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    Development of future fighters
    YANG Wei
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2020, 41 (6): 524377-524377.   DOI: 10.7527/S1000-6893.2020.24377
    Abstract10969)      PDF(pc) (4047KB)(13438)       Save
    Recent years have witnessed extensive discussions on the change of warfare forms and the development of post-4th generation fighters against the background of great power competition and batches of 4th generation fighters entering service. This paper reviews the origin of fighter generation classification and the driving elements behind each generational leap, outlining the evolution of Observe, Orient, Decision, Act (OODA) loops for air combat and proposing the essence of OODA 3.0. After a summary of the supportive and progressive relations among mechanization, informatization and intelligentization, it explores the dialectical relationship among autonomy and manned/unmanned, as well as that among platform, system of systems, and distributed operation, followed finally by a discussion of an agile and efficient development approach of future fighters.
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    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (10): 0-0.  
    Abstract501)      PDF(pc) (271947KB)(1171)       Save
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    Achievements and predicaments of CFD in aeronautics in past forty years
    YAN Chao
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (10): 526490-526490.   DOI: 10.7527/S1000-6893.2021.26490
    Abstract8977)   HTML48)    PDF(pc) (26853KB)(5782)       Save
    Euler/RANS-based CFD methods have been rapidly developed and widely used in aeronautics since the 1980s, making remarkable achievements and playing an important role in aircraft development and aerodynamic research. This article reviews the achievements of CFD in military and civil aeronautics in the past four decades and analyzes its shortcomings, particularly the problem in separation flow simulation due to the turbulence modeling. The development of aeronautics CFD is discussed from the perspectives of turbulence models and numerical schemes. Finally, a brief conclusion and suggestions on future development are presented.
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    Development status, challenges and trends of strength technology for hypersonic vehicles
    SUN Cong
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (6): 527590-527590.   DOI: 10.7527/S1000-6893.2022.27590
    Abstract1030)   HTML286)    PDF(pc) (26942KB)(897)       Save
    As a type of hi-tech weapon, hypersonic vehicle plays an important strategic role in national security and benefits. It has now become a research hotspot in the field of aerospace, and the competition is becoming increasingly fierce all over the world. Advanced material and structure design is a basic key technology to support the development of hypersonic vehicle. The strength of materials and structures in extremely severe service environments is still a key issue restricting the development of this type of aircraft. This paper reviews the structure strength problems and evolution characteristics in the field of hypersonic vehicles in the past few decades. Combined with the current vehicle model development demand and technology development trend, this paper analyzes the current situation and shortcomings of structure strength technology in supporting the development of hypersonic vehicles and discusses the new requirements, new characteristics and new methods of strength problems in this field in the future. Finally, the future development direction in the field of hypersonic vehicle structure strength is proposed after summarization.
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    Technical development of variable camber wing: Review
    WANG Binwen, YANG Yu, QIAN Zhansen, WANG Zhigang, LYU Shuaishuai, SUN Xiasheng
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (1): 24943-024943.   DOI: 10.7527/S1000-6893.2020.24943
    Abstract1327)   HTML80)    PDF(pc) (36682KB)(1131)       Save
    The Variable Camber Wing(VCW) remains a research hot-spot as it aims to ensure that aircraft acquire optimal aerodynamic efficiency in various flight conditions. The benefits brought by VCWs are firstly presented, and the demands of VCWs from different types of aircraft are classified and thoroughly described. The developing process of VCWs in the past decades are then reviewed in terms of the leading edge and the trailing edge, respectively, and the current major obstacles in application are listed. Further research directions are finally suggested.
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    Additive manufacturing—Revolutionary technology for leading aerospace manufacturing
    LI Dichen, LU Zhongliang, TIAN Xiaoyong, ZHANG Hang, YANG Chuncheng, CAO Yi, MIAO Kai
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (4): 525387-525387.   DOI: 10.7527/S1000-6893.2021.25387
    Abstract1385)   HTML58)    PDF(pc) (2000KB)(852)       Save
    The additive manufacturing technology has the advantage of rapid manufacturing of single-piece and small-batch complex structures used in aerospace applications, and integration of design, materials and manufacturing will be the direction for its future development. This paper analyzes three aspects of application and development of additive manufacturing in the field of aerospace, focusing on the manufacturing of aero-engine turbine blades, high-performance Poly-Ether-Ether-Ketone (PEEK) and its composites, continuous fiber reinforced resin composites, and space 3D printing. The research status of additive manufacturing technology at home and abroad and in Xi'an Jiaotong University is also introduced. The application of additive manufacturing technology for turbine blades can effectively improve the manufacturing efficiency and reduce costs. In the future, this technology can meet the manufacturing of high-performance superalloy and ceramic matrix composite blades. The additive manufacturing of high-performance lightweight polymer PEEK and its composites are applied in forming of structure parts with high mechanical properties and radio absorbing functional parts, which will change the existing design and materials and promote the integrated development of structure and function. The additive manufacturing of continuous fiber reinforced resin composites will drive the new development of forming of moldless fiber composites, and 3D printing in space will change the aerospace manufacturing model in the future. The additive manufacturing technology will revolutionize the aerospace manufacturing technology.
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    Future wireless communication assisted by intelligent reflecting surface: State of art and prospects
    ZHU Zhengyu, WANG Zixuan, XU Jinlei, WANG Zhongyong, WANG Ning, HAO Wanming
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (2): 25014-025014.   DOI: 10.7527/S1000-6893.2021.25014
    Abstract3374)   HTML290)    PDF(pc) (8157KB)(2357)       Save
    With the further development of related research on metamaterials and metasurfaces, the concept of Intelligent Reflecting Surface (IRS) was proposed. IRS uses a large number of passive reflective elements integrated on the plane to intelligently configure the wireless propagation environment through software programming, so as to improve the performance of the wireless communication system. Compared with the traditional relay base station, IRS has the advantages of low cost, low power consumption and easy deployment. Therefore, IRS and IRS-assisted wireless communication are one of the important technologies in the future development of the communication field. By investigating and sorting out the current status of IRS research, the development and applications of IRS and IRS-assisted wireless communication are introduced in terms of the basic concepts, development history, characteristics and advantages of IRS, and the basic concepts and research directions of IRS-assisted wireless communication. Future development of IRS is also discussed.
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    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (3): 0-0.  
    Abstract288)      PDF(pc) (50325KB)(714)       Save
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    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (2): 0-0.  
    Abstract284)      PDF(pc) (83925KB)(624)       Save
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    Recent development of unmanned aerial vehicle swarms
    JIA Yongnan, TIAN Siying, LI Qing
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2020, 41 (S1): 723738-723738.   DOI: 10.7527/S1000-6893.2019.23738
    Abstract2355)      PDF(pc) (4041KB)(1885)       Save
    Swarm as a typical collective behavior is omnipresent in animal kingdom, such as fish schooling, bird flocking, and bee swarming. In a colony, large-scale synchronous behavior emerges by virtue of local sensing and very simple communication rules. Inspired by these collective performances, the swarm of unmanned aerial vehicles is proposed as a new combat pattern. These unmanned aerial vehicles are characterized by large quantity, low cost, high speed, well adaptability, and convenient carried/launched mechanism, contributing to the scale advantage of UAVs and the possession of war initiative In recent years, many military powers, such as China, Russia, United States, have made great effort to the continuous development of swarm-related technology of unmanned aerial vehicles. To resolve the swarming problem of unmanned aerial vehicles, this paper introduces the research motivations of UAVs, summarizing the research approaches from modeling, control protocol, and execution platform. Besides, several classical combat modes and involved key technologies are discussed in detail. Above all, the swarm-related technology has bright application potential in the military area, leading to a brand new combat pattern.
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    Research advances on heat and mass transfer coupling effect at gas-solid interface for thermal protection materials
    ZHAO Jin, SUN Xiangchun, ZHANG Jun, TANG Zhigong, WEN Dongsheng
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (10): 527577-527577.   DOI: 10.7527/S1000-6893.2022.27577
    Abstract385)   HTML31)    PDF(pc) (22053KB)(668)       Save
    Thermal Protection System (TPS) is essential for safe and efficient flying of hypersonic vehicles, and one of the major challenges is the complex non-linear coupling phenomena at the interface between the surrounding high enthalpy non-equilibrium environment and the thermal protection materials. The chemical reactions at the interface, including surface catalysis, oxidation and ablation, are concurrently conjugated with flow and heat transfer at the interface, significantly affecting TPS performance. This paper presents a state-of-the-art overview of flow and heat transfer coupling mechanism investigations at the gas-solid interface for typical thermal protection materials from four categories:experimental, theoretical, multiscale numerical simulation and artificial intelligence methods. A brief summary and outlook of the future challenges for aerothermodynamics research with heat and mass transfer coupling effect at the gas-solid interface is proposed.
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    Technical innovations of the Tianwen-1 Mission
    ZHANG Rongqiao, GENG Yan, SUN Zezhou, LI Dong, ZHONG Wenan, LI Haitao, CUI Xiaofeng, LIU Jianjun
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (3): 626689-626689.   DOI: 10.7527/S1000-6893.2021.26689
    Abstract1078)   HTML76)    PDF(pc) (2192KB)(683)       Save
    Tianwen-1 is the first mission in the world to achieve the three goals of Mars orbiting, landing and roving in one mission, and has made some key-technology breakthroughs. The mission objectives and flight progress are introduced, and eight kinds of innovation achievements and the main technical breakthroughs are comprehensively summarized in this paper. Specifically, the key technologies include the overall design of Mars orbiting, landing and roving objectives strongly coupled, multi-trajectory launch of Earth escape orbit, interplanetary flight and Mars capture, Mars enter, descent and landing, solutions adaptive to Martian harsh environment, 400-million-kilometer communication, advanced payloads of remote sensing and patrol detection, and Mars environmental modeling and ground validation. The complete success of the mission has made China become one of the advanced countries in the field of deep space exploration.
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    Predefined-time attitude stabilization control of receiver aircraft
    WU Cihang, YAN Jianguo, QIAN Xianyun, GUO Yiming, QU Yaohong
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (2): 324996-324996.   DOI: 10.7527/S1000-6893.2021.24996
    Abstract403)   HTML22)    PDF(pc) (4844KB)(596)       Save
    Considering the time-varying rotational inertia, uncertain rotational inertia and wind disturbance of the receiver aircraft, a predefined-time attitude stabilization control strategy for the receiver aircraft during the refueling phase in aerial refueling task is investigated in this paper. First, attitude dynamic model and kinematic models of the receiver aircraft with time-varying rotational inertia, internal uncertainty, and external disturbance are established. Second, to improve the rapidity of attitude stabilization control, a robust sliding-mode attitude stabilization controller is designed on the basis of the predefined-time stability theory. In comparison to the existing control strategies for the receiver aircraft, the proposed controller can ensure that receiver's attitude be stabilized in the predefined time, and the convergence time can be explicitly defined in advance within the allowable range through controller parameters according to the control demand and actuator physical limits. Lyapunov stability analysis and numerical simulation results manifest that the proposed control strategy exhibits excellent performance of attitude stabilization.
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    Miniature fixed-wing UAV swarms: Review and outlook
    WANG Xiangke, LIU Zhihong, CONG Yirui, LI Jie, CHEN Hao
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2020, 41 (4): 23732-023732.   DOI: 10.7527/S1000-6893.2019.23732
    Abstract2362)      PDF(pc) (12788KB)(1840)       Save
    Focusing on the new direction of miniature fixed-wing UAV swarms, this paper summarizes their recent developments from three aspects, i.e, the connotation of the swarm system, the existing typical programs, and the key technologies. After a systematic introduction of the connotation and application advantages of the swarm system, the existing typical programs are summarized from four perspectives: swarm collaborative mode exploration, distributed command system construction, key technology breakthroughs, and swarm verification. The current developments of technical research are reviewed in seven key points, including system architecture, communication and networking, decision-making and planning, aircraft platform, swarm flight, swarm security and swarm command and control. Finally, the future developments in the field of miniature fixed-wing UAV swarms are forecasted.
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    Research progress on dissimilar materials joining
    FENG Jicai
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (2): 626413-626413.   DOI: 10.7527/S1000-6893.2021.26413
    Abstract683)   HTML225)    PDF(pc) (70745KB)(509)       Save
    Dissimilar material structures could realize the combination of dissimilar materials with excellent performance, which improves the flexibility in design and production and meets the demand for function and properties in modern engineering structures. These structures have been widely used in many fields due to their higher technological and economic value. Therefore, reliable joining of dissimilar materials is becoming increasingly important. Nevertheless, the great difference in physical and chemical properties between dissimilar materials poses a huge challenge to achieve reliable joining. This work reviewed the research status and development on brazing, laser welding, electron beam welding, arc welding, and friction stir welding of dissimilar materials in China and abroad. Based on this, summaries and prospects about dissimilar joining are given, which provides a reference for research interests and technology breakthrough in the future study.
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    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (10): 2-0.  
    Abstract175)      PDF(pc) (25160KB)(481)       Save
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    Review of low-frequency unsteadiness in shock wave/turbulent boundary layer interaction
    FAN Xiaohua, TANG Zhigong, WANG Gang, YANG Yanguang
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (1): 625917-625917.   DOI: 10.7527/S1000-6893.2021.25917
    Abstract545)   HTML37)    PDF(pc) (23163KB)(587)       Save
    Shock wave/Turbulent Boundary Layer Interaction(STBLI) is ubiquitous in internal and external of supersonic and hypersonic flow. The physical mechanism of low-frequency unsteadiness, which is found in shock-induced separation and appears as low-frequency shock motion accompanied with the expansion and contraction of the separation bubble, has been disputed. This research field has been widely concerned and studied. The driving mechanism of low-frequency unsteadiness could be generally divided into three categories. Some researchers believed that the source of the low-frequency unsteadiness originated in the upstream boundary layer. On the contrary some scholars held the opinion that the low-frequency dynamics was dominated by intrinsic nature of downstream separation flow. However, some recent researches trended to reconcile these two opposite views, believing that the upstream and downstream mechanisms co-existed with a weighting function depending on the state of the STBLI. The coupling between shock wave and boundary layer was assumed as a dynamics system, which could be represented as a first-order low-pass filter. This system responded selectively to the perturbations below certain frequency regardless of whether they came from upstream or downstream. The above three physical mechanisms are reviewed respectively. In addition, some research areas which need further attentions are present based on the existing results and the authors' knowledge.
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    Key technologies for autonomous cooperation of unmanned swarm systems in complex environments
    XIANG Jinwu, DONG Xiwang, DING Wenrui, SUO Jinli, SHEN Lincheng, XIA Hui
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (10): 527570-527570.   DOI: 10.7527/S1000-6893.2022.27570
    Abstract576)   HTML25)    PDF(pc) (29169KB)(544)       Save
    In complex environments with high dynamics, uncertainty and resource constraints, the unmanned swarm system will face challenges in all fields of the "Observation-Orientation-Decision-Action (OODA)" loop when performing complicated tasks such as collaborative area search and swarm optimal scheduling. To improve the adaptability of unmanned swarm systems to different scenarios, it is necessary to break through the key technologies for autonomous cooperation of unmanned swarm systems in complex environments. Based on the theory of robust autonomous cooperation of large-scale heterogeneous unmanned swarm systems in complex environments, this paper gives a review of the design and modeling methods of adaptive heterogeneous architecture for unmanned swarm systems, and discusses three problems:high-dimensional situation distributed perception and cognition, intelligent decision-making with guiding, trusting and evolving ability, and autonomous cooperative control of the unmanned swarm system in complex environments. Firstly, the research progress of autonomous cooperation of unmanned swarm system in complex environment is summarized. Secondly, the challenges faced by OODA task loop of unmanned swarm system are analyzed. Then, the key technologies involved in autonomous cooperation of unmanned swarm system in complex environment and their progress are reviewed. Finally, the future development of autonomous cooperation of unmanned swarm system is given.
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    Digital twin and its aerospace applications
    MENG Songhe, YE Yumei, YANG Qiang, HUANG Zhen, XIE Weihua
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2020, 41 (9): 23615-023615.   DOI: 10.7527/S1000-6893.2020.23615
    Abstract4375)      PDF(pc) (4740KB)(2321)       Save
    Digital twin, the link between the physical and digital worlds, has currently attracted extensive attention both at home and abroad. Through establishment of a digital model of a physical system, real-time monitoring of the system status, and driving of the dynamic model update to describe and forecast system behaviors more accurately, the online decision optimization and feedback control are realized. In this paper, analyses show that compared with a general simulation model, the digital twin has outstanding characteristics of being centralized, dynamic, and integral. The development of the digital twin requires the support of complex system modeling, sensing and monitoring, big data, dynamic data-driven analysis and decision, and software platform technology. In the field of aerospace, digital twin can be applied to the design, development, manufacturing, assembly, operation and maintenance of aircraft. This article focuses on a case of application of the airframe digital twin to life prediction and maintenance decision, which exhibits advantages of lower maintenance frequencies and maintenance costs compared with the periodic maintenance. Finally, a preliminary application framework of a ground accompanying flight system established for space stations and reusable spacecraft is demonstrated.
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    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (6): 0-0.  
    Abstract311)      PDF(pc) (77175KB)(523)       Save
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