提升综合技术和管理能力,研发高性能航空发动机--访国家“千人计划”专家,南京航空航天大学教授胡忠志

正胡忠志HU Zhongzhi国家"千人计划"专家Expert of Thousand Talents Plan南京航空航天大学教授Professor of Nanjing University of Aeronautics and Astronautics胡忠志,教授,博士毕业于加拿大英属哥伦比亚大学,国家"千人计划"特聘     

A STUDY ON MECHANICAL MODEL OF THE HELICOPTER "GROUND RESONANCE

The key problem to the calculation and optimization design of the helicopter "Ground Resonance" is to correctly build up a mechanical model. In the past, the literature was only concerned with the lag modes of the rotor blade and the flap modes were neglected. But such approaches should be reconsidered now. In order to study the influences of rotating multiblades rotor on the degrees of freedom and also the flap 'Ground Resonance" of a helicopter, it is necessary to consider not only the lag degrees of freedom but also the flap degrees of freedom. Using Lagrangian equation a dynamical equation of the space model for helicopter "Ground Resonance"is deduced for the first time. Some computation results show that the mechanical model including both lag DOF and flap DOF is more reasonable.     

OPTIMIZATION DESIGN FOR SUPPRESSING "GROUND RESONANCE" OF THE HELICOPTER

The design problem for suppressing "ground resonance" of the helicopter, with which few researchers have concerned so far, is studied in this paper. Based on the ideas of pole region placement in control theory and of optimization, the method for optimally designing the stiffness and damping parameters of the system with satisfying specified requirements is presented. The effective design criteria and procedures are presented according to the principle of "ground resonance".For illustrating the method presented in this paper three typical calculation modes are studied. The results are satisfactory.     

DOMESTIC BRIEFS

Since May, China Eastern RegionalAdministration of ATMB of CAAC set up"ATM Open Day" for airlines, both domes-tic and foreign, to strengthen the air-groundconnection.     

Improved NSGA-Ⅱ Multi-objective Genetic Algorithm Based on Hybridization-encouraged Mechanism

To improve performances of multi-objective optimization algorithms,such as convergence and diversity,a hybridization-encour-aged mechanism is proposed and realized in elitist nondominated sorting genetic algorithm (NSGA-Ⅱ).This mechanism uses the nor-malized distance to evaluate the difference among genes in a population.Three possible modes of crossover operators-"Max Distance","Min-Max Distance",and "Neighboring-Max"-are suggested and analyzed.The mode of "Neighboring-Max",which not only takes advantage of hybridization but also improves the distribution of the population near Pareto optimal front,is chosen and used in NSGA-II on the basis of hybridization-encouraged mechanism (short for HEM-based NSGA-Ⅱ).To prove the HEM-based algorithm,several problems are studied by using standard NSGA-II and the presented method.Different evaluation criteria are also used to judge these algorithms in terms of distribution of solutions,convergence,diversity,and quality of solutions.The numerical results indicate that the application of hybridization-encouraged mechanism could effectively improve the performances of genetic algorithm.Finally,as an example in engineering practices,the presented method is used to design a longitudinal flight control system,which demonstrates the obtainability of a reasonable and correct Pareto front.     

自主创新,开拓航空发动机零件再制造之路——访中国工程院院士,航空发动机领域专家向巧

正向巧XIANG Qiao中国工程院院士Academician of Chinese Academy of Engineering"两机"重大专项工程副总设计师Deputy Chief Designer of National Major Project of Aeroengine and Gas Turbine航空发动机领域专家,军队科技领军人才,中国科协常委、学术交流专门委员会委员、女科技工作者专门委员会委员,联合国教科文组织奥尔堡中心咨询委员会委员,中共十八大代表,全国劳动模范。现任中国航空发动机集团公司总经理助理,科技委副主任,"两机"重大专项工程副总设计师。长期从事航空发     

飞机机体使用寿命定义

 <正> The maximum service period reached safely and economically by frames of an airplane is defined as service life. This definition is different from "safe life" or "economic life" specified in MILA-008866A or MIL-A-87221, respectively.It is explicated that service life is related to the overall process of production activity from material to operation management. The paper has also pointed out the way of obtaining the service life.     

走进国际化视野的南科大机械制造——访南方科技大学机械与能源工程系融亦鸣教授

正融亦鸣RONG Yiming中组部"千人计划"入选者Expert of Thousand Talents Plan南方科技大学机械与能源工程系系主任Department Head of Mechanical and Energy Engineering,Southern University of Science and Technology教授,博士生导师,美国机械工程师学会会士(ASME Fellow)。曾任美国伍斯特理工学院(Worcester Polytechnic     

RFID技术助力智能制造进程——访青年长江学者、华中科技大学教授陶波

正陶波TAO Bo教育部"长江学者奖励计划"青年学者Young Chang Jiang Scholar华中科技大学教授Professor of Huazhong University of Science and Technology华中科技大学机械科学与工程学院教授、博士生导师,主要研究方向为智能制造与机器人技术。中组部首批"青年拔尖人才支持计划"、教育部首批"长江学者奖励计划"青年学者、教育部新世纪     

Implement This and Next Year''''s Work Outline to Promote Every Aspect of Civil Aviation Work

The National Civil Aviation Directors' and General Managers' Conference was held in Beijing on July 25.The main tasks of this conference are: having an in-depth learning of the important "Three Represents" Thought of Party Secretary General Jiang and the important May 31 speech, carrying out the important instructions on civil aviation work given by central government leaders, further implementing this year's civil aviation work plan, summarizing work in the first half of     

A SYNTHETIC RESEARCH FOR AIRCRAFT ACTIVE FLUTTER SUPPRESSION

In this paper a new idea, based on discussing the essence of flutter, to investigate flutter problems is proposed that we only study a few modes of an aeroelastic system instead of studying the whole. In the light of this, an approach to analysing flutter characteristics which combines the merit of graphic and analytic methods, is presented. Also an optimal cost function with clear physical meaning which can overcome some inherent drawbacks of linear quadratic technique, is developed. The paper has shown a numerical example of an elastic wing, in which some comparisons between the approach and "V-G" method for calculating the critical point (Vf,wf ) are carried out as well.     

He Zong Lian Heng to Jointly Create Prosperity

In the middle of June, an airline consolidation and alliance seminar with the theme "HeZong Lian Heng to Jointly Create Prosperity" was held in Beijing. The seminar which wasco-sponsored by the Policy and Regulation Department of CAAC and Civil Aviation Man-     

Emotion Makes Life Better——An interview with Wolff Heinrichsdroff, vice president of international ltd

MontbIanc InternationaI Itd held its grand awardgiving ceremony at"the Commune at the Foot of theGreat Wall"on May 18,2004,China's first privatearchitectural art museum.Wolff Heinrichsdroff.vicePresident of Montblanc International Itd.came fromGermany to chair the ceremony in Beijing.     

THE CANARD-WING INTERFERENCE AND STALL SAFETY OF LIGHT CANARD AIRCRAFT

In this article, the interference between canard and wing is discussed on the basis of wind-tunnel test, with a brief review of the development of aerodynamic configurations of AD-100 / 200 (two light canard aircraft designed by NAI) .The safety against stall of a canard is also discussed based upon flight test.The rule "canard stall first"is introduced as an effective measure to improve safety against stall. It has been pointed out that the rule may threaten the flight safety at low-altitude. Finally,what a designer can do to remove the threat is presented.     

Reorganization of China''''s Civil Aviation Takes Shape

Following a long period of consideration and discussion, thereorganization of airlines and air service enterprises under the directadministration of CAAC has finally been launched.On April 27, the CAAC held a meeting posting the reorganization planbased on the principle of "self-willingness of the enterprises, guidance of thegovernment and giving play to strong points of groups". According to theplan, new airline groups will be organized, based on Air China, China Easternand China Southe…     

Application of Active Flow Control Technique for Gust Load Alleviation

A new gust load alleviation technique is presented in this paper based on active flow control. Numerical studies are conducted to investigate the beneficial effects on the aerodynamic characteristics of the quasi "Global Hawk" airfoil using arrays of jets during the gust process. Based on unsteady Navier-Stokes equations, the grid-velocity method is introduced to simulate the gust influence, and dynamic response in vertical gust flow perturbation is investigated for the airfoil as well. An unsteady surface transpiration boundary condition is enforced over a user specified portion of the airfoil’s surface to emulate the time dependent velocity boundary conditions. Firstly, after applying this method to simulate typical NACA0006 airfoil gust response to a step change in the angle of attack, it shows that the indicial responses of the airfoil make good agreement with the exact theoretical values and the calculated values in references. Furthermore, gust response characteristic for the quasi "Global Hawk" airfoil is analyzed. Five kinds of flow control techniques are introduced as steady blowing, steady suction, unsteady blowing, unsteady suction and synthetic jets. The physical analysis of the influence on the effects of gust load alleviation is proposed to provide some guidelines for practice. Numerical results have indicated that active flow control technique,as a new technology of gust load alleviation, can affect and suppress the fluid disturbances caused by gust so as to achieve the purpose of gust load alleviation.     

更正声明

<正>《航空学报》2014年第35卷第12期刊登的"2014年《航空学报》、CJA领跑者5000提名论文"动态消息中,原载"《航空学报》和Chinese Journal of Aeronautics入选21篇文章"更正为"《航空学报》和Chinese Journal of Aeronautics入选24篇文章"。以下为遗漏的3篇入选论文信息。     

Investigation of the role of aziridine bonding agents on the aging of the composite solid rocket propellant(CSRP)

The role of bonding agents on the aging characteristics is one of the important research topics.Aging program of the prepared propellant samples was conducting as follows:Five samples,two free of bonding agents,and three containing an aziridine based bonding agents(MAPO,HX-752,MAT4),four samples based on different bonding and curing agents all were aged at 70 ℃.The prepared bonding agent "MAT4" gave remarkable improvements and resulted in highly stable mechanical properties comparing with HX-752 or MAPO.The selected bonding agents family inhibited the rate of decomposition of the propellants during the aging periods and supported the propellant matrix against decomposition at the elevated temperatures.      

The Night Of Hennessy Paradis Extra Cognac

The world-known Hennessy Paradis Extra Cognaclaunched its"dazzling night"on the evening of May 22 tolet guests enjoy to their hearts'content the fine wine andthe charming glamour of the diamond evening dress. A liquid,dating back to the 18th century,was called     

发展先进陶瓷及其复合材料提升核心竞争力——访教育部“长江学者”、哈尔滨工业大学贾德昌教授

正贾德昌JIA Dechang长江学者特聘教授Chang Jiang Scholar哈尔滨工业大学特种陶瓷研究所所长;工信部先进结构功能一体化材料与绿色制造技术重点实验室主任Director of Institute for Advanced Ceramics,Harbin Institute of Technology;Director of Key Lab of Adv Struc-Funct Integ MaterGreen MFG Tech,MIIT国家杰出青年基金获得者,科技部中青年科技创新领军人才,中组部首批"万人计划"入选者,第十二届全国政协委员。从事先进陶瓷与陶瓷基复合材料及其在航天防热部件上的应用等研究。主持和参与各