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| 1 | Effects of Electron Beam Local Postweld Heat Treatment on Microstructure and Properties of 30CrMnSiNi2A Steel Welded Joints显示文摘To improve the microstructure and properties of the electron beam welded joints, the vacuum or furnace whole post weld heat treatment (FWPWHT) usually should be done on it. The electron beam local post weld heat treatment (EBLPWHT) is a rather new heat treatment procedure that provides the advantages of high precision, flexibility and efficiency, energy saving and higher productivity. In this paper, the microstructure, mechanical properties, fracture toughness and fatigue properties of electron beam welded joints of 30CrMnSiNi2A steel in as-welded (AW) and EBLPWHT conditions have been investigated respectively. The results show that the microstructures of different zones of joints in as-welded condition are changed by EBLPWHT procedure, in which the welds from coarse needle martensite into lath-shaped martensite; the main structures of heat affected zones (HAZ) from lath-shaped martensite into lower bainite. The properties of welded joints can be improved by the EBLPWHT in some extent, especially the fracture toughness of the welds and the fatigue crack resistance of welded joints can be sufficiently improved. However, more appropriate heat treatment parameters of the EBLPWHT have to be studied in order to increase the mechanical properties of base metal near by the HAZ. | CHEN Fu-rong 1, HUO Li-xing 1, ZHANG Yu-feng 1, ZHANG Li 1, LIU Fang-jun 2, CHEN Gang 2 (1. College of Materials Science and Engineering, Tianjin University, Tianjin 300072, China 2. Aviation Techniques Institute of Beijing, Beijing 100024, China) | 2002 | 厦门大学学报(自然科学版)2002，41，S1： | 12 |
| 2 | Modal identification based on Hilbert-Huang Transform of structural response with S VD preprocessing显示文摘In recent years, Empirical mode decompositionand Hilbert spectral analysis have been combined to identifysystem parameters. Singular-Value Decomposition is proposedas a signal preprocessing technique of Hilbert-HuangTransform to extract modal parameters for closely spacedmodes and low-energy components. The proposed methodis applied to a simulated airplane model built in AutomaticDynamic Analysis of Mechanical Systems software. Theresults demonstrate that the identified modal parameters arein good agreement with the baseline model. | Min Zheng Fan Shen Yuping Dou Xiaoyan Yan College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,210016 Nanjing. China | 2009 | Acta Mechanica Sinica2009，25，6： | 7 |
| 3 | Gust response modeling and alleviation scheme design for an elastic aircraft显示文摘Time-domain approaches are presented for analysis of the dynamic response of aeroservoelastic systems to atmospheric gust excitations. The continuous and discrete gust inputs are defined in the time domain. The time-domain approach to continuous gust response uses a state-space formulation that requires the frequency-dependent aerodynamic coefficients to be approximated with the rational function of a Laplace variable. A hybrid method which combines the Fourier transform and time-domain approaches is used to calculate discrete gust response. The purpose of this approach is to obtain a time-domain state-space model without using rational function approximation of the gust columns. Three control schemes are designed for gust alleviation on an elastic aircraft, and three control surfaces are used: aileron, elevator and spoiler. The signals from the rate of pitch angle gyroscope or angle of attack sensor are sent to the elevator while the signals from accelerometers at the wing tip and center of gravity of the aircraft are sent to the aileron and spoiler, respectively. All the control laws are based on classical control theory. The results show that acceleration at the center of gravity of the aircraft and bending-moment at the wing-root section are mainly excited by rigid modes of the aircraft and the accelerations at the wing-tip are mainly excited by elastic modes of the aircraft. All the three control schemes can be used to alleviate the wing-root moments and the accelerations. The gust response can be alleviated using control scheme 3, in which the spoiler is used as a control surface, but the effects are not as good as those of control schemes 1 and 2. | WU ZhiGang1, CHEN Lei1*, YANG Chao1 & TANG ChangHong2 1 School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China 2 The First Institute, Aviation Industry Corporation of China, Xi’an 710089, China | 2010 | Science China(Technological Sciences)2010，53，11： | 6 |
| 4 | ADS-B Data Authentication Based on ECC and X.509 Certificate显示文摘An automatic dependent surveillancebroadcast(ADS-B) system has serious security problems,and the data can be spoofed during broadcasting precise position information of aircraft.A solution of the ADS-B system data authentication based on the elliptic curve cipher(ECC) and X.509 certificate is proposed.It can avoid the key distribution problem by using the symmetric key algorithm and prevent the ADS-B data from being spoofed thoroughly.Experimental test results show that the solution is valid and appropriate in ADS-B universal access transceiver(UAT) mode. | Wei-Jun Pan,Zi-Liang Feng,and Yang Wang the College of ComputerScience,Sichuan University,Chengdu 610065,Chinah the College of Aviation Management,the Civil Aviation Flight University of China,Guanghan 618307,China. | 2012 | Journal of Electronic Science and Technology2012，10，1： | 4 |
| 5 | Synthesis of vertically aligned carbon nanotube arrays on silicon substrates显示文摘The growth of well-aligned carbon nanotube (CNT) arrays using a heat chemical vapor deposition system on silicon substrates is reported. The growth properties of CNT arrays are studied as a function of synthesis conditions. It is found that 750℃ and 10 nm Fe film are suitable conditions for the growth of well-aligned CNT arrays. CNT arrays with a uniform diameter, thick tube wall and firm cohesion to the Si substrate can be grown for C2H2 concentration of 27%. Based on the experiment, the processes of improving the alignment of CNT arrays and cohesion between CNT arrays and Si substrates are discussed. | ZHENG Ruiting1, CHENG Guoan1, PENG Yibin1, 2, ZHAO Yong1, 3, LIU Huaping1 & LIANG Changlin1 1. Key Laboratory of Radiation Beam Technology and Materials Modification of Ministry of Education, Department of Materials Science and Engineering, Beijing Normal University, Beijing 100875, China 2. School of Science, Civil Aviation University of China, Tianjin 300300, China 3. Department of Physics, Nanchang University, Nanchang 330047, China Correspondence should be addressed to Zheng Ruiting | 2004 | Science China(Technological Sciences)2004，47，5： | 4 |
| 6 | DYNAMIC RESPONSE OF ROLLER GEAR INDEXING CAM SYSTEM CONSIDERING CLEARANCE AND MOTOR CHARACTERISTIC显示文摘The dynamic responses of roller gear indexing cam mechanism are investigated .With applying Lagarange equation and Gear method,motion equations of this mechanism including clearance,motor characteristic,torsion flexibility are developed and solved.The results show that clearance affects primarily the response on turret,and has little effects on the responses on rotary table.At the same time,the velocity fluctuation of motor shaft is not serious for the existence of inertia of reducer,and the high frequency of velocity fluctuation of camshaft is related with the torsion stiffness of shaft and the clearance between pairs. | Chang Zongyu Civil Aviation College,Nanjing University of Aeronautics and Astronautics Zhang Ce Yang Yuhu Wang Yuxin Tianjin University | 2001 | Chinese Journal of Mechanical Engineering2001，14，2： | 3 |
| 7 | ADVANCED HIGH GRADIENT TECHNOLOGY FOR CASTING OF SUPERALLOY TURBINE BLADES显示文摘ADVANCEDHIGHGRADIENTTECHNOLOGYFORCASTINGOFSUPERALLOYTURBINEBLADESE.N.Kablov(All-RussianScientificResearchInstituteofAviationM... | E.N. Kablov(All-Russian Scientific Research Institute of Aviation Materials (VIAM) 17 Radio St., Moscow, Russia ) | 1996 | Acta Metallurgica Sinica(English Letters)1996，9，6： | 2 |
| 8 | The Geography of Trade in Goods and Asset Holdings显示文摘 | Aviat A Coeurdacier N | 2004 | DELTA Working Papers2004，，10： | 1 |
| 9 | COMBINED LEGENDRE SPECTRAL-FINITE ELEMENTMETHOD FOR THE TWO-DIMENSIONAL UNSTEADYNAVIER-STOKES EQUATION显示文摘1.IntroductionThereismuchliteratureconcerningnumericalsolutionsofNavier-Stokesequations,e.g.,see[1--4].FOrsemi-periodicproblems,someauthorusedcombinedFOurierspectralfinitedifferenceandFOurierspectral--finiteelementapproximations(see[5--8]).Influiddyn... | Song-man He Cai-ping Yang(Department of Basic Courses, Civil Aviation University of China, Tianjin 300300, China) | 1999 | Journal of Computational Mathematics1999，17，5： | 1 |
| 10 | Guidance Material Microbiological Contamination in Aircraft Fuel Tanks显示文摘 | IATA Aviation Fuel Working Group | 2005 | International Air Transport Association2005，，： | 1 |
| 11 | Distribution Characteristics of Winter Continuous Extreme Low Temperature in China显示文摘[Objective] The research aimed to study the distribution characteristics of winter continuous extreme low temperature in China. [Method] Based on the daily minimum temperature data in winter during 1961-2008 in 195 observatories, the continuous extreme low temperature event (cold night) which happened in winter in China and the distribution characteristics of accumulated temperature anomaly in 48 years were analyzed by using the actual probability distribution threshold method. [Result] Besides in Northeast China, Northwest China and Qinghai-Tibet Plateau where the geographical position was northerly, and the altitude was high, the long-time (above 5 d) extreme low temperature event was also easy to happen in the south of Yangtze River, especially in Guizhou, Guangxi, Hunan and so on. The continuous extreme low temperature event in the middle and lower reaches of Yellow River was the least. Started from the metaphase of the 1980s, the frequency trend of continuous extreme low temperature event decreased. But in 1992, 2000 and 2007, the low temperature event which continued above 7 d was more than the average. The accumulated cold in January in 48 years was the strongest. The second one was in February, and the smallest was in December. The accumulated cold in Northeast China and the north of Inner Mongolia was the biggest in December and January. The accumulated cold in the north of Xinjiang was the biggest in February. In the whole winter, the accumulated cold in Qinghai-Tibet Plateau was the smallest. The chilling injury was easier to happen in Guizhou, Guangxi and Hunan than other south areas in December and February. The occurrence probability of chilling injury in most areas of Szechwan Basin, Yunnan and Qinling Mountains in central China was smaller than that in other areas. [Conclusion] The research provided the reference basis for analyzing the influence of chilling injury on the agriculture in China. | LUO Zhong-hong1, 2, HUANG Jia-you1, JIANG Hang-dong2 1. Department of Atmospheric Science, Physics College, Peking University, Beijing 100871, China 2. Xiamen Air Traffic Management Station of Civil Aviation, Xiamen 361009, China | 2011 | Meteorological and Environmental Research2011，2，4： | 1 |
| 12 | UP in armor显示文摘 | TOENSMEIER PAT AVIATION | 2005 | Week & Space Technology2005，163，10： | 1 |
| 13 | Aging aircraft program:Wide- spread fatigue damage, proposed rule 显示文摘 | Federal Aviation Administration | 2006 | Federal Register2006，74，19： | 1 |
| 14 | Guidance Material on Microbiological Contamination in Aircraft Fuel Tanks显示文摘 | IATA Aviation Fuel Working Group | 2005 | International Air Transport Association2005，，： | 1 |
| 15 | Use of quantitative real-time PCR for studying the dissemination of Leptospira interrogans in the guinea pig infection model of leptospirosis显示文摘 | Lourdault K Aviat F Picardeau M | 2009 | J Med Microbiol2009，58，5： | 1 |
| 16 | Aging aircraft program: widespread fatigue damage, proposed rule显示文摘 | Federal Aviation Administration | 2006 | Federal Register2006，74，19： | 1 |
| 17 | Air traffic services,annex 11 to the convention on international civil aviation显示文摘 | International Civil Aviation Organization(ICAO) | 2001 | Montreal International Civil Aviation Organization2001，13，2： | 1 |
| 18 | Guidance Material on Microbiological Contamination in Aircraft Fuel Tanks 显示文摘 | IATA Aviation Fuel Working Group | 2005 | International Air Transport Association2005，，： | 1 |
| 19 | Maintenance review board procedures, AC 121-22A显示文摘 | Federal Aviation Administration | 1997 | Washington: US Department of Transportation1997，，： | 1 |
| 20 | Report on Aviation Safety Committee on Aeronautics of the Association of the Bar of the City of New York显示文摘 | Aviation Safety Committee on Aeronautics of the Association of the Bar of the City of New York | 1999 | Journal of Air Law & Commerce1999，，64： | 1 |
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