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| 1 | Distributed cooperative guidance for multiple missiles with fixed and switching communication topologies显示文摘This study investigates cooperative guidance problems for multiple missiles with fixed and switching directed communication topologies. A two-step guidance strategy is proposed to realize the simultaneous attack. In the first step, a distributed cooperative guidance law is designed using local neighboring information for multiple missiles to achieve consensus on range-to-go and leading angle. The second step begins when the consensus of multiple missiles is realized. During the second step, multiple missiles disconnect from each other and hit the target using the proportional navigation guidance law. First, based on the local neighboring communications, a sufficient condition for multiple missiles to realize simultaneous attack with a fixed communication topology is presented, where the topology is only required to have a directed spanning tree. Then,the results are extended to the case of switching communication topologies. Finally, numerical simulations are provided to validate the theoretical results. | Qilun ZHAO Xiwang DONG Zixuan LIANG Chen BAI Jian CHEN Zhang REN | 2017 | Chinese Journal of Aeronautics2017，30，4： | 27 |
| 2 | Cooperative guidance strategy for multiple hypersonic gliding vehicles system显示文摘Cooperative guidance strategy for multiple hypersonic gliding vehicles system with flight constraints and cooperative constraints is investigated.This paper mainly cares about the coordination of the entry glide flight phase and driving-down phase.Different from the existing results,both the attack time and the attack angle constraints are considered simultaneously.Firstly, for the entry glide flight phase, a two-stage method is proposed to achieve the rapid cooperative trajectories planning, where the control signal corridors are designed based on the quasi-equilibrium gliding conditions.In the first stage, the bank angle curve is optimized to achieve the attack angle coordination.In the second stage, the angle of attack curve is optimized to achieve the attack time coordination.The optimized parameters can be obtained by the secant method.Secondly, for the driving-down phase, the cooperative terminal guidance law is designed where the terminal attack time and attack angle are considered.The guidance law is then transformed into the bank angle and angle of attack commands.The cooperative guidance strategy is summarized as an algorithm.Finally, a numerical simulation example with three hypersonic gliding vehicles is provided for revealing the effectiveness of the acquired strategy and algorithm. | Jianglong YU Xiwang DONG Qingdong LI Zhang REN Jinhu LV | 2020 | Chinese Journal of Aeronautics2020，33，3： | 14 |
| 3 | Development and Analysis of an Electrically Actuated Lower Extremity Assistive Exoskeleton显示文摘一架电子上激活的更低的极限皮骨骼被开发,在哪个当有弹性的元素连接的另外的关节消极地被激活时,仅仅膝关节活跃地被激活。这份报纸描述批评设计标准并且介绍设计的进程和使活动系统的计算。一台灵活物理 Human-Robot-Interaction (pHRI ) 测量设备被设计并且适用检测人的运动,它包括纳入连接手铐的内部表面的二个力量传感器和二个气囊。联机适应 pHRI 最小化控制策略被建议并且实现了驱使机器的皮骨骼系统跟随人的手足的运动轨道。测量 pHRI 信息被变化加权的一般水准(VWA ) 方法熔化。pHRI 和控制转矩的吝啬的方形的价值(MSV ) 被利用评估皮骨骼的表演。改进舒适水平和还原剂精力消费,当控制法律被设计时,严肃赔偿被考虑。最后,实际实验在健康用户上被执行。试验性的结果证明建议系统能帮助人走,构画出的控制策略有效、有效。 | Yi Long Zhijiang Du Chaofeng Chen Weidong Wang Long He Xiwang Mao Guoqiang Xu Guangyu Zhao Xiaoqi Li Wei Dong | 2017 | Journal of Bionic Engineering2017，14，2： | 7 |
| 4 | Three-dimensional cooperative guidance strategy and guidance law for intercepting highly maneuvering target显示文摘Cooperative interception of the target with strong maneuverability by multiple missiles with weak maneuverability in the three-dimensional nonlinear model is studied.Firstly,the three-dimensional nonlinear model of cooperative guidance is established.The three-dimensional reachable region is represented composed of lateral acceleration and longitudinal acceleration in the two-dimensional coordinate system.Secondly,the problem of the multiple missile’s reachable coverage area is transformed into the problem of cooperative coverage.A cooperative coverage strategy is proposed and an algorithm for quickly calculating the number of required missiles is designed.Then,the guidance law based on the cooperative coverage strategy is proposed,and it is proved that cooperative interception of the target can be achieved under the acceleration limit.Moreover,the relations among the number of missiles,the initial array position of terminal guidance and the coverage area of the target’s large maneuver are analyzed.The dynamic adjustment strategy of guidance parameters is proposed to reduce the guidance error.Finally,simulation results show that multiple missiles with low maneuverability can achieve effective interception of target with strong maneuverability through the proposed cooperative strategy and cooperative guidance method. | Ziyan CHEN Jianglong YU Xiwang DONG Zhang REN | 2021 | Chinese Journal of Aeronautics2021，34，5： | 7 |
| 5 | Formation tracking control for time-delayed multi-agent systems with second-order dynamics显示文摘In this paper, formation tracking control problems for second-order multi-agent systems(MASs) with time-varying delays are studied, specifically those where the position and velocity of followers are designed to form a time-varying formation while tracking those of the leader. A neighboring relative state information based formation tracking protocol with an unknown gain matrix and time-varying delays is presented. The formation tracking problems are then transformed into asymptotically stable problems. Based on the Lyapunov-Krasovskii functional approach, conditions sufficient for second-order MASs with time-varying delays to realize formation tracking are examined. An approach to obtain the unknown gain matrix is given and, since neighboring relative velocity information is difficult to measure in practical applications, a formation tracking protocol with time-varying delays using only neighboring relative position information is introduced. The proposed results can be used on target enclosing problems for MASs with second-order dynamics and time-varying delays. An application for target enclosing by multiple unmanned aerial vehicles(UAVs) is given to demonstrate the feasibility of theoretical results. | Han Liang Dong Xiwang Li Qingdong Ren Zhang | 2017 | Chinese Journal of Aeronautics2017，30，1： | 6 |
| 6 | Cooperative differential games guidance laws for multiple attackers against an active defense target显示文摘This paper is concerned with a scenario of multiple attackers trying to intercept a target with active defense.Three types of agents are considered in the guidance:The multiple attackers,the target and the defender,where the attackers aim to pursuit the target from different directions and evade from the defender simultaneously.The guidance engagement is formulated in the framework of a zero-sum two-person differential game between the two opposing teams,such that the measurements on the maneuver of the target or estimations on the defending strategy of the defender can be absent.Cooperation of the attackers resides in two aspects:redundant interception under the threat of the defender and the relative intercept geometry with the target.The miss distances,the relative intercept angle errors and the costs of the agents are combined into a single performance index of the game.Such formulation enables a unitary approach to the design of guidance laws for the agents.To minimize the control efforts and miss distances for the attackers,an optimization method is proposed to find the best anticipated miss distances to the defender under the constraint that the defender is endowed with a capture radius.Numerical simulations with two cases are conducted to illustrate the effectiveness of the proposed cooperative guidance law. | Fei LIU Xiwang DONG Qingdong LI Zhang REN | 2022 | Chinese Journal of Aeronautics2022，35，5： | 5 |
| 7 | UIF-based cooperative tracking method for multi-agent systems with sensor faults显示文摘For maneuvering target tracking with sensor faults, consensus-based distributed state estimation problems are studied herein. The communication status of the nonlinear system composed of multiple agents is described using the graph theory. Considering the impacts caused by sensor failures on measurement equations, a weighted average consensus-based unscented information filter(UIF) algorithm is proposed to improve tracking accuracy. Moreover, the estimation error for the investigated nonlinear system has been analyzed based on the stochastic boundedness theory to evaluate the proposed algorithm's performance and feasibility. Finally, simulation results are presented to assert the validity of the method. | Yingrong YU Siting PENG Xiwang DONG Qingdong LI Zhang REN | 2019 | Science China(Information Sciences)2019，62，1： | 3 |
| 8 | Distributed time-varying formation control with uncertainties based on an event-triggered mechanism显示文摘This paper investigates the distributed time-varying formation(TVF)problems for general linear multi-agent systems(MASs)subject to matched bounded uncertainties based on an adaptive event-triggered mechanism.A TVF protocol was designed with an event-triggered mechanism by introducing adaptive weights into the formation control protocol and triggering condition,and the large chattering phenomenon was avoided by theσ-modification adaptive law.According to the Lyapunov stability theory,proof has been established that the MASs in the presence of uncertainties can realize the expected formation that satisfies the given feasible condition.Finally,an example is provided to verify the effectiveness of the proposed algorithm. | Xiaoduo LI Yumeng BAI Xiwang DONG Qingdong LI Zhang REN | 2021 | Science China(Information Sciences)2021，64，3： | 1 |
| 9 | Enantioselective Chlorocyclization of Olefinic Amides with 1,3-Dichloro-5,5-Dimethylhydantoin(DCDMH) Catalyzed by(DHQD)2PHAL显示文摘 | ZHOU Qingjun GUO Chao LI Xiwang HE Pei YANG Guichun DONG Chune | 2018 | Wuhan University Journal of Natural Sciences2018，23，3： | 0 |
| 10 | Microstructure,mechanical properties and fracture behaviors of large-scale sand-cast Mg-3Y-2Gd-1Nd-0.4Zr alloy显示文摘In order to improve the ductility of commercial WE43 alloy and reduce its cost,a Mg-3Y-2Gd-1Nd-0.4Zr alloy with a low amount of rare earths was developed and prepared by sand casting with a differential pressure casting system.Its microstructure,mechanical properties and fracture behaviors in the as-cast,solution-treated and as-aged states were evaluated.It is found that the aged alloy exhibited excellent comprehensive mechanical properties owing to the fine dense plate-shapedβ'precipitates formed on prismatic habits during aging at 200℃for 192 hrs after solution-treated at 500℃for 24 hrs.Its ultimate tensile strength,yield strength,and elongation at ambient temperature reach to 319±10 MPa,202±2 MPa and 8.7±0.3%as well as 230±4 MPa,155±1 MPa and 16.0±0.5%at 250℃.The fracture mode of as-aged alloy was transferred from cleavage at room temperature to quasi-cleavage and ductile fracture at the test temperature 300℃.The properties of large-scale components fabricated using the developed Mg-3Y-2Gd-1Nd-0.4Zr alloy are better than those of commercial WE43 alloy,suggesting that the new developed alloy is a good candidate to fabricate the large complex thin-walled components. | Lixiang Yang Yuanding Huang Zhengquan Hou Lv Xiao Yuling Xu Xiwang Dong Fei Li Gerrit Kurz Baode Sun Zhongquan Li Norbert Hort | 2023 | Journal of Magnesium and Alloys2023，11，8： | 0 |
| 11 | Applications of Magnesium Alloys in Aerospace and Aviation显示文摘Magnesium alloys are well applied in aerospace and aviation because of their mass saving potential,good electromagnetic shielding performance,and high damping capacity. To further promote the applications,in this paper,the applications of magnesium alloys are reviewed,which could provide insights for researchers and application designers. Firstly,the applications in aerospace are reviewed,including missile,satellite,rocket,and spacecraft.Secondly,the applications and commercial magnesium alloys in aviation are summarized. Thirdly,the bottleneck and existing problems for such magnesium alloys applied in aerospace and aviation are discussed. The requirements for the magnesium alloy performance in aerospace and aviation are evaluated and elaborated. | YANG Lixiang HUANG Yuanding HOU Zhengquan XIAO Lü DONG Xiwang LI Shurong LI Fei ZENG Xiaoqin SUN Baode LI Zhongquan | 2022 | 上海航天(中英文)2022，39，1： | 0 |
| 12 | Effect of Semi-solid Isothermal Heat Treatment on Microstructure of VW63Z Alloy显示文摘The effects of isothermal heat treatment on the semi-solid microstructure evolution of VW63Z(Mg-6Gd-3Y-0.4Zr,wt.%)alloy are studied.It shows that the microstructure of VW63Z alloy could transform from equiaxed crystal to semi-solid spherical crystal after isothermal heat treatment above 620℃.With the heating temperature elevating from 620℃ to 635℃ and the holding time prolonging from 10 min to 35 min,the liquid fraction increases gradually.The semi-solid microstructure evolution of VW63Z alloy can be divided into three stages,i.e.,particle coarsening and spheroidization;particle necking,coalescence,and Ostwald ripening;and dynamic equilibrium.The semi-solid process window of VW63Z alloy ranges from 620℃ to 635℃,where the best process parameters are holding at 635℃ for 20 min-30 min.The solid fraction,the average particle size,and the shape factor are 41.1%-53.8%,81.5μm-83.2μm,and 0.70-0.75,respectively.The maximum relative deviations of the solid fraction,the particle size,and the shape factor at different heights of the same billet are 44.6%,17.4%,and 16.6%,respectively,which means that it should pay attention to the uniformity of edge and core of VW63Z alloy during isothermal heat treatment.The driving force of microstructure is supposed to be the reduction of solid-liquid interface free energy. | GONG Zhengxuan PANG Song JI Song DONG Xiwang HOU Xiangwu CHEN Ge HUA Xiru WU Lili JIANG Shanyao XIAO Lü | 2022 | 上海航天(中英文)2022，39，1： | 0 |
| 13 | Linear Shaped Charge Cutting Property and Charge Cutting Mechanism of Mg-Gd-Y-Zn Alloy显示文摘The linear shaped charge cutting technology is an effective technology for aircraft separation.It can separate invalid components from aircrafts timely to achieve light-weight.Magnesium alloy is the lightest metal material,and can be used to cast effective light-weight components of an aircraft construction.However,the application study of the linear shaped charge cutting technology on magnesium alloy components is basically blank.In response to the demand for the linear separation of magnesium alloys,the Mg-12Gd-0.5Y-0.4Zn alloy is selected to carry out the target shaped charge cutting test.The effects of the shaped charge line density,cutting thickness,and mechanical properties on the cutting performance of the alloy are studied.The shaped charge cutting mechanism is analyzed through the notch structure.The results show that the linear shaped charge cutting performance is significantly affected by the penetration and the collapse.The higher the linear density is,the stronger the ability of the linear shaped charge cutter is,and the greater the penetration depth is,which is advantageous.However,the target structure will be damaged when it is too large(e.g.,4.5 g·m^(-1)).Within 12 mm,when the cutting thickness of the target increases,the penetration depth increases.The lower the tensile strength is,the greater the penetration depth is,and the more conducive the penetration depth to the shaped charge cutting is.When the elongation(EL)increases to 12%,the collapse of the target is incomplete and the target cannot be separated.When the tensile strength of the Mg-Gd-Y-Zn alloy is less than 350 MPa,the EL is less than 6.5%,the cutting thickness is less than 12 mm,and the linear shaped charge cutting of the magnesium alloy can be achieved stably. | WANG Yanbo ZHOU Haitao XIAO Lü HOU Xiangwu SUN Xin CHEN Ge DONG Xiwang | 2022 | 上海航天(中英文)2022，39，1： | 0 |
| 14 | A homogenization-planning-tracking method to solve cooperative autonomous motion control for heterogeneous carrier dispatch systems显示文摘Taxiing aircraft and towed aircraft with drawbar are two typical dispatch modes on the flight deck of aircraft carriers. In this paper, a novel hierarchical solution strategy, named as the Homogenization-Planning-Tracking(HPT) method, to solve cooperative autonomous motion control for heterogeneous carrier dispatch systems is developed. In the homogenization layer, any towed aircraft system involved in the sortie task is abstracted into a virtual taxiing aircraft. This layer transforms the heterogeneous systems into a homogeneous configuration. Then in the planning layer, a centralized optimal control problem is formulated for the homogeneous system. Compared with conducting the path planning directly with the original heterogeneous system, the homogenization layer contributes to reduce the dimension and nonlinearity of the formulated optimal control problem in the planning layer and consequently improves the robustness and efficiency of the solution process. Finally, in the tracking layer, a receding horizon controller is developed to track the reference trajectory obtained in the planning layer. To improve the tracking performance,multi-objective optimization techniques are implemented offline in advance to determine optimal weight parameters used in the tracking layer. Simulations demonstrate that smooth and collision-free cooperative trajectory can be generated efficiently in the planning phase. And robust trajectory tracking can be realized in the presence of external disturbances in the tracking phase.The developed HPT method provides a promising solution to the autonomous deck dispatch for unmanned carrier aircraft in the future. | Jie LIU Xianzhou DONG Xinwei WANG Kaikai CUI Xiwang QIE Jun JIA | 2022 | Chinese Journal of Aeronautics2022，35，9： | 0 |
| 15 | Multi-agent differential game based cooperative synchronization control using a data-drivenmethod显示文摘This paper studies the multi-agent differential game based problem and its application to cooperative synchronization control.A systematized formulation and analysis method for the multi-agent differential game is proposed and a data-driven methodology based on the reinforcement learning(RL)technique is given.First,it is pointed out that typical distributed controllers may not necessarily lead to global Nash equilibrium of the differential game in general cases because of the coupling of networked interactions.Second,to this end,an alternative local Nash solution is derived by defining the best response concept,while the problem is decomposed into local differential games.An off-policy RL algorithm using neighboring interactive data is constructed to update the controller without requiring a system model,while the stability and robustness properties are proved.Third,to further tackle the dilemma,another differential game configuration is investigated based on modified coupling index functions.The distributed solution can achieve global Nash equilibrium in contrast to the previous case while guaranteeing the stability.An equivalent parallel RL method is constructed corresponding to this Nash solution.Finally,the effectiveness of the learning process and the stability of synchronization control are illustrated in simulation results. | Yu SHI Yongzhao HUA Jianglong YU Xiwang DONG Zhang REN | 2022 | Frontiers of Information Technology & Electronic Engineering2022，23，7： | 0 |
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