bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical simulation of mechanical and aerodynamic interference characteristics of the separation of sabot and projectile in integrated launch package (ILP) for electromagnetic railgun
Authors: Zeng H Y , Chen K , Zhou F 
Published: December 2024

Abstract
The integrated launch package(ILP) for electromagnetic railgun(EMR) has a very high initial velocity as it launches. The sabot petals automatically disengage from the ILP after launch due to the aerodynamic force of the external flow field. Their stabilization upon separation will directly affect the flight of the core projectile of ILP and the final target striking effect. In the case of ILPs equipped with various types of sabots, the characteristics of the aerodynamic interference including surge and eddy currents, will be different during the separation. In this paper, the numerical simulations to analyze the aerodynamic characteristics of the outflow field of five types of ILPs (A1~A3 and B1~B2) in five typical separation states at zero angle of attack and Mach number 6.5 are carried out by means of the steady state solution of the outflow field in the air domain based on computational fluid dynamics (CFD). According to the results, the aerodynamic interference characteristics between projectile and sabot petals during the separation are analyzed and compared. Based on the numerical simulations, we conclude that the A1 sabot petals design exhibits favorable aerodynamic characteristics, potentially enhancing the separation process and improving the end-strike performance of the ILP.
Research on aerodynamic optimization of hypersonic missiles
Authors: Tianyang Zhang , Jiahao Zhang , Qingbo Yu 
Published: December 2024

Abstract
To investigate the impact of different components on the aerodynamic characteristics of hypersonic missiles and missiles’optimization, a numerical simulation model of the typical hypersonic missile aerodynamic optimization was developed based on Ansys/Fluent. Based on this foundation, the missile was three-dimensionally modeled using Solidworks software. Detailed aerodynamic performance analysis was conducted on its head, tail, and canard configuration, which included key aerodynamic performance indicators such as drag coefficient and lift-drag ratio. The research findings indicate that the aerodynamic performance of the missile head design significantly affects the missile structure under investigation. Appropriate increase in the number of tail fins can effectively enhance the overall aerodynamic performance of the missile, however, if the number exceeds a certain limit, it may exert a detrimental impact on performance. In addition, at high attack angles, the use of canard configuration can significantly increase the missile’s lift coefficient and stability.
Research on Guidance and Control Method of UAV for Ground Attack Missions
Authors: Zhao Juncheng , Gong Zheng , Yang Yi , Chen Yongliang , Bai Yalei 
Published: December 2024

Abstract
On the modern battlefield, suicide drones have a low ability to break through the air defense fire network when using traditional ballistics against ground targets. The adoption of ballistic trajectory with landing constraints can effectively improve the survivability of missiles and the attacking effect on ground targets. Starting from the pure proportional navigation, the relationship between the ballistic angular rate and the target line-of-sight angular rate of the traditional proportional guidance is expanded to the relationship between the missile’s overload and the target’s line-of-sight angle, so as to realize the effect of controlling the missile’s overload to indirectly control the ballistic angle to the target’s line-of-sight angle of convergence, which ensures the fast tracking of the target and at the same time, makes the missile attack the target’s trajectory more gently. Attacking the target with the overload control method guarantees that the overload of the missile during the guidance process is within a reasonable range, which effectively reduces the probability of missing the target. By selecting appropriate proportional navigation coefficients and incorporating bias terms with controlled descent angles, a three-dimensional guidance and control method is designed to achieve precise targeting with longitudinal descent angle constraints on fixed ground targets. This guidance and control method remains effective even under hypersonic conditions, as verified through hardware-in-the-loop simulation, confirming its effectiveness and precision.
Aircraft attitude signal noise reduction based on improved wavelet
Authors: Lei Yang , Tianyang Zong 
Published: December 2024

Abstract
Based on the conventional soft threshold function and hard threshold function, an improved wavelet method for aircraft signal noise reduction is proposed. The results show that copared with the traditional soft threshold function and hard threshold function, the mean relative error of SNR after noise reduction is increased by 8.93%, and the mean relative error of MSE is decreased by 16.13%. The improved threshold function has obvious advantages in the preprocessing of attitude measurement, and can better retain signal characteristics.
A systematic modeling and effectiveness evaluation framework for heterogeneous missile swarm systems
Authors: Li Xuan , Shi Renhe , Jiao Yingjie , Gao Nannan 
Published: December 2024

Abstract
Heterogeneous missile swarm employs different kinds of missiles to work cooperatively for systematic warfare, which attract much attention in recent years. In order to effectively calculate and evaluate the systematic fighting capacity of heterogenous missile swarm in different scenarios, a systematic modeling and effectiveness evaluation framework is proposed in this paper. Firstly, the combat loop is defined, where the task assignment between missiles and targets is carried out using the contract net auction algorithm. Then the systematic model of heterogeneous missile swarm is constructed in terms of Observation-Orientation-Decision Action(OODA) loop network. Finally, the uncertain self-information method is used to calculate the system’s effectiveness. It can be seen from the results of the engineering example that the framework fully considers the whole process of the combat system, which can comprehensively and effectively evaluate the system effectiveness of the heterogeneous missile swarm system.
The Impact of Magnet Structures on Target Magnetic Anomaly Detection
Authors: Tianhan Yang , Shizhong Li 
Published: December 2024

Abstract
To address the limitation of short detection ranges in conventional magnetic sensors, excitation magnetic fields can be used to enhance the target’s magnetic anomaly and thereby extend the detection range. By arranging permanent magnets to create excitation magnetic fields around the magnetic sensor, targets are magnetized, producing significant magnetic anomalies that can be detected by the sensor. Four different magnet configurations were tested in simulations to compare the response characteristics of the magnetic sensor using a typical iron rod as the target. Based on these simulations, a magnetic detection device was designed and experimentally validated. The results demonstrate that excitation magnetic fields effectively increase the magnetic anomaly and detection range compared to conditions without permanent magnets. When two permanent magnets are placed vertically with the magnetic sensor’s measurement point at the center, the excitation field has the most pronounced effect on the iron rod’s magnetization, resulting in the largest magnetic anomaly and improving signal acquisition. This study offers a novel approach to enhancing the detection capabilities of magnetic sensors.
Anti-jamming Method of FM Fuze Based on Deep Learning
Authors: Zhang Jin-yu , Yan Xiao-peng , Hao Xin-hong , Zhang Jin-cheng 
Published: December 2024

Abstract
In response to the challenges posed by sweeping jamming and Digital Radio Frequency Memory (DRFM) jamming in Frequency Modulation Continuous Wave (FMCW) fuzes, a jamming mitigation method based on deep learning method is proposed in this paper. Initially, the target beat frequency signal data affected by sweeping jamming and DRFM jamming is gathered and analysed using the Transformer method. A comparison is made between the classification and recognition outcomes of Transformer model and Support Vector Machine (SVM) methods to identify the optimal model. Subsequently, the feature information of the echo signal under interference is extracted using Empirical Mode Decomposition (EMD) decomposition, and the target features are reconstructed. Experimental results utilizing simulated data confirm that the proposed method achieves a classification accuracy of 92% and ensures that the fuze detonation distance remains within the pre-set 9 m range.
Evaluation Method for Anti-Chaff Jamming Performance of Typical Radio Fuze
Authors: Xiangli Wenting , Su Hong , Li Tie , Hou Yali , Cui Dong 
Published: December 2024

Abstract
Chaff jamming is one of the common countermeasures in electronic warfare against radio fuze. Currently, there is no unified and effective evaluation criterion and method for the anti-chaff jamming capability of radio fuze. An evaluation method for the anti-chaff jamming performance of radio fuze during the missile-target encounter trajectory phase is proposed. A dynamic echo model of chaff clouds was established. The echo signals of the chaff cloud and the target were calculated and the fuze actuation were simulated and analyzed. The results show that this evaluation method can effectively assess the anti-chaff jamming performance of typical radio fuze.
Study on the influence of the initial position of the projectile on the internal ballistic performance in the engraving process
Authors: Wu Y H , Dai J S , Lin S Y , Gao Y F , Cui K K 
Published: December 2024

Abstract
Due to positioning errors and forcing cone wear, the projectile’s initial position in the chamber will change. The initial position of the projectile will influence the initial conditions of the band engraving in the rifling, which in turn affects the dynamic impact characteristics of the rotating band in the engraving process. In the present work, a small-caliber naval gun was taken as the research object, the internal ballistic procedure was used to calculate the combustion process in the chamber, and the engraving resistance and the internal ballistic performance were comparatively analyzed. The result shows that the farther initial distance leads to a smaller chamber pressure and projectile velocity. Compared to the case where the rotating band is attached to the forcing cone, increasing the distance between the band and the forcing cone by 1mm, 2mm, and 3mm respectively reduces the maximum chamber pressure by 8.3%, 13.3%, and 15.0%; correspondingly, the projectile velocity decreases by 1.6%, 2.6%, and 3.1%, respectively; while the maximum engraving resistance exhibits a relatively small change.
Numerical simulation study on the damage characteristics of ice sheet penetration by shaped charge jet
Authors: Feng Chenghang , Yi Jianya , Wang Zhijun , Yin Jianping 
Published: December 2024

Abstract
The value of polar regions in resources, transportation, geostrategy and other aspects becoming more and more prominent, in order to develop advanced ice-breaking combat weapons and enrich the operational means of our army in carrying out polar missions, this paper establishes a numerical simulation model of the jet penetrate the ice sheet by applying the flow-solid coupling algorithm in the dynamics analysis software LS-DYNA, investigates the damage characteristics of the ice sheet under the impact of the jet and analyzed the results of the penetration of the ice sheet by shaped charge jet formed by two typical liner, to obtain the crack morphology of the ice sheet and the destruction of the law, in the same calibre and charge conditions, the jet formed by eccentric sub hemisphere liner perforation aperture is more suitable for ice-breaking open charge; in order to further study the jet penetration produced by the initial destruction of the ice sheet on the impact of the underwater explosion to break the ice, through the export of the model file restart method simulated by the jet through the ice sheet after the underwater explosion process, the results show that the initial damage formed by the shaped charge jet penetration in the study of underwater explosion ice breaking cannot be ignored, the diameter of the hole in the ice sheet increased by 13.46%, the initial hole will increase the subsequent underwater explosion on the destruction of the ice sheet.
Molecular dynamics simulations on shock response and plasticity behaviors of semi-coherent {001} Ni/Al laminate composite
Authors: Wang Yu , Hao Junhui , Liu Bin , Suo Xinkun , Fang Haijiang 
Published: December 2024

Abstract
Molecular dynamics (MD) simulations were used to explore the shock response and plasticity behaviors of a semi-coherent {001} Ni/Al laminate composite premised on interfaces. Firstly, the impedance-matching theory can reasonably explain the impacts that interfaces have on the propagation of shock waves. The findings illustrate that “reflection-unloading” occurs at the Ni-Al interfaces; however, “reflection-loading” occurs at the Al-Ni interfaces. The interfaces have been observed to have discontinuities of shock wave stress, characterized by elastic-plastic properties of heterogeneous materials adjoining the interfaces. Secondly, the stacking fault pyramids and dislocation activities in the Al layers were derived using shock modeling of a multilayer target. Thirdly, we studied the formation of stacking fault pyramids, a process involving decomposition and synthesis of perfect dislocations, and the process of FCC→BCC→HCP continuous phase transition.
Penetration resistance of spliced of constrained ceramic-metal composite structures
Authors: Wu Hao , Wu Yang , Wu Guodong , Liu Zide 
Published: December 2024

Abstract
Aiming at the problems of edge weakening effect and gap defects in ceramic metal composite structure, the anti-penetration performance of ceramic metal composite structure was studied. Based on the experimental study of ceramic metal composite structure against 7.62 mm armor-piercing incendiary projectile penetration, the numerical model of ceramic metal composite structure against penetration was established. According to the experimental results, the reliability of the numerical simulation method was verified, and the anti-penetration performance at the ceramic joint was analyzed. The results show that the aluminum alloy sandwich plate can provide effective support for the ceramic. With the increase of the thickness of the aluminum alloy sandwich plate, the anti-penetration performance of the composite structure is improved. The anti-penetration performance of the composite structure increases with the increase of the thickness of the UHMWPE backplane. When the backplane reaches a certain thickness threshold, increasing the thickness of the backplane cannot significantly improve the anti-penetration performance of the composite structure. Adding a certain thickness of metal separator at the joint can effectively reduce the damage of ceramics.
Study on precise arrangement of spherical fragments in blast-fragmentation warhead
Authors: Wang Cunhong , Li Guangjia , Xue Jianfeng , Kong Qingqiang , Kong Lin , Fu Wei , Zheng Wenkai , Cao Yuwu , Sun Xingyun 
Published: December 2024

Abstract
The fragmentation arrangement of a blast-fragmentation warhead plays a crucial role in determining its damage performance. While extensive research has been conducted on explosive detonation driving and dynamic performance, there is a lack of reports regarding fragmentation arrangement methods. This study primarily focuses on the precise arrangement of spherical fragments within a warhead, building upon the conventional cylindrical warhead design. We discuss two main types of fragment arrangements: staggered and centripetal. Furthermore, the analysis further into staggered arrangements with single-layer, double-layer, triple-layer, and multi-layer configurations, providing a theoretical calculation formula for determining the thickness of the spherical fragment module. Finally, we explore the impact of charge radius and fragment size on the module thickness, noting a gradual increase in thickness with larger fragment radius and charge radius, before eventually stabilizing. Additionally, it investigates the effects of double-layer and triple-layer spherical fragment arrangements on warhead quality using a Φ350 mm ×1200 mm cylindrical warhead. The findings suggest that staggered arrangement of spherical fragments can enhance charge quality and overall damage performance of the warhead while offering valuable insights for the designing of high-quality blast-fragmentation warheads.
Design of Command Launch Unit Real Time Simulation Software Based on Windows XP+RTX
Authors: Zhang Duo , Chang Yutong , Lyu Fang , Zhang Xiao , Cheng Simin 
Published: December 2024

Abstract
In the hardware-in-the-loop simulation environment of a certain type of tactical missile, the real-time simulation software which is developed based on the Windows XP platform is needed for simulation calculation and simulated launch control. By analyzing the overall architecture of the simulation system and the real-time principle of RTX, as well as studying the characteristics of real-time VMIC and RS422 communication in RTX environment, the real-time communication process of software is designed, and the simulation software of the transmission control unit, based on Windows XP+RTX environment, is developed. This design enables software control of simulated launch of missiles and real-time communication of data. According to the results of hardware-in-the-loop simulation experiments, the simulation software meets the requirements.
Multi-objective optimization of structural parameters for the monorail sled connecting plate
Authors: Xie LinQing , Wang Tao , Ba WeiTao , Fan Kun , Li Kang , Liu Yang 
Published: December 2024

Abstract
Addressing the multi-objective optimization of structural parameters for the monorail sled connecting plate, the static strength and modal characteristics were computed using the finite element method. The optimization objectives were set to minimize the total mass of the structure, reduce maximum equivalent stress, and maximize the first-order modal frequency. A proxy model for the finite element analysis and calculation of connecting plates was constructed based on a BP neural network, and the trained model exhibits strong predictive capabilities. During the optimization process, an improved MOPSO is introduced, merging the external archive maintenance strategy from CDMOPSO with the dynamic mutation strategy from ASMOPSO. The Pareto solution set produced by this refined MOPSO exhibits a lower IGD value. A mathematical model for multi-objective optimization of connecting plate structural parameters was established, and the Pareto solution set was calculated. Compared to the initial structure, the optimized one showed a reduction of 8.41% in overall mass, a decrease of 40.47% in maximum equivalent stress, and an increase of 34.29% in the first-order modal frequency, thereby verifying the optimization algorithm’s feasibility.
Numerical simulation of EFP forming and penetration characteristics for shaped charge with a small aspect ratio
Authors: Chen Min , Guo Huanguo , Li Peipei , Chen Tinghao , Sun Xu 
Published: December 2024

Abstract
In this paper, the effects of main charge aspect ratio, liner curvature radius, liner wall thickness, and other factors on the forming characteristics of the explosively formed projectile(EFP) were studied based on the AUTODYN simulation platform. The influence laws of various factors on the forming characteristics of EFP were obtained, and the structure of the shaped charge with a small aspect ratio was optimized. Numerical simulations showed that, in the data range studied in this paper, to obtain the ideal penetration effect, the aspect ratio of the main charge should be selected from 0.65 to 0.8, the wall thickness of the liner should be generally selected from 0.02 to 0.05 times of charge diameter (CD), and the liner curvature radius should be 90 mm to 110 mm. At the same time, the influence law of each factor on armor steel penetration is obtained, which provides a theoretical basis for selecting suitably shaped charge structures under different damage requirements.
Modelling and analysis of nonlinear dynamics of rigid-flexible coupled structures
Authors: Zhao Bingxin , Gu Xudong 
Published: December 2024

Abstract
In the rigid-flexible coupled structure, the coupling between the elastic deformation motion of the flexible structure and the wide range of the rigid body motion will make the dynamic behaviour of the structure more complicated. This paper established a class of rigid body structures with flexible attachments as a rigid body-cantilever beam coupling model. The nonlinear dynamic equations of the structure are established by taking the dynamic stiffening into consideration. The dynamic responses of the structures are obtained by numerical simulations. The results show that the transverse vibration frequency of the flexible beam increases with the increase of the angular velocity of the rigid body. Moreover, there will be a significant difference between the two results obtained by the linear dynamics model (LM) and the nonlinear dynamics model (NM) in certain situations due to the effect of the dynamic stiffness term.
Research on dynamic penetration of shaped charge jet under the condition of projectile and target rendezvous
Authors: Wang Yizhen , Yin Jianping , Xu Can , Zhang Xuepeng , Yi Jianya 
Published: December 2024

Abstract
To explore the penetration behavior of jets under dynamic impact conditions and to predict and assess the dynamic penetration power of shaped charge jets, finite element methods were employed to numerically simulate shaped charge warheads under various impact conditions. Combined with theoretical analysis, the simulations analyzed the variations in perforation and dynamic penetration depth of the jet into target plates. Using a random forest algorithm, the influence weights of different factors on the dynamic penetration depth of the jet were obtained. Furthermore, an engineering model for predicting the dynamic penetration depth of shaped charge jets was established through a linear regression model. The research results indicate that the impact velocity is the most critical factor affecting the dynamic penetration depth of shaped charge jets. The dynamic penetration depth of the jet into targets within a certain range of impact velocities is approximately linear. The established engineering model can effectively predict the penetration power of jets under dynamic impact conditions.