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    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2021, 42 (4): 0-0.  
    Abstract589)      PDF(pc) (54091KB)(1220)       Save
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    Current status and prospect of overseas research on aeronautical fatigue
    SUN Xiasheng, SU Shaopu, SUN Hanbin, DONG Dengke
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2021, 42 (5): 524791-524791.   DOI: 10.7527/S1000-6893.2020.24791
    Abstract1330)   HTML57)    PDF(pc) (17003KB)(1169)       Save
    Fatigue is one of the key factors affecting the performance of aircraft in research or service. In this article, firstly, the aeronautical accidents caused by fatigue were quoted as clues to state the evolution of structural strength design concept and research situation at each specific period. Meanwhile, international aeronautical fatigue research and their significant development as well as the future developing directions in areas since 21 century has been reviewed and evaluated in the aspects of structural long-life design, fatigue analysis approaches and tools, full-scale structural fatigue testing technology, structural health monitoring and life extension of aging aircraft. Conclusively, considering the current problems and potential development directions, the challenges resisting the realization of high requirement on the long life, lightweight and high reliability of future aircraft design were pointed out on four topics:aeronautical fatigue on evaluation basic research, design and application research, testing evaluation and digital technology, which provides technical materials for the development of aeronautical fatigue.
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    Research progress of corrosion simulation of aircraft structures
    HUANG Hailiang, CHEN Yueliang, ZHANG Zhuzhu, ZHANG Yong, BIAN Guixue, WANG Chenguang
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2021, 42 (5): 524026-524026.   DOI: 10.7527/S1000-6893.2020.24026
    Abstract815)   HTML9)    PDF(pc) (8386KB)(1162)       Save
    Current environmental adaptability assessment of military aircraft is usually carried out by means of outdoor exposure and laboratory acceleration. However, changes in structure design often necessitate reexamination test, which is both time and labor consuming. Corrosion simulation uses the finite element method or boundary element method to accurately predict the corrosion results in a relatively short time with basic electrochemistry theories, gaining favors from scholars home and abroad and finding applications in some fields in the US and European countries. This paper first focuses on the analysis of the current situation of simulation research on the common corrosion forms of aircraft at home and abroad, including galvanic corrosion, pitting corrosion, crevice corrosion and stress corrosion. The basic theories of corrosion simulation are then summarized, with the advantages and disadvantages of the mature commercial software of corrosion simulation compared. Finally, we point out four research difficulties of corrosion simulation, including dynamic interface tracing, multi-scale and multi-physical field corrosion simulation, corrosion simulation standardization, and engineering application in the field of aviation, hoping to provide a directional reference for further exploration of corrosion simulation.
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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
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    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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    Research progress and prospect of fatigue and structural integrity for aeronautical industry in China
    WANG Binwen, CHEN Xianmin, SU Yunlai, SUN Hanbin, YANG Yu, FAN Junling
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2021, 42 (5): 524651-524651.   DOI: 10.7527/S1000-6893.2020.24651
    Abstract880)   HTML51)    PDF(pc) (27012KB)(1055)       Save
    In China, as the improvement of aeronautical industry, fatigue and structural integrity become one of the key problems that affect the life, safety and reliability of aircraft structures. After years of hard-working, aircraft design philosophy evolved gradually from static strength to safe-life, and now to fatigue and structural integrity as a guide. Aircraft structural integrity program has been implemented successfully into structural development for several new types. The service life, reliability and economy of the new generation aircraft structure have been improved significantly. However, with the improvement of aeronautical technology and the development requirements for new aircrafts, many new problems emerged in this area. From the perspective of aeronautical industry, this paper combs the progress and main achievements of aeronautical fatigue research in China, and focuses on the research status and engineering applications in the aspects of material/structure/process, analysis and evaluation method, fatigue test technology and service life management since 2000. Finally, some aeronautical fatigue research directions need to be focused on were proposed in order to provide reference for the further development of domestic aeronautical structures.
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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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    Sonic boom inversion technology based on inverse augmented Burgers equation
    Yiran GU, Jiangtao HUANG, Shusheng CHEN, Deyuan LIU, Zhenghong GAO
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2023, 44 (2): 626258-626258).   DOI: 10.7527/S1000-6893.2021.26258
    Abstract122)   HTML0)    PDF(pc) (9209KB)(773)       Save

    Sonic boom has always been one of the obstacles restricting the development of supersonic airliners. Hence, the low sonic boom design technology is particularly important in the design of supersonic airliners. The inverse augmented Burgers equation can invert the mid-field sound pressure signal to the near-field and provide optimization objectives for the low sonic boom inverse design. This study uses the operator splitting technique and the pseudoparabolic equation method to numerically solve the inverse Burgers equation and calculate the corresponding reversed equivalent-area. With the assistance of the three standard examples, we investigate the convergence of the numerical method, the accuracy of the solution, and the calculation accuracy of the inversion technique at different field heights and different rolling angles. Based on the characteristics of the inverse augmented Burgers equation, the feasibility of setting target waveforms in the mid-field for the inverse design method is discussed, and the propagation characteristics of high-frequency components in the sound pressure signal are studied. The research shows that the above method can accurately complete the inversion calculation of the sound pressure signal from the mid-field to near-field, and that using mid-field target waveforms instead of ground target waveforms can reduce the influence of the inversion distance on the inversion calculation process.

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    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (3): 0-0.  
    Abstract288)      PDF(pc) (50325KB)(714)       Save
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    Parallel HVDC electric power system for more-electric-aircraft: State of the art and key technologies
    ZHANG Zhuoran, XU Yanwu, YU Li, LI Jincai, XIA Yiwen
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2021, 42 (6): 624069-624069.   DOI: 10.7527/S1000-6893.2020.24069
    Abstract1164)   HTML25)    PDF(pc) (17725KB)(710)       Save
    The integration of onboard secondary energy is gradually realized by the More Electric Aircraft (MEA), improving the efficiency, reliability, and safety of energy utilization. The High-Voltage DC (HVDC) power supply system with outstanding advantages such as lightweight, low loss, and high reliability can, in principle, realize easier parallel operation of the Electric Power System (EPS), enabling the expansion of the power supply capacity in a multi-engine/multi-generator layout, and hence uninterrupted power supply. In addition, both the electric power quality and reliability of the EPS are improved. The characteristics and advantages of the HVDC EPS are analyzed in this paper, followed by a summary of the research status and the key technical issues of the HVDC parallel EPS. A dual-channel HVDC parallel EPS based on novel doubly salient brushless DC generators is proposed and implemented to achieve current sharing control of the system, and the dynamic responses during sudden load changes, paralleling in, and splitting out are examined. The research has proved that the HVDC parallel EPS provides good steady-state accuracy and dynamic performance, exhibiting important value in the MEA or All Electric Aircraft (AEA) applications. The dynamic behaviors, the modeling method, and the protection logic of the HVDC parallel EPS still require further research.
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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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    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2021, 42 (5): 0-0.  
    Abstract379)      PDF(pc) (43405KB)(618)       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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    Review of distributed hybrid electric propulsion aircraft technology
    ZHU Bingjie, YANG Xixiang, ZONG Jian'an, DENG Xiaolong
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (7): 25556-025556.   DOI: 10.7527/S1000-6893.2021.25556
    Abstract998)   HTML22)    PDF(pc) (14513KB)(567)       Save
    Distributed hybrid electric propulsion system has great potential and advantage in development of general electric aviation. By the optimization of secondary power system, hybrid electric technology can not only heighten the utilization efficiency of energy, but also satisfied the distributed arrangement of power system for higher propulsive efficiency. The paper firstly summarized the current major types of electric aircraft, reviewed the history background of distributed electric propulsion aircraft. Then, the research status of distributed hybrid electric propulsion aircraft technology is summarized, this part mainly discussed the distributed layout technology of propulsion system, type-selection design of hybrid electric propulsion system, modeling and energy management of hybrid electric propulsion system, and so on. The key technologies of distributed hybrid electric propulsion at home and abroad are discussed fully. Eventually, combined with the research of the team, the difficult point problems and solutions of distributed hybrid electric propulsion aircraft are discussed in detail, including dynamic management strategy of energy based on complex system optimization control, optimal energy distribution prediction model driven by historical big data, and principle prototype designing of distributed hybrid electric propulsion system. The main content of this paper clarify the design thoughts and analysis method for distributed hybrid electric propulsion system and energy arrangement, which can provide references for the research of electric propulsion aircraft technology.
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    Current status, challenges and opportunities of civil aero-engine diagnostics & health management Ⅰ: Diagnosis and prognosis of engine gas path, mechanical and FADEC
    CAO Ming, HUANG Jinquan, ZHOU Jian, CHEN Xuefeng, LU Feng, WEI Fang
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (9): 625573-625573.   DOI: 10.7527/S1000-6893.2021.25573
    Abstract688)   HTML35)    PDF(pc) (7660KB)(550)       Save
    The engineering advancements during the last two decades have presented opportunities as well as challenges for the Engine Health Management (EHM) system development of civil aero-engines. This R&D review provides an in-depth discussion on EHM needs, gaps and potential solutions/future R&D development directions, focusing on the "up-stream" EHM development modules: Engine gas path diagnostics and prognostics, mechanical diagnostics and prognostics, FADEC diagnostics and prognostics. Results shows the Unscented Kalman Filter (UKF) method and deep-learning neural networks have shown promises on improving the engine gas path diagnostics accuracy; composite fans have found widespread applications in turbo-fan engines; powder metallurgy has seen more and more applications on fabricating aero-engine parts with complex shapes; the accuracies of metal particle sensing technologies have witnessed significant improvements, with technology readiness level matching the aero-engine needs, and paved the way for fusion diagnostics with vibration signal. The result also show that electrification and intelligentization trends of FADEC system presents new challenges for the diagnostics of the traditionally centralized control architecture.
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    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (6): 0-0.  
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    Research status and prospect of fault diagnosis for gas turbine aeroengine
    LIN Jing, ZHANG Boyao, ZHANG Dayi, CHEN Min
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (8): 626565-626565.   DOI: 10.7527/S1000-6893.2021.26565
    Abstract748)   HTML78)    PDF(pc) (5160KB)(515)       Save
    Gas turbine engine is a comprehensive embodiment of the level of national science, technology and industry. Fault diagnosis is an important guarantee for its safe and reliable operation and an essential indicator of engine advancement. However, due to the complicated structure, highly integrated system, harsh service environment, variable mission profiles, the constraints of limited online testing conditions, and the poor supportability of diagnostic information acquisition, the fault diagnosis for aeroengine faces multiple challenges. In this paper, the research status in China and abroad is firstly reviewed and analyzed from three aspects: gas path analysis and performance evaluation, mechanical fault diagnosis and information fusion. Then, the exciting key problems and challenges in the current research are pointed out. Finally, the future development trends are discussed.
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    Development of aircraft structural fatigue and structural integrity: Review
    CUI Degang, BAO Rui, ZHANG Rui, LIU Binchao, OUYANG Tian
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2021, 42 (5): 524394-524394.   DOI: 10.7527/S1000-6893.2020.24394
    Abstract1268)   HTML31)    PDF(pc) (9154KB)(495)       Save
    As the main factor affecting the safety of structures, the structural design and strength analysis of aircraft has developed from static strength design to safety-life design and damage-tolerance design, and further to the durability concept and aircraft structural integrity, during which the design and technique philosophies keep improving and undergo qualitative changes. However, the present understanding towards structural integrity in engineering practice is limited to the level of product development and testing, hindering its significance at a further level. This paper first introduces the development of aircraft structural design from static strength design to structural integrity design, the basic concept of aircraft structural integrity, and the main contents and key points of Aircraft Structural Integrity Program (ASIP). Moreover, the promotional transition from the traditional specification for analysis and testing within the design phase to the present one for process control and management within the whole product lifecycle is addressed by elucidating the "Five Tasks". Finally, two typical successful ASIP applications involving the design, verification and maintenance of aircraft structural integrity are presented as examples. Through the basic concepts and development of the main design philosophies, this paper shows the qualitative change of aircraft structural safety strategies from limited application within the design and development phase to thorough application for process control within the full lifecycle, and points out the trend that structural integrity philosophies are developing from experiment-based systematic approaches to digital ones.
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    Plasma synthetic jet actuator for flow control: Review
    ZHOU Yan, LUO Zhenbing, WANG Lin, XIA Zhixun, GAO Tianxiang, XIE Wei, DENG Xiong, PENG Wenqiang, CHENG Pan
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (3): 25027-025027.   DOI: 10.7527/S1000-6893.2020.25027
    Abstract711)   HTML27)    PDF(pc) (23280KB)(487)       Save
    Plasma Synthetic Jet (PSJ) actuators are a type of flow control device which generates high-temperature and high-speed zero-net mass flux jets using gas heating and pressurization of arc discharge in a semi-closed chamber. With advantages of high jet velocity, strong boundary layer penetration ability, fast response, wide actuation bandwidth and no moving parts, this device shows promising applications as a novel active flow control actuator. This paper presents a review of the recent progress in the research on plasma synthetic jet actuators. The optimization designs of plasma synthetic jet actuator systems for improving control authority, increasing energy efficiency and expanding environmental adaptability are summarized, the innovative research methods used in the investigations introduced, and the energy efficiency characteristics and the influence of parameters of the actuator presented. The applications of plasma synthetic jet actuators in various situations such as crossflow interaction, flow separation control, shock control and control of shock wave/turbulent boundary layer interaction are then reviewed. The interaction mechanisms between plasma synthetic jet and crossflow, separation bubbles and shock waves are discussed, followed by the analysis of the effects of momentum injection, blast waves and local heating of plasma synthetic jet in active flow control. The research trends are finally discussed.
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    Development and applications of airport avian radar: Review
    CHEN Weishi, HUANG Yifeng, CHEN Xiaolong, LU Xianfeng, ZHANG Jie
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (1): 24758-024758.   DOI: 10.7527/S1000-6893.2020.24758
    Abstract1785)   HTML37)    PDF(pc) (36464KB)(483)       Save
    Avian radar has become an important bird situation observation tool in airport bird strike avoidance. The origin of avian radar technology is first introduced, followed by analysis of the target characteristics of flying birds in terms of the target echo amplitude, flight speed, flight height, trajectory characteristics and micro-Doppler characteristics. Four typical airport avian radar systems, including Merlin radar, Accipiter radar, Robin radar and Aveillant radar, and the research status of the domestic avian radar technology are then introduced. Key radar technologies such as antenna, radar waveform, target detection and tracking, target recognition and classification are analyzed, and the performance of typical avian radar systems compared. In addition, the applications of avian radar are discussed with respect to the fusion of radar and photoelectric technologies, the linkage of bird detection and repellent, and the bird information analysis. Conclusions are finally drawn and prospects are made.
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    Multibody separation dynamics: Review
    SONG Wei, AI Bangcheng
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (9): 25950-025950.   DOI: 10.7527/S1000-6893.2021.25950
    Abstract396)   HTML4)    PDF(pc) (12397KB)(482)       Save
    As an important dynamic problem, multibody separation dynamics often exists in the separation system of multibody vehicles in aerospace and weapon fields. Different from multibody system dynamics generally studying the motion law of multiple flexible and rigid bodies connected with each other, multibody separation dynamics is a highly integrated point of aerodynamics and flight dynamics. After unlocking and separation, the multibody vehicles no longer restrain or contact with each other, leading to air medium interaction between the multibody vehicles. The multibody separation process involves both aerodynamic interference (multibody aerodynamics) and relative motion between multiple bodies. This paper summarizes the key scientific problems and related technical difficulties of multibody separation dynamics according to the research requirements of multibody aircraft in the fields of aerospace and weapon systems. Firstly, the problems and main characteristics of several typical multibody vehicles (such as aircraft stores, multistage vehicles, aircraft with fairing, and multimissile vehicles) are presented, followed by a summary of the theoretical and experimental prediction methods of multibody separation dynamics. Then, the advantages and disadvantages of different research methods are analyzed. Finally, some views and future prospects are proposed.
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