bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical simulation and experimental research on EFP penetrating the ceramic composite armored target
Authors: Bai L H , Miao Ch , Wu H L , Zhong T , Lu R J , Zhong Ch F , Guo Y Y 
Published: July 2020

Abstract
To research the protective performance of the newly designed ceramic composite armored target against 50mmRHA EFP, this paper used AUTODYN numerical simulation software to simulate the process of EFP penetration into the ceramic composite armored target, and verified the simulation results through the target test. The results showed the mass of EFP has a great impact on its penetration capability; the designed ceramic composite armored target with 274kg/m2 areal density could effectively prevent the penetration of 50mmRHA EFP; the vertical penetration depth was about 30 mm; and the back plate had a slight back convex phenomenon. The research results can provide reference for the protective structure design of light tanks and armored vehicles.
Experimental research on thermal ignition of typical shell aluminized mixed explosive under fast thermal action
Authors: Zhao S W , Zhou G , Wang C L 
Published: July 2020

Abstract
In order to obtain the thermal ignition characteristics of the typical aluminized mixed explosive with shell under fast thermal action, this research takes the casting TNT RDX Al (THL) explosive and casting PBXN-109 explosive as the research target, and establishes the thermal ignition experiment platform for fast heating shell explosives and thermal ignition model of explosive with shell, and carries out the thermal ignition experiment of two explosives under different sizes. It uses the fast heating device to generate fast thermal action, and heat the explosives in steel restraints, which uses the thermocouple to tests the temperature history to obtain the explosion temperature and delay time of the explosive thermal ignition. The results show that: ①The explosion temperature and delay time of the two kinds of explosives increase with the ratio of heating range to explosive size decrease, and both of them are larger than the 5s brustpoint. ②In a certain error range, the model calculation values and experimental results are basically consistent, which can be used for semi quantitative predicting explosion temperature and delay time. ③THL explosive is casting type with high density and high hardness, which damaged greatly after thermal ignition. PBXN-109 explosive is a casting plastic bonded explosive with low density and soft quality, and its damage is not so serious as the THL explosive after thermal ignition.
Analysis on the two-dimensional effect of long-rod penetration
Authors: Jiao W J , Chen X W , Li J C 
Published: July 2020

Abstract
The two-dimensional (2D) effect is observed in experiments and simulations of long-rod penetration. Different nose shapes may occur in the penetration of long rods made by different materials, which will have an effect on the penetration performances. Base on the 2D model established in authors’ previous work, combining with the experimental and simulation results, the 2D effect of long-rod penetration is analyzed in present paper. According to the analysis, the basic assumption of the 2D model, the nose shape of long rods keeps invariant during the primary phase, is verified. In addition, the 2D model can briefly reflect the 2D effect shown in experiments and simulations.
Microstructure and mechanical properties of Mg-Mn alloys by friction stir welding
Authors: Luan Z J , Li M , Sun J B 
Published: July 2020

Abstract
Mg-Mn alloy is welded by friction stir welding technology to manufacture liquid-cooled components in radar equipment. The effect of welding processes on microstructure and mechanical properties of Mg-Mn alloy was analyzed. The results show that the rotation speed has little effect on the microstructure structure when it is above 1200 rpm. The strength is increased by the increase of rotation speed from 900 rpm to 1500 rpm. The highest ultimate tensile strength is about 175 MPa. Most of the welding joints show brittle fracture during tensile test.
Spatial 4U quadrilateral rolling mechanism
Authors: Wang Z Q , Liu Ch , Liu X J 
Published: July 2020

Abstract
A novel of rolling mechanism constructed by four U joints is proposed. The shape of the mechanism is quadrilateral, which consists of four U joints and four links. The straight and turning rolling can be achieved by two actuators. The DOF (degree of freedom) of the mechanism is computed by using screw theory. The rolling motion analysis and the trajectory analysis are carried out. In addition, a prototype is manufactured and a series of experiments are performed to verify the rolling capability of the mechanism.
One-legged hop of compliance control based on minimum-jerk
Authors: Zhao J X , Yao Q Ch , Xing B Y , Xu P , Liang Zh G , Jiang Ch X , Su B 
Published: July 2020

Abstract
Aiming at the trajectory planning and compliance of the one-legged hop of a quadruped robot, a method for designing the optimal trajectory of the bouncing by minimizing the jerk index is proposed, and active compliance control is used to reduce the impact of the end of the foot and improve the compliance of the one-legged. First, design a one-legged bounce strategy. The bounce is divided into three phases: take-off phase, vacant phase, and buffer phase, and trajectory optimization is performed for each phase. Secondly, a compliance control method is designed. During the bouncing process, the impact of the foot end is large, which will affect the stability of the robot and even destroy the mechanical structure of the leg. The joint level adopts force-position mixed control, and the one-legged level adopts impedance control to eliminate the impact of ground impact on one-legged. Finally, a one-legged model of a quadruped robot was established in the Vortex multi-body dynamics system. Simulation experiments have proved the feasibility of trajectory optimization and compliance control.
Foot terrain impact modeling and motion performance research of hexapod robot based on passive elastic leg
Authors: Liu Y F , Su B , Zhou L , Gao H B , Ding L , Jiang L , Zou F Q , Ma C Y 
Published: July 2020

Abstract
In order to improve the performance of the multi-legged robot, the impact of foot-terrain is an important target to measure the performance of the robot. In order to ensure the compliance contact of foot-terrain for the legged robot, it is essential to add passive spring between the calf and foot. The mechanical structure makes the leg of hexapod robot retractable passive elastic structure. For multi-legged robots with passive elastic legs, the foot-terrain impact model is presented to measure the dynamic performance and provide theoretical support for the low impact force motion planning. The traditional planning method will cause additional impact for the switching case between the swing and stance phase. This paper presents a motion planning method that considers the deformable leg structure and impact performance. The experiments have been carried out, and the results have demonstrated the effectiveness of the foot terrain impact model and motion planning method in comparison with a conventional method.
Metallic reactive materials application in fragmentation warhead
Authors: Chen J , Chen Y J , Li X , Liang Zh F , Zhou T , Xiao Ch 
Published: July 2020

Abstract
The composition, structure, manufacturing process and properties of Metallic reactive materials are introduced. The typical ternary mixture of Ni-Al-W have high density of 7.37g/cm3 and static tensile strength of 228MPa, which make the reactive fragments gain high penetration capability to perforate the target&s skin and can survive under explosive. The Ni-Al-W fragments undergo intermetallic reaction and oxidation reaction upon impacting. The energy release characteristics of Ni-Al-W reactive material were analysed. The chemical energy and pressure generated by reaction of the reactive material have a linear relationship with the impact velocity. A warhead prototype of Ni-Al-W fragment warhead was designed and the warhead explosion testing was carried out. The results show that the Ni-Al-W fragments are capable of withstanding to explosive loading with acquiring initial velocity of 2256m/s. The Ni-Al-W fragments also have advantage of perforation in area against the bi-layered space plates. The metallic reactive fragment warhead can increase the lethality of fragmentation warheads against aircrafts and phased array antenna, which increasingly get mature and have a wide application prospect.
Research on energy-absorption and failure of carbon fiber reinforced epoxy resins double cone structure
Authors: Zhao Ch F , Zhou Zh T , Ren J , Xing Ch L , Zhong J L , Zhang K B , He B 
Published: July 2020

Abstract
One of the research hotspot in strategic missile is to develop a multifunctional and lightweight composite launcher, which has a certain bearing capacity and anti-fragment penetration capability. On this basis, this paper designs the launcher’s wall by using carbon fiber reinforced epoxy resin composite double cone structure (CFREPDCS) as sandwich core layer. Due to obtain the high-speed impact energy-absorption and failure characteristic of the CFREPDCS, the quasi-static collapse experiment and the LS-DYNA finite element simulation were used. The experimental results and the scanning electron microscope show that the failure mode of the carbon fiber reinforced epoxy resin composite (CFREP) circular tube is progressive failure, which includes matrix fragmentation and fiber fracture. The CFREP circular tube with larger wall thickness has higher specific energy-absorption (SEA), approximately 58.6 J/g. The coupled relationship between SEA and mid-diameter height shows that the maximum SEA occurs while mid-diameter height reaches 8 mm. On the other hand, the change of the mid-diameter height also reflects the influence of loading direction on SEA. This study provides the significant guide to design and manufacture of sandwich carbon fiber composite launcher.
Research progress in advanced polymer matrix composites for armor protection systems
Authors: Xu J L , Chen Y W , Wang R H , Li F Q , Liu A Y , Wei H Z , Wang D Y , Li S H 
Published: July 2020

Abstract
With the changes of modern warfare modes and the development of missiles and weapons, the battlefield survivability of military vehicles is facing severe challenges. Vehicles must have high protection performance and better mobility. However, both of them are contradictory each other. The advanced resin-based composites has excellent mechanical properties and strong designability, and is one of the main technical means to solve the above problems, but it also encounters a bottleneck. In view of these situations, this paper summarizes the development of advanced composites in recent years, and discusses in detail the protection mechanism of advanced composite materials, material selection and manufacturing processes, and the latest developments and future application trends of advanced composite materials for armor protection systems.
Dynamic response analysis of discrete supported electromagnetic railgun
Authors: Wu J G , Lin Q H , Li B M , Wen Sh B , Chen D 
Published: July 2020

Abstract
In order to analyze the dynamic deformation of rails subjected to transverse moving magnetic pressure, a 3D simulation model consisting of the launcher and integrated launch package was constructed and solved with dynamic finite element method. Critical velocity effects of rail dynamics were obviously observed in the simulation results. The effects not only enlarge the rail deflections but also affect the contact status between the armature and rails. To mitigate this problem, discrete supports with different stiffness were applied in the simulation. By locally enhancing the stiffness of support, especially for the part of rails where the critical velocity happens, the dynamic responses can be effectively controlled.
The summary of missile electromagnetic catapult technology
Authors: Su Zizhou , Zhang Tao , Zhang Bo , Fan Wei , Luo Shuai 
Published: July 2020

Abstract
Missile electromagnetic catapult technology is the important application of electromagnetic launch technology in the field of missile and a great breakthrough compared with tradition catapult technology. Inducing main components and technological advantages of missile electromagnetic catapult system. Sketching technical characteristics of three missile electromagnetic launcher including coil launch, DC motor and rail launch. Introducing current development situation of missile electromagnetic catapult technology in home and abroad. Carding key technologies which restrict practicability of missile electromagnetic catapult technology. Expecting prospects for development of missile electromagnetic catapult technology.
Simulation analysis of thermal management of inductor applied to pfn under continuous discharge condition
Authors: Ma Fuqiang , Liu Xiangrong , Hao Shuangpeng , Li Zhenxiao , Li Baoming 
Published: July 2020

Abstract
The pulse forming network (PFN) is an important component of the electromagnetic launch system, and its continuous discharge performance at same frequency is of great significance for the development of electromagnetic launch system. Pulse inductor is one of the key components of PFN, which has a decisive influence on the amplitude, pulse width and wave front time of discharge current. In order to study the thermal management scheme that could meet the temperature control requirements of pulse inductors under continuous discharge condition, an electromagnetic-thermal-fluid coupling model is established, and the temperature change of pulse inductor under the condition of liquid cooling and natural cooling is analyzed. It is concluded that the natural cooling scheme cannot meet the temperature control requirements, while the liquid cooling scheme can meet it. But the disadvantage of the liquid cooling scheme is that the maximum temperature difference inside the inductor will be increased.
Research on application of bus-bar in electromagnetic launching weapon system
Authors: Ren R , Ye W , Dong Z , Liu J , Huang K , Zhang Y 
Published: July 2020

Abstract
At present, the electromagnetic launching weapon system is steadily turning to its engineering applications. Among them, the bus-bar, as a necessary link of the pulse power supply to transmit energy to the electromagnetic launcher, has high engineering requirements on its high power, miniaturization and lightweight. This paper analyzes and studies the high power, miniaturization, lightweight and other aspects of the bus-bar, puts forward a disk bus-bar, and compares it with other bus-bar, finally determines that the bus bar has the advantage of high power and miniaturization, and realizes the vehicle-mounted application.
Data acquisition system for capacitive energy storages
Authors: Gromov A B , Esafov A V , Fridman B E , Karpikov S R , Kuzmenkov V D , Serebrov R A , Shalaeva A I 
Published: July 2020

Abstract
Failures in capacitive energy storages result in destruction of faulty elements and other expensive components. Recovery of such failures requires long-term and expensive works to replace and to restore elements of the capacitive energy storage. Diagnostic hardware of the capacitive energy storages makes it possible to limit the consequences of such failures, to reduce the frequency of their occurrence, as well as to monitor the equipment and transmit information on functioning of the pulse current sources to the facility. The operation of data acquisition system in high voltage facilities is accompanied by the electromagnetic interference, and it is therefore necessary to provide the optical fiber transmission lines, the isolation of the diagnostics hardware components and galvanic isolation of their power supply.
The energy recovery sub-circuit for multiple stages of the stretch meat grinder with iccos circuit
Authors: Liu H , Peng X M , Bai P Y 
Published: July 2020

Abstract
The STRETCH meat grinder and the ICCOS are two typical inductive pulsed power supply circuits for electromagnetic launch system. On the basis of combing both, a new topology-STRETCH meat grinder with ICCOS-was put forward by Tsinghua University in 2013. After launching the railgun load, all of the remaining energy is stored in the energy transfer capacitor of the circuit. In this paper, the corresponding recovery circuit is designed for the circuit containing four STRETCH meat grinder with ICCOS circuits connected in a XRAM way in order to reuse the remaining energy. The prototype system has 4kA charging current, and thus 28.19kJ magnetic energy. More remaining energy can be recovered by triggering the related thyristors with more times. Simulation results show that the topology with the suggested energy recovery circuit can roughly recover 1/3 of the residual energy to the primary power and has potential prospects for high energy storage systems in the future.
Rapid recognition of laser-induced breakdown spectrum in laser damage
Authors: Chen Minhao , Li Wei , Yang Chunping 
Published: July 2020

Abstract
In this paper, the technology of rapid target recognition based on laser-induced breakdown spectroscopy (LIBS) data of target in the process of laser damage was studied. In terms of LIBS data classification, this paper used support vector machine (SVM), which was more advantageous in nonlinear and small sample cases, as the core algorithm. In order to solve the problem of large amount of high-precision LIBS data, which leaded to slow recognition, a segmented weighted peak intensity algorithm was proposed. Compared with the original data, the length of the spectrum vector constructed by this method can be reduced by about 10 times. Under the condition of ensuring the recognition accuracy, the recognition time of LIBS samples can be reduced by an order of magnitude. At the same time, the method can balance the recognition time and accuracy by adjusting the segment length, which has good flexibility and practicability.
Dynamic analysis of the primary breakup of an annular energetic liquid jet injecting into a confined space
Authors: Sun Ming-liang , Liu Ning , Zhang Xiang-yan 
Published: July 2020

Abstract
The Large Eddy Simulation (LES) with the Volume of Fluid (VOF) method was carried out to investigate the primary breakup dynamic mechanism of an annular energetic liquid jet injecting into a confined space. The gas vortex structure and the liquid jet formation were visualized by tracking the evolution of the phase velocity and the interface location, and hence the coalescence process of the goblet-shaped liquid jet from the annular liquid jet was reproduced. Simulation results indicate that the first coalescence is caused by the Rayleigh-Taylor instability, which is generated by the interaction between the liquid jet head and the gas in the confined space. Two kinds of large-scale vortex structure expedite the secondary coalescence and the final goblet-shaped liquid jet form. Cavities are observed on the dense liquid jet column as a result of the coalescence on the upstream. Consequently, the droplet breakup occurs more frequently on the downstream liquid jet under the gas phase disturbance. The viscous shear is created by the aerodynamic interaction, and the regular fish-scale structure is presented under the Kelvin-Helmholtz instability, which promotes the bulge surface to break into droplets. The research reveals the dynamic mechanism of the annular energetic liquid jet structural destabilization observed in the previous experiments. The combination of the structural instability and the surface instability facilitate the primary breakup of the annular energetic liquid jet, which is beneficial to improve the atomization and the combustion performance.
Numerical study of minute vortex generator jets in a turbulent boundary layer
Authors: PourRazzaghi M J , Xu C 
Published: July 2020

Abstract
The air-jet vortex generator has been proposed as a credible alternative to the more conventional vane vortex generator. Some numerical models of the flow in the neighborhood of these devices have been constricted to evaluate their potential benefits. The objective of this paper is to consider the effects of a single minute AJVG in a turbulent boundary layer on a flat plane and study the longitudinal vortex caused by merging two-minute co-rotating vortex in turbulent boundary layer. The flows were assumed fully turbulent and were solved using the finite volume, OpenFoam 5.0 on a structures grid, using SST k-ω turbulence model and standard wall functions. Predicted results were also validated with experimental data. A reasonably good match was served between the predicted and experimental Reynolds stress data. However, in compare of experimental data the longitudinal vortices were not remain along the stream and were disappeared early.
Research on muzzle response characteristics of automatic gun on launching based on rigid-flexible coupling dynamics
Authors: Li Y , Xie Y Y , Liu J , Wang K 
Published: July 2020

Abstract
In order to study the important influence for firing dispersion of muzzle response of automatic gun on launching, the rigid-flexible coupling dynamics model of automatic gun was established based on the rigid-flexible coupling system dynamics theory in software RecurDyn. And the flexible body of gun barrel assembly was set up by the modal synthesis method of dynamic sub-structure. The Hertz contact theory and flexible Bushing forces model were made equivalent to these constrained joints. According to the characteristic of automatic gun structure and continuous launching load, the dynamic vibrating response of simulation and analysis was made for the automatic gun on launching. The muzzle vibration response displacements in vertical and horizontal direction were obtained in the 300 rate of fire. Then the muzzle vibration velocity and acceleration with different structure clearance were also calculated by the finite element analysis program of the rigid-flexible coupling dynamics model of automatic gun. Through the comparison and analysis, the numerical solutions are closely matched with the experimental results. The results show that the vertical angle error of firing dispersion is less than 3.8% and the horizontal angle error is less than 10.2%. Thus, the simulation and experimental results verify the correctness and feasibility of this model. Further the structure design and optimization of automatic gun can be provided a reference foundation.
Research on fast switching interception of the real target
Authors: Wang T Y 
Published: July 2020

Abstract
In order to distinguish the decoy missile from the real in the middle of the ballistic missile flight, we proposed using image recognition and sliding-mode guidance in the kinetic energy interceptor terminal guidance phase. The paper set background on the kinetic energy interceptor in the middle course of ballistic missile flight. Due to the influence of the dummy target, the preset interception point is out of alignment and interceptors require terminal guidance adjustment. In this paper, two different global fast Terminal sliding modes are used to establish the intercept model equation. By simulink simulation comparison, it is found that the sliding mode guidance proposed in this paper can quickly and effectively switch interception orbit to hit the target.