Defence Technology(防务技术)最新文献_第2页

Dynamics and experiments of a tendon-actuated flexible robotic arm for capturing a floating target 肌腱驱动柔性机械臂捕获漂浮目标的动力学与实验

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.12.013

Xin Xia , Yunpeng Sun , Jialiang Sun

引用次数: 0

Experimental investigation on dynamic stab resistance of high-performance multi-layer textile materials 高性能多层纺织材料动态抗刺伤性能的实验研究

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2025.01.010

Mulat Alubel Abtew , François Boussu , Irina Cristian , Bekinew Kitaw Dejene

{"title":"Experimental investigation on dynamic stab resistance of high-performance multi-layer textile materials","authors":"Mulat Alubel Abtew , François Boussu , Irina Cristian , Bekinew Kitaw Dejene","doi":"10.1016/j.dt.2025.01.010","DOIUrl":"10.1016/j.dt.2025.01.010","url":null,"abstract":"<div><div>Stab-resistant textiles play a critical role in personal protection, necessitating a deeper understanding of how structural and layering factors influence their performance. The current study experimentally examines the effects of textile structure, layering, and ply orientation on the stab resistance of multi-layer textiles. Three 3D warp interlock (3DWI) structures ({f1}, {f2}, {f3}) and a 2D woven fabric ({f4}), all made of high-performance p-aramid yarns, were engineered and manufactured. Multi-layer specimens were prepared and subjected to drop-weight stabbing tests following HOSBD standards. Stabbing performance metrics, including Depth of Trauma (DoT), Depth of Penetration (DoP), and trauma deformation (<em>Y</em><sub>max</sub>, <em>X</em><sub>max</sub>), were investigated and analyzed. Statistical analyses (Two- and One-Way ANOVA) indicated that fabric type and layer number significantly impacted DoP (<em>P</em> < 0.05), while ply orientation significantly affected DoP (<em>P</em> < 0.05) but not DoT (<em>P</em> > 0.05). Further detailed analysis revealed that 2D woven fabrics exhibited greater trauma deformation than 3D WIF structures. Increasing the number of layers reduced both DoP and DoT across all fabric structures, with f3 demonstrating the best performance in multi-layer configurations. Aligned ply orientations also enhanced stab resistance, underscoring the importance of alignment in dissipating impact energy.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 1-14"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of adhesive layer properties on ceramic multi-layered ballistic armour systems: A review 粘接层性能对陶瓷多层弹道装甲系统的影响

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.11.008

Ethan I.L. Jull, Richard Dekker, Lucas Amaral

引用次数: 0

Research on multi-scale simulation and dynamic verification of high dynamic MEMS components in additive manufacturing 增材制造中高动态MEMS元件多尺度仿真与动态验证研究

IF 5

Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.12.019

Sining Lv, Hengzhen Feng, Wenzhong Lou, Chuan Xiao, Shiyi Li

{"title":"Research on multi-scale simulation and dynamic verification of high dynamic MEMS components in additive manufacturing","authors":"Sining Lv, Hengzhen Feng, Wenzhong Lou, Chuan Xiao, Shiyi Li","doi":"10.1016/j.dt.2024.12.019","DOIUrl":"10.1016/j.dt.2024.12.019","url":null,"abstract":"<div><div>Metal Additive Manufacturing (MAM) technology has become an important means of rapid prototyping precision manufacturing of special high dynamic heterogeneous complex parts. In response to the micro-mechanical defects such as porosity issues, significant deformation, surface cracks, and challenging control of surface morphology encountered during the selective laser melting (SLM) additive manufacturing (AM) process of specialized Micro Electromechanical System (MEMS) components, multi-parameter optimization and micro powder melt pool/macro-scale mechanical properties control simulation of specialized components are conducted. The optimal parameters obtained through high-precision preparation and machining of components and static/high dynamic verification are: laser power of 110 W, laser speed of 600 mm/s, laser diameter of 75 μm, and scanning spacing of 50 μm. The density of the subordinate components under this reference can reach 99.15%, the surface hardness can reach 51.9 HRA, the yield strength can reach 550 MPa, the maximum machining error of the components is 4.73%, and the average surface roughness is 0.45 μm. Through dynamic hammering and high dynamic firing verification, SLM components meet the requirements for overload resistance. The results have proven that MEM technology can provide a new means for the processing of MEMS components applied in high dynamic environments. The parameters obtained in the conclusion can provide a design basis for the additive preparation of MEMS components.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 275-291"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonlinear asymmetric thermomechanical buckling of shallow nanoscale arches having dissimilar end conditions embracing nonlocality and strain gradient size dependencies 具有非局域性和应变梯度尺寸依赖关系的不同端部条件的纳米浅拱桥的非线性非对称热力学屈曲

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2025.01.005

Saeid Sahmani , Kamila Kotrasova , Mona Zareichian , Jian Sun , Babak Safaei

{"title":"Nonlinear asymmetric thermomechanical buckling of shallow nanoscale arches having dissimilar end conditions embracing nonlocality and strain gradient size dependencies","authors":"Saeid Sahmani , Kamila Kotrasova , Mona Zareichian , Jian Sun , Babak Safaei","doi":"10.1016/j.dt.2025.01.005","DOIUrl":"10.1016/j.dt.2025.01.005","url":null,"abstract":"<div><div>The undercurrent research survey explores the roles of nonlocality and strain gradient size dependencies in nonlinear asymmetric buckling of shallow nanoscale arches having dissimilar end conditions through a numerical analysis. The arches, made from a functionally graded graphene nanofiller reinforced composite (FG-GNRC), are subjected to discretional radial concentrated loads along with converting of temperature. To account for the size dependencies, the exploration is carried out stemming from the nonlocal strain gradient theory (NSGT) in the sense of a quasi-2D parabolic shear flexible concept of curved beam. The material properties of the contemplated FG-GNRC sandwich are determined using the modified Halpin-Tsai micromechanics model. Subsequently, an extended isogeometric analysis (XIGA) is manipulated comprising insertion plus multiplication of knots to achieve the demanded lower continuity allocated to the integration between flexural and tangential reflexes. It is perceived that the both softening and stiffening concomitants assigned to the salient concentrated radial loads obtained by the developed NSGT-based XIGA diminish from the first upper limit to the second one, and then likewise from the first lower limit to the second one. Although, by becoming the upsurge in temperature higher, these softening and stiffening concomitants get more remarkable.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 67-82"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiple fixed-wing UAVs collaborative coverage 3D path planning method for complex areas 多固定翼无人机协同覆盖复杂区域三维路径规划方法

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2025.01.008

Mengyang Wang, Dong Zhang, Chaoyue Li, Zhaohua Zhang

{"title":"Multiple fixed-wing UAVs collaborative coverage 3D path planning method for complex areas","authors":"Mengyang Wang, Dong Zhang, Chaoyue Li, Zhaohua Zhang","doi":"10.1016/j.dt.2025.01.008","DOIUrl":"10.1016/j.dt.2025.01.008","url":null,"abstract":"<div><div>Complex multi-area collaborative coverage path planning in dynamic environments poses a significant challenge for multi-fixed-wing UAVs (multi-UAV). This study establishes a comprehensive framework that incorporates UAV capabilities, terrain, complex areas, and mission dynamics. A novel dynamic collaborative path planning algorithm is introduced, designed to ensure complete coverage of designated areas. This algorithm meticulously optimizes the operation, entry, and transition paths for each UAV, while also establishing evaluation metrics to refine coverage sequences for each area. Additionally, a three-dimensional path is computed utilizing an altitude descent method, effectively integrating two-dimensional coverage paths with altitude constraints. The efficacy of the proposed approach is validated through digital simulations and mixed-reality semi-physical experiments across a variety of dynamic scenarios, including both single-area and multi-area coverage by multi-UAV. Results show that the coverage paths generated by this method significantly reduce both computation time and path length, providing a reliable solution for dynamic multi-UAV mission planning in semi-physical environments.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 197-215"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Controlling update distance and enhancing fair trainable prototypes in federated learning under data and model heterogeneity 数据和模型异构条件下联邦学习中更新距离控制与可训练公平原型的增强

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.12.024

Kangning Yin , Zhen Ding , Xinhui Ji , Zhiguo Wang

{"title":"Controlling update distance and enhancing fair trainable prototypes in federated learning under data and model heterogeneity","authors":"Kangning Yin , Zhen Ding , Xinhui Ji , Zhiguo Wang","doi":"10.1016/j.dt.2024.12.024","DOIUrl":"10.1016/j.dt.2024.12.024","url":null,"abstract":"<div><div>Heterogeneous federated learning (HtFL) has gained significant attention due to its ability to accommodate diverse models and data from distributed combat units. The prototype-based HtFL methods were proposed to reduce the high communication cost of transmitting model parameters. These methods allow for the sharing of only class representatives between heterogeneous clients while maintaining privacy. However, existing prototype learning approaches fail to take the data distribution of clients into consideration, which results in suboptimal global prototype learning and insufficient client model personalization capabilities. To address these issues, we propose a fair trainable prototype federated learning (FedFTP) algorithm, which employs a fair sampling training prototype (FSTP) mechanism and a hyperbolic space constraints (HSC) mechanism to enhance the fairness and effectiveness of prototype learning on the server in heterogeneous environments. Furthermore, a local prototype stable update (LPSU) mechanism is proposed as a means of maintaining personalization while promoting global consistency, based on contrastive learning. Comprehensive experimental results demonstrate that FedFTP achieves state-of-the-art performance in HtFL scenarios.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 15-31"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study, development and related application of a miniature compact pulsed power supply with high repetition frequency 高重复频率微型紧凑脉冲电源的研究、开发及相关应用

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2025.01.004

Zhangfei Wang , Jian Liu , Chunxia Yang, Baoming Li

{"title":"Study, development and related application of a miniature compact pulsed power supply with high repetition frequency","authors":"Zhangfei Wang , Jian Liu , Chunxia Yang, Baoming Li","doi":"10.1016/j.dt.2025.01.004","DOIUrl":"10.1016/j.dt.2025.01.004","url":null,"abstract":"<div><div>Capacitor-based pulsed power supply (PPS) is widely used in fields related to electromagnetic launch, plasma, and materials' synthesis, modification and processing. As industrial applications place higher requirements on compact and portable pulsed power supplies, the National Key Laboratory of Transient Physics (NKLTP) recently developed a pulsed power supply consisting of a set of compact pulse-forming units (PFU), each with a capacitor energy storage of 220 kJ. This integrated PPS comes with a complete system configuration, a miniature compact structure, a high rate of repetition, and high power, with energy storage density exceeding 1.2 MJ/m<sup>3</sup>. This paper describes the device-level design of the unit, the system layout, the control system, the thermal management system, and the experimental results of the pulsed power supply. The experimental results verified the good reliability of the PPS at high repetition rates with each unit module delivering an output current of more than 100 kA. Additionally, flexible current pulse shapes can be formed by setting the charging voltage and the trigger sequence of the PFUs. The pulse forming network (PFN) developed from these PFUs was successfully applied to electromagnetic launch.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 304-318"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on equation of state parameters for high-energy solid propellants based on improved cylinder test and particle swarm optimization 基于改进圆筒试验和粒子群优化的高能固体推进剂状态参数方程研究

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.12.001

Songlin Pang, Xiong Chen, Jinsheng Xu, Zongtao Guo, Xinyu Cao

引用次数: 0

Experimental and numerical investigation of cavity characteristics in behind-armor liquid-filled containers under shaped charge jet impact 聚能射流冲击下装甲后充液容器空腔特性的实验与数值研究

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.12.021

Shixin Ma, Xiangdong Li, Lanwei Zhou

{"title":"Experimental and numerical investigation of cavity characteristics in behind-armor liquid-filled containers under shaped charge jet impact","authors":"Shixin Ma, Xiangdong Li, Lanwei Zhou","doi":"10.1016/j.dt.2024.12.021","DOIUrl":"10.1016/j.dt.2024.12.021","url":null,"abstract":"<div><div>The cavity characteristics in liquid-filled containers caused by high-velocity impacts represent an important area of research in hydrodynamic ram phenomena. The dynamic expansion of the cavity induces liquid pressure variations, potentially causing catastrophic damage to the container. Current studies mainly focus on non-deforming projectiles, such as fragments, with limited exploration of shaped charge jets. In this paper, a uniquely experimental system was designed to record cavity profiles in behind-armor liquid-filled containers subjected to shaped charge jet impacts. The impact process was then numerically reproduced using the explicit simulation program ANSYS LS-DYNA with the Structured Arbitrary Lagrangian-Eulerian (S-ALE) solver. The formation mechanism, along with the dimensional and shape evolution of the cavity was investigated. Additionally, the influence of the impact kinetic energy of the jet on the cavity characteristics was analyzed. The findings reveal that the cavity profile exhibits a conical shape, primarily driven by direct jet impact and inertial effects. The expansion rates of both cavity length and maximum radius increase with jet impact kinetic energy. When the impact kinetic energy is reduced to 28.2 kJ or below, the length-to-diameter ratio of the cavity ultimately stabilizes at approximately 7.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 242-259"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0