bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of ceramic column shape on the ballistic performance of the SiC/UHMWPE composite armor-Numerical simulation
Authors: Hu Pengcheng , Zhao Fei , Yang Haifu , Cheng Yuansheng , Liu Jun , Zhang Pan 
Published: June 2023

Abstract
Composite armors are widely used in the protection of the human body and special vehicles due to their excellent ballistic performance. In this study, the ballistic impact response of SiC ceramics/Ultra-High Molecular Weight Polyethylene (UHMWPE) composite plate subjected to fragment simulating projectiles (FSP) is investigated numerically. The influences of the head shape of ceramic column and the impact position on the failure modes, ballistic limit velocity and energy absorption capacity are analyzed. Results show that ceramic plates have remarkable bulletproof property, and the projectiles will be smashed and plastically deform during the process of penetration. UHMWPE plates play a significant role in the energy-absorption of the composite armor against ballistic impact by experiencing the bulging deformation and delamination failure. The comparison of the ballistic limit indicates that the ballistic performance of ceramic/composite armors is associated with the head shape of the ceramic column and the impact location of the composite armor. The composite armor with flat nose ceramic columns shows superior ballistic limit over the one with flat nose ceramic columns. The findings of the present study aim to guide the design of the lightweight ceramic composite armor.
Numerical study on the influence of floating ice on the water-exit hydrodynamic characteristics of a trans-media vehicle
Authors: Wang Hao , Huang Zhengui , Guo Zeqing 
Published: June 2023

Abstract
In low-temperature combat conditions, the strong interference of floating ice on the water-exit process of trans-media weapons must be considered. The evolution of the cavity shape, hydrodynamic and ballistic characteristics during the water-exit process of a high-speed vehicle penetrating water (without floating ice) and ice-water mixture were studied in comparison based on computational fluid dynamics (CFD) and the discrete element method (DEM). The results revealed that the floating ice accelerates the collapse of the attached cavity, delays the collapse time of the tail cavity, and changes the vehicle’s wet degree. The floating ice causes the vehicle to be subjected to a severe fluctuating alternating load and lasts for a longer time, which changes the trajectory characteristics of the vehicle, reducing its motion stability and intensifying trajectory deviation. The findings can provide a reference for the design and development of cross-media weapons in low-temperature environments in winter.
Numerical analysis of launch process for a foldable quad-rotor UAV
Authors: Zhang Yiwen , Cheng Cheng , Lu Anzhi , Huang Zuozhenzi 
Published: June 2023

Abstract
Foldable quad-rotor UAV has the advantages of both artillery shells and rotor UAVs and can have the ability of long-distance rapid deployment and stagnation to perform tasks. To describe the rapid deployment process of gun-launched UAVs, a simplified internal ballistic and external ballistic modeling method is proposed. The ballistic parameters such as muzzle velocity, flight velocity variation, and flight trajectory are obtained. The effects of the variation of parameters such as initial pressure on the ballistic characteristics of the gun-launched UAV are analyzed. The research shows that the quad-rotor UAV can realize long-range rapid delivery and deployment after folding and pneumatic launching. With the increase of initial pressure, the muzzle velocity and range have a nonlinear increase. The related research results provide an important reference for the improvement of the subsequent gun-launched quad-rotor UAVs.
Study on Characteristics of Dynamic Equilibrium Angle of the Spin-Stabilized Projectile
Authors: Long Zhang , Linfang Qian 
Published: June 2023

Abstract
This study calculates and comparatively tests the dynamic equilibrium angle characteristics of the spin-stabilized projectile. Based on the analysis of the spatial relationships of angular motion of the projectile, a six-degrees-of-freedom (6 DoF) motion model is constructed. Through simulation and calculation, the changing law of the main parameters affecting the dynamic equilibrium angle with time is obtained, and then the whole-trajectory dynamic equilibrium angle curve is drawn using the law and the approximate formulas for dynamic equilibrium angle calculation. With the projectile-borne geomagnetic attitude testing technology, a dynamic equilibrium angle measurement method is developed. We combine this method with the trajectory angle curves, and work out the dynamic equilibrium angle values. The accuracy of the geomagnetic measurement is verified by comparing the angle of attack values obtained by geomagnetism and high-speed photogrammetry, and the credibility of the dynamic equilibrium angle measurement method is confirmed by comparing the measured and calculated values of the dynamic equilibrium angle. This study solves the problem of dynamic equilibrium angle measurement of spin-stabilized projectiles, and obtains the dynamic change curve of the dynamic equilibrium angle for the first time, which provids a new method and technology for the research on dynamic equilibrium angles.
BDS Position and Attitude Integration Measuring for Flying Spinning Vehicle
Authors: Yaojun Li , Xiaojuan Huang , Weigang Zhang , Kang Li 
Published: June 2023

Abstract
In order to meet the application requirements of position and attitude measurement of the flying spinning vehicle, a new integrated position and attitude measurement method based on single antenna is proposed in this paper. For the navigation requirements of the flying spinning vehicle, the traditional method is to use the satellite receiver for positioning, and at the same time, use the inertial navigation system or magnetometer for attitude measurement, the combination of the two is used to complete navigation and attitude measurement. The method proposed in this paper, on the one hand, is to reduce the number of components, greatly reduce the cost of use, on the other hand, to greatly improve the reliability of navigation and attitude measurement. Based on it, this paper uses satellite carrier signal and kinematic principle to carry out the vehicle attitude measurement based on satellite received signal. After analysis of satellite carrier amplitude signal received by the flying spinning vehicle, the mathematical relationship between carrier signal characteristics and spinning vehicle roll angle attitude is studied in further. Based on this, an integrated estimation method of satellite navigation and attitude measurement based on single antenna is proposed. At the same time, on account of the kinematics principle, satellite navigation is used to estimate the velocity vector without the use of inertial navigation system and magnetometer. Velocity vector is used for three-dimensional pseudo attitude kinematics mathematical modelling, and then by calculating and Euler attitude matrix transformation, the pseudo attitudes will be transformed into the inertial system coordinates. Experimental results show that the precision of attitude measurement can meet the actual engineering requirements.
Effect of various reinforcement shapes on the ballistic resistance of reinforced concrete slabs
Authors: Patnaik Gyanesh , Rajput A 
Published: June 2023

Abstract
Concrete structures are often subjected to extreme hazards such as projectile, missile impacts, crash, and blasts. So, evaluation of ballistic resistance of such structures against impact loading has become important. The present study is aimed to evaluate the effects of different shapes of reinforcement on the ballistic performance of slab to improve the state-of-the-art in protective design of structures. A finite element (FE) based model was framed in ABAQUS/Explicit to determine the perforation characteristics of reinforced concrete (RC) targets. The reinforced square targets were impacted by a rigid ogive nose steel projectile for wide range of velocities. Appropriate material models were adopted to simulate the response of concrete and steel reinforcement respectively. The model was validated with the experimental results and further, the validated model was used to perform the numerical simulations. The influence of various shapes of reinforcement on the ballistic resistance of RC targets was evaluated and compared. Among the compared shapes, the extended spiral reinforcement was found to have better ballistic performance. Consequently, the findings of this study can have implications in the design of protective structures.
Research on rotational angular velocity of preformed fragments
Authors: Jiahao Hou , Tong Zhuo , Zhiwei Guo , Yupeng Shi , Kai Sun 
Published: June 2023

Abstract
The rotational angular velocity of fragments under the driver of explosive products makes the fragments constantly flip during the trajectory, which has a huge effect on the velocity decay of the fragments. In order to more accurately calculate the residual velocity of the fragments during flight, it is necessary to study the rotational angular velocity of the fragments. Based on the paper target system, an experimental method for measuring the angular velocity of fragments is proposed. By using ANSYS/LSDYNA finite element software, the rotational angular velocity of preformed fragments under explosion is studied. A new meshing method is proposed to simulate the driven process of the explosive products on the fragments more accurately. The experimental results and the numerical simulation results are considered to be consistent within the margin of error. And at last, the distribution of fragment is studied base on numerical simulation. The research results provide a foundation for studying the trajectory of preformed fragments after explosive driven.
Experimental study on propagation characteristics of rotating detonation wave of liquid kerosene with oxygen-enriched air
Authors: Han Xinpei , Zheng Quan , Huang Hanli , Xu Pufeng , Wu Xingang , Weng Chunsheng 
Published: June 2023

Abstract
In order to study the propagation characteristics of rotating detonation wave (RDW) of liquid fuel, an experimental study was carried out with liquid kerosene at room temperature as fuel and oxygen-enriched air with oxygen volume fraction of 38.5% as oxidant in this paper. RDW with equivalence ratio in the range of 0.65~0.9 was successfully obtained by controlling kerosene mass flow, and a detailed analysis of propagation characteristics of RDW was carried out. The results show that with the increase of equivalence ratio, the propagation state of RDW gradually changes from the premature flameout of discontinuous detonation to the complete operation of continuous detonation. The flow blockage of the injectors will further worsen the mixing effect under low equivalence ratio conditions, resulting in the discontinuous detonation phenomenon of repeated flameout-initiation process in the combustion chamber. In this study, almost all detonation waves operate in two-counter RDW mode, except that there is a single wave mode in a short period after flameout-initiation process.
Experimental and simulation investigations on perforation of titanium alloy plates against armor-piercing projectile at oblique impacts
Authors: Zhao Li , Xuguang Sun , Zhongfeng Zhou , Xiaoce Sun , Sicong Qiu , Cheng Liu 
Published: June 2023

Abstract
Titanium alloy is an advanced lightweight armor material, widely used in armored vehicles. Experimental and simulation investigations on perforation of titanium alloy plates impacted by armor-piercing projectiles were performed in this study. The critical ricochet angle and failure morphology of 6 mm, 8 mm, 10 mm and 12 mm titanium alloy plates subjected to projectiles were obtained. Simultaneously, Numerical simulations of the oblique perforation of titanium alloy plates were then performed on the high-performance computer using the explicit finite element code LS-DYNA, and the validity of the numerical model was verified by comparing with the experimental results. Furthermore, typical process of projectile oblique penetration into titanium alloy target plate was analyzed and the influence of factors such as inclination angle and thickness on the ballistic performance of titanium alloy plates were discussed. It is found that the residual velocity of the projectiles decreases with the increase of inclination angle of target, indicating that increasing the inclination angle of the target plate can significantly reduce the perforation performance of armor-piercing projectile. In addition, the critical ricochet angle of titanium alloy plate is sensitive to its thickness, and larger thickness can reduce the critical ricochet angle of the titanium alloy plate.
Effects of Engine on Penetration Performance of Semi-Armor Piercing Warhead
Authors: Liu Ji’an , Gu Wei , Jing Tong , Yu Wanqian , Gao Hongchao 
Published: June 2023

Abstract
In the structural layout of missiles and rockets, the engine is generally placed behind the warhead. In order to investigate the effects of the engine on the penetration performance of semi-armor piercing (SAP) warheads, this study numerically simulated the oblique penetration of an SAP warhead and a free-flight rocket into armor plates. The results showed that under the condition of oblique penetration, the compressive force the warhead underwent was asymmetric and that attitude changes made the body of the warhead easily compressed by the target plate. In addition, the constraint of the engine was found to suppress warhead deflection and reduce projectile deformation.
Numerical research of high-speed oblique water-entry of projectile based on rigid body and fluid-structure interaction model
Authors: Liu Xiangyan , Huang Zhengui 
Published: June 2023

Abstract
When a projectile enters the water at high speed, the projectile can suffer a huge impact of water. If a deformation occurs in the structure of the projectile during water-entry, the numerical method based on rigid body model will be limited, while the accuracy and precision of the results can be affected. The two numerical methods of the rigid body and fluid-structure interaction (FSI) model have been built to get the results of the oblique water-entry of the projectile in this paper. Moreover, the numerical results for the given projectile under the same water-entry conditions (initial angle of incidence of θ = 15°, initial angle of attack of α = 5°, initial speed of V = 200m/s ) have been contrasted. The results show that if a small deformation occurs in the body of the projectile during the water-entry, the numerical results of the FSI and the rigid body are different. Further, the small deformation within the limit of flexibility can change the motion attitude and the trajectory of projectile during the water-entry, meanwhile the change can cause the bending of the ballistic and the super-cavity. For the projectile with the structural response, the change in the distribution of the stress concentration area can affect the drag force suffered by projectile.
Analysis of muzzle flow field of asynchronous firing of multi barrel aircraft gun under strong convection
Authors: Xie Jingyun , Guo Zhangxia , Yuan Zekun , Jin Yinxiang , Zhang Jiangchen 
Published: June 2023

Abstract
Based on the N - S equation and the k-ε model, this article uses the dynamic grid technology to finish the numerical simulation of projectile-barrel coupling for muzzle flow field of the double-barreled aircraft gun during asynchronous firing under different incoming Mach numbers and different firing intervals. The influence law of muzzle flow field on projectile motion is studied. The results show that when there is supersonic incoming flow, the radial force on the projectile will increase with the increase of incoming Mach number. At the same time, the larger the Mach number, the earlier the radial force of the projectile will be affected. Under the same inflow Mach number, the radial force on the projectile when the double-barreled aircraft gun is fired asynchronously is significantly lower than that when fired synchronously. The larger the firing interval, the smaller the radial force on the projectile.
Research on the Trajectory Consistency based on Mahalanobis distance method
Authors: Xin Zhao , Yongxiang Ji , Xibin Luo , Shefeng Liu , Xiaolei Ning 
Published: June 2023

Abstract
For the average trajectory consistency test, the density is good, which leads to the problem of poor consistency. This paper proposes to use the Mahalanobis distance method to process the test data of two kinds of ammunition. First, each pair of values in a set of tests is obtained through experiments. The obtained data is processed by the Mahalanobis distance method for relative distance processing. Then the mean and variance of the distance data of the two ammunition are calculated. In the simulation test, the data of tests which are processed by the Mahalanobis distance method. The consistency of the two ammunition is checked according to the trajectory consistency test method. The test data using the Mahalanobis distance method can better than the data of the two ammunition in the consistency. The test data processed by the Mahalanobis distance method can improve the situation of good density and poor consistency in the consistency test, and provide technical support for the subsequent average trajectory consistency test.
Study on the Multiphase Flow Mechanism of Coupling Gas-dust Coupling Explosion in Open and Closed Vessels
Authors: Yang Zhou , Jing Qi , Liu Qingming , Liu Changqi , Wang Zhisong , Shen Yang , He Zongling 
Published: June 2023

Abstract
In order to study the flame propagation characteristics and influencing factors of gas-coal dust mixed explosion in containers, this paper quantitatively explores the effect mechanism of two-phase concentration ratio and closed section restraint mode on gas-coal dust coupling explosion by numerical simulation, comprehensively considering the coal pyrolysis model and the two-phase mass and heat transfer model. The current research results show that: in closed pipeline, with the increase of pulverized coal concentration, the gas explosion intensity of lean fuel shows a trend of first increase and then decrease. Under the methane concentration of 7%, the optimal concentration of pulverized coal is 100 g/cm3; a similar trend also occurs in the open pipe. Secondly, the two-phase flame propagation speed in the closed pipe is faster than that in the open pipe. The research results of this paper can provide scientific guidance for the prevention and control of coal mine explosion accidents.
Research on Safety Technology of Anti-Sympathatic Detonation for Grenade Assembly
Authors: Yunpeng Jia , Hao Yang , Peng Tian , Jinsong Liu , Cuiling Guo , Limin Sun , Jun Gao , Fei He , Rui Hong , Ming Yang , Wenjun Zhang 
Published: June 2023

Abstract
Base on the sympathatic detonation experiment between grenades and accessories, the actual data was obtained. The assembly link with the greatest risk of explosion was summarized by the data analysis results. Base on the obtained experimental data, the process and design requirements of the relevant assembly functional units ware proposed. On the other, the production data collected in the actual production process was comprehensively analyzed and feedback. That is possibility which fundamentally solves the risk control problem of the grenade assembly process.
Theoretical basis and performance research on advanced non-contacting ion beam manufacturing process for optical materials
Authors: Li Xiaojing , DasenWang  , Yang Wenzhi , Xu Min , Zhao Shiyan , Nie Fengming , Zhang Xu 
Published: June 2023

Abstract
Ultra-smooth surface is very important for the performance of high energy optical system in the defence field. Low quality optical elements will cause energy loss and affect the performance of the optical system. Ultra-precision manufacturing technology of optical components is the key technology to obtain high quality optical components. As an advanced ultra-precision and no-contact surface processing technology, Ion Beam Manufacturing (IBM) was studied. Based on the analysis of the relationship between the ion beam current density distribution parameters obtained by faraday scan and the removal function, more effective removal function calculation method was found, the removal function model for IBF fused silica was established. The Molecular Dynamics(MD)simulation to study interaction between incident ion and optical substrate. Ion particle motion behaviour were obtained under different incident energies. The effect of incidence angle on surface roughness were carried out, lower surface roughness by smaller angle incident, ultra-precision surface of optical components were obtained by IBF experiments.
Optimization design of a novel zero Poisson’s ratio honeycomb structure for in-plane mechanical performance
Authors: Liao Xuezhi , Wang Hongbo , Li Baoyu , Zhao Xiaoning 
Published: June 2023

Abstract
The excellent deformation performance of structure is the material basis of intelligent morphing aircraft. In this study, a zero Poisson’s ratio honeycomb structure consisting of sinusoidal corrugated walls is applied to morphing aircraft. The in-plane mechanical properties of the structure are deduced theoretically based on the assumption of small strain. According to the application requirements of tensile deformation and shear deformation, an optimization model is established with geometric parameters as optimization variables, and its mechanical properties are optimized by interior point method. The results show that the equivalent mechanical properties of the new zero-Poisson ratio honeycomb structure are greatly improved. The research provides important reference for the innovative design and optimization of honeycomb structures.
Parameter identification of contact model for tank saddle ring system based on genetic algorithm and BP neural network
Authors: Ma Yuze , Liu Feifei , Si Zhihui , Gerile Qimuge , Yang Kai , Li Haoyang , Cheng Yiguang 
Published: June 2023

Abstract
This paper is devoted to present an experimental identification method of tank saddle ring system parameters based on BP neural network algorithm and genetic algorithm. The contact parameters in mechanical system cannot be obtained directly through measurement, and it is inevitable that there will be errors between the parameters estimated by engineering experience and the real value. In this paper, a 6-degree-of-freedom swing experimental device of tank turret is built, the excitation source is 1Hz sine function, the contact stiffness and contact damping coefficient are identified by constructing error functions based on simulation results and data of four laser displacement sensors distributed around the saddle ring, by the combination of BP neural network and genetic algorithm. Then, the sensor data in the test results and simulation results are compared to further verify the accuracy of the turret model and parameter identification method.
A Novel High Efficiency Synthetic Fire Strike System
Authors: Yuan Yuwen , Wang Huifang , Niu Tianhong , Jia Qiang , He Weizhen , Peng Pei 
Published: June 2023

Abstract
A new type of multi-artillery, multi-functional, multi-purpose synthetically-arranged battle group with high-efficiency fire strike system is constructed. The hierarchical structure and weight relationship of the system are determined by the AHP analytic hierarchy process, and then the inherent ability of each performance index is calculated by the fuzzy membership degree theory. These methods are used to establish the combat effectiveness evaluation model of high-efficiency fire strike system. The analysis shows that, for different damage targets, the deployment method of the efficient fire strike battalion has significantly improved the combat effectiveness of the traditional howitzer battalion. The research results have certain reference value for other arms to improve their weapon combat capabilities, conduct joint weapon operations and evaluate system combat effectiveness.