bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of architecture framework and intelligent development of air-to-ground precision strike system
Authors: Ma X D , Tian Zh F , He X L , Wang X G , Zhao H Y , Li J H 
Published: July 2020

Abstract
By the analytical method of system engineering, the air-to-ground precise strike system is set up. Using DoDAF (Department of Defense Architectural Framework, DoDAF), the concept of air-to-ground precision strike is built. The organization is definite and the capability requirement is analyzed. On the basis, the intelligent applications of command and control system, aircraft platform and guided munition are summarized. At last, some suggestion is put forward for the intelligent development of air-to-ground precision strike system.
Experimental study on initial ballistic characteristics of cased telescoped ammunition
Authors: Cao Y J , Yue W L , Li X S , Li Z F , Li J 
Published: July 2020

Abstract
There is a loading process after the projectile of the cased telescoped ammunition (CTA) fired in the chamber, which has important influence on the stability of interior ballistics, the firing accuracy and the gun barrel life. In order to study the characteristics of velocity and attitude in the initial motion of the projectile of the CTA, a special projectile for the initial ballistic test was designed, and an initial ballistic test system based on the high-speed camera was built. The loading process after firing was observed and the loading velocity was measured. The results show that the loading speed of the projectile is about 30m/s. The initial ballistic parameters of the projectile can be studied quantitatively and the motion attitude of the projectile can be examined qualitatively by using the initial ballistic test system based on the high-speed photography.
An active disturbances rejection controller based on fuzzy compensator
Authors: Ling Cai , Ying Zhang 
Published: July 2020

Abstract
Digital servo system has a wide application in military equipment. Position controller is one of the important parts in a servo system. Therefore control performance affect system’s capacity directly. The paper introduces an Active Disturbances Rejection Controller (ADRC) based on fuzzy compensator, which uses the fuzzy and active disturbances rejection control technique. Using Tracking Differentiator (TD) to track command signal and feedback signal, transferring them to smooth signal and separating the differentiator signal from them, which are used to build the element of front feed and error control. Fuzzy control technique is used to compensate Extended State Observer (ESO), which decreases variations range of control object. Then increase the estimate precision of extended state observer. An active disturbances rejection controller with perfect control quality is applied in a digital alternating servo system position controller. The results of measurements taken from a laboratory are shown that the proposed controller has an excellent follow precision, good instant response and high output quality. The proposed method solves several difficult problems of servo system position control, such as input signal smoothing, motional disturbance, and hard matching among parameters due to strict requirements on system precision, stability and quick response in position control.
Investigation on large responses of the streamwise velocity with the effect of spanwise Lorentz force
Authors: Zhang Cheng-Long , Jiang Dai-Wen , Zhang Hui 
Published: July 2020

Abstract
The flow of a weakly conductive fluid (i.e. seawater) can be controlled by Lorentz forces generated by the suitably chosen magnetic and electric fields, which has significant effects for applications in the drag reduction and oscillatory suppression. However, the control efficiency is very low due to the application of large amplitude for Lorentz force. Therefore, the large response, induced by a small Lorentz force, is the key to enhance the flow control efficiency. In this paper, the amplification mechanism of the velocity response with the effect of Lorentz force in weakly conductive fluids is investigated, where the Lorentz force is applied on the lower wall in the channel. The analytic solutions of the velocity responses in linear stage are derived with linear stability theory, when the amplitude of Lorentz force is far less than 1. From the discussions of the analytic solutions, the mechanism is revealed on large responses which is induced by the small Lorentz force in the flow field. The results show that the flow along the spanwise direction is induced by Lorentz force, which leads to the momentum exchange of fluids in the wall-normal direction. Therefore, the large responses of velocity are generated due to the high-speed fluids transferring to the wall. Moreover, the responses depend on the parameters of Lorentz force, i.e. wave number Kz
, effective penetration Δ, including proportional to amplitude A and square of Reynolds number Re2. With the increase of Kz
, the response decreases monotonously. However, with the increase of Δ, the response increases first (Δ<0.4), reaches the maximum at Δ=0.4, and then decreases (Δ>0.4). Finally, the maximum response is obtained and the corresponding amplification is 480, when the two parameters are optimized, i.e. Kz=2, Δ=0.4.
The differentiated generations of air bomb base on landmark technology
Authors: Hu L F , Guo J M , Wang X G , Ma X D , Fhe X , Li J H 
Published: July 2020

Abstract
The development of air bomb was closed to 100 years from World War I. In this study, the typical technologies applied in air bomb were analyzed, and the characteristics of air bomb using various technologies were summarized. The differentiated generations based on landmark technology were developed to describe air bomb, and the various types of air bomb were illustrated on corresponding.
Correlation filter for object tracking with temporal-spatial constraint
Authors: Wei Junxu , Yang Lifeng , Pu Tian , Li Jian , Peng Zhenming 
Published: July 2020

Abstract
In this work, inspired by the Passive-Aggressive learning (PA), we proposed a Temporal-Spatial Constraint Correlation Filter (TSCF) model to simultaneously constrain the spatial mask and the update direction of the filter. Firstly, the spatial regular term ensures that the background redundancy information does not interfere with the filter update during the tracking process. Secondly, the temporal regular term ensures that the spatial mask and the filter do not change dramatically. Thirdly, our proposed TSCF model can be effectively solved based on the alternate direction method of multiplier (ADMM), where each sub-problem has a closed solution. Finally, our experiments on the OTB100 benchmark shows that our tracker has efficient performance compare with many advanced algorithms, which get an AUC score of 0.599 and an accuracy of 0.794.
The influence of energy content and its expenditure on the impact sensitivity of high-nitrogen energetic materials
Authors: Zeman S. 
Published: July 2020

Abstract
On 17 high-nitrogen energetic materials (including six azido-derivatives), the paper demonstrates the relations between their impact sensitivities (Edr
) on the one hand and the volume heats (ρQmax
) or a representative of detonation pressure (ρD2
) of their explosion or their enthalpies of formation (ΔHform
) on the other. The semi-logarithmic subrelations between the Edr
and ρQmax
values are limited by the mechanism of primary fission. While the mentioned relations between Edr
and ρQmax
values for azido derivatives predominantly show the expected course, in the case of the remaining high-nitrogen EMs, the opposite is the case, i.e. an increase in ρQmax
values corresponds to a decrease in impact sensitivity. The same is valid for ρD2
values as an independent variable. Taking the energy content of the studied EM molecules, represented by ΔHform
values, instead of the heat of explosion, yields unambiguous semilogarithmic relations, according to which the growth of the ΔHform
values increases impact sensitivity. The results obtained indicate that it is necessary to distinguish between the influences of the performance and the energetic content of high-nitrogen energetic materials on their initiation reactivity.
A Novel Method for Oblate Spherical Powder with Adjustable Combustion Property
Authors: Gu H , Ding Y J , Xiao Zh L , Ying S J , Wu W L 
Published: July 2020

Abstract
In order to obtain the oblate spherical power with adjustable combustion property, a novel method was put forward combining the microporous technology and the polymer deterring technology. In this work, the oblate spherical power was foamed with the cell structure by supercritical carbon dioxide (SC-CO2), and then poly(neopentanediol adipate) (NA) was employed as the deterrent to modify the energy releasing rates in the surface. The combustion property of oblate spherical power under different processing conditions was investigated by the closed bomb tests. The results indicated that the microporous oblate spherical powder displayed the desired progressive combustion, and the combustion property of microporous oblate spherical powder could be adjusted by controlling the desorption time, foaming temperature, NA content, desensitization time and desensitization temperature. The spherical powder with skin-core structure foamed by SC-CO2 and deterred by NA provides a novel and promising method to realize the progressive combustion performance without dibutyl phthalate (DBP).
Research of environmental factors on SCB electrode plug corrosion
Authors: Li F , Zhang R , Fu D X , Du Zh H , Ma H L 
Published: July 2020

Abstract
The accelerated life test of SCB electrode plugs under different environmental stresses is designed and the test results are analyzed. The results show that single temperature stress will not cause corrosion of SCB electrode plug. Temperature and humidity stress will cause slow corrosion of SCB electrode plug. If chloride ion is introduced in the environment where temperature and humidity exist, it will lead to rapid corrosion of SCB electrode plug. At the same time, the relationship between the resistance and the corrosion degree of the SCB electrode plug bridge area and solder joint shows that the deeper the corrosion degree of the bridge area and the solder joint, the larger the resistance value of the SCB electrode plug.
Numerical simulation and experimental study on slow cook-off response characteristics of composite B
Authors: Deng H , Shen F , Liang Zh F , Wang H 
Published: July 2020

Abstract
The response characteristics of compose B explosives (Shellless and shelled) under slow heating strips were numerically simulated using a zero-order reaction kinetics model. And the slow cook-off experiment was carried out on shell explosives and shellless explosives respectively. Comparing the experimental results with the calculated results, the key parameters such as melting process, temperature field evolution, ignition time, ignition temperature and ignition area of the slow cook-off test of the cast-casting charge were obtained. The results show that when the casting explosive is heated slowly, it is a heat conduction process before melting, the internal temperature gradient is large, the temperature of the liquid explosive tends to be uniform after melting, and the upper layer temperature is slightly higher than the lower layer temperature; When the temperature rises to a certain value, the explosive decomposes to generate a large amount of gas, and can be discharged from the pressure relief hole of the casing; Eventually, a high temperature region is formed in the middle of the top layer of the liquid explosive, and the ignition reacts violently.
Influence of afterburning suppression on the combustion of solid propellants: Recent progress and outlook
Authors: Li H J , Yi J H , Qin Zh , Sun Zh H , Xu Y , Wang Ch J , Zhao F Q 
Published: July 2020

Abstract
The exhaust gas, CO and H2, occupy about a half amount of combustion products, and they make the oxidative reaction with oxygen in the ambient air entraining into the plume during the combustion of solid propellants, producing shock wave, visible flash and increased infrared radiation. In order to inhibit the afterburning plume of solid rocket motors, one of the best ways is to utilize potassium salts as suppression in the propellant formulation. This review discussed and summarized the influence of a great number of potassium salts including inorganic (K2SO4, KHCO3, KCl, KNO3, KBF4, and K3Co(NO2)6 etc.) and organic (K2C2O4, Potassium biphthalate, KD, energetic K(NNMPA) and ADNPK) compounds on the decomposition kinetics, flame structures and temperature, burning rate, combustion wave structures, quenched surface of solid propellants, especially the plateau burning effect. The equipment of plume tests involves in the pressure differential scanning calorimetry, infrared (IR) radiation signature, afterburning flame length and nitrogen-filled pressure-regulating burner etc. The mechanism by which chemical inhibition occurs when certain powders are added to fuel-air flames was shown and discussed. Moreover, the exhaust properties and electron density of solid propellants were modeled and calculated. Finally, future research trends are suggested from different perspectives involving the KOH testing inside the solid rocket motors, plume signature testing and novel insoluble K compounds.
Combustion Study of Power Cartridge in Closed and Semi-Closed Vessel for Water Disruptor Application
Authors: Parate B A , Dixit V K , Chandel Sunil , Shekhar Himanshu 
Published: July 2020

Abstract
The present study deals with combustion study for comparison of power cartridge in closed (CV) and semi-closed vessel (SCV) for water disruptor application using statistical methods. The cartridges are fired in the test vessels such as CV and SCV. CV is perfectly leak proof from all sides. SCV is provided with vent 5 mm diameter keeping the same volume as that of CV. To evaluate the comparative internal ballistic performances, the firings of cartridges are carried out in CV and SCV. The gas pressure generated by the power cartridges are measured using the pressure transducer fitted over the body. It is vital task to understand the effect of vent on maximum pressure inside a test vessel. The motivation behind this experiment is to assess the maximum pressure developed and respective time inside SCV to simulate the motion of projectile to some extent through barrel. The internal ballistic parameters are evaluated in CV and SCV. The percentage drop in pressure and time are calculated. From this study, it is inferred that pressure drop in SCV is 16 percentage to that of CV. Further, an experiment revealed that pressure drop in CV is 1.2 times of SCV.
Safety design and numerical simulation of twin screw extruder for energetic materials
Authors: Ji Dandan , Xiao Yong , Huang Qiuan , Shi Huifang 
Published: July 2020

Abstract
To improve the safety performance of twin screw extruder for energetic materials, the finite element method is used to simulate the explosive moment of energetic materials in the twin screw barrels with different pressure venting structures. The explosive pressure distribution rule and the deformation of barrels are compared. The results show that the maximum pressure and maximum shear rate which can lead to explosion both appear on the top of screw flight and in the intermeshing region. When the explosion occurs in the horizontal split barrel, the second explosive pressure peak is significantly reduced and the deformation of the barrel is much smaller. In the twin screw barrel with the pressure releasing holes, two explosive pressure peaks are both high and the fixed part of barrel has large deformation. Therefore, using the clamshell type barrel can reduce the damage of equipment and improve the safety of twin screw extruder for energetic materials.
Research on high efficiency muzzle brake technology of small caliber automatic gun
Authors: Liu J B , Huang H Sh , Zhu W F , Liu Y , Zhang L 
Published: July 2020

Abstract
Muzzle brake provides a recoil force by controlling the powder gas flow distribution and velocity to reduce the recoil energy, so the study on the muzzle brake efficiency in reducing the recoil energy plays a great role. A new muzzle brake is developed, and the muzzle flow field is simulated and analyzed by Fluent. According to the simulation results, the muzzle brake structure is optimized. Precision casting technology was used to solve the manufacturing problem of complex special-shaped holes. The prototype was processed and verified by experiments. The experimental results show that the braking efficiency of the new muzzle brake is nearly twice that of the traditional structure, and the recoil force of the automatic gun can be reduced by more than 40%.
The dynamic response of cylindrical shell and square plate with pre-formed holes under blast loading
Authors: Li W , Qian L X , Feng G P , Li H M 
Published: July 2020

Abstract
The dynamic response of cylindrical shells and square plate with pre-formed holes under blast loading was studied by numerical simulation. The numerical model was calibrated by the experimental data of square plates with pre-formed holes. The dynamic responses and deformation of cylindrical shells with pre-formed holes subjected to blast loading was investigated by the same numerical model. The structure response process has been divided into four specific stages which has been discussed systematically. According to the comparison of structure response process, stress concentration between these two structures under blast loading, it is concluded that the square plates have a better performance than that of cylindrical shell with or without pre-formed holes and the influence of pre-formed holes on blast-resisting of square plate is bigger than that of cylindrical shell. In addition, the global and local deformation characteristics are mainly result from the space configuration and pre-formed holes, respectively.
Selection and analysis of material models in copper jet penetration into water
Authors: Li G , Chen X W 
Published: July 2020

Abstract
A reliable choose of material models is quite important to correctly conduct the numerical simulation of copper jet into water. In the present paper, we compared three copper models, i.e., Steinberg Guinan, Piecewise JC and Zerilli Armstrong models and two water EOS of Mie-Grüneisen and Polynomial. With referencing the experimental results, the numerical simulations of copper jet into water were carried out and analysed by employing different material models in Euler algorithm of AUTODYN. It concluded that Zerilli Armstrong model was suitable for copper and Shock EOS was suitable for water.
Experimental investigation on the velocity of the secondary fragments of reinforced concrete slabs under intensive dynamic load
Authors: Yang J Ch , Wang X , Gao W L , Sun G J 
Published: July 2020

Abstract
The initial velocity of the secondary fragments of reinforced concrete slabs under blast loading is the basic data for the analysis of damage effect and it can also serve as important basis for the damage evaluation. In this study, three different types of reinforced concrete target slabs with different thicknesses were designed and prepared. These target slabs were investigated by local damage effect tests, the flying processes of the produced secondary fragments were recorded, and the velocities of the secondary fragments corresponding to different collapse coefficients were calculated by fragment back tracking. The results demonstrate that the initial velocity of the fragments was lower at a larger collapse coefficient. Based on the dimensional analysis results, the empirical formula of the initial velocity of the secondary fragments was derived. The errors between the calculated values according to the empirical formula and the experimental data were compared and found to be within 16% at a collapse coefficient in the range1.20–3.20m/kg1/3. Thus, the derived empirical formula can be used for predicting the initial velocity of the secondary fragments produced during the collapse of reinforced concrete slabs and also providing insightful reference for analyzing the damage power of the produced secondary fragments.
Research on the equivalent relationship of torpedo penetrated by underwater supercavitation projectile based on energy consumption model
Authors: Zhao Y L , Yan P , Li X , Tan B , Wei P 
Published: July 2020

Abstract
Supercavitation projectile is one of the research hotspots of underwater defence technology. The cost of underwater damage test is such high that equivalent test on land is often considered as a possible alternative. In this paper, the equivalent relationship between torpedo and related materials penetrated by underwater supercavitation projectile is studied. Firstly, a typical torpedo structure model consisting of the torpedo shell and 14 key components is constructed; Secondly, the process of underwater supercavitation projectile penetrating torpedo is divided into two stages, that is, the underwater motion of projectile before penetration and the projectile penetrating torpedo. And the energy consumption models of projectile penetrating water medium and the energy consumption models of projectile penetrating torpedo are established respectively, considering the influence of water medium on torpedo. Because the equivalent targets obtained by the vertical impact of the projectile are different at different positions of the torpedo, two typical penetration directions and typical cabin sections of the control section of the torpedo are considered in this paper. Finaly, combined with the water medium model and torpedo structure model, and based on the principle of equivalent ultimate penetration velocity and equal minimum penetration energy consumption, the full torpedo equivalent simulation model of transverse penetration and longitudinal penetration torpedo control section under underwater penetration condition considering the influence of water medium is established.
An investigation into the ballistic response of stitched plain weaves
Authors: Li H , Zhou Y 
Published: July 2020

Abstract
It has been widely accepted that yarn pull-out and windowing plays a vital role in absorbing impact energy in a protective fabric system. Stitching within the fabric has been devised to constrain the transverse and lateral displacement of the primary yarns, using conventional cotton sewing threads. This paper reports the experimental and numerical methods and results of an investigation on the mechanisms that enable higher impact energy absorption of woven fabrics with designed yarn stitching. Penetration tests were performed over a range of impact velocities from the ballistic limit up to 180 m/s. The experimental results showed that the energy absorption of the stitched fabric sample is over four times higher than that of unstitched one. For mass-normalized metrics, stitching the fabric on every other yarn yields a 146% improvement in energy absorption capacity when compared to unstitched samples. The numerical predictions suggested that yarn pull-out could be delayed or even eliminated on stitched samples, enabling the fabric to absorb more strain and kinetic energy.
Influence of pre-ignition quasi-isotropic turbulence on burning velocity of diethyl ether/air mixtures
Authors: Liu X L , Wang Y , Zhang Qi 
Published: July 2020

Abstract
This paper presents a detailed investigation on turbulent burning velocity of diethyl ether (DEE)/air mixtures under different pre-ignition quasi-isotropic turbulence. The concentration of DEE/air mixtures is the equivalence ratio ø= 1.1. The experimental result of the laminar burning velocity (uL)is 0.55 m/s, and the largest data of turbulent burning velocity (u
t) are 1.8 m/s at pre-ignition quasi-isotropic turbulence velocity at 6.2 m/s. In this work the model gives the expression on the laminar burning velocity (UL
)and turbulent burning velocity (ut
)versus the pre-ignition turbulence velocity Urms
in accordance with Williams’s theoretical model.