing directly. Literature 4 provided a method of OpenGL drawing text based on GDI,but the efficiency was low and occupied too much of CPU time.Considering the feature of Windows multi-threading mechanism,some improvements are made,and a new method for text drawing in OpenGL based on multi-thread is proposed. This method can effectively utilize the advantages of multi-core processor,and add obvious advantages to high requirement of real-time or large quantities of text data drawing. Experimental results show that the application of this method can improve text drawing efficiency and improve user爷s experience.

Design for fast acquiring of high dynamic GPS signal based on FPGA

HU Tie-qiao,MENG Tian-tian

2013, 31(4): 27-31.

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A realization scheme of hardware receiver system using for the fast acquiring of high dynamic GPS signal is proposed. According to the acquiring speed requirements of the GPS receiver and the hardware platform,this scheme chooses 2 sets of average samples among 5 sets after the averaging sampling technique processing. It realizes the real-time acquiring of the single satellite GPS signals in cost of small accuracy decline. The simulation results and the hardware implementation results of the high dynamic GPS signal show the validity and the feasibility of the method.

Availability prediction of advanced receiver autonomous integrity monitoring

NI Yu-de,ZHU Jin-fang

2013, 31(4): 32-37.

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Advanced receiver autonomous integrity monitoring (ARAIM) is an extension of single-frequency RAIM. The real-time and predicted algorithm for ARAIM vertical protection level (VPL) is given based on the analysis of VPL and effective monitor threshold （EMT）. For LPV-200 approach，the ARAIM availability for single constellation is studied first，then the research of ARAIM availability for the condition of dual-constellation and multi-satellite failures is focused on. The worldwide availability of ARAIM is simulated，as well as the ARAIM availability for the area of the western route of China，and the simulation statistic for worldwide ARAIMavailability is made.The results show that the coverage rate of RAIM 99.9% availability can reach 100% for the condition of dualconstellation and dual-frequency，which fully meets the requirements of integrity for LPV-200 approach.

Behavior based safety for air trafic controllers

WANG Yan-qing,WU Wei-jie

2013, 31(4): 38-40.

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In order to reduce the rate of unsafe events caused by the air traffic controllers爷individual unsafe behaviors,behavior based safety(BBS)are applied to strengthen accident prevention system. Based on the characteristics of the air traffic control system,the rules and the implementation plan are established. It is found that the ten controllers' safety behavior index rises from 65.82% to 72.79% after implementation for 16 weeks,showing a big benefit. With continuous improvement in management system and hardware system,BBS can be used as an effective way to enhance controlling performance on the part of air traffic controllers.

Industrial aviation regionalization based on grey constellation cluster

WU Wei-wei,FU Cong

2013, 31(4): 41-46.

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General aviation has strategic significance for national economic construction,social development and public service,especially for industrial aviation,an important part of general aviation. Due to various geography and economy in different regions in China,there can be references for national policy making and market development guiding focusing on the regionalized distribution characteristics of China's industrial aviation.Meanwhile,because of the supplies shortage of general aviation information,major demand for industrial aviation is discussed based on grey constellation cluster.

Analysis of air China's financing structure

SUN Xin-xian,YANG Kai-yun

2013, 31(4): 47-51.

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Air China's financing structure is analyzed in order to improve itself and reduce financial risk. Basing on the Pecking Order Theory and comparative analysis approach,some problems could be found and the reasons are analyzed. With consideration of these problems and reasons,some suggestions are proposed from the perspectives of company and government to improve Air China's financing structure,to strengthen government's supervision and to reduce government's intervention,etc. Financing structure is significant to companies' financial cost and risk,operating capacity,profitability and company value. The analysis of Air China's financing structure is referential to its perfection.

Influence of EU emissions trading system for Chinese macroeconomy

LI Hang,SUN Wei,LIU She-xuan

2013, 31(4): 52-56.

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In 2005,the European Union started to implement the emissions trading scheme. Its implementation will be a serious constraint to China's rapid development of air transport,thereby affecting the macro-economic operation. Under this background,studying the EU ETS to China's economy has large significance. Macroeconomic indicators are separated by use of the VAR-IRF model to explain and reveal the extent,duration and the possible consequences of the impact of the EU ETS on the economy. The results show that changes in the EU ETS tradable carbon-emission-future prices will be in a certain period of time resulting in price increases and even inflation,money supply decreases,as well as foreign trade fluctuations,and ultimately affect the normal operation of China's macroeconomy.

Causality relationship between price and throughputs in domestic passenger market of Civil Aviation in China

LI Xiao-jin,XIA Bao-bing,ZHANG Qing

2013, 31(4): 57-59.

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The relationship between transportation price and throughputs in the domestic passenger market of civil aviation in China is studied.The annual data from 1989 to 2007 are collected firstly. Then the data balance is tested with the unite root test of level test and difference test. Finally,the relationship between the two variables is tested with Granger causality test method. The results show that there is a Granger causality relationship between transportation price and throughputs.That is to say,the change of transportation price can lead to the change of throughputs distributed. The lag phase of transportation price爷s impact on amount of throughputs distributed is two to three years,and the influence degree was gradually weakened in the forth year. The result is similar to the fact of development regularity of civil aviation industry and the result provides a theoretical basis for the formulation of the Civil Aviation fare,prompting the civil aviation industry to further develop the market share through the price scheme. It is beneficial to improve the market share of turnover as well as civil aviation transportation,and enhance the competitiveness in the same industry.

Rough analysis model based on prior probability dominance relation

TAO Zhi,BIAN Wen-jing

2013, 31(4): 60-64.

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A decision analysis model based on prior probability dominance relation is proposed to solve multi-attribute decision making problems with preferential and incomplete information. Firstly,in order to avoid the limitations of the extended dominance relation and limited extended dominance relation,the concept of prior probability dominance relation is presented and the rough approximations of knowledge are obtained based on the limitations.Then,compared with the extended dominance relation and limited extended dominance relation,the classification based on the prior probability dominance decision analysis model is more realistic and fits intuitive feeling better. Finally,the example shows the feasibility and effectiveness of the proposed method.

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