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    Numerical simulation of laser additive manufacturing process: A review
    GUO Xinxin, CHEN Zhehan
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2021, 42 (10): 524227-524227.   DOI: 10.7527/S1000-6893.2020.24227
    Abstract1605)   HTML48)    PDF(pc) (6700KB)(3419)       Save
    Numerical simulation is an important means to study various physical phenomena in the process of laser additive manufacturing, reveal the formation mechanism of part defects, and optimize the process parameters. Extensive research has been conducted in the analysis of thermal processes, metal powder particle properties, microstructure, quality defect causes, and many other aspects, and corresponding mathematical models and methods have been proposed. The numerical simulation of laser additive manufacturing process is a complex problem spanning multiple scales in both space and time. The objects and methods used in numerical simulation in micro, meso and macro scales are different. Most existing research focuses on process simulation at a certain scale, and other research usually establishes the coupling relationship among models based on their data relationship to achieve a comprehensive thermal-phase or thermal-mechanical analysis. This paper reviews current main technologies in the field of numerical simulation of laser additive manufacturing. Based on the basic process of numerical simulation, the involved heat source model, powder model, mechanical model and microstructure model are introduced, and their characteristics and applicability discussed. Considering the development of related technical fields, the direction of research on numerical simulation technology of laser additive manufacturing is discussed, hoping to provide reference for the technical development in this field.
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    Thermal flutter ground simulation test
    Haoyu CHEN, Binwen WANG, Qiaozhi SONG, Xiaodong LI
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2023, 44 (8): 227295-227295.   DOI: 10.7527/S1000-6893.2022.27295
    Abstract410)   HTML58)    PDF(pc) (4290KB)(1960)       Save

    Ground flutter simulation test is a flutter verification experiment technology for real aircraft structures, which uses exciters to simulate unsteady aerodynamic force. In this paper, the thermal environment simulation scheme is used in this technology to establish the thermal flutter ground simulation system. An aerodynamic interpolation point optimization algorithm is proposed based on the weighting of modal shapes. An unsteady aerodynamic reduced-order model for time-varying structure is constructed by using the Kriging surrogate model. After the simulation scheme of aerodynamic thermal environment and the measurement method of high-temperature structure’s response signal are designed, the experiment system based on the titanium alloy wing model is completed. Finally, time-varying thermal flutter boundary tracking and testing is carried out. The testing results show that the testing accuracy is acceptable when the controller is within the preset frequency range, but the narrow control bandwidth of robust controller limits the application of the thermal flutter ground simulation test.

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    Broadband noise reduction inside helicopter cockpit with acoustic black hole effect
    WANG Xiaodong, QIN Yifan, JI Hongli, LU Yang, QIU Jinhao
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2020, 41 (10): 223831-223831.   DOI: 10.7527/S1000-6893.2020.23831
    Abstract1423)   HTML23)    PDF(pc) (9441KB)(1716)       Save
    Acoustic Black Hole (ABH) effect allows alteration of the phase velocity and group velocity of wave propagation in a structure by changing the impedance to concentrate the waves in local areas of the structure and dissipate energy with a little damping. With the advantages of high efficiency, light weight, and wide frequency, the ABH provides a new perspective for structural vibration and noise control, exhibiting strong potential and application prospects. To reduce the broadband noise inside helicopter cockpits, this paper presents two kinds of structural design schemes based on the ABH effect after considering noise sources and transmission paths. The coupling model of the helicopter cockpit is established using the finite element software. The vibro-acoustic characteristics are then analyzed, and the mechanism of the ABH induced cabin noise reduction is explained. The effect test and performance evaluation are carried out on the established experimental platform. Results show that the embedded ABH structure can effectively reduce the medium-high frequency noise inside the cockpit, while its insufficient performance on low frequency noise is compensated by the additional ABH structure, therefore widening the effective frequency band. The average noise level can be reduced by 3-10 dB in the one-third octave band after employing both the embedded ABH and the additional one. Moreover, the total mass is slightly decreased compared with the traditional structure. This research contributes to the application of ABH new technology to vibration and noise reduction of helicopter engineering in the future.
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    Kriging surrogate model and its application to design optimization: A review of recent progress
    HAN Zhonghua
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2016, 37 (11): 3197-3225.   DOI: 10.7527/S1000-6893.2016.0083
    Abstract11276)      PDF(pc) (9181KB)(6642)       Save

    Over the past two decades, surrogate modeling has received much attention from the researchers in the area of aerospace science and engineering due to its capability of greatly improving the efficiency of design optimization when high-fidelity numerical analysis is employed. Design optimization via surrogate models is intensively researched and eventually leads to a new type of optimization algorithm which is called surrogate-based optimization (SBO). Among the available surrogate models, such as polynomial response surface model, radial-basis functions, artificial neutral network, support-vector regression, multivariate interpolation or regression, and polynomial chaos expansion, Kriging model is the most representative surrogate model which has great potential in engineering design and optimization. In the context of aircraft design, this paper reviews the theory, algorithm and recent progress for researches on the Kriging surrogate model. First, the fundamental theory and algorithm of Kriging model are briefly reviewed and the experience about how to improve the robustness and efficiency is presented. Second, three major breakthroughs of Kriging model in recent years are reviewed, including gradient-enhanced Kriging, CoKriging and hierarchical Kriging. Third, the optimization mechanism and framework of surrogate-based optimization using Kriging model are discussed. In the meanwhile, the concept of infill-sampling criterion and sub optimization is presented. Five infill-sampling criteria as well as the dedicated constraint handling methods are described. Furthermore, the newly developed local EI (expected improvement) method and termination criteria for SBO are introduced. Fourth, a number of test cases including benchmark optimization problems as well as aerodynamic and multidisciplinary design optimization problems are given to demonstrate the excellent performance and great potential of the surrogate-based optimization using Kriging model. At last, the key challenges as well as future directions about the theory, algorithm and applications are discussed.

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    Effect of brazing temperature on microstructure and mechanical property of C/C/AgCuTi+Cf/TC4 joint
    ZHAO Kehan, LIU Duo, ZHU Haitao, CHEN Bin, HU Shengpeng, SONG Xiaoguo
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (4): 525007-525007.   DOI: 10.7527/S1000-6893.2021.25007
    Abstract576)   HTML4)    PDF(pc) (1521KB)(1408)       Save
    C/C composite and TC4 alloy were brazed successfully by using AgCuTi+0.3%Cf filler. The interfacial microstructure was investigated by the SEM, EDS and TEM. The mechanical property of the joints was characterized by the universal testing machine. The microstructure and mechanical property of the joints brazed at different temperatures were analyzed. The process of joint formation was analyzed, and the role of carbon fiber in each stage of joint formation was revealed. Results show that with the increase of the brazing temperature, Ti activity and element diffusion rate increased, so that the thickness of reaction layers on both sides of joints and Ti-Cu compounds in the center of brazing seam increased. The shear strength of joints first increased and then decreased with the increase of brazing temperature, and the maximum strength of 28.5 MPa was obtained when the brazing temperature was 900℃ and the holding time was 10 min. The formation process of C/C/AgCuTi+Cf/TC4 joints could be divided into four stages:melting of filler, and dissolving of TC4 alloy; element enrichment, and formation of reaction layer; isothermal precipitation, and movement of liquid phase; joint formation. Carbon fiber played an important role in the formation of the joint, which regulated the microstructure and residual stress of the brazed joint and improved the mechanical property of brazed joint.
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    Material⁃structure integrated design for high⁃performance aerospace thin⁃walled component
    Weihong ZHANG, Han ZHOU, Shaoying LI, Jihong ZHU, Lu ZHOU
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2023, 44 (9): 627428-627428.   DOI: 10.7527/S1000-6893.2022.27428
    Abstract2083)   HTML147)    PDF(pc) (4778KB)(1355)       Save

    The rapid development of the next generation of aerospace technology has imposed more and more stringent requirements for such structural performance as the ultra-strong load-bearing, extreme heat-proof, ultra-precision and ultra-lightweight. Therefore, how to design and fabricate high-performance, lightweight, and ultra-precise aerospace thin-walled structures has become a common concern in the field of advanced material and structural design and manufacturing. This paper reviews the main achievements of high-performance design and manufacture of thin-walled components and their aerospace applications in recent years, focusing on the scientific issues including the mapping law between multi-scale structures and structural performance, the composed manufacturing principle of multi-material and multi-scale structures, and the interaction mechanism between material organization evolution and structural deformation. Moreover, the manufacturing process constraints in structural optimization, the influence of additive manufacturing process parameters on the structural optimization, the material-structure integrated design method of high-performance structures and its application in aerospace structures are discussed. The development prospects and applications of the material-structure integrated design and manufacturing methods of typical aerospace thin-walled structures in the future are also prospected, which can provide references for future related research and aerospace applications.

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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
    Abstract2896)      PDF(pc) (4041KB)(3291)       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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    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
    Abstract3012)   HTML510)    PDF(pc) (26942KB)(2274)       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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    Development needs and difficulty analysis for smart morphing aircraft
    Xuhui ZHANG, Chunlei XIE, Sijia LIU, Ming YAN, Siyuan XING
    Acta Aeronautica et Astronautica Sinica    2023, 44 (21): 529302-529302.   DOI: 10.7527/S1000-6893.2023.29302
    Abstract671)   HTML92)    PDF(pc) (11391KB)(1035)       Save

    With the development and application of artificial intelligent technologies in the military field, future intelligent warfare is to demonstrate the following traits: more complex cognition and decision making, more rapid changes and evolution, and access and denial in the whole warfare. The next-generation flight vehicles will be flight-demand oriented, artificial-intelligence centered, and changing flexible. Smart morphing aircraft, obviously characterized by intelligent technology and deformation technology, can have dual advantages of fast algorithm upgrades and extremely flexible hardware. It introduces new flight modes and combat capabilities, and will therefore become an important trend. However, smart morphing aircraft design requires complicated technologies. The costs of deformation, such as the increased complexity of the machine system, pose challenges to aerodynamic design, flight control, and structural implementation. The challenges include the full-profile optimization, structural application, and performance prediction and validation in the deformation process, where the core problem is to achieve the optimal design in each shape in the context of multidisciplinary engineering.

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    SST turbulence model improvements: Review
    Yu ZENG, Hongbo WANG, Mingbo SUN, Chao WANG, Xu LIU
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2023, 44 (9): 27411-027411.   DOI: 10.7527/S1000-6893.2022.27411
    Abstract2125)   HTML108)    PDF(pc) (3131KB)(1098)       Save

    The k-ω Shear Stress Transport (SST) turbulence model, one of the best eddy viscosity models with comprehensive performance, has been widely used in recent years. However, with the increase of problem complexity and simulation accuracy requirements, the standard SST turbulence model shows clear limitations in certain aspects, eliciting extensive improvement research. This paper reviews the improvement research of the SST model from six aspects: rotation/curvature effect, compressibility effect, shock wave unsteadiness effect, effect of anisotropy Reynolds stress, effect of stress-strain deviation, and laminar/turbulent transition effect. Meanwhile, it also briefly introduces the model improvement based on the data-driven technology in recent years, sorts out the ideas and development trends of various improvement research, expounds their applicability and limitations, and analyzes the reasons and problems affecting the improvement effect. Finally, some suggestions for future work are 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
    Abstract12001)      PDF(pc) (4047KB)(14791)       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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    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
    Abstract2832)   HTML213)    PDF(pc) (29169KB)(1677)       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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    3D printed continuous fiber-reinforced composites: State of the art and perspectives
    CHEN Xiangming, YAO Liaojun, GUO Licheng, SUN Yi
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2021, 42 (10): 524787-524787.   DOI: 10.7527/S1000-6893.2020.24787
    Abstract3191)   HTML194)    PDF(pc) (15830KB)(1941)       Save
    Three-Dimensional(3D) printing, also termed as Additive Manufacturing (AM), has experienced significant development in the last several years. This advanced technology has the potential to promote new revolution in high-end equipment manufacturing, and has been widely used in aerospace, marine, electronic and biomedical engineering. Fiber reinforced composites can offer significant advantages over metals, for their excellent mechanical properties, weight saving potential, good resistance to corrosion and fatigue, design tailorability, etc. AM of fiber-reinforced composites can promote AM into a robust manufacturing paradigm and make great possibility for customization, automatic fabrication and flexibility in designing high performance components with complicated geometries at relatively low cost and time. 3D printed continuous fiber-reinforced composites therefore have got great attention in the last several years. This paper provides a critical review on the mechanical properties and performance of 3D printed continuous fiber-reinforced composites. Specifically, a thorough discussion on the effects of printing process parameters on the performance of 3D printed composites has been carefully provided in the first part of this paper. The mechanical properties and damage mechanisms of 3D printed composites under various loading conditions are subsequently discussed and summarized. The corresponding models and methods for stiffness and strength prediction of 3D printed composites are introduced in the third part. Future research directions and desirable objectives are also discussed.
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    Progress and application of key technologies of SensorCraft
    Shuai HAO, Tielin MA, Yi WANG, Jinwu XIANG, Hongzhong MA, Baifeng JIANG, Jun CAO
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2023, 44 (6): 27034-027034.   DOI: 10.7527/S1000-6893.2022.27034
    Abstract1190)   HTML99)    PDF(pc) (12633KB)(941)       Save

    SensorCraft is an early warning and surveillance and information synthesis aircraft proposed by the Air Force Research Laboratory, with high ceiling and long endurance. It adopts the platform-payload integration technology, with the dual features of the aircraft and sensor. Coupling of multiple elements between platform and payload means that the overall layout design is different from that of the traditional Intelligence, Surveillance and Reconnaissance (ISR) vehicle. Flight conditions and performance indexes bring new challenges to the aerodynamic design. Aeroelastic problem of large aspect ratio flexible wing not only worsens flight performance, but also leads to loss of electromagnetic performance of wing conformal antenna. This paper summarizes the technical characteristics of SensorCraft, expounds the development history of the United States SensorCraft system from two aspects of the flight platform and conformal antenna. From the perspective of technical characteristics, key technologies supporting SensorCraft are sorted out, such as integrated layout design, laminar drag reduction, gust alleviation, conformal antenna design, deformation measurement & reconstruction, and electromagnetic performance compensation. Relevant applications are introduced. The development trend of this aircraft is also discussed in terms of the flight ability, stealth ability, perception ability and coordination ability of the aircraft, so as to provide reference for the new ISR aircraft.

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    Research progress and engineering application of flow control technology for drag and heat reduction of high-speed vehicles
    Guangsheng ZHU, Shiyong YAO, Yi DUAN
    Acta Aeronautica et Astronautica Sinica    2023, 44 (15): 529049-529049.   DOI: 10.7527/S1000-6893.2023.29049
    Abstract659)   HTML98)    PDF(pc) (4577KB)(791)       Save

    Drag and heat reductions are two core issues in the design of high-speed flight vehicles. Drag reduction can enhance the lift-drag ratio of vehicles and decrease the fuel consumption, while heat reduction can reduce the weight of thermal protection system and promote the effective load of flight vehicles. Drag and heat reductions are the key technologies to improve the fine design and enhance the flight performance. This paper mainly reviews the research status of flow control technology for drag and heat reductions of shock wave and boundary layer, from the perspective of the engineering requirements for drag and heat reductions of high-speed flight vehicles. This paper also points out the existing problems in engineering application and the direction that should be paid close attention to in the future, to realize the engineering application of active flow control of flight vehicles and improve the flight performance.

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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
    Abstract3535)      PDF(pc) (7884KB)(2198)       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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    Intelligent air combat decision making and simulation based on deep reinforcement learning
    Pan ZHOU, Jiangtao HUANG, Sheng ZHANG, Gang LIU, Bowen SHU, Jigang TANG
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2023, 44 (4): 126731-126731.   DOI: 10.7527/S1000-6893.2022.26731
    Abstract1580)   HTML120)    PDF(pc) (4846KB)(1057)       Save

    Intelligent decision-making for aircraft air combat is a research hotspot of military powers in the world today. To solve the problem of Unmanned Aerial Vehicle (UAV) maneuvering decision-making in the close-range air combat game, an autonomous decision-making model based on deep reinforcement learning is proposed, where a reward function comprehensively considering the attack angle advantage, speed advantage, altitude advantage and distance advantage is adopted and improved. The improved reward function avoids the problem that the agent is induced to fall to the ground by the enemy aircraft, and can effectively guide the agent to converge to the optimal solution. Aiming at the problem of slow convergence caused by random sampling in reinforcement learning, we design a value-based prioritization method for experience pool samples. Under the premise of ensuring the algorithm convergence, the convergence speed of the algorithm is significantly accelerated. The decision-making model is verified based on the human-machine confrontation simulation platform, and the results show that the model can suppress the expert system and the driver in the process of close air combat.

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    State of the art and perspectives of autonomous navigation technology
    WANG Wei, XING Chaoyang, FENG Wenshuai
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2021, 42 (11): 525049-525049.   DOI: 10.7527/S1000-6893.2021.25049
    Abstract4456)   HTML294)    PDF(pc) (11105KB)(1501)       Save
    The autonomous navigation technology is essential for the automated and intelligent operation of various motion carriers. This article briefly introduces the basic concepts of autonomous navigation technology, and illustrates the research progress of the technology in the fields of aerospace, aviation, ships, vehicles, and individual soldiers at home and abroad. The key technologies for autonomous navigation such as inertial navigation, inertial-based integrated navigation, geomagnetic navigation, gravity gradient navigation, celestial navigation and multi-source information fusion are analyzed. Then, the development trend of the technology is discussed, which can provide reference for the development of various mainstream autonomous navigation systems in China and assistance for the overall design of a variety of autonomous navigation tasks in the future.
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    Critical review on tube joining by plastic deformation
    LIU Xin, YANG Jingchao, LI Heng, ZHANG Yanhong, YANG Zhiwei, GU Jingfei, LI Guangjun, HUANG Dan
    ACTA AERONAUTICAET ASTRONAUTICA SINICA    2022, 43 (4): 525258-525258.   DOI: 10.7527/S1000-6893.2021.25258
    Abstract587)   HTML19)    PDF(pc) (1923KB)(1133)       Save
    Being the key components that play the role of "blood vessel" life control lines, tubular fittings are widely used in fluids transmission components and structural parts of various advanced equipment such as aerospace, automobile and other fields. Generally, the working environment of tubular fittings is the most complex, and the reliability requirement is the most demanding in the whole equipment. The reliable connection of all kinds of pipe members is the bottleneck problem to ensure the safety and stability of service. Tube joining by plastic deformation technology has the advantages of high connection strength, high reliability, high efficiency and environmental protection during the connection process, and has been widely used in various pipeline connection processes. However, with the further improvement of all kinds of advanced equipment for long life, high efficiency, lightweight and high reliability requirements, tube joining technology is facing new challenges. In this paper, the latest research progress of tube joining by plastic deformation technology is reviewed from the aspects of plastic forming, assembly connection and service performance. Based on the analysis of the above research, the development trend and technical challenges of tube joining by plastic deformation technology are summarized.
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    Acta Aeronautica et Astronautica Sinica    2023, 44 (21): 0-.  
    Abstract237)      PDF(pc) (25925KB)(686)       Save
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