bluuebunny/crossref_metadata_2025_split huggingface dataset:
Early corrosion properties of titanium alloys, Ni-based alloys and stainless steel in supercritical water oxidation of sewage sludge
Authors: Yan Lijun , Xu Yaofeng , Fan Binning , Wang Daye , Xu Donghai 
Published: June 2023

Abstract
Supercritical water oxidation (SCWO) can efficiently and harmlessly dispose sewage sludge, while corrosion phenomena can lead to rapid shutdown and/or failure of expensive process equipments in a supercritical water system. The corrosion behavior of titanium alloys, Ni-based alloys and stainless steel exposed in supercritical water oxidation of sewage sludge at 450 °C, 26 MPa for 60 h was investigated by means of gravimetry, scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction. 316 SS (stainless steel) showed the highest corrosion rate, while TA10 had the lowest corrosion rate. The oxide scale on the surface of 316 SS contained magnetite and FeCr2O4, while Cr2O3 and NiCr2O4 were the main components of oxide layer on Inconel 600. Among them, magnetite and NiCr2O4 mainly existed in the inner oxide layers of SS 316 and Inconel 600, respectively. The lack of Cr2O3 on the 316 SS surface resulted in severe pitting corrosion and poor corrosion resistance.
Hybrid feature extraction method of MFCC+GFCC helicopter noise based on wavelet decomposition
Authors: Hu Wen-long , Feng Shun-shan , Zhang Bo , Gao Yue-guang , Xiao Xiang , Qi-Huang  
Published: June 2023

Abstract
Aiming at the issue that the recognition accuracy of traditional acoustic signal features is low for helicopter acoustic signals with wind noise in the near field, a method of extracting mixed noise features of MFCC+GFCC based on wavelet decomposition is proposed. Firstly, the three-layer wavelet decomposition and reconstruction are applied to the helicopter acoustic signals; then, the Mel-Frequency Cepstral Coefficients (MFCC) and Gammatone-Frequency Cepstrum Coefficient (GFCC) are respectively extracted for the approximation and detail components; next, the coefficients of detail components which are averaged are combined with those of approximation components to form the hybrid feature parameters; finally, the convolutional neural network is used to classify the signal, to realize the correct recognition of helicopter acoustic signals. Experimental results show that the recognition accuracy is improved by almost 40% in contrast with other traditional methods, such as MFCC and GFCC, when the SNR is equal to -5dB. Further, When the SNR is -10dB, the recognition accuracy is more than 49%, while the traditional methods cannot effectively recognize the helicopter acoustic targets. The proposed feature extraction method can significantly improve the recognition accuracy in the low SNR environment, and provide a reference for near-field detection and recognition of helicopter acoustic targets.
Research on strain testing technology of electromagnetic railgun’s abnormal barrel
Authors: Li Shili , Qin Peiyu , Yang Weixi , Fan Wei 
Published: June 2023

Abstract
Aiming at difficult strain test and unable to accurate strain test for electromagnetic railgun’s special-shaped barrel bore, the strain testing technology of special-shaped barrel was studied. According to electromagnetic railgun strain test characteristics analysis, the back of the rail and the back of insulation support plate are selected as the strain test points, FBG(Fiber Bragg Grating) stain sensor is embedded along the circumference of the barrel to obtain the special-shaped barrel true stain value. At the same time, in order to comparison, The papers studies the rail’s strain simulation technology for electromagnetic railgun, the simulation result is accordance with strain test result, show that stain measurement method is feasible, and measurement results is reliable. The research results can provide data support for location to position of projectile in the special-shaped barrel bore by strain feature.
Study on microstructure of rare earth Mg-9%Gd-2%Y-3%Nd -0.7%Zr alloy and properties of micro-arc oxidation films
Authors: Yang Xiaoyu , Qi Guo , Tang Shengming , Zhang Lijun , Chen Gang , Dong Jiajing , Kai Liu , Xu Hengqiu , Duan Xiuchao , Wang Yongxu 
Published: June 2023

Abstract
The micro-arc oxidation protective film has been prepared on the surface of Mg-9%Gd -2%Y-3%Nd-0.7%Zr alloy by using the microarc oxidation technique of “step by step depressurization”. The microstructure of magnesium alloy substrate and micro-arc oxidation film were measured by OM, SEM and XRD, and the properties of the film were evaluated by electrochemical test of film thickness and surface morphology. The results show that the discontinuous network multiple eutectic phases are distributed in the grain boundary and there are dispersed-granular precipitates in the alloy matrix. After the micro-arc oxidation treatment, the thickness and corrosion resistance of the micro-arc oxidation film increased with the increase of oxidation time, and the surface micropore size increased first and then decreased, and the surface morphology of the micro-arc oxidation film changed from no micro-crack to micro-crack, and finally the micro-crack disappeared.
Validity analysis of outdoor evacuation signs based on eye movement behavior
Authors: Liu Xinyan , Jiang Fan , Shi Jiguang , Ding Ning 
Published: June 2023

Abstract
In recent years, with the rapid economic development, people’s spiritual needs are also increasing, and more and more concerts and sports games appear in public life. However, these activities have great potential risks, and the frequent occurrence of security incidents poses a great threat to the safety of the city and the public. How to evacuate quickly and effectively has become an urgent problem to be solved. Studies have shown that during emergency, people show herd behavior during evacuation, and do not necessarily follow evacuation signs. In this paper, through simulated evacuation experiments, combined with eye movement technology, this paper studies the influence of the direction of evacuation signs and disturbing crowd on the validity of evacuation signs during the evacuation process. And the processing and analysis of the experimental data has certain reference significance for the related research on the validity of evacuation signs.
Key Technologies of Collaborative Target Detection between Self-propelled Anti-aircraft Weapons
Authors: Tianbao Ding , Chenxi Bao , Zhiwei Lin 
Published: June 2023

Abstract
In the case of a lack of target information, a self-propelled anti-aircraft weapon can complete its own combat functions by using the detection information of other vehicles through detection coordination technology. When using the detection coordination technology to process the detection information of other vehicles into information that can be used by the vehicle, the relative position and attitude of the vehicle and data transmission delay will affect the accuracy of the processed target information. With the system of detection collaborative technology expounded, emphasis is attached to the research on the detection coordination method based on pure angles without considering distance. A mathematical model of detection coordination technology is created, the approximate statistical law of the processed detection coordination information is obtained through the Monte Carlo method, and the influence of various factors on transmission error analyzed. In addition, the polynomial curve fitting method is used for time alignment, and the unscented Kalman filter method based on singular value decomposition adopted to reduce the information transfer error. The simulation results show the the method is effective for that end.
Thermal Analysis and Optimal Design of Artillery Integrated Electronic Case Based on FloEFD
Authors: Zhang Zhipeng , Li Zhong , Cui Haohao , Guo Jiachen , Liu Yanfeng 
Published: June 2023

Abstract
With the highly integrated artillery integrated electronic system, the power density in the integrated electronic chassis has risen sharply, and the temperature has also risen sharply. In order to solve the heat dissipation problem of the artillery integrated electronic case, this article firstly designs the artillery integrated electronic case according to the technical requirements, and uses heat density calculation and heat dissipation simulation technology to model and simulate the heat dissipation of the artillery integrated electronic case. According to the simulation results, conduct thermal analysis and optimization design of the chassis, and finally conduct a temperature test experiment with an infrared imager. The experimental results show that the heat dissipation simulation method can reflect the heat dissipation of the chassis more accurately and effectively, and lays a technical foundation for the application of temperature digital twin technology in the integrated electronic system of artillery.
Fatigue crack propagation in thick-walled pressure vessels under hydraulic testing condition
Authors: Wu B , Zheng J , Bai X L , Si D Y , Luo T F , Zou Z Q 
Published: June 2023

Abstract
Fatigue is one of the failure modes in gun barrel. It is still an important problem to understand crack propagation behavior due to fatigue loading of firing cycles. This paper presents a hydraulic fatigue test method to simulate crack propagation in a tube containing a pre-machined defect on its inner surface. A close inherent relation is found between crack propagating rate and hoop strain on the outside surface of the tube, which provides a feasible approach for investigation of fatigue behavior in gun barrel under actual firing condition.
Simulation Study on Jet Formation and Penetration Capability of Double-layer Cylinder-cone Shaped Charges with Different Outer Liner Materials
Authors: Wang Yifan , Wang Zhijun , Xu Yongjie 
Published: June 2023

Abstract
In order to discuss the effect of different outer liner material on the performance of the double cylinder-cone shaped charge, the nonlinear dynamics software Autodyn-2D was used to carry out numerical simulation, and the jet shape and penetration of steel target were analysed when copper, nickel, tungsten, tantalum and steel were used as outer liner materials and copper was used as inner cover material. The result shows that the jet head is formed by the cylindrical part of the inner liner, and all the outer liner forms a slug. The total length of the projectile is the longest when the outer liner material is copper. The jet head velocities are the biggest when the outer liner materials are nickel and steel 4340. The shaped charge with copper outer liner yields much longer depths.
Analysis of rain effects on millimeter wave fuze ground-echo characteristics
Authors: Yang Bing , Wu Kaiwei , Guo Zhe , Huang Zhonghua 
Published: June 2023

Abstract
Due to the wide antenna beam of the ground fuze and the similar size between the millimeter wave wavelength and raindrop particles, the ground millimeter wave fuze will suffer from serious rainfall interference in the rainfall environment, which greatly affects the accurate ranging performance of fuze. In this paper, we establish ground target echo signal model in the rain condition, and analyze the effects of target distance, rainfall and frequency on the ground millimeter wave fuze in rain. The results provide theoretical basis of anti-rain interference for millimeter wave fuze.
Research on Cooperative Strategy Guidance Based on Game Theory
Authors: Xin Wang , Xinghua Wang , Junjie Gong , Yao Lu 
Published: June 2023

Abstract
Multi-missile cooperative combat refers to the joint execution of the same combat task through the cooperation and cooperation between multiple same missiles or multiple different missiles. As the combat environment of the future battlefield becomes more and more complex, not only the precision guidance performance of the missile itself can be continuously improved, but also the cooperative operation of multiple missiles is needed to maximize the effectiveness of group combat. In this paper, the cooperative guidance strategy of multi-to-one interception problem will be studied again according to the game theory. According to the establishment of multi-to-one missile-target game model, the strategy set of missile and target is determined. Then according to the multi-to-one missile-target game model, the system equation is determined, and the cooperative guidance strategy is obtained by calculating the results. Finally, the simulation results are analyzed to further verify the effectiveness of the cooperative interception guidance law based on this method.
Simulation study on penetration depth of spherical fragments into concrete
Authors: Wang Zhening , Yin Jianping , Yi Jianya , Li Xudong 
Published: June 2023

Abstract
In order to study the influence of different spherical fragments on the penetration depth of concrete targets, AUTODYN-2D software is used to model and simulate the penetration of fragments with different diameters, materials and velocities. Through the analysis of penetration depth data, it is found that the penetration depth of tungsten alloy fragments will not continue to increase at higher speeds (when v > 1400 m / s, the penetration depth of tungsten alloy fragments begins to decrease). The process of spherical fragment penetrating concrete is analyzed, and the relationship between the penetration depth and the velocity, diameter, material parameters and concrete strength of spherical fragment is clarified. The simulation results show that the penetration depth curve parameters of different materials are quite different, due to the high utilization rate of tungsten alloy fragments, the calculation formula of penetration depth of tungsten alloy spherical fragments with respect to fragment parameters is obtained by fitting the penetration data. The penetration depth of tungsten alloy spherical fragments under different diameters and velocities can be predicted accurately by this formula.
Optimization design of cartridge adapter based on launch dynamics
Authors: Yunpeng Du , Zhaoyong Li , Ziqiang Wang , Zhiyong Zhao , Jing Zhang , Meijie Du , Yan Zhang , Liqiong Zhang 
Published: June 2023

Abstract
To study the influence of the cartridge adapter on the initial disturbance of the rocket shell launch, the dynamic simulation model of the interaction between the cartridge and the storage and distribution box during the rocket shell launch is established. With the aim of reducing the initial disturbance, the structure optimization and design parameters of the cartridge adapter are obtained fro m the dynamics simulation optimization analysis of rocket shell launch. The optimization results suggest that the number and layout of the cartridge adapter can greatly reduce the initial disturbance to launch and the optimization of cartridge adapter can greatly reduce the initial disturbance to rocket shell. The optimization method and results can provide reference for the design of rocket shell.
Review of Live-Virtual-Constructive Simulation Technology
Authors: Liang Yuxin , Wang Xiaoguang , Yue Tong , Xu Shuo , Yao Chuang , Liu Dongxing , Liu Qi 
Published: June 2023

Abstract
With the improvement of network communication technology, creative computer simulation architectures and today’s cutting-edge hardware, the live-virtual-constructive (LVC) simulation technology gradually matures adequately to synthesize joint heterogeneous systems. Firstly, the development of typical LVC architectures and their key technologies are analysed, such as Advanced Distributed Simulation (ADS), High-Level Architecture (HLA), Test and Train Enabling Architecture (TENA), Joint Simulation Supporting Platform (JoSim) and so force. Then, applications in the field of US and Chinese military are reviewed, as well as cases in air combat training and other scholarly research concept. Finally, a summary of LVC technology is given, and the development trend of military LVC simulation technology is predicted to explore the specific content that needs to be studied.
Study on Applicability of Phase Field Method in Quasi-Static Fracture Behavior Simulation of PBX Components
Authors: Yuan H W , Chen Y L , Tang W , Li Y X , Zhao L , Dong T B 
Published: June 2023

Abstract
Crack in polymer bonded explosive (PBX) components will influence the safety and reliability of weapon system. In order to accurately simulate the quasi-static fracture behavior of PBX components, the quasi-static arc Brazilian experiment of PBX explosive was carried out first. Then, the phase field method (PFM) and the traditional extended finite element method (XFEM) are used for the comparative simulation of the arc Brazil test process, in which both the maximum principal stress and the maximum principal strain initiation criterion are used in XFEM simulation. The calculation results show that the relative error of failure load calculated by PFM is small (less than 1%), while the error of XFEM calculation is large (the error of strain criterion and stress criterion are -61% and 42% respectively). Meanwhile, the fracture initiation locations calculated by PFM are located at 1/4 and 3/4 away from the end face of the Brazilian sample, which is in good agreement with the experimental results. In addition, PFM avoids the problems of crack mutation and discontinuity in XFEM. The results show that the PFM can accurately calculate the quasi-static fracture behavior of PBX components.
Simulation study of flushing ablation by gas-solid two phase flow of artillery barrel
Authors: Yan Lijun , Xu Yaofeng , Zhu Wenfang , Wang Daye , Xu Donghai 
Published: June 2023

Abstract
For the wear problem of artillery barrel bore during artillery launching, this work uses particle erosion and deposition modules in Fluent Software to simulate the erosion process of gunpowder gas particles on artillery barrel, analyses steady and transient states simulation results, and compares the effects of different influencing factors on barrel bore wear. The results showed that in a certain range, the erosion rate of barrel bore wall was positively correlated with particle velocity and mass flow. 0.25 mm was a critical particle size, and the erosion rate decreased with the increase of particle diameter. This information is valuable for prolonging the service life of artillery barrel.
Real-time signal processing method of ultra-wideband fuze using LSTM
Authors: Wu Ji , Liu Chunhua , Li Tie , Hao Shijun 
Published: June 2023

Abstract
The extraction of target features from the ultra-wideband (UWB) fuze echo signal and target recognition and distance determination are the key to controlling the precise detonation of the fuze. In this paper, a real-time signal processing method of UWB fuze based on Long Short-Term Memory (LSTM) network is proposed. The time domain and frequency domain features of echo signal are recognized through a small-scale LSTM network. Matlab is used to build the network model and simulation results show that the method can effectively avoid noise interference, correctly recognize the target signal, and avoid false alarm.
Study on microcharge design and output performance test
Authors: Yanlan Wang , Fang Zhang , Ruishan Han , Feipeng Lu , Shaoqun Li 
Published: June 2023

Abstract
Taking copper azide microcharge as research object, PVDF piezoelectric sensor was used to test the detonation pressure of copper azide microcharge and the detonation pressure of titanium flyer driven by copper azide microcharge explosion respectively. The effect of titanium flyers on the output performance of copper azide microcharge was investigated. The research results shown that: different microcharge structure parameters affected charge weight, and the charge weight directly affected the output pressure. The output pressure of copper azide microcharge to drive titanium flyer is much greater than the output pressure of copper azide microcharge. Titanium flyer driven by copper azide microcharge explosion, which could play the role of energy gathering and amplification.
Method and apparatus for automatic high-throughput synthesis of energetic salts
Authors: Wang Qiuxiao , Wang Tao , Zhou Yifei , Gao Haixiang 
Published: June 2023

Abstract
Energetic materials can instantly combust and release a large amount of energy in responding external impulses. Due to its energy characteristics, it has a wide range of practical applications: military and civilian. Designing high-energy-density materials with better performance, lower sensitivity, and more environmental friendliness has become a hotspot in the field of energetic materials in recent years. Energetic salts are formed by acid-base or metathesis reactions of different types of anions and cations. Energetic salts are a new class of energetic materials which were developed in recent years. Usually, they have high nitrogen content, high enthalpy of formation, high detonation performance, are relative stable to external stimuli, and have a wide range of application prospects in the fields of new explosives: low characteristic signal propellants, gas generators, low smoke or smokeless pyrotechnics. The synthesis method of energetic salts is simple, and the types of energetic materials are greatly enriched. This research takes energetic salts as the synthesis target and adopts multi-channel automation technology for high-throughput synthesis, which can improve the efficiency, reduce labor costs, and greatly increase the synthesis speed, which is of great significance for accelerating the synthesis of new energetic salts.
The Influence of Propellant Deterrent Concentration Profile on Combustion Performance
Authors: Gou Yong-liang , Li Zi-chao , Bian Xiao-yu , Tian De-qing , Lv Hao , Wang Jia-peng 
Published: June 2023

Abstract
This paper builds a theoretical model concerning the influence of deterrent concentration profiles on the combustion performance of spherical propellants and identifies the effects of deterrent diffusion depth (A) and combined strength of deterring (P) on propellant Γ~Ψ curves. In addition, a calculation method for quantitatively comparing the combustion progressivity of Γ~Ψ curves is presented. The results show that the percentage of the propellant burned corresponding to the maximum gas generation intensity Ψmax has a good linear relationship with both the parameters P and A, with a correlation coefficient of 0.986 and 0.982, respectively. The progressivity index is non-linearly associated with deterrent diffusion depth A, but linearly associated with the combined strength of deterring P.
Effect of CuO powder on the combustion and micro-explosion of Mg and Al12Mg17 particles
Authors: Xie Xiao , Zhang Yan , Hua Jian , Jian Chang 
Published: June 2023

Abstract
In this paper, the effects of CuO powder on the combustion and micro-explosion characteristics of Mg and Al12Mg17 were studied. A laser was used to ignite particles and a high-speed micro-camera was used to record the particle ignition, flame propagation, combustion and particle changes before and after micro-explosion. Moreover, emission spectra during combustion and combustion products were analysed. The results show that the addition of CuO contributes to the micro-explosion of Mg particles during combustion, but it is not conducive to the micro-explosion of Al12Mg17 particles. Meanwhile, whether Al12Mg17 particles or Al12Mg17/CuO particles, the radiation peaks during combustion mainly correspond to Mg or MgO, which means that the addition of CuO cannot promote the gas phase combustion of Al in Al12Mg17.