bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dynamic Simulation Study of Artillery Firing Mechanism based on ADAMS
Authors: Yuan Zekun , Li Lizhou , Wan Chen , Zhao Jiajun 
Published: December 2024

Abstract
A multi rigid body dynamic model is established to address the dynamic issues of the firing mechanism of a certain type of artillery during the opening and closing of the latch, which can reflect the interaction between various components of the firing mechanism during the opening and closing of the latch. By adding the constraints and forces required for the dynamic simulation of the firing mechanism, as well as the contact/collision factors of each component during the firing action, a complete dynamic simulation of the firing mechanism was conducted in ADAMS software, and the interaction between each component during the opening and closing latch action of the firing mechanism was analyzed. This provides important experimental basis and support for the establishment of the firing mechanism model, and also provides reference for the spatial adjustment and optimization of the internal structure of the wedge bolt.
Researches on projectile muzzle velocity measurement system based on high-speed camera binocular intersection measurement and laser illumination
Authors: Liu Zhuohao , Luo Honge , Gu Jinliang 
Published: December 2024

Abstract
In order to reduce the impact of muzzle flame and smoke blurring on the flight trajectory imaging quality of projectile when measuring muzzle velocity in current weapon testing systems, a projectile velocity measurement system based on sequential pulsed laser illumination was studied. The wavelength of the pulsed laser is 532nm and the narrow-band filters with the same center wavelength were put in front of the camera lens which was used to suppress the influence of the flame. The pulsed laser and the filter helped the system to capture the images of the muzzle projectile wrapped in flames. The spatial movement distance of the projectile was calculated based on the principle of binocular intersection. The flying time of the projectile was determined by the high-speed camera shooting rate and the image frames intervals. The system was used to test the muzzle velocity of the projectile fired from a 12.7mm ballistic gun. The experiment results show that laser illumination effectively suppressed the influence of muzzle flames on projectile imaging. According to the calibration and binocular vision imaging algorithms, the muzzle velocity of the projectile was calculated with an accuracy of better than 0.3%. The method can measure the initial velocity of the projectile with the help of sequential pulsed laser illumination and short exposure time (as short as 1.1μs), which has great application value for range testing.
Peridynamic study on rock impact fragmentation process for deep space exploration
Authors: Qi Yuxuan , Jiang Chunlan , Jiang Zirui , Mao Liang 
Published: December 2024

Abstract
Impact experiment has been commonly used in deep space exploration and asteroid defence. In this paper, three types of rock fragmentation penetrators are employed, and the impact fragmentation process is simulated based on bond-based peridynamic (BB-PD) C++ computational code. The validity of computation is proved by the previous experimental and numerical research. Here, the influences of impact velocity and structure on the damaged mass of rock have been analyzed. The results show that the notched penetrator performs higher rock fragmentation efficiency. The structure of penetrator plays an important role on the damaged mass under the low impact velocity, and the penetrator mass becomes significant in the case of high impact velocity. Furthermore, the rock fragmentation mechanism has been revealed by analyzing the influenced regions and interaction effect. BB-PD simulation indicates the prospect of this notched penetrator for asteroid or planet rock fragmentation application.
Cooperative guidance law design for multiple-vehicle under distributed event-triggered mechanism
Authors: Gu Zhenzhen , Wang Xugang , Wang Zhongyuan 
Published: December 2024

Abstract
To address the operational requirements of engaging important surface vessels with multiple anti-ship missiles, this paper proposes an attack time cooperative guidance law based on distributed event-triggered mechanism. This law enables multiple missiles to simultaneously engage the target with minimal communication. First, design a two-stage guidance law that includes a cooperative guidance stage and an independent guidance stage. In the cooperative guidance stage, the time-to-go estimates of each missile are synchronized through inter-missile communication to achieve consistency. In the independent guidance stage, the missiles can independently guide themselves towards the target without the need for further communication. The key to the implementation of this strategy is the time-to-go estimates can represent the real time-to-go after achieving consensus. Furthermore, an event-triggered mechanism is introduced during the cooperative stage to effectively reduce the frequency of communication required during the cluster coordination process. Finally, the stability of the proposed cooperative guidance law is proven using Lyapunov theory, ensuring the absence of Zeno behavior. Numerical simulation results validate the effectiveness of the algorithm and confirm the correctness of the stability analysis.
Optimization of anti-airport runway munitions based on NSGA-III
Authors: Sun Xichen , Yao Wenjin , Chen Bin , Huang Jingnan , Li Chengyu , Gao Yifei , Shi Ji , Feng Jun 
Published: December 2024

Abstract
In modern warfare, as important infrastructure in marine engineering, the airport runways on the reef islands are the primary targets to be struck in wartime. This paper aims to shed light on the damage problem under the working condition of initial penetration followed by explosion. The numerical simulation was conducted through the establishment of the coupled correlation model between the crater radius, effective damage radius, explosion cavity radius and crater depth, as well as the multi-objective optimization model of the damage field parameters using Non-dominated Sorting Genetic algorithm optimization (NSGA-III) to explore the optimal velocity and charge depth when the damage field parameters are maximized. The results indicate that the destruction pattern of the airport runway changed from an open crater pattern to an bulging pattern and eventually to a hidden crater pattern as the charge location moved downward. Moreover, the destruction type of the airport runways by initial penetration with the projectile velocity of 300m/s~330m/s and explosion was the bulge mode, which contributed to the best destructive effect. Additionally, the optimal velocity of projectile penetration and the mass of charge was determined to be 320.807 m/s and 2.144 kg through NSGA-III.
The influence of initiation time error on the forming effect of multi-point initiation shaped charge jet
Authors: Zhang Bo , Yao Xiaoshuo , Bie Haiyuan , Wang Haifu 
Published: December 2024

Abstract
Aiming at the jet forming process of multi-point initiation shaped charge warhead with initiation time error, the jet offset of multi-point initiation shaped charge warhead with different liner thickness, liner cone angle and initiation radius under time error was studied by using ANSYS-LSDYNA software. The results show that increasing the wall thickness of the liner from 2mm to 5mm or increasing the cone angle from 50° to 80° will enhance the anti-interference ability of the jet, and the velocity angle and offset distance of the tip will decrease. When the radius of the initiation points increases from 30mm to 45mm, the velocity angle and offset distance of the jet head show a trend of decreasing first and then increasing. In addition, when the same change occurs in the structure of the liner, the method of reducing the degree of jet offset by changing the structure of the liner has a better effect on the time error with less concentration and has a poor effect on the time error with greater concentration.
Lattice-like Mechanical Metamaterials Structure Design Method Based on Convolutional Neural Network and NSGA-II Algorithm
Authors: Dang W , Miao C , Xu J , Mu X M , Niu H Y , Lu R J , Song Z W 
Published: December 2024

Abstract
Lattice-like mechanical metamaterials have excellent mechanical properties such as ultra-low density, high specific strength, and high energy absorption, and have broad application prospects in key components of platforms such as armored vehicles, helicopters, and aerospace vehicles. Aiming at the problem of inverse design of superstructure cellular structures, a study on the design method of cellular structures was carried out. Firstly, based on the uniqueness of cellular structural characteristics and the principle of comprehensive information, the cellular structural characteristic matrix and the cellular macroscopic mechanical characteristic matrix of coupled cellular configuration and structural parameters were proposed respectively; then, with the cellular structural characteristic matrix as input data and the macroscopic mechanical characteristic matrix of the cell as output data, a superstructure material performance prediction model based on convolutional neural network was established; further, with the minimum error between the specified target value and the predicted value of the macroscopic mechanical characteristic parameter as the criterion, a multi-objective optimization function was established; finally, the performance prediction model was combined with the fast non-dominated algorithm (NSGA-II algorithm) with elite retention strategy to construct a superstructure cellular structure design model, and the effectiveness of the structural design model was verified by case studies.
The influence of wave curvature on the trajectory characteristics of a high-speed projectile vertical water entry
Authors: Zhang Yufei , Dai Qi , Zhou Biaojun , Liu Xiaohan 
Published: December 2024

Abstract
To study the ballistic characteristics of high-speed vertical impact of projectiles on wave liquid surfaces, the method of Detached-Eddy Simulation (DES) with elliptic-blending Reynolds stress model is adopted to numerically simulate the high-speed vertical water entry of projectiles under different fifth-order Stokes wave curvatures. Through experiments, the accuracy and reliability of the numerical method were verified. Based on the numerical simulation method, it is stipulated that the convex curvature of waves is positive and the concave curvature is negative, and the influence of different wave curvatures on water entry trajectories is studied. The research results show that under small curvature wave conditions, the curvature of the entry position has a negligible effect on the axial load during the water entry process; negative curvature positions delay the peak time of the axial load in the entry wave valley compared to positive curvature positions. When the projectile vertically impacts waves at the position with zero curvature at the same actual water entry angle, compared to entering a quiescent free surface, the projectile experiences slower velocity decay, larger axial body loads, earlier peak time of axial load, shorter water entry process, and the trajectory of the projectile is still influenced by the curvature around this position.
Orthogonal simulation and experimental study on SLM process parameters for micro-sized high dynamic components
Authors: Lv Sining , Lou Wenzhong , Feng Hengzhen , Xiao Chuan , Li Shiyi 
Published: December 2024

Abstract
Metal Additive Manufacturing (MAM) technology has become an important means of rapid prototyping of special high dynamic complex components. This study employs selective laser melting (SLM) as a technological approach for investigating micro-sized high dynamic components. The parameters that affect SLM process are analysed, mainly including laser power, laser speed, laser diameter, and scan spacing. Based on prior studies, feasible parameter ranges are identified, and an orthogonal experimental design table is established for simulation and experimental co-verification. Range and variance analysis are conducted and the influence ability of each influencing factor is explored from both simulation and experimental aspects. The SLM process model is established using finite element software, taking into account parameters such as residual stress and maximum deformation. The conclusion is drawn that the order of influence of each factor on the preparation of micro-sized high dynamic components is: scan spacing>laser power>laser diameter> laser speed. Samples of components are fabricated and subjected to static testing. The density of the components can reach over 99.15%, and the structural strength can reach 348 MPa, which meet the required standards and confirm the simulation analysis. The results demonstrates that SLM provides a novel manufacturing method for micro-sized high dynamic components.
Failure rate analysis of loitering munition fuze safety system
Authors: Zhang Lingyun , Li Haojie , Zhang Chuanhao , Qiao Shixiang , Wang Pu , Yu Hang 
Published: December 2024

Abstract
The projection environment and operational characteristics of new types of munitions, such as loitering munitions and drones, differ significantly from those of conventional munitions. These new munitions are characterized by a weaker projection environment, longer cruise times, and secondary strike capabilities. Current fuze safety system design methods no longer meet these requirements. Therefore, it is necessary to propose new methods for calculating fuze failure rates to ensure the reliability of the fuze safety system. In this paper, aiming at the recoverable safety system of the loitering munition fuze, combined with the operational requirements and environmental characteristics of the loitering munition, and at the same time, based on the Markov chain, the failure rate analysis of the recoverable safety system of the loitering munition fuze was carried out. Also obtain the change of the failure rate of the fuze safety system under different states.
Study on carbonization treatment of polyaniline for improving electromagnetic wave absorption performance
Authors: Wang Yan , Hu Yubing , Jiang Wei 
Published: December 2024

Abstract
In this research, the electromagnetic wave absorption technology for military stealth, focusing on polyaniline as the primary subject. Compared to polyaniline, carbonized polyaniline achieves the improvement of electromagnetic wave absorption intensity and matching thickness of materials. The optimal reflection loss of carbon derived from polyaniline is -74.51 dB at 5.40 GHz with 3.36 mm.
Research on Pulse Linear Array LiDAR Point Cloud Enhancement Algorithm in Snowy Environment
Authors: Shi Xiaolong , Gao Mingze , Wu Yanjiang , Wang Weihan , Wang Fengjie , Han Shaorong , Chen Huimin 
Published: December 2024

Abstract
LiDAR point cloud data acquisition is difficult in snowfall environment, which leads to fewer point cloud datasets in snowy days and affects the subsequent research on target recognition algorithms in bad weather. In this paper, we investigate a point cloud enhancement algorithm based on pulse linear array LiDAR in snowfall environment. We use a linear array data acquisition method to collect the point cloud data of sunny and snowy days, and the point cloud data of sunny days and different degrees of snowy days are compared. We establish a linear array pulse LiDAR acquisition model and a single-line laser snowfall simulation model. The results show that a large number of snow particles gather in the vicinity of pulse linear array LiDAR and they are conical in distribution. The simulation model can generate point cloud data close to the real snow environment.
Research on effect of the pad material on stress of the explosive charge bottom during launching artillery ammunition
Authors: Xu F , Jiang J W , Xie H W 
Published: December 2024

Abstract
Using the generalized Maxwell visco-elastic constitutive model, the stress changes of the warhead explosive charge under high axial overload condition was simulated numerically by finite element method. The influence of Poisson’s ratio and elastic modulus parameters of the pad material on the Von Mises stress of the explosive charge bottom was analyzed. The results show that when the elastic modulus of the pad is small, its Poisson’s ratio is inversely proportional to the peak stress of the explosive charge bottom, while when the elastic modulus is large, its Poisson’s ratio has almost no effect; with the increase of the elastic modulus of the pad, the stress of the explosive charge bottom first decreases and then increases; compared to metal materials and flexible materials, engineering plastic gaskets have a better effect on reducing the peak stress of the explosive charge bottom.
Research on the Penetration Performance of Zirconium Liner
Authors: Ren X T , Zhang H Y , Yu Q B 
Published: December 2024

Abstract
As the core part of the shaped charge warhead, the selection of the material of the liner has an important influence on the formation and penetration ability of the shaped charge jet. In this paper, metal zirconium is used as the material of the liner. The Autodyn-2D numerical simulation platform is used to simulate the jet formation and penetration ability of the zirconium liner under the shaped charge structure. By comparing the penetration depth and opening diameter of the same target with the conventional liner material, the penetration ability of different material liners is analysed. The results show that the zirconium liner has good penetration performance compared with the titanium liner, and has good opening performance compared with the copper liner, and the zirconium liner jet will respectively produce secondary hole expansion phenomenon and secondary necking phenomenon when penetrating thick steel target and thick concrete target; When the zirconium liner penetrates the steel target with high strength. the opening ability will gain, but the penetration ability will be impaired. Moreover, the tiny change of the target thickness has little effect on the residual velocity and the opening diameter of the zirconium liner head; The velocity loss of the jet head of the zirconium liner is closely related to the strength of the target plate and the thickness of the target plate. This relationship makes the zirconium liner more conducive to the penetration of medium strength and medium thickness targets.
Effect of hollow degree on the mechanical properties of simple cubic structures mechanics metamaterials
Authors: Yang Z Z , Xu J , Mu X M , Niu H Y , Wang Q C , Bai L H 
Published: December 2024

Abstract
The research object of this article is simple cubic mechanical metamaterials. By changing the hollow degree of the composed of cell elements, the influence of hollow degree on the mechanical properties of simple cubic mechanics metamaterials during compression is analyzed. Results reveal that properly increasing the hollow degree of components can improve the compressive strength of simple cubic mechanics metamaterials and stabilize the macroscopic energy absorption characteristics during the compression process. But as the hollow degree increases, the failure of the cell elements changes from compressive failure of the rod to shear failure at the junction, and the compressive strength of the mechanical metamaterial decreases.
Non-Singular Fast Terminal Unidirectional Sliding Mode Control for Fixed Rudder Two-Dimensional Trajectory Correction of Projectile
Authors: Feng Dewei , Wang Liangming , Yang Zhiwei , Huaiwei A , Chen Zhi 
Published: December 2024

Abstract
This study addresses the control issue of a fixed-rudder two-dimensional trajectory correction projectile. Initially, a novel roll angle controller was designed based on the unidirectional sliding mode theory and the fast terminal sliding mode theory. Subsequently, the system’s response time and robustness were enhanced through the design of a unidirectional sliding mode auxiliary surface and non-singular fast terminal attractor parameters. Finally, the stability of the designed roll angle controller, which meets the system’s stability requirements, was proven using the Lyapunov stability theorem. Simulation verification of the designed controller was conducted using simulation software, and the simulation results indicate that the controller possesses good robustness.
Simulation analysis of the influence of flow field structure changes in-bore on the barrel life
Authors: Zhao Na , Zhang Long , Li Rui , Ke Biao , Han Rufeng 
Published: December 2024

Abstract
By regulating the flow pattern of gunpowder gas and increasing the vortex dissipation intensity near the wall of the barrel, the thermal effect of gas on the wall of the barrel can be reduced, which can effectively reduce the thermal erosion of the barrel and improve its service life. Based on the initial boundary conditions determined by one dimensional two-phase flow interior ballistic model, numerical simulations were conducted using CFD method to investigate the influence of different structural shapes on the thermal flow field inside the barrel, and the corresponding barrel erosion situations were analysed for different structures. The result shows that adding a micro disturbance flow structure to the inner bore of the barrel can reduce the heat flux density at key points, thereby reducing the single shot barrel erosion and improving the barrel life. This result can provide some references for the design of artillery that needs to extend the barrel life.
Shock wave overpressure distribution behaviour in free-field by reactive filling piercing projectile penetrating multi-layered plates
Authors: Xiang J A , Yan Y G , Liu A X , Wang H F 
Published: December 2024

Abstract
The experiment of reactive filling piercing projectile (RFPP) penetrating the multi-layered structural plates is conducted to investigate the impact-induced initiation model and behind-plate deflagration shock wave overpressure mechanism is developed according to the explosion similarity principle and the one-dimensional stress wave propagation theory. The concept of effective deflagration point is proposed to reveal the propagating mechanism of deflagration shock wave. The results demonstrate that at the impact velocity of 688 m/s, the position of initiated reactive filling deflagrated behind the plates range from 0375 to 0.05192m. A significant multi-peak characteristic is presented in the relationship between behind-plate overpressure and time, as a result of the sequential impact behaviour of RFPP impacting the multi-layered plates, with the later overpressure peak exceeding the initial one.
Experimental and Numerical Study on Ballistic Characteristics of Vertical Water Entry for High-speed Truncated Head-type Projectiles
Authors: Zhou Biaojun , Zhao Zijie , Zhang Hui 
Published: December 2024

Abstract
To achieve the ballistic control method of rapid levelling the projectile after the water entry, an asymmetric head-type design is proposed. To analyze the trajectory of center of gravity of the projectile with an oblique truncated head, comparative experiments of the vertical water entry of the projectile at different velocities was conducted using a high-speed camera to obtain the trajectory and the variation of the deflection. The effects of different cutting angles and water-entry velocities on the trajectory characteristics of the projectile and the cavity flow field were investigated by numerical simulations. The results indicated that the increasing cutting angle of the projectile will increase the curvature and deflection angle of the trajectory after the projectile enters water, and the yawing angle of the projectile will increase by 5 degrees for every 5 degrees increase of the cutting angle in the study area within 9 milliseconds. The asymmetric head-type of the projectile will affect the shape of the cavity, and the cavity will appear an asymmetry and form cavities at the head and tail, respectively, and the flow field pressure will change drastically.