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    Environmental Adaptability Evaluation Model for Stratospheric Airships
    ZHANG Lixue, WANG Zhongwei
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    DOI: 10.7527/S1000-6893.2013.0131
    Review and Prospect of GNSS Receiver Autonomous Integrity Monitoring
    XU Xiaohao, YANG Chuansen, LIU Ruihua
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    DOI: 10.7527/S1000-6893.2013.0081
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (4): 0-0.  
    Abstract306)      PDF(pc) (69143KB)(163)       Save
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    Review of civil airplane landing gear noise study and its control approaches
    ZHAO Kun, LIANG Junbiao, Ivan BELYAEV, Victor KOPIEV, Gareth BENNETT
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (8): 26996-026996.   DOI: 10.7527/S1000-6893.2022.26996
    Abstract296)   HTML7)    PDF(pc) (35695KB)(255)       Save
    The landing gear is a crucial source of the civil airplane noise at take-off and landing, and has been a serious issue for the research field of aerodynamic noise control. After almost half a century study, so far plenty of progress in the field of landing gear noise production reasons and control approaches have been achieved. This paper, to begin with, conducted a quick review of the landing gear noise research history, and made a brief explanation to the noise generation mechanism. Then, the state of art of the landing gear noise reduction technologies at home and abroad was introduced. The corresponding studies were based on different methods including wind tunnel test, flight test, and numerical simulation. The technologies involve faring, pin hole cover, component optimization and air curtain. At last, the research inspiration from home and abroad were discussed, followed by the analysis of current issues. As a consequence, the expectations to the future study on the landing gear noise were made.
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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
    Abstract574)   HTML65)    PDF(pc) (5160KB)(439)       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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    Location privacy protection scheme for unmanned aerial vehicle group based on matrix encryption
    XING Ling, JIA Xiaofan, ZHAO Pengcheng, WU Honghai
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (8): 325386-325386.   DOI: 10.7527/S1000-6893.2021.25386
    Abstract204)   HTML3)    PDF(pc) (5271KB)(67)       Save
    The space-aerial intensive network expands the traditional single-dimensional terrestrial network into a three-dimensional aerospace collaborative network, and the Unmanned Aerial Vehicle (UAV) group technology has become a new technical means for full coverage of complex areas. However, the issue of privacy and security in the processes of information transmission is becoming increasingly prominent. In this paper, we propose a privacy protection method based on matrix encryption, in order to solve the problem that the location privacy is easy to leak when the UAV group collects information. The cloud server because of the communication function is regarded as a trusted third party to carry out two-way information transfer between UAVs and the base stations. Taking advantage of its computing capabilities, the cloud server is used to encrypt information transfer and reallocate tasks randomly. The IDs and tasks are hidden and encrypted doubly according to the k-anonymous algorithm, so as to reduce the attackers’ guesses on the target location information. The algorithm can help the system fend off attacks within the group, because the cloud server can track the target and cancel the identity from the new task list when a malicious node is found. The entropy of IDs and tasks increase as the number of groups increases. Feasibility and effectiveness of the algorithm are verified, which shows that the algorithm can provide effective protection for the location privacy of UAVs.
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    Oscillation characteristics of suction and oscillatory blowing actuator
    SUN Qixiang, WANG Wanbo, HUANG Yong
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (8): 125627-125627.   DOI: 10.7527/S1000-6893.2021.25627
    Abstract213)   HTML9)    PDF(pc) (19489KB)(108)       Save
    Efficient oscillating jet systems need actuators with excellent oscillation characteristics, which requires reduction of the internal flow losses in the actuator to increase the outflow velocity, reduction of the stagnation time of the jet at 0° deflection angle to generate unsteady vortexes in the flow field, increase of the jet deflection angle to enlarge the control area, and the ability to effectively adjust the oscillation frequency to approach the optimal control frequency. This study takes the suction and oscillatory blowing actuator, which can significantly reduce the gas flow of the high-pressure gas source, as the research object. The characteristics of the start-up, discharge and frequency of the actuator with different geometric shapes are examined by numerical simulation. The results show that only when the throat height after deducting the jet width is larger than 1.2 times of the feedback channel width, the length of the feedback section is sufficient and the expansion angle is appropriate, the jet will oscillate stably and be tangent to the wall of the expansion section. The truncated expansion section can increase the velocity of the jet center at the exit by 67.3% maximally, and reducing the aspect ratio of the separated vortex in the expansion section can maximally increase the jet sweep angle up to ± 110°. Changes in the width and length of the feedback channel will alter the flow rate by changing the flow area and the losses along the channel, thus affecting the frequency.
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    Further research on fatigue statistics intelligence
    XU Jiajin, GAO Zhentong
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (8): 225138-225138.   DOI: 10.7527/S1000-6893.2021.25138
    Abstract241)   HTML1)    PDF(pc) (3940KB)(75)       Save
    "Gao Zhentong Method in Intelligence of Statistics in Fatigue"[1] is only the beginning of the intelligent research of fatigue statistics, so it is necessary to do further research on it. One of the important questions is, what standard is used to judge whether the sample data belongs to the Gaussian distribution or the Weibull distribution? If it belongs to the Weibull distribution, it is still possible to get three different parameters due to different algorithms. There is also the question of which Weibull distribution is more suitable. It is specially proposed to use the correlation coefficient and the size of the determination coefficient as a judgment standard, and at the same time, the corresponding intelligent solution is given. The confidence interval of the three-parameter Weibull distribution is also studied. For practical applications, people are most concerned about the confidence interval of the fatigue life under a given confidence and reliability, and an intelligent solution based on the Gao Zhentong method is given.
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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
    Abstract10256)      PDF(pc) (4047KB)(12594)       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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    Fusion application of DT and AI for aviation intelligent manufacturing
    SUI Shaochun, XU Aiming, LI Xiaohua, LIU Shuntao, HUANG Wei
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2020, 41 (7): 624173-624173.   DOI: 10.7527/S1000-6893.2020.24173
    Abstract1382)      PDF(pc) (9219KB)(984)       Save
    Aiming at the problems of multi-dimensional and multi-scale manufacturing process management and control, high complexity of manufacturing resources composition, and difficulty in tracking and locating quality problems in complex manufacturing scenarios of aviation equipment, combined with the technical characteristics of Digital Twin (DT) and Artificial Intelligence (AI), the research on the fusion application of DT and AI for aviation intelligent manufacturing is carried out. Based on the application status of digital twin and artificial intelligence, this paper systematically expounded the fusion mechanism of digital twin and artificial intelligence, analyzed the key technologies that support the fusion of digital twin and artificial intelligence to drive the aviation intelligent manufacturing and the key issues involved in the construction of AI control center driven by the fusion of digital twin and artificial intelligence. On this basis, the application scenarios such as adaptive control of manufacturing process, intelligent control of production process in intelligent workshop, resource scheduling and optimization decision-making in manufacturing process, and product intelligent quality control are discussed, which could provide reference for the fusion of digital twin and artificial intelligence in aviation intelligent manufacturing.
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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
    Abstract4245)      PDF(pc) (4740KB)(2241)       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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    Development of flow-induced acoustic resonance in aeroengine compressors
    HONG Zhiliang, ZHAO Guochang, YANG Mingsui, SUN Xiaofeng
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2019, 40 (11): 23139-023139.   DOI: 10.7527/S1000-6893.2019.23139
    Abstract1480)      PDF(pc) (5567KB)(767)       Save
    Flow-induced acoustic resonance, a complex coupling phenomenon between the flow and sound fields, can cause high-intense tone noise over 160 dB, which can not only severely discomfort the cabins, but also lead to acoustic fatigue issues to the nearby structures. This problem has attracted the attention of more and more designers for a variety of engineering applications, such as rocket combustors, weapon bay for military applications, sunroof of cars, and tube bank of heat exchangers. Meanwhile, enough cases have suggested that acoustic resonance can also be detected in aeroengine compressors as a potential reason for the failure of aeroengine compressor blades, making it a growing research hotspot. However, the underlying mechanism of acoustic resonance is still an open issue. A comprehensive review on the present research in theoretical and experimental studies, predict and control methods of acoustic resonance is summarized to deepen the basic understanding of flow-induced blade failures, as well as to improve the design and troubleshooting abilities of aeroengine compressors.
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    Low altitude UAV traffic management:An introductory overview and proposal
    QUAN Quan, LI Gang, BAI Yiqin, FU Rao, LI Mengxin, KE Chenxu, CAI Kaiyuan
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2020, 41 (1): 23238-023238.   DOI: 10.7527/S1000-6893.2019.23238
    Abstract2911)      PDF(pc) (7884KB)(1358)       Save
    A large number of disorderly low-altitude UAVs may bring harm to ground facilities, public safety, piloted aerial vehicles/manned aerial vehicles, and so on. However, current air traffic management for civil aviation is not suitable for millions of UAVs in the future. In response to the challenge, new frameworks for low-altitude UAV air traffic management have been developed by many countries, which is a new thing in recent years. This paper focuses on the traffic management of low-altitude UAVs and overviews the related four aspects:the basic concept and current status quo of air traffic related to low-altitude UAV, the introduction to low-altitude UAV traffic management, the key technology of low-altitude UAV traffic management and the corresponding scientific issues of low-altitude UAV traffic management, hoping to contribute the healthy development of UAV industry.
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    Research on injury and brace position for front-row occupant under horizontal impact
    XIE Jiang, MA Shicheng, HE Yonglong, YANG Yongpan, FENG Zhenyu, WANG Yafeng, YANG Huan
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2020, 41 (5): 223489-223489.   DOI: 10.7527/S1000-6893.2019.23489
    Abstract1030)      PDF(pc) (12482KB)(346)       Save
    The objective of this study is to investigate the effects of different parameters and different brace positions on front-row occupant's injury. First of all, the horizontal 16g dynamic impact tests are conducted, and the corresponding multibody models are developed and validated based on the test data. Then parametric studies are conducted to investigate the effects of seat setback distances, stiffness of bulkhead and seatbelt, and seatbelt anchorage locations on occupant's injury. In addition, this study evaluates the effects of different brace positions on prevention of front-row occupant. Results show that the seat setback distances and stiffness of bulkhead had significant influences on the head injury of occupants. The injury of head, neck, femur, and tibia are not sensitive to the seatbelt material properties and seatbelt anchorage locations. The hand-hold-feet and hand-touch-bulkhead brace positions have good protection on head injury of front-row occupants. The hand-hold-feet brace position with head-forward could limit the injury of head, neck, femur, and tibia for front-row occupant within the limited value under emergency landing.
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    Quantum computing and its application prospect in aerodynamics
    LU Fengshun, CHEN Bo, JIANG Xiong
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2020, 41 (4): 23508-023508.   DOI: 10.7527/S1000-6893.2019.23508
    Abstract1761)      PDF(pc) (4856KB)(763)       Save
    Quantum computing is one of the most important post Moore’s Law computing technologies. It can harness the unparalleled computing capacity of the quantum computers, compared with classic computers. Quantum computing will bring a disruptive impact on various industries in the future. With respect to the opportunities and challenges brought by quantum computing to aerodynamics, we first present a detailed survey on the research progress of quantum computers, quantum algorithms, and quantum infrastructure software stack. Then, we select the most commonly used basic methods in the field of aerodynamics and present the recent advances in quantum equations in solving linear equations, interpolation operations, numerical integration, and search optimization. Next, the application prospects of quantum computing in the field of aerodynamics are systematically analyzed. Finally, we point out the research direction that needs to be focused on, including the quantum algorithm relevant to aerodynamics and the quantum software environment that should be built.
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    Research progress of abrasive water jet blanking technology for aero-engine integral blade
    GAO Hang, YUAN Yemin, CHEN Jianfeng, WANG Xuanping
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2020, 41 (2): 623319-623319.   DOI: 10.7527/S1000-6893.2019.23319
    Abstract56)      PDF(pc) (14131KB)(10)       Save
    Integral blade is an important development direction of aeroengine technology. However, the current integral blade is made of difficult-to-machine materials. How to achieve high quality and high efficiency machining of integral blade is one of the most urgent problems in the field of mechanical manufacturing. Roughening of integral blade blanking by Abrasive Water Jet (AWJ) technology is an effective means to improve the processing efficiency of integral blade and reduce the cost of expensive milling tools. In this paper, the domestic and foreign studies of the material removal mechanism of AWJ machining, the trajectory optimization of complex surface, the combination optimization of multi-physical and mechanical parameters, and the intergral blade blanking equipment are summarized. On this basis, the solutions to some key problems of the intergral blade blanking with complex surface structure are put forward. The development trend of AWJ in high efficiency machining of complex curved surface parts is pointed out. The application and feasibility of AWJ in high efficiency machining of complex curved surface parts are prospected.
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    Similarity for simulating automatic carrier landing process of full-scale aircraft with scaled-model
    ZUO Xianshuai, WANG Lixin, LIU Hailiang, WANG Yun, ZHANG Yu
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2019, 40 (12): 123005-123005.   DOI: 10.7527/S1000-6893.2019.23005
    Abstract1621)      PDF(pc) (8035KB)(800)       Save
    Considering the high risk of automatic carrier landing test, a scheme to simulate the automatic carrier landing process of a full-size aircraft with its scaled-model is proposed. To realize this scheme, the similarity relations of automatic landing processes between full-size aircraft and scaled-model are deduced based on the similarity theory, including the similarity relations of automatic landing control law parameters, the similarity of carrier motion parameters, and the similarity of aircraft-carrier relative motion parameters. At last, applying the mathematical simulation models of a carrier-based early warning airplane and its scaled-model, their automatic landing processes are calculated, and the results show high similarity between their automatic landing processes in accordance with the analysis, proving that the similarities deduced in this paper are correct.
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    Professor Naixing Chen's main academic achievements and significant contributions to the development of science and technology: In memory of professor Naixing Chen's one-year anniversary
    WANG Baoguo, HUANG Weiguang, XU Yanji
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2019, 40 (10): 23355-023355.   DOI: 10.7527/S1000-6893.2019.23355
    Abstract1531)      PDF(pc) (4057KB)(277)       Save
    August 6, 2019 is one-year anniversary in memory of Professor Naixing Chen, one of the renowned engineering thermophysicists in China. This article consists of six parts, elaborating Professor Chen's main academic achievements and major contributions to the scientific development in China. He devoted all his life to the engineering thermophysics field of his country, and his spirit in terms of the pursuit of excellence will always be an inspiration for us to forge ahead.
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    Development status and trend of thermal protection structure for return capsules and space probes
    XIE Weihua, HAN Guokai, MENG Songhe, YANG Qiang, JIN Hua
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2019, 40 (8): 22792-022792.   DOI: 10.7527/S1000-6893.2019.22792
    Abstract1736)      PDF(pc) (11321KB)(696)       Save
    In view of the demand of thermal protection system for China space transportation system and deep space exploration, domestic and international studies on development and status of thermal protection materials and structures for return capsules and space probes are reviewed, focusing on the design idea and the performance characteristics of representative materials and structures including honeycomb reinforced thermal protection materials, fiber reinforced thermal protection materials, combined thermal protection structures, and deployable thermal protection structures. On this basis, the development tendency and obstacles of the materials and structures are analyzed, showing that fiber reinforced thermal protection materials have predominance in structural weight and the seam design is the important obstacle to the corresponding structure development. Moreover, on the basis of existing materials, the combined thermal protection structure design is becoming an effective method for improving the efficiency of thermal protection structure. The deployable thermal protection structures are expected to significantly enhance the payload of spacecraft; however, the flexible thermal protection materials still need to be developed. Generally, more frequent space transportation and development of deep space exploration will play an important role in promoting the development of thermal protection structures.
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    Research status and future development of grinding technology of titanium materials for aero-engines
    DING Wenfeng, XI Xinxin, ZHAN Jinghua, XU Jiuhua, FU Yucan, SU Honghua
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2019, 40 (6): 22763-022763.   DOI: 10.7527/S1000-6893.2019.22763
    Abstract1517)      PDF(pc) (28214KB)(682)       Save
    Titanium materials, including titanium alloys, titanium alumina intermetallics, and titanium matrix composites, have broad applications in aero-engine industry for their outstanding properties such as low density, high strength, excellent oxidation, and creep resistance. However, titanium materials are the typical difficult-to-machine materials. Grinding is an important method for high-efficiency and precision machining of titanium materials, which could produce good machining accuracy and surface quality. This paper firstly outlines the application statues of titanium materials in aero-engines and the development of its grinding operation. Then, the research advances on grinding technology of titanium materials are reviewed from the aspects of grinding force and temperature, abrasive tool wear, material removal rates, and surface integrity, followed by a summary of new methods and technologies proposed for solving some critical problems in grinding titanium materials. Finally, the prospect of future research on grinding of these titanium materials is proposed.
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