bluuebunny/crossref_metadata_2025_split huggingface dataset:
Integrated Aerodynamic-Ballistic Performance Analysis of Morphing Missiles with Deformed Cross-sections
Authors: Zhang Ziyang , Wang Xugang , Chen Jinquan 
Published: December 2024

Abstract
To analyze the impact of various cross-sectional shapes and tailfin configurations on the flight performance of morphing missiles, an integrated aerodynamic and ballistic performance analysis was conducted on gliding extended-range missiles as the primary research subject. Utilizing an engineering algorithm, we calculated the lift-drag characteristics across different cross-sectional shapes and tailfin configurations, identifying the ellipticity ratio as the pivotal parameter influencing the missile’s lift-drag ratio, which correlates positively with overall performance. Configurations with greater ellipticity ratios demonstrate a lift-to-drag ratio advantage in the subsonic speed range, which can counteract the performance losses post-transonic range and improve the missile’s aerodynamic capabilities. The “+”shaped tailfin configuration demonstrated a lift-to-drag ratio advantage at all test speeds and showed no performance inconsistencies between speed ranges. Ballistic simulations indicate that configurations with ellipticity ratios of 1.25 and 1.50 achieve range increases of 8.9% and 19.5%, respectively, over the standard circular cross-section. Ellipticity ratio has a positive correlation with the maximum range, and the growth rate of this range slightly increases with greater ellipticity. The research findings elucidate how cross-sectional deformation contributes to the enhancement of missile performance and offer technical guidance for the design of related projects.
A pulse power supply module for launching fire extinguishing bombs
Authors: Jia Wenxiao , Zhang Yazhou , Li Zhenxiao 
Published: December 2024

Abstract
Electromagnetic launching technology has a wide range of applications and can replace conventional launching technology in many fields. In order to expand the application of this technology, the design of an induction coil type launcher that can launch fire extinguishing bombs, large-scale simulated bird bodies and other thrown bodies was completed, consisting of a four-stage coil capable of launching 10kg thrown body at an initial velocity of more than 100m/s. In order to meet the integration requirements of the launcher body, the design of a compacted pulsed power module matched to the launcher was carried out. According to the characteristics of multi-stage coil launching, the pulse discharge circuit is designed by adopting the continuity-front type topology to avoid the possible problem of induced voltage damage to the device; based on the technical specifications of the launcher, the types and parameters of the pulse power devices in the module are determined and the launch simulation is carried out for verification; measures such as high specific energy devices, shared electrodes structure, and built-in discharge devices are adopted to make the module meet the compactness requirements. The module has a rated energy storage capacity of 100kJ, a maximum operating voltage of 10kV, and a specific energy of 1.2MJ/m3. The short circuit discharge experiment and the coil discharge experiment shows that the module’s discharge capacity and structural strength satisfy the design requirements; and the actual launching experiment shows that four modules of the same type are used as the excitation source of the coil-type launcher, which can project a 10kg thrown body with an initial velocity of 103m/s at an operating voltage of 8kV.
Numerical Study on Interior Ballistics of Artillery by Using Two-dimensional Two-phase-flow Model Coupled with Heat Loss Model of Barrel
Authors: Feng Yuan , Wang Yuwei , Zhu Wenfang 
Published: December 2024

Abstract
In this paper, the numerical model of two-dimensional two-phase-flow interior ballistics coupled with heat loss of barrel was established. By using this model, the interior ballistic processes of a small-caliber artillery with different charge mass were simulated. The distribution and evolution characteristics of interior ballistic parameters, such as pressure and the motion of propellant, were obtained, and the influence of heat loss of barrel on ballistic performance was analyzed. The results showed that with an increase in charge mass, chamber pressure would be increased, the interior ballistic time would be reduced, the burnout performance of propellant would be increased, the heat transfer coefficient and heat flux during interior ballistics would be raised. As a result, the maximum value of inner wall temperature would be enhanced with an increase in charge mass. In addition, the heat loss effect of barrel would lead to a decrease in maximum chamber pressure, muzzle pressure and muzzle energy. With a decrease in charge mass, the ratio between heat loss of barrel and muzzle energy would be raised.
Interior Ballistic Calculation and Analysis of Sudden Change of Motion Resistance of a Caliber Projectile in Bore
Authors: Guo Yinghua , Li Ruijing , Zhu Wenfang , Feng Yuan , Chen Pengjie 
Published: December 2024

Abstract
In this paper, three models are established to analyze and calculate the bore explosion phenomenon of a gun, namely, constant volume combustion model, classical interior ballistic model and one-dimensional two-phase flow. From the calculation results, the one-dimensional two-phase flow model has the largest calculation value, followed by the constant volume combustion model, while the classical interior ballistic calculation value is the smallest, and the one-dimensional two-phase flow model considers the situation closer to the actual situation. The calculation results of one-dimensional two-phase flow model show that the lag of the projectile will form a certain pressure shock behind the projectile, and the amplitude of the shock is negatively correlated with the decrease of the lag speed. In this accident, because the propellant basically burns, the pressure oscillation belongs to pure gas phase oscillation, and it does not produce abnormal pressure pulse and acceleration oscillation at the bottom of the projectile, but gradually converges, which does not cause the main charge of the projectile to detonate in the bore.
Study on the Ballistic Performance of Ceramic/UHMWPE Composite Armor Plates with Fiber Constraints
Authors: Xiang He , Peng Xiangfei , Yang Yang , Niu Mu 
Published: December 2024

Abstract
Ballistic ceramic with high hardness, high compressive strength, and low density is one of the most important materials in modern armor due to its resistance against high-speed bullet penetration. However, its poor ductility results in extensive fragmentation during penetration, significantly reducing the effective protection area of the armor. In this study, a three-dimensional constraint was employed to investigate the influence of such constraint on the anti-penetration performance of ceramic/UHMWPE composite armor. Using the same winding method, three types of ceramic tiles were constrained with aramid fiber, and ceramic composite armor was prepared. The anti-penetration performance and ceramic panel damage mode of composite armor with different sizes were analyzed based on the GJB 4300A-2012 standard. The results show that the effect of fiber constraint on the ballistic performance of ceramic composite armor has a size effect. For small-size ceramic tiles, the amplitude of the enhancement in protection performance by fiber constraint is less than that of the decay in protection performance. As the size of the ceramic tile increases, its sensitivity to constraint decreases, and the ceramic volume involved in ballistic response increases, resulting in improved ballistic performance of the armor. The constraint effect also plays an important role in maintaining the integrity of the armor structure. After bullet impact, the armor maintains higher structural stability due to the reinforcing effect of fiber, not only enhancing its single-shot resistant ability but also significantly enhancing its resistance to continuous impacts.
The suppression of the common mode interference based on the matched transient voltage
Authors: Sun Liwei , Li Yong , Zhao Jicheng , Mi Changwei 
Published: December 2024

Abstract
This paper presents a new method to suppress the common mode (CM) conducted interference of brushless DC motor (BLDCM). In the proposed method, the effect of the delay on the CM conducted interferences is analyzed and the average output CM voltage is selected as the feedback variable to suppress the CM conducted interference. With the feedback variable, a compensation method is presented to reduce the CM conducted interference by regulating the duty cycle or the phase shift. The method is simple which makes highly reliable. Moreover, no extra hardware is required which saves design cost. The effectiveness is verified through the simulation and experiment, and the simulation and experimental results shows it is effective in the low and medium frequency.
Research on the design of the magazine lifting mechanism based on double scissor structure
Authors: Hua-Ting Wang , Chen Chen , Ke Huang , Chen-Xu Huang , Lei Chen 
Published: December 2024

Abstract
In view of the urgent needs of lightweight and modularization of a certain type of vehicle-mounted anti-aircraft gun, a design scheme of the magazine lifting mechanism based on the double scissor structure is proposed, the mathematical model of the lift and fulcrum of the hydraulic cylinder based on the principle of virtual displacement is established, the sensitivity of different fulcrum position parameters to the distance between the lift and the fulcrum of the hydraulic cylinder is studied, the local optimal solution is determined and the optimal lift design is realized by considering the actual installation space constraints, and the structural stiffness is verified to meet the design requirements through finite element simulation calculation. It provides a certain technical basis for the design of lightweight magazine lifting mechanism.
Study on the influence of outer liner material on the formation and penetration behavior of coated explosively formed projectile
Authors: Haiyuan Bie , Yuanfeng Zheng 
Published: December 2024

Abstract
The formation mechanism of the coated explosively formed projectile is revealed, which mainly includes the double liner impact stage, the radial coating closing stage and the metal precursor penetrator stretching stage. The results of mechanism analysis show that the edge of the variable thickness outer liner near the explosive is thinner, resulting in the impact collapse velocity of the edge is higher than that of the center, and the outer liner closes forward and collides with the sub-diameter reactive liner, thus forming a metal precursor penetrator with the outer liner as the main body and a large-diameter projectile with the reactive material. When the outer liner material is replaced with copper, steel, titanium and aluminum in turn, the tip velocity of the coated explosively formed projectile increases, the metal precursor penetrator and the trailing coated projectile can be formed. The penetration of steel target by coated explosively formed projectile is studied, the simulation shows that the penetration of steel target by coated explosively formed projectile with copper outer liner is about 1.50 CD (charge diameter), and the main penetration process concludes the hole opening of the metal precursor penetrator and the expansion with the entry of the trailing coated projectile. When the liner material is replaced with copper, steel, titanium and aluminum in turn, the density of the liner material reduces, the tip velocity of the coated explosively formed projectile increases, and the penetration depth of the steel target reduces.
Research on a Maximum Attack Zone Calculation Strategy for Air-to-Air Missiles
Authors: Peng-Cheng Cai , Yong-Liang Chen , Ya-Lei Bai , Zheng Gong 
Published: December 2024

Abstract
The maximum attack zone of an air-to-air missile is significant for enhancing the effectiveness of beyond-visual-range combat. Firstly, the target aircraft and missile models are established, as well as the missile-target relative motion model. Then, two sets of mid-course composite guidance strategies and a miss-distance-relaxation simulation strategies are proposed. The impact of miss distance is introduced into the traditional golden section search optimization, and the optimization results of the traditional golden section search are improved by relaxing the restraints on miss distance. Finally, the effects of the improved composite guidance strategy and the miss-distance-relaxation simulation strategies are verified through the simulation results of the maximum attack zone. The results show that the proposed simulation and guidance strategies can achieve a larger missile attack range.
Analysis of peak resistance and water stability of wheeled amphibious vehicles with initial trim angle
Authors: Zhongyi Xu , Xinjian Ruan , Zhiyong Yang , Jingyi He , Mengjie Zhang , Meng Gao 
Published: December 2024

Abstract
The water resistance of wheeled amphibious vehicles directly affects their water performance, and indicators such as navigation trim angle and center of gravity heave value directly affect their water stability performance. The initial trim angle of amphibious vehicles has a significant impact on these indicators, which is very important in wheeled amphibious vehicle design. This article studies the influence of initial trim angle on the water resistance, navigation trim angle, and heave value at the center of gravity of a certain wheeled amphibious vehicle through model test, providing relevant basis for designing the initial trim angle of this wheeled amphibious vehicle.
Application Research on Improving Few shot Semi supervised Network In Fault Diagnosis of Rocket Artillery Rotation Machine
Authors: Zheng Xinlei , Zhang Zhipeng , Liang Tongjia , Liao Rui , Tang Jie , Yang Dewu 
Published: December 2024

Abstract
The success of fault diagnosis based on deep learning is attributed to a large number of labeled samples. However, in the application of fault diagnosis for artillery rotating devices, the scarcity of labeled samples can easily lead to overfitting of deep learning, making it difficult to train satisfactory diagnostic models. To address this issue, we proposes using an improved few shot semi supervised network to expand the limited labeled samples. Firstly, the network utilizes a relative position matrix to map the original time-series dataset to two dimensions, which are then fed into the ResNet18 network for processing image data to extract features. Then, in semi supervised learning, threshold selection based on instance credibility inference (ICI) is used to screen the pseudo label expansion labeled dataset with high confidence. Finally, the classifier is optimized by using the extended dataset to achieve fault diagnosis. The experiment shows that the improved network method has achieved excellent fault diagnosis performance, promoting the engineering application of artillery health management.
Function survival probability simulation of armoured vehicles against armour piercing bullet fragments
Authors: Shen Zhiwei , Li Nan , Tao Zhiguo , Li Jishan 
Published: December 2024

Abstract
The formation and evolution process of armour penetrating by 12.7mm armour piercing bullet is investigated. The survival probability calculation model of key functional part of armoured vehicles is established. Through statistics, at the situation of non-lining material, the maximum scattering angle can reach 54 degrees, while, with the protection by the lining material, the maximum scattering angle can be reduced to 12 degrees. The overall kinetic energy of fragments reduces with increasing the scattering angle. The lining material exhibited the energy absorbing function. The results show that the maximum kinetic energy with the protection by the lining material is 44% of the circumstances of non-lining material. Through the arrangement of the lining material and functional part position, the functional survival probability of ammunition and vehicle control can be improved significantly.
A Tolerance Precision Control Method Based on the Internal and External Double-layer Pressure Screw Limits
Authors: Chengcheng Sun , Hongping Ma , Zhongwang Tian 
Published: December 2024

Abstract
In order to solve the problem that the assembly axial clearance of large-diameter mechanical trigger fuze delay device is large in the fuze body, a tolerance precision control method based on the internal and external double-layer pressure screw limits is proposed. The internal and external double-layer screw threads constitute two sets of independent redundant dimensional chains in distribution direction and value. The final assembly accuracy of the delay device is adjusted by the internal and external double-layer pressure screw mutually. The minimum coaxiality deviation of assembly can achieve 0 deviation, and the average accuracy of assembly coaxiality is increased by about 30.69%, which has obvious effect in reducing axis eccentricity.
Output-only time-varying modal parameter online identification method and engineering application based on TARMA model
Authors: Yu Lei , Ma Qing-Hua , Wang Zhi-Yi , Li Ze-Yang 
Published: December 2024

Abstract
The modal parameters of long-range cruise weapon systems are typically obtained through finite element analysis and ground vibration testing. However, due to the inability to simulate the system’s time-varying characteristics under flight conditions, it is customary to conduct finite element modelling or ground vibration testing based on several representative operating scenarios. Subsequently, the flight modal frequency of the system is derived through numerical interpolation. This repetitive modelling, analysis, and ground testing process is both time-consuming and resource-intensive. This paper delves into the data-driven output-only identification approach, developing a recursive identification method solely based on the output, which incorporates a time-varying auto-regressive moving average (TARMA) model. By introducing a forgetting factor, the method effectively tracks the system’s time-varying characteristics, enabling rapid and accurate acquisition of the time-varying mode of long-range guided missiles even under unknown excitation conditions. Focusing specifically on the time-varying modal identification challenge posed by a long-range cruise missile, this study performs a frequency spectrum analysis of flight telemetry data. By comparing this analysis with ground vibration experimental data, the disparities between the in-flight and ground modes are elucidated. Leveraging the recursive identification method, the time-varying modal parameters of the flight telemetry data are successfully identified. The alignment between the identified results and the spectral analysis outcomes validates the effectiveness of the proposed online identification technique for time-varying modal parameters, thereby serving the engineering requirements for finite element model refinement and attitude control system design in long-range cruise missiles.
Analysis and Decoupling Study of the Coupling Effects on Projectile Acceleration Parameters
Authors: Li Chaowei , Liu Wei , Wang Yu , Ma Lintao 
Published: December 2024

Abstract
Internal ballistic parameter testing is crucial for evaluating artillery performance and design, with projectile acceleration being a core parameter. During the firing process, projectile acceleration parameters can easily be coupled with the projectile’s modal effects and the transverse effects of triaxial accelerometers, leading to inaccurate measurements. Therefore, this paper innovatively proposes a data decoupling method to improve the accuracy of acceleration measurements. Firstly, the internal ballistic firing mechanism and the transverse effects of triaxial accelerometers are analyzed. Secondly, a simulation analysis of the projectile modal is conducted, combined with the projectile’s motion state within the barrel, to determine the modal orders and frequencies under axial stretching and compression vibration modes. Thirdly, shock tests are performed on triaxial accelerometers using a shock table to establish the relationships between triaxial acceleration signals. Finally, the projectile modal, Empirical Mode Decomposition (EMD), and the transverse effects of triaxial accelerometers are combined to decouple the acceleration signals. A comparison between the decoupled acceleration signals and theoretical data shows that the error is reduced from 8.1% to 3.2%, significantly improving the accuracy of the acceleration signals.
Study on the Micromechanical Interface Response Behavior of Propellants Based on Nano-Impact Testing
Authors: Wen Junjie , Wu Yi , Yang Junsen , Xia Hanqing , Hou Xiao 
Published: December 2024

Abstract
This study utilizes a nano-impact experimental platform to investigate the stress-strain response of propellant interfaces with two different binders, HTPE and GAP. The mechanical behavior of HTPB-AP and GAP-AP interfaces was examined at the nano-scale under varying strain rates, with experiments conducted at rates up to 100 s−1. These experiments successfully captured the strain rate-dependent mechanical properties of both propellant components and their interfaces. The experimental results align well with the rate-dependent power-law viscoplastic constitutive models developed for HTPE, HTPE/AP, GAP, and GAP/AP interfaces, validating the model’s effectiveness in describing the viscoplastic behavior of these materials and their interfaces. The study demonstrates that interfaces generally exhibit lower stress responses compared to bulk materials. HTPE shows higher initial stress responses and more pronounced strain hardening than GAP.
Design and Optimization of Multi Contact Flexible Feet for Humanoid Robots
Authors: Han Lianqiang , Li Yuxi , Zhang Jintao , Li Zhengyu 
Published: December 2024

Abstract
Humanoid robots can traverse various terrains using a bipedal motion mode, thus possessing good mobility. In recent years, the application scenarios of humanoid robots have expanded to outdoor and even wild environments, where dynamic interactions with complex environments generate significant external impact forces, affecting the robot’s stable motion. This paper designs a flexible bionic foot, optimizing the elastic coefficient of the cushioning structure by constructing a multi-contact flexible dynamic model. Through simulations and experiments, compared with a flat foot, the flexible foot designed in this paper can effectively reduce external impact forces.
Optimization Method for the Attack Trajectory of Loitering Munitions Based on Damage Pre-assessment
Authors: Yunhao Zhang , Juan Li , Jie Li , Yihai Wang , Yonghui Shi 
Published: December 2024

Abstract
In order to take into account the traditional terminal damage research while designing the trajectory of loitering munitions, this paper deduces a quantitative method which takes the detonation decision of loitering munitions as the input and outputs the damage effect on the power system of the target vehicle. A two-layer optimization model aiming at improving the damage effect and reducing the trajectory length is established, and a trajectory optimization method based on genetic algorithm is designed. The results of numerical simulation show that this optimization method can effectively and stably improve the damage effect of loitering munitions on the power system of the target vehicle, and the genetic algorithm can quickly converge to obtain the optimal trajectory solution. The work contributes to the application of terminal damage research in the overall design of loitering munitions and lays a good foundation for promoting the intelligent damage research of loitering munitions.