bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on multi-UAV hierarchical task allocation in large-scale scenarios
Authors: Wang Qiang , Han Xingye , He Weizhen , Cheng Yongsheng 
Published: June 2023

Abstract
The task allocation problem of multiple UAVs in large-scale scenarios has the characteristics of large amount of computation, poor real-time performance, non-convergence or slow convergence. Therefore, this paper designs a hierarchical task allocation method to solve the task allocation problem when multiple UAVs perform large-scale tasks. The problem is divided into two sub-problems, task clustering and task ranking, by using a hierarchical structure, which effectively reduces the scale of solution. The high-level task clustering is used to determine which UAV performs which tasks, and the clustering algorithm based on auction criteria is used to perform task clustering; the bottom-level task sorting is used to obtain the best task execution sequence for the UAV to perform its corresponding tasks. The ant colony algorithm(ACO) is used to sort tasks. The simulation results show that the proposed algorithm can effectively solve the multi-UAV large-scale task allocation problem, and has good realtime performance and convergence.
Research on the Cooperative Attack of Multiple Guided Bombs
Authors: Wang Mingxiang , Wang Xiaoguang , Zheng Yuanxun 
Published: June 2023

Abstract
In order to enhance the coordinated strike capability of multiple guided bombs attacking ground targets, this paper studies the time-consistent strike problem of multiple guided bombs on the ground targets. First, for the nonlinear motion model of the bomb and the target, under the assumption that the speed of the bomb is constant and the target is stationary, the problem of simultaneous strikes of multiple guided bombs on the ground target is transformed into the remaining flight time and the velocity deflection angle of the bomb under the second-order integrator model, and a cooperative guidance law is designed in the longitudinal plane to solve the time-consistent strike problem of multi-guided bombs without a leader. Furthermore, in order to ensure the accurate determination of the cooperation, the time-consistent strike problem of the dynamic change of the bomb speed is considered in the leader mode, and the velocity deflection angle is used to design the cooperative guidance law in the horizontal plane, combined with the proportional guidance law of the longitudinal plane, to ensure the consistency of followers and leaders. Finally, the backstepping method is used to generalize the design of the velocity deflection angle for consistency to the design of the vertical overload, and the low-pass filter is used to further reduce the computational complexity. The simulation results show that the cooperative guidance law can ensure that multiple guided bombs can strike the target almost simultaneously, which proves the effectiveness of the cooperative guidance law.
Distributed Cooperative Formation Control for Multi-agent System based on Virtual Centre Strategy
Authors: He Weizhen , Cheng Yuzhen , Peng Pei , Yuan Yuwen , Li Shixuan 
Published: June 2023

Abstract
In this study, a distributed cooperative formation consistency control strategy is investigated for multi-agent system (MAS) to achieve formation consensus. Firstly, the virtual-centre-based reference formation is presented. Then a distributed cooperative formation control law based on virtual-centre is developed for MAS to achieve formation consensus. Finally, the new control scheme is applied to MAS consisting of 5 UAVs and the resulting closed-loop MAS is stable. The effectiveness of the new cooperative control behavior strategy is verified by simulations.
Research on the Working Performance of UAV Hybrid Power System Based on Mission Profile
Authors: Chai Xiyuan , Fu Xin , Zhai Shijie 
Published: June 2023

Abstract
Currently, UAVs can be divided into two main types based on the type of power unit, fuel-powered UAVs and electrically powered UAVs. Most drones that are generally smaller and lighter in weight are electrically powered; while larger drones are usually fuel-powered. Both have their advantages and disadvantages, with fuel-powered drones being highly polluting and noisy, while electric drones usually have a shorter range. Fuel-powered UAVs are noisy and polluting, while electrically powered UAVs are usually shorter. The hybrid system combines the advantages of both and reduces pollution while ensuring a longer range. In this paper, an oil-electric hybrid power system for a tilt-rotor UAV is studied, a mathematical model of the hybrid power system is built, and the performance of the hybrid power system is studied and analyzed based on the mission profile. The mission profile of the UAV is determined, and the UAV demand power curve under this mission profile is given. The overall performance of the oil-electric hybrid power system is simulated and calculated. The results show that the oil-electric hybrid power system meets the power demand of the tilt-rotor UAV under the mission profile given in this paper, and can work normally within the full envelope.
Adaptive random sample consensus method for ground filtering of airborne LiDAR
Authors: Zheng Zhen , Wang Chengjun , Liu Haodong , Tan Yuran 
Published: June 2023

Abstract
Ground filtering is an essential step in the comprehensive processing of airborne LiDAR point clouds. However, the performances of existing ground filtering algorithms are usually affected by manual thresholds, and many algorithms have high complexity and are not suitable for applications with high timeliness requirements. In this paper, a fast ground filtering algorithm for airborne point clouds based on Random Sample Consensus (RANSAC) and adaptive threshold acquisition is proposed. Statistical filtering algorithm is used to filter out outliers and abnormal points based on the Z-scale sequence of the point clouds, the threshold is adaptively obtained according to the filtered Z-scale sequence, and then the adaptive threshold and RANSAC are combined to achieve rapid ground filtering. The proposed algorithm is used to perform threshold calculation and ground filtering on point clouds dataset and real-world point clouds, the results show that the adaptively obtained threshold is located in the optimal threshold interval, and the algorithm in this paper can extract ground points quickly and with small errors. The proposed method provides a reference algorithm for the airborne point clouds processing field that requires high timeliness, such as reconnaissance and Strike Integrated UAV, ground target identification and tracking, etc.
The investigation of lateral/heading characteristics and the influence of jet control at high attack angle
Authors: Zhao Xin-yang , Chen Kun 
Published: June 2023

Abstract
When the aircraft does high maneuvers at a high attack angle, the rapid transition of flight state induces a series of complex flow phenomena such as flow separation and vortex breakdown, leading to a series of uncommanded motions such as self-excited roll oscillation, which brings great danger to the flight of the aircraft. Therefore, it is important to investigate the mechanism of this phenomenon and suppress it. In this paper, the numerical method is based on Lattice Boltzmann Method (LBM) and Large Eddy Simulation (LES) for the SACCON standard flying-wing layout aircraft model. The accuracy of the numerical method is validated by comparing the simulation results of aerodynamic loads at different attack angles with the experimental results. Then the phenomena of the vortex breakdown and shedding at different roll angles and sideslip angles at high attack angles are analyzed, and the relationship between the jet flow coefficient and the control moment is obtained by adding the jet flow to the fuselage. Finally, the rolling motion of the aircraft is simulated in the dynamic simulation. The simulation results show that the model generates self-excited roll oscillations around a nonzero mean angle at high attack angles. The dynamic numerical simulation based on the LBM method can be an effective complementary tool for the study of the dynamic characteristics of the aircraft with a high attack angle.
Research on Timing Compensation of Shadow Photograph System with Three-sequence Laser Sparking
Authors: He Zhen , Luo Honge , Kong Xiaofang 
Published: June 2023

Abstract
The accuracy of the laser sparking time interval measurement plays a key role in the measurement results when the projectile velocity is measured by shadow photograph system with three-sequence laser sparking. By comparing with the original single-chip measurement results, it was found that there was a certain deviation in the measurement results of the laser sparking time. Then the principle of the laser sparking time measurement circuit is introduced in detail, and the reasons for this error phenomenon are summarized. And analyze the original laser sparking time measurement data column and the data column accurately measured with an oscilloscope, use the Pearson correlation coefficient to describe the correlation between the two data columns, and obtain the sample correlation coefficient, the first laser sparking interval coefficient r1=0.50, the second laser sparking interval coefficient r2=0.52. According to the three-level division rule, when 0.4≤|r|<0.7, the two variables are significantly correlated. In order to compensate the original data, it is necessary to find a suitable Δ value to minimize the residual sum of squares of the measured column data after compensation. The mathematical model is developed and solved for the nonlinear system of equations, and the optimal value of Δ for the original data is obtained using a global search for the optimal value: Δ1= 0.238μs, Δ2= 0.201μs. Comparing the compensated data with the original data, The standard deviation of the measured columns of the first flash interval decreased from 0.117μs to 0.022μs after compensation, and the second decreased from 0.102μs to 0.014μs. This shows that the two columns error of compensated data are significantly reduced, which is important for the improvement of the velocity measurement accuracy of the target channel.
Solid Rocket Motor Propellant Grain Burnback Simulation Based on Level Set Method
Authors: chao-fan Han , jin-sheng Xu , Shuang-hong Wang 
Published: June 2023

Abstract
Burning surface calculation is an important item in solid rocket engine design. In order to accurately calculate the parameters such as burning surface change law in the combustion chamber, the level set based method is used for burning surface calculation, firstly, the complex burning surface is divided into a uniform grid by voxelization; then the distance transformation method is used to calculate the signed distance function, and finally the information of the contour surface in the grid is obtained to generate the burning surface change curve. The comparison with the CAD method shows that the relative root-mean-square error of the method used in this paper is within 2% with the numerical calculation results.
Effects of Cylindrical Structure on Bullet In-Bore Action Process
Authors: Li Jinming , Lu Dabin , Wang Shu , Li Fengxia , Pan Yu 
Published: June 2023

Abstract
To explore the effects of bullet cylindrical difference on in-bore dynamic engraving resistance and muzzle swing, a finite element model of bullet-barrel interaction is built. With the proposed model, real bore bottom pressure curves are obtained through experiments. In the numerical simulation, the in-bore motion processes of two all-copper bullets with different cylindrical structures are reproduced according to the real bore bottom pressure curves, so as to qualitatively analyze the relationship between bore pressure curves and bullet in-bore motion. The association between curve inflection points and bullet motion is identified, and the engraving forces of the two bullets are found to exhibit roughly the same trend. In addition, there is an abnormal phenomenon that the bullet with a shorter engraving length should have a larger engraving force. This is due to the interaction between the shape of bore pressure curves and the engraving process, as well as the larger muzzle swing caused by straight slotted structures that have a shorter engraving length. The findings of this study can provide a basis for the design of internal ballistics and the further analysis of the effects of in-bore motion on external ballistics.
Research on adaptive normalization method for attitude measurement of rotating projectile based on four-axis infrared
Authors: Chao Hongxiao , Cao Zhiyuan , Cao Yihan , Pu Xiongzhu , Song Yang 
Published: June 2023

Abstract
In view of the problems that the current attitude measurement method of rotating projectile based on three-axis infrared needs to normalize the sensor according to the surrounding environment in advance, resulting in the troublesome application of infrared attitude measurement method and insufficient environmental adaptability, an adaptive normalization method for attitude measurement of rotating projectile based on four-axis infrared is proposed. Based on the mathematical relationship between four-axis infrared sensors, an adaptive algorithm for the output amplitude and offset of infrared sensors is designed, which can realize the adaptive normalization of the environment of infrared sensors at any time. By building the semi-physical experiment and changing the surrounding environment, it is proved that the adaptive normalization method of rotating projectile attitude measurement based on four-axis infrared is effective, which provides convenience for the use of infrared attitude measurement method and further improves the infrared attitude measurement theory.
Study on the influence of barrel venting on the overload waveform of projectile in bore
Authors: Zhao Na , Chao Hong-xiao , Cao Yong-jie , Dou Song-song 
Published: June 2023

Abstract
In order to evaluate the anti shock overload ability of electronic components and parts in explosive device launcher, half sine wave generator with certain amplitude and pulse width is often used to verify it. In this paper, gun launcher is used as the shock wave generator. Different charge structures are studied for the interior ballistics process of barrel with or without venting according to certain requirements of mechanical overload. The influence of different charge structure, chamber volume and vent hole size on the overload waveform of projectile in the process of interior ballistic is studied by numerical simulation. The simulation results show that the larger the vent diameter is, the closer it is to the standard waveform. The research results can provide references for the matching design of projectile and artillery, the research and development of intelligent ammunition and the assessment. The research results can provide for the matching design of new artillery projectile and artillery and the research and development of intelligent ammunition.
Modal Research on Photoelectric Turntable of a Medium Caliber Tracked Anti-aircraft Gun
Authors: Chen Chen , Wang Hua-ting , Cheng Guang-wei , Zeng Yu-yun , Chen Xiao-ming 
Published: June 2023

Abstract
Aiming at the problem of violent vibration of the photoelectric turntable caused by the high frequency firing work load during the firing of a medium caliber tracked anti-aircraft gun, the tracking accuracy of the photoelectric tracker is unstable, and the law of the vibration of the gun on the platform is obtained by combining mechanical simulating and experiment. According to the finite element theory, a model of certain type of the gun is built, modal analysis is carried out through the ANSYS Workbench, the natural frequency and mode shape of the turntable are gained, and the hammering method modal test is carried out to verify the simulation outcomes. Through the strength check of the gun mount assembly under three typical working conditions, the weak link in the structural design is found. The results show that the research results can provide a reference for the structural design optimization of the photoelectric turntable on a vehicle-mounted antiaircraft gun.
Research on Electromagnetic Protection Characteristics of Vehicle-mounted Electromagnetic Railgun Launcher Lifetime Counting Device
Authors: Jin Yinxiang , Wang Dawei , Guo Zhangxia , Zou Libo , Chen Jiahao , Xie Jingyun 
Published: June 2023

Abstract
When the vehicle-mounted electromagnetic gun is launched, the vehicle body is subjected to strong arc reaction, magnetic field interference and shock wave phenomenon. By establishing the external magnetic field model of the multi-tube launch chamber, the electromagnetic protection characteristics of the vehicle-mounted electromagnetic gun launcher’s full-life counting device are studied, and the magnetic field characteristics during launch are analyzed by COMSOL software, and the distribution position of the counting device is selected. Then, based on the electromagnetic shielding technology, conduct anti-interference technology research on the counting device, adopt the method of combined shielding, compare and analyze the shielding effectiveness of each shielding body, and propose the best shielding scheme. The life counting device works safely and normally. Therefore, the research method in this paper can provide an electromagnetic shielding scheme for the anti-jamming technology of the remaining electronic equipment of the vehicle-mounted electromagnetic gun, and can provide guidance for the design of the vehicle-mounted multi-barrel electromagnetic gun launching system.
Research on the deployment of communication networks in circular areas under field conditions
Authors: Wang Yi , Chen Zhihua 
Published: June 2023

Abstract
This paper provides a solution for the deployment of communication nodes for network coverage in a circular area in a field environment. First, considering the overlapping of communication node coverage areas, two deployment methods are proposed, namely the regular hexagonal and the ring deployment methods, based on deployment from the center of the circle outwards and from the circumference of the circle inwards. Then, the number of nodes required for the regular hexagonal deployment method is derived and proved, and the calculation of the minimum number of communication nodes required for the ring deployment method is given. Finally, the optimal selection interval for the communication radius of the nodes is obtained through simulation, and the selection criteria for the two deployment methods are given based on the ratio of the point communication radius to the radius of the operational area.
Simulation and Experimental Study on Coupling Effect of Fuze under Ultra-wide Spectrum Strong Electromagnetic Pulse
Authors: Lv Sining , Xiao Chuan , Lou Wenzhong , Su Wenting , Zheng Fuquan 
Published: June 2023

Abstract
The lack of anti-strong electromagnetic interference ability of fuze has become an important aspect restricting the effectiveness of weapon system. Taking a certain type of fuze as an example, this paper analyzes the coupling mechanism of ultra-wide spectrum transient strong electromagnetic pulse to the fuze, analyzes the action mode of aperture coupling and field line coupling, establishes the mathematical model of space electromagnetic field, and then simulates the effect of aperture coupling and field line coupling of the fuze by using CST Microwave Studio software. It is concluded that the strongest coupling state is when the polarization direction of the electromagnetic field is parallel to the axis of the fuze. Combined with the theory and simulation, the ultra-wide spectrum transient strong electromagnetic pulse simulation system is used to conduct the strong electromagnetic pulse irradiation test, and the electromagnetic pulse effect threshold is obtained. It is concluded that the effect threshold leading to communication failure is about 27~40kV/m, which provides a certain theoretical and experimental basis for fuse strong electromagnetic protection.
Analysis on reliability evaluation standards of Initiating devices about “duds” checkout efficiency
Authors: Li Fang , Ma Hong , Li Li Ming , Han Xu Dong , Zhang Rui , Liang Ma Hong 
Published: June 2023

Abstract
The detecting efficiency about “duds” is studied by the simulation according to the standards GJB376-1987 and GJB 8185-2015 in this paper. The note and advice are given when the standards are used. The results show that detecting efficiency according to the GJB376-1987 is better than the GJB 8185-2015.
Study on the influence of constraint conditions on the slow cook-off response characteristics of melting and casting explosives
Authors: Zheng-feng Liang , hai Deng 
Published: June 2023

Abstract
In order to study the slow cook-off test response characteristics of melt cast explosive and cast explosives under different constraint conditions, the heating characteristics, ignition characteristics and response law of melt cast B explosive and cast nitrate PBX explosive were studied by using self-designed slow cook-off test device when the ratio of discharge hole area to charge cross-section area Sh/Sc
was 10%, 5% and 0%, respectively. The results show that in the slow cook-off process of two kinds of charge, the shell drain hole can effectively discharge gas or part of explosive before ignition. After ignition, the pressure can be released reliably, the increase of internal pressure in the shell can be restrained, and the intensity of response can be reduced; With the decrease of the size of the drain hole, the reaction intensity increases and the damage degree of the shell increases; When Sh
/Sc
=10, the combustion reaction takes place in both casting charge and casting charge; When Sh
/Sc
=5, the deflagration reaction occurs in the melt casting charge, which first burns and then deflagration reaction occurs in the casting charge; When Sh
/Sc
=0, the fusion charge and the casting charge have explosive reaction; Under the same constraint conditions, the safety of cast explosive is slightly higher than that of cast explosive.
Research on the Control Method of Micro-gas Turbine Power Supply Modulation System for Primary Energy in Electromagnetic Launch Technology
Authors: Shi Yaoling , Li Yalu , Li Zhenxiao , Wan Gang 
Published: June 2023

Abstract
Combining the advantages of micro-gas turbine generation system (MTGS) and power converters, moreover, comparing the various design ideas for the primary energy of electromagnetic launch technology, we design a primary energy to meet the reliability, stability, safety and portable of electromagnetic launch technology. We discuss the control ideas and methods to be adopted in this system, the first step is to output a stable DC bus voltage through rectification, and then to step up the voltage through a series resonant converter to achieve the desired output voltage. Through theoretical analysis and simulation, it reveals the effect of this load on the performance of MTGS, and the parameter optimization design is combined with the voltage outer loop control strategy to achieve the purpose of outputting stable voltage. We used a ARM controller to implement the control of this system to measure the response curve of the system under different input commands. According to the theoretical analysis, numerical simulation and experimental results, the control strategy designed in this paper can better meet the performance index requirements of micro-gas turbine engine (MTE) and power converter as well as the control method is simple and easy to implement in engineering. The results of this paper confirm the feasibility of this primary energy application for electromagnetic launch technology.