bluuebunny/crossref_metadata_2025_split huggingface dataset:
Damage effectiveness evaluation of a certain type of submarine
Authors: Hao Li , Wenbin Li 
Published: December 2024

Abstract
In order to evaluate the damage effectiveness of a certain type of submarine, through the analysis of the vulnerability of the target and the calculation of the explosive power field, the damage effectiveness evaluation platform of the submarine is built, and the missile-target rendezvous parameters are set up, and different schemes are established, the damage effectiveness evaluation of the submarine model is completed. The results show that the damage effect of torpedo is the best among different parts of submarine, the damage probability of heavy torpedo is 97.51%, and that of light torpedo is 91.18%.
Study on the Effects of Multiple Macroscopic Deviations Coupling on the Jet Formation Performance of Shaped Charges
Authors: Xu Hengwei , Lu Zhengcao , Liang Bin , Lu Yonggang 
Published: December 2024

Abstract
To improve the penetration stability of shaped charges, this study investigates the influence of three common types of macroscopic manufacturing deviations—off-centre initiation, liner offset, and liner deflection—on the jet formation performance of shaped charges. The study employs variance analysis to elucidate the relative significance of each macroscopic deviation. The findings indicate that off-centre initiation causes the jet to deflect while maintaining a linear shape, whereas liner offset and deflection deviations result in jet bending. When multiple macroscopic deviations are coupled, the degree of jet bending approximates the vector sum of the bending induced by individual deviations.
Theoretical Study on Impact Compression Behavior and Reaction Characteristics of Reactive Materials
Authors: Du Ning , Song Xiaoyu , Sun Yinglue , Guo Qiuping , Dong Xing , Huang Weiping 
Published: December 2024

Abstract
Reactive Materials (RMs) is usually inert at normal temperature and pressure, but when it is subjected to enough impact energy, it can be rapidly transformed into a high-temperature and high-pressure environment, which triggers a chemical reaction and releases a large amount of energy. In order to study the impact compression behavior and reaction characteristics of RMs, this paper established a typical Al/PTFE RMs impact reactivity calculation equation based on the Arrhenius reaction rate model and combined with Avrami-Erofeev’s n-dimensional nuclear/growth control reaction model. And theoretical calculations were conducted on the impact response and reaction characteristics of typical Al/PTFE RMs. The reliability of the model was verified by comparing the calculated results with the simulation results. At the same time, the propagation process of shock wave pressure peak under explosive load in RMs was numerically simulated using software, and the propagation law was studied. The results showed that the impact pressure had a significant impact on the energy release characteristics of typical Al/PTFE active materials. The calculation results of the critical reaction threshold for impact are in good agreement with the simulation results, indicating the reliability of the model. The size of the explosive charge remained unchanged, and as the propagation distance of the shock wave increases, the peak pressure of the shock wave attenuated slowly in the Al/PTFE RMs. During the explosive loading process, the Al/PTFE RMs did not undergo complete chemical reactions, and only a portion of the RMs underwent chemical reactions.
Mesoscale simulation study on formation of reactive double-layered liner
Authors: Qiu Wenhao , Zheng Yuanfeng 
Published: December 2024

Abstract
A mesoscale numerical simulation model of double-layered liner with reactive material and copper is established by means of mesoscale numerical simulation method. The mesoscale morphology, velocity characteristics and the force-thermal coupling characteristics of reactive material during the formation process are studied by simulating the double-layered liner with typical structure. Six kinds of double-layered liner with different liner thickness ratios are simulated to study the influence of liner thickness relationship on formation. The main results are as follows: The slug is almost completely formed by the reactive outer layer liner, and the jet head is completely formed by the inner liner. The slug speed is about 450m/s, the jet head speed is about 5000m/s, PTFE and Al material speed is basically the same, there is no velocity gradient; The pressure and temperature of reactive outer layer liner are positively correlated. The impact temperature rise of reactive material is low due to the wave impedance characteristics of double-layered liner, which may lead to a low degree of activation. In addition, the jet length and head velocity decrease with the increase of total liner thickness. The liner thickness is increased from 1mm/3mm to 2mm/5mm, the jet length is shortened by 20%, and the head speed is reduced by 15%; At the same time, the thickness of copper inner layer liner has a greater influence on the jet length, and too thick liner will have a negative effect on the pressure and temperature of the jet.
Numerical simulation of ballistic protection performance of circular and hexagonal perforated high nitrogen steel
Authors: Shi Anshun , Hong Xiaowen , Xia Kailang , Sun Sujie , Fan Xuefei , Qin Chao , Zhao Hongyuan , Han Hongwei , Ge Yuanyuan 
Published: December 2024

Abstract
The ballistic performance of high nitrogen austenitic stainless steel (HNASS) plates with round and hexagonal perforations was numerically simulated by LS-DYNA software. A systematic analysis was conducted to explore the effects of pore size, hole spacing, impact point, and other variables on the material’s ballistic resistance. It indicate that the failure mechanism of the bullet core penetrating the perforated HNASS plate is dependent on the specific impact point. Additionally, circular perforated plates exhibit superior crack arrest capabilities compared to hexagonal perforated plates. When the width of the steel plate between adjacent holes exceeds the hole radius, there is an increase in core mass loss, both at the center of the hole and at the impact point between two holes. The deflection angle of the bullet core is significantly affected by the impact point, particularly when the width of the steel plate between holes is greater than the hole radius, with a maximum deflection angle of approximately 20°. Factors such as the hole diameter of the perforated plate, the width of the steel plate between holes, and the shape of the perforations all influence the residual velocity of the bullet core. Generally, smaller hole diameters, wider steel plates between holes, and hexagonal perforations result in lower residual velocities of the bullet core. Notably, the hexagonal perforated plates demonstrate a lower residual velocity compared to circular perforated plates, with a maximum average velocity drop that is 43.8% higher. The findings can serve as valuable references for designing additional armor for light armored vehicles.
Initial velocity circumferential distribution model of Multi-layer spherical premade fragments
Authors: Qifei Meng , Jianbing Men , Yuxiang Nan , Shiyu Liu 
Published: December 2024

Abstract
To calculate the force field of multi-layer spherical premade fragment warheads, a calculation model for the initial velocity of multi-layer spherical fragments is constructed. Based on the scattering process of multi-layered spherical fragments under explosive loading, the fragment driving process is divided into three stages: common motion, filler penetration, and fragment delamination. A multi-layer spherical fragment circumferential initial velocity calculation model was constructed by combining the Stanovich model and Gurney model, using the momentum theorem and energy conservation law. Conducting numerical simulations and pulse X-ray verification experiments on the explosive loading of fragment warheads under different levels of fragment layers, the numerical simulation and experimental results show that when the number of fragment layers is less than 4, the average velocity of each layer calculated by the model has an average error of less than 15% compared to the simulation and experiment, which can basically achieve prediction of the initial velocity and distribution of premade fragments scattered along the circumferential direction in each layer.
Capacitor cell with boosted switching-on
Authors: Enikeev R , Fridman B , Korkunov A , Sapozhnikov K , Tomashevich P , Vasil’ev A , Popkov D 
Published: December 2024

Abstract
The paper presents the results of the development and experiments of a capacitor cell with stored energy up to 121.875 kJ with boosted switching-on, designed to operate at voltages up to 50 kV and a maximum discharge current amplitude of up to 500 kA. The cell has two circuits. The “fast” circuit, switched using a pseudo-spark switch, provides the initial boosted switching-on and increase in voltage in the load, and the main “slow” circuit, switched using trigger vacuum switches, ensures a subsequent increase in the current to the required value.
Combustion enhancement and control of modular charge by electrothermal plasma
Authors: Yang Xuqing , Wang Zhangfei , Liu Jian , Li Baoming 
Published: December 2024

Abstract
Uni-modular charge has the advantages of easy automatic loading, fast loading speed, high safety and easy logistics support, which is the best choice for large calibre artillery charge. For uni-modular charge, the small number modular charge has some problems, such as ignition inequality, propellant combustion instability, and easy residue, which results in chamber pressure surge and low firing accuracy. Electrothermal plasma has the advantages of high temperature, high heat enthalpy and fast chamber diffusion, which is a feasible way to solve the problem of modular charge combustion. The key technologies such as plasma generator and high-power breech transmission have been studied, and the large calibre modular charge electrothermal chemical launch system has been established. Electrothermal chemical launch test was conducted. It is verified that electrothermal plasma can significantly enhance the firing performance of the small number modular charge.
Research on transmission line capture algorithm based on AI ISP
Authors: Li Mingyue , Cui Wenpeng , Tian Zhizhong , Yang Bokuan , Yang Qingchen , Chen Yuzhe 
Published: December 2024

Abstract
Routine power inspection is crucial for the safe operation of the power system, and unmanned aerial vehicle (UAV) inspection methods are commonly used for power inspection. However, there are still challenges in improving the quality of captured videos and images during UAV inspection. More and more researchers are introducing AI ISP methods to improve the image quality of transmission lines in harsh scenarios such as night, foggy, and rainy days. This article designs a dual-branch model based on AI ISP technology, which takes Raw data and HVI spatial data as inputs, extracts their respective features, and fuses them as outputs. The model is experimentally compared on multiple public datasets and validated on the self-made transmission line inspection data in this article. This article achieved SOTA performance on the aforementioned datasets.
Optimal energy storage configuration method for offshore oil and gas field with wind power integrated
Authors: Yue Jingpeng , Zhang Zihan , Liang Xiaobing , Liu Longfei , Liu Jing , Liu Yuhan , Xu Xiandong 
Published: December 2024

Abstract
The joint development of offshore oil and gas fields (OOGF) and offshore wind power has become a potential trend. Yet, how to smooth the fluctuation of wind power without the support of the main grid is still not well studied. To address this issue, this paper proposes an optimal energy storage configuration method for OOGF considering the operational security and space limit of the OOGF platforms. Firstly, the energy balance and inertia requirements of OOGF are analyzed. Secondly, the energy storage configuration is formulated as an optimization problem with frequency regulation and energy balance as constraints. Thirdly, an iterative method is proposed to solve the optimization problem. The proposed method is tested by using real data from an OOGF platform. The results show that the platform operating cost and the expected load-shedding loss under contingency are significantly decreased.
Identification of local thermal aging defects in power cables based on frequency domain reflection coefficient spectroscopy method
Authors: Cheng Dengfeng , Wei Jinhui , Huang Fengbiao , Wu Qiong , Tao Xuefeng , Wu Kai , Li Qiang , Xue Jianyi 
Published: December 2024

Abstract
This paper is based on the frequency domain reflection method to measure the reflection coefficient spectrum at the first end of the cable. A vector network analyzer is used to obtain the logarithmic amplitude and phase spectra of normal cables and locally thermally aged cables. By comparing the reflection coefficient spectra of cables before and after the fault, the typical characteristics of localized cable aging are obtained. The test results show that with the increase of local thermal aging time, the logarithmic amplitude shows a decreasing trend between the frequencies of 10 MHz and 100 MHz. The phase diagram of the locally thermally aged cable shows that the number of positive peaks of the waveform is smaller than that of the normal cable between the frequencies of 10 MHz and 100 MHz. And the waveform period increases. The results can provide a reference for the detection and identification of local thermal aging defects in cables.
Identification of localized moisture defects in power cables based on frequency domain reflection coefficient spectra method
Authors: Cheng Dengfeng , Wei Jinhui , Huang Fengbiao , Wu Qiong , Tao Xuefeng , Wu Kai , Li Qiang , Xue Jianyi 
Published: December 2024

Abstract
Based on the frequency domain reflection method, this paper studies the reflection coefficient spectrum characteristics of the head-end of the cable. The vector network analyzer is used to obtain the logarithmic amplitude, linear amplitude, and phase spectrum of the normal cable and the local heat aging cable. By comparing the reflection coefficient spectrum of the cable with/without the fault, the typical characteristics of the cable with local dampness defect are obtained. The experimental results show that: within 1 MHz-100 MHz, the logarithmic amplitude and linear amplitude of the reflection coefficient spectrum increase with the time of dampness. The frequency and amplitude of the first trough show a decreasing trend. The number of positive peaks of the phase waveform of the damped cable is smaller than the normal cable. The test results show that: within 1 MHz-100 MHz, the logarithmic amplitude and linear amplitude increase with the increase of the moisture time. The frequency and amplitude of the first trough of the reflection coefficient spectrum of the logarithmic amplitude and linear amplitude show a decreasing trend. The number of positive peaks in the phase waveform of the cable after the moisture is less than that of the normal cable, and the period of the waveform becomes larger. The results can provide a reference for the detection and identification of localized moisture defects in cables.
Indoor space segmentation method based on the gated attention unit
Authors: Fan Huanhuan 
Published: December 2024

Abstract
Accurate 3D scene understanding is a challenging task. With the rapid development of 3D sensor technology, the acquisition and processing of 3D data determine the improvement of scene understanding capabilities. Our paper studies a point cloud semantic segmentation technology based on the Gated Attention Unit (GAU), which integrates the self-attention mechanism and attention pooling through the gated unit structure, thereby obtaining feature representation with long-range dependency information and improving the semantic segmentation effect. Finally, our network achieved 64.6% mIoU and 88.7% OA on S3DIS.
Research on resonance control strategy based on electro-hydraulic servo excitation
Authors: Yang Xiuguang , Liu Peng , Zhao Hongwei , Sun Jian , Du Yanzhe , Han Ming , Zhao Anran 
Published: December 2024

Abstract
For the large tonnage high-frequency resonance fatigue test loading requirements, an electro-hydraulic servo resonance control strategy is proposed. The electro-hydraulic servo resonance structure and control system principle are analyzed. The electro-hydraulic servo resonance control system is based on the functions of sinusoidal vibration signal sweeping, signal decomposition, alternating load loading, mean-value load loading, etc. The electro-hydraulic servo system circuit design functions are verified by using simulation and analysis methods. The proposed technology realizes the electro-hydraulic servo resonant loading requirements, broadens the fatigue test loading capacity, and provides a theoretical basis for the research and development of the control system of large tonnage high-frequency loud fatigue test device.
Research on small target detection in multispectral remote sensing images based on multimodal deep learning
Authors: Li Zongzhe , Wang Qicheng , Zhao Zhen 
Published: December 2024

Abstract
Multispectral remote sensing images contain many small targets, occupy few pixels, have blurred details, and are easily interfered with by background noise, becoming a major problem in the target detection task. The target detection approach employing multimodal deep learning leverages multispectral remote sensing images to gather information from multiple spectral bands. This enables the model to capture a more comprehensive representation of the targets and improves the problem of missing details in single-modal images by data fusion, which is widely used in small target detection research. This paper uses the SuperYOLO algorithm with assisted super-resolution learning to fuse multispectral remote sensing data and detect and identify small-sized targets. The experimental results demonstrate that while maintaining detection accuracy and computational efficiency, the capability for small target detection using multispectral remote sensing images is significantly improved.
Investigation of Structural and Thermal Analysis of Drone Propeller Materials
Authors: Tiruvenkadam Dr.N. , Gowri Shankar S. , Mahes Kumar P. , Gowtham S. 
Published: December 2024

Abstract
Drones, also known as unmanned aerial vehicles (UAVs), have become an Irreplaceable part of modern-day society. They are used for various operations such as delivery, surveillance, defense, and rescue. One of the most important parts of the drone that lifts, thrusts or balances the drone is its propeller. The weight of the drone is one of the important aspects that affects the efficiency of the drone, and the variation in speed may damage the drone propeller, or harsh environmental changes also affect the propeller. So, the material used must be able to withstand these effects such as carbon fiber, and nylon. The various material is analyzed using the ANSYS software to identify the structural and thermal properties of drone propellers at various speeds to identify the most satisfactory material for drone propellers. The result is verified by Ashby method of material selection. The experimental value is validated using the statistical analysis using python programming. As a result, carbon fiber is proven to be the most suitable material for high-speed drone propeller than the nylon.
Enhancing Industrial Safety Helmets: Development and Evaluation of Epoxy-Based Glass and Basalt Fiber Composites
Authors: Raja Pandi R , Bihari Bagesh , Chokkalingam P , Karthikeyan R , Anand R , Kalaiarasan S , Sivalingam A 
Published: December 2024

Abstract
Employing personal protective equipment, including helmets for safety, at industrial sites is the ultimate step in averting disasters, and such equipment is commonly recognized the disposable items. Industrial safety helmets employ Polypropylene Terephthalate (PET) or polypropylene (PP) resins is the primary material for shell to efficiently absorb impacts. Additionally, they exhibit a commendable level of heat resistance. Nevertheless, there is currently a lack of active initiatives to develop novel materials using a straightforward fabrication approach. The objective of this work was to enhance safety behaviour of industrial helmets by using epoxy resin as the matrix to develop composite material consisting of glass fiber and basalt fiber in a direct cross-ply arrangement. Subsequently, the performance of this composite material was evaluated in relation to glass and basalt composites, and PET plastic. The samples are produced through compression molding method. The tensile strength (TS), flexural strength (FS), impact strength (IS), and inter laminar shear strength (ILSS), and their heat resistance capabilities are assessed using thermo gravimetric analysis (TGA). The impact energy absorptions of BFRP, BF/GFRP, and GFRP were 6.3, 6.1, and 5.2 times higher than that of PET plastic correspondingly. Superior heat resistance was demonstrated by specimens built of Basalt Fiber Reinforced Polymer (BFRP) and Basalt Fiber/Glass Fiber Reinforced Polymer (BF/GFRP), as compared to the other scenarios. For instance, when compared to PET plastic, BFRP was 24.9 times stronger while BF/GFRP was 12.7 times stronger. The outcomes of this research work are showed that the basalt and glass fiber reinforced composites (BF/GFRP) exhibit the superior impact energy absorption than PET plastic.
Development and characterization of Fe-30Cu-10Si-6W-10Mo superalloy with enhanced γ′ phase stability and oxidation resistance using CALPHAD method
Authors: Suresh Kumar K , Mohanraj K , Raja Muhammadu Sathik , Arul M , Hussain Beporam Iftekhar , Nanthakumar S , Devarajan R 
Published: December 2024

Abstract
The objective of the study was to develop an alloy with a significant proportion of the γ′ phase and solvus, together with an optimal thermal processing range, by employing the CALPHAD (Calculation of Phase Diagrams) approach. The alloy composition employed consisted of iron (Fe), copper (Cu), silicon (Si), tungsten (W), and molybdenum (Mo) in the proportions of 30 %, 10 %, 10 %, 6 %, and 10 % respectively. The actual results validated the calculations and showed that Mo is a constituent that forms the γ phase in Fe-Cu-Si-W-based alloys. Molybdenum (Mo) is added to the alloy to mitigate the discrepancy in lattice structure, impede the formation of bigger particles, and lower the overall density of the alloy. The inclusion of a precise amount of Mo led to the formation of a superalloy that demonstrates a combination of superior mechanical performance at the γ′ solvus and a reduced density. Furthermore, the incorporation of Mo can greatly improve the ability of the Fe-Cu-Si-W high-temperature alloy to resist oxidation. At a temperature of 1000°C, the Fe-30Cu-10Si-6W-10Mo alloy showed minimal weight gain from oxidation, demonstrating its outstanding resistance to oxidation. The primary cause of this phenomenon is the formation of continuous layers of (Fe, Cu) (Si, Mo)2O4 spinel oxide after prolonged oxidation.