Defence Technology(防务技术)最新文献

A general viscoelastic foundation model for vibration analysis of functionally graded sandwich plate with auxetic core 一种功能梯度夹层板减振分析的通用粘弹性基础模型

IF 5

Defence Technology(防务技术) Pub Date : 2025-04-01 DOI: 10.1016/j.dt.2024.12.008

Mofareh Hassan Ghazwani , Ali Alnujaie , Pham Van Vinh

{"title":"A general viscoelastic foundation model for vibration analysis of functionally graded sandwich plate with auxetic core","authors":"Mofareh Hassan Ghazwani , Ali Alnujaie , Pham Van Vinh","doi":"10.1016/j.dt.2024.12.008","DOIUrl":"10.1016/j.dt.2024.12.008","url":null,"abstract":"<div><div>This study presents a significant advancement in the vibration analysis of functionally graded sandwich plates with auxetic cores by introducing a general viscoelastic foundation model that more accurately reflects the complex interactions between the plate and the foundation. The novelty of this study is that the proposed viscoelastic foundation model incorporates elastic and damping effects in both the Winkler and Pasternak layers. To develop the theoretical framework for this analysis, the higher-order shear deformation theory is employed, while Hamilton's principle is used to derive the governing equations of motion. The closed-form solution is used to determine the damped vibration behaviors of the sandwich plates. The precision and robustness of the proposed mathematical model are validated through several comparison studies with existing numerical results. A detailed parametric study is conducted to investigate the influence of various parameters, including the elastic and damping coefficients of the foundation, the material gradation, and the properties of the auxetic core on the vibration behavior of the plates. The numerical results provide new insights into the vibration characteristics of sandwich plates with auxetic cores resting on viscoelastic foundation, highlighting the significant role of the two damping coefficients and auxetic cores in the visco-vibration behavior of the plates.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"46 ","pages":"Pages 40-58"},"PeriodicalIF":5.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829972","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

Comparative study on the oblique water-entry of high-speed projectile based on rigid-body and elastic-plastic body model 基于刚体和弹塑性模型的高速弹丸斜入水比较研究

IF 5

Defence Technology(防务技术) Pub Date : 2025-04-01 DOI: 10.1016/j.dt.2024.11.007

Xiangyan Liu , Xiaowei Cai , Zhengui Huang , Yu Hou , Jian Qin , Zhihua Chen

{"title":"Comparative study on the oblique water-entry of high-speed projectile based on rigid-body and elastic-plastic body model","authors":"Xiangyan Liu , Xiaowei Cai , Zhengui Huang , Yu Hou , Jian Qin , Zhihua Chen","doi":"10.1016/j.dt.2024.11.007","DOIUrl":"10.1016/j.dt.2024.11.007","url":null,"abstract":"<div><div>To examine the similarities and differences in the evolution of cavity, wetting and dynamics of a high-speed, oblique water-entry projectile with different positive angles of attack, a comparative analysis has been conducted based on the numerical results of two mathematical models, the rigid-body model and fluid-structure interaction model. In addition, the applicable scope of the above two methods, and the structural response characteristics of the projectile have also been investigated. Our results demonstrate that: (1) The impact loads and angular motion of the projectile of the rigid-body method are more likely to exhibit periodic variations due to the periodic tail slap, its range of positive angles of attack is about <em>α</em> < 2°. (2) When the projectile undergone significant wetting, a strong coupling effect is observed among wetting, structural deformation, and projectile motion. With the applied projectile shape, it is observed that, when the projectile bends, the final wetting position is that of Part B (cylinder of body). With the occurrence of this phenomenon, the projectile ballistics become completely unstable. (3) The force exerted on the lower surface of the projectile induced by wetting is the primary reason of the destabilization of the projectile trajectory and structural deformation failure. Bending deformation is most likely to appear at the junction of Part C (cone of body) and Part D (tail). The safe angles of attack of the projectile stability are found to be about <em>α</em> ≤ 2°.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"46 ","pages":"Pages 133-155"},"PeriodicalIF":5.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829802","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

A fast-running engineering tool for assessing structural vulnerability to blast loading 一种快速运行的工程工具，用于评估结构对爆炸载荷的脆弱性

IF 5

Defence Technology(防务技术) Pub Date : 2025-04-01 DOI: 10.1016/j.dt.2024.12.009

Carlo Crispino, Salvatore Annunziata, Alberto Contini, Luca Lomazzi, Andrea Manes

{"title":"A fast-running engineering tool for assessing structural vulnerability to blast loading","authors":"Carlo Crispino, Salvatore Annunziata, Alberto Contini, Luca Lomazzi, Andrea Manes","doi":"10.1016/j.dt.2024.12.009","DOIUrl":"10.1016/j.dt.2024.12.009","url":null,"abstract":"<div><div>Assessing the vulnerability of a platform is crucial in its design. In fact, the results obtained from vulnerability analyses provide valuable information, leading to precise design choices or corrective solutions that enhance the platform's chances of surviving different scenarios. Such scenarios can involve various types of threats that can affect the platform's survivability. Among such, blast waves impacting the platform's structure represent critical conditions that have not yet been studied in detail. That is, frameworks for vulnerability assessment that can deal with blast loading have not been presented yet. In this context, this work presents a fast-running engineering tool that can quantify the risk that a structure fails when it is subjected to blast loading from the detonation of high explosive-driven threats detonating at various distances from the structure itself. The tool has been implemented in an in-house software that calculates vulnerability to various impacting objects, and its capabilities have been shown through a simplified, yet realistic, case study. The novelty of this research lies in the development of an integrated computational environment capable of calculating the platform's vulnerability to blast waves, without the need for running expensive finite element simulations. In fact, the proposed tool is fully based on analytical models integrated with a probabilistic approach for vulnerability calculation.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"46 ","pages":"Pages 244-254"},"PeriodicalIF":5.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829806","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

Interface geometry modification to trap plasticized flash for improved joint strength of dissimilar rotary friction welds 改进界面几何形状以捕获塑化闪光以提高不同类型旋转摩擦焊缝的接合强度

IF 5

Defence Technology(防务技术) Pub Date : 2025-04-01 DOI: 10.1016/j.dt.2024.12.010

Neeraj Kumar Mishra , S.G.K. Manikandan , Suresh Meshram , Amber Shrivastava

{"title":"Interface geometry modification to trap plasticized flash for improved joint strength of dissimilar rotary friction welds","authors":"Neeraj Kumar Mishra , S.G.K. Manikandan , Suresh Meshram , Amber Shrivastava","doi":"10.1016/j.dt.2024.12.010","DOIUrl":"10.1016/j.dt.2024.12.010","url":null,"abstract":"<div><div>Rotary friction welding is a highly effective solid-state technique for joining dissimilar materials, which offers the potential for significant weight reduction without compromising strength. Traditionally, during rotary friction welding, the severely deformed material, or flash, is expelled from the interface and machined away to achieve the desired joint geometry. However, this work introduces a novel approach: trapping the flash within the joint to improve joint properties. The study investigates two different interface geometry combinations—flat-flat and flat-taper interfaces. Previous research shows that Ni interlayer between steel and titanium can enhance the joint strength. This study builds on the existing knowledge (effect of Ni interlayer) by examining the influence of interface geometry to further improve the dissimilar joint performance. The experimental results, including tensile testing and microstructural characterization, highlight the superior performance of the flat-taper interface. The modified geometry minimizes flash loss, providing a cavity that retains both the flash and the Ni interlayer within the joint. This retention promotes dynamic recrystallization, resulting in refined grain structures near the interface. Moreover, the trapped Ni interlayer effectively prevents the formation of brittle Fe-Ti intermetallic compounds at the dissimilar material interface. The findings reveal that the flat-taper interface improved joint strength by an impressive 105% compared to the flat-flat interface. This innovative geometry modification demonstrates the potential to enhance mechanical properties of dissimilar joints through better flash and interlayer management.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"46 ","pages":"Pages 71-78"},"PeriodicalIF":5.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829989","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

3D printed hybrid rocket fuels with μAl core-shell particles coated with polyvinylidene fluoride and polydopamine: Enhanced combustion characteristics 聚偏氟乙烯和聚多巴胺包覆μAl核壳颗粒的3D打印混合火箭燃料：增强燃烧特性

IF 5

Defence Technology(防务技术) Pub Date : 2025-04-01 DOI: 10.1016/j.dt.2024.12.002

Qihang Chen , Xiaolong Fu , Weitao Yang , Suhang Chen , Zhiming Guo , Rui Hu , Huijie Zhang , Lianpeng Cui , Xu Xia

{"title":"3D printed hybrid rocket fuels with μAl core-shell particles coated with polyvinylidene fluoride and polydopamine: Enhanced combustion characteristics","authors":"Qihang Chen , Xiaolong Fu , Weitao Yang , Suhang Chen , Zhiming Guo , Rui Hu , Huijie Zhang , Lianpeng Cui , Xu Xia","doi":"10.1016/j.dt.2024.12.002","DOIUrl":"10.1016/j.dt.2024.12.002","url":null,"abstract":"<div><div>3D printing technology enhances the combustion characteristics of hybrid rocket fuels by enabling complex geometries. However, improvements in regression rates and energy properties of monotonous 3D printed fuels have been limited. This study explores the impact of poly (vinylidene fluoride) and polydopamine-coated aluminum particles on the thermal and combustion properties of 3D printed hybrid rocket fuels. Physical self-assembly and anti-solvent methods were employed for constructing composite μAl particles. Characterization using SEM, XRD, XPS, FTIR, and μCT revealed a core-shell structure and homogeneous elemental distribution. Thermal analysis showed that PVDF coatings significantly increased the heat of combustion for aluminum particles, with maximum enhancement observed in μAl@PDA@PVDF (denoted as μAl@PF) at 6.20 kJ/g. Subsequently, 3D printed fuels with varying pure and composite μAl particle contents were prepared using 3D printing. Combustion tests indicated higher regression rates for Al@PF/Resin composites compared to pure resin, positively correlating with particle content. The fluorocarbon-alumina reaction during the combustion stage intensified Al particle combustion, reducing residue size. A comprehensive model based on experiments provides insights into the combustion process of PDA and PVDF-coated droplets. This study advances the design of 3D-printed hybrid rocket fuels, offering strategies to improve regression rates and energy release, crucial for enhancing solid fuel performance for hybrid propulsion.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"46 ","pages":"Pages 59-70"},"PeriodicalIF":5.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829974","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

Experimental and numerical study on attenuation of shock waves in ventilation pipes 通风管道中冲击波衰减的实验与数值研究

IF 5

Defence Technology(防务技术) Pub Date : 2025-04-01 DOI: 10.1016/j.dt.2024.12.006

Wenjun Yu , Shuxin Deng , Shengyun Chen , Bingbing Yu , Dongyan Jin , Zhangjun Wu , Yaguang Sui , Huajie Wu

{"title":"Experimental and numerical study on attenuation of shock waves in ventilation pipes","authors":"Wenjun Yu , Shuxin Deng , Shengyun Chen , Bingbing Yu , Dongyan Jin , Zhangjun Wu , Yaguang Sui , Huajie Wu","doi":"10.1016/j.dt.2024.12.006","DOIUrl":"10.1016/j.dt.2024.12.006","url":null,"abstract":"<div><div>With different structural forms of ventilation pipes have various attenuation effects on incident shock waves while meeting ventilation requirements. The attenuation mechanism and the propagation law of shock waves in ventilation pipes of different structures are investigated by experiments and numerical simulations. Furthermore, for the same structure, the effects of peak pressure and positive pressure time on the attenuation rate are discussed. It is found that the attenuation rate increases with the incident shock wave pressure, and the shock wave attenuation rate tends to reach its limiting value <em>k</em> for the same structure and reasonably short positive pressure time. Under the same conditions, the attenuation rate is calculated using the pressure of the shock wave as follows: diffusion chamber pipe, branch pipe and self-consumption pipe; the attenuation rate per unit volume is calculated as follows: self-consumption pipe, branch pipe and diffusion chamber pipe. In addition, an easy method is provided to calculate the attenuation rate of the shock wave in single and multi-stage ventilation pipes. Corresponding parameters are provided for various structures, and the margin of error between the formulae and experimental results is within 10%, which is significant for engineering applications.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"46 ","pages":"Pages 156-168"},"PeriodicalIF":5.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829803","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

Review on integral stiffened panel of aircraft fuselage structure 飞机机身结构整体加筋面板研究进展

IF 5

Defence Technology(防务技术) Pub Date : 2025-04-01 DOI: 10.1016/j.dt.2024.11.005

Devi Chandra , Y. Nukman , Muhammad Adlan Azka , S.M. Sapuan , J. Yusuf

{"title":"Review on integral stiffened panel of aircraft fuselage structure","authors":"Devi Chandra , Y. Nukman , Muhammad Adlan Azka , S.M. Sapuan , J. Yusuf","doi":"10.1016/j.dt.2024.11.005","DOIUrl":"10.1016/j.dt.2024.11.005","url":null,"abstract":"<div><div>The increasing demand to decrease manufacturing costs and weight reduction is driving the aircraft industry to change the use of conventional riveted stiffened panels to integral stiffened panels (ISP) for aircraft fuselage structures. ISP is a relatively new structure in aircraft industries and is considered the most significant development in a decade. These structures have the potential to replace the conventional stiffened panel due to the emergence of manufacturing technology, including welding, high-speed machining (HSM), extruding, and bonding. Although laser beam welding (LBW) and friction stir welding (FSW) have been applied in aircraft companies, many investigations into ISP continue to be conducted. In this review article, the current state of understanding and advancement of ISP structure is addressed. A particular explanation has been given to (a) buckling performance, (b) fatigue performance of the ISP, (c) modeling and simulation aspects, and (d) the impact of manufacturing decisions in welding processes on the final structural behavior of the ISP during service. Compared to riveted panels, machined ISP had a better compressive buckling load, and FSW integral panels had a lower buckling load than riveted panels. Compressive residual stress decreased the stress intensity factor (SIF) rates, slowing down the growth of fatigue cracks as occurred in FSW and LBW ISP.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"46 ","pages":"Pages 1-11"},"PeriodicalIF":5.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830382","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

Three-dimensional finite-time optimal cooperative guidance with integrated information fusion observer 带有综合信息融合观测器的三维有限时间优化协同制导

IF 5

Defence Technology(防务技术) Pub Date : 2025-04-01 DOI: 10.1016/j.dt.2024.12.022

Yiao Zhan, Linwei Wang, Di Zhou

{"title":"Three-dimensional finite-time optimal cooperative guidance with integrated information fusion observer","authors":"Yiao Zhan, Linwei Wang, Di Zhou","doi":"10.1016/j.dt.2024.12.022","DOIUrl":"10.1016/j.dt.2024.12.022","url":null,"abstract":"<div><div>Intercepting high-maneuverability hypersonic targets in near-space environments poses significant challenges due to their extreme speeds and evasive capabilities. To address these challenges, this study presents an integrated approach that combines a Three-Dimensional Finite-Time Optimal Cooperative Guidance Law (FTOC) with an Information Fusion Anti-saturation Predefined-time Observer (IFAPO). The proposed FTOC guidance law employs a nonlinear, non-quadratic finite-time optimal control strategy designed for rapid convergence within the limited timeframes of near-space interceptions, avoiding the need for remaining flight time estimation or linear decoupling inherent in traditional methods. To complement the guidance strategy, the IFAPO leverages multi-source information fusion theory and incorporates anti-saturation mechanisms to enhance target maneuver estimation. This method ensures accurate and real-time prediction of target acceleration while maintaining predefined convergence performance, even under complex interception conditions. By integrating the FTOC guidance law and IFAPO, the approach optimizes cooperative missile positioning, improves interception success rates, and minimizes fuel consumption, addressing practical constraints in military applications. Simulation results and comparative analyses confirm the effectiveness of the integrated approach, demonstrating its capability to achieve cooperative interception of highly maneuvering targets with enhanced efficiency and reduced economic costs, aligning with realistic combat scenarios.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"46 ","pages":"Pages 12-28"},"PeriodicalIF":5.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829971","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

Toughening modification of cellulose acetate butyrate and using for CL-20-based polymer bonded explosives 醋酸纤维素丁酸酯的增韧改性及其在 CL-20 型聚合物粘合炸药中的应用

IF 5

Defence Technology(防务技术) Pub Date : 2025-04-01 DOI: 10.1016/j.dt.2024.09.004

Na Li , Zhengzheng Zhang , Fengqin Shang , Shaohua Jin , Lijie Li , Changgen Feng , Jiaming Gao , Yu Chen

{"title":"Toughening modification of cellulose acetate butyrate and using for CL-20-based polymer bonded explosives","authors":"Na Li , Zhengzheng Zhang , Fengqin Shang , Shaohua Jin , Lijie Li , Changgen Feng , Jiaming Gao , Yu Chen","doi":"10.1016/j.dt.2024.09.004","DOIUrl":"10.1016/j.dt.2024.09.004","url":null,"abstract":"<div><div>CAB is a binder commonly utilized in CL-20-based mixed explosives. Based on the requirements of CL-20-based polymer bonded explosives in formability, safety, and detonation energy, we explored a high-toughness and low dosage CAB binder system. CAB was subjected to different toughening modifications and the effects of the modified CAB binders on the bonding and coating of CL-20 crystals, as well as the formability, safety, and mechanical properties of CL-20-based polymer bonded explosive molding powder (MP) were evaluated. The changes in glass transition temperature (<em>T</em><sub>g</sub>) and mechanical properties of the modified binders were investigated using the molecular dynamics simulation at first. A series of modified binders with different molecular weights were then synthesized and characterized by FTIR, <sup>1</sup>H NMR, <sup>13</sup>C NMR and SEC. The <em>T</em><sub>g</sub> and cross-sectional morphologies of the binder membranes were determined by DSC and SEM. The tensile properties of the binder membranes with different molecular weights and their mixtures with the plasticizer were evaluated at different temperature. With the optimized modified binder, CL-20/CAB and CL-20/CAB-<em>g</em>-PCL-3 MPs with the same plasticizer ratio and Cl-20/CAB-<em>g</em>-PCL-3 MP with a lower plasticizer ratio and higher CL-20 content were prepared and evaluated for the bonding and coating effects, crystal form, mechanical sensitivity and specific heat capacity (<em>C</em><sub>p</sub>) by SEM, XRD, sensitivity testing and DSC, respectively. Their compressive strengths and splitting tensile strengths were measured at different temperature using a universal testing machine. Our work has provided a high-toughness and low-dosage binder system for CL-20-based MPs and offers a novel strategy to improve the formability, safety, and energy of CL-20 based polymer bonded explosives.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"46 ","pages":"Pages 29-39"},"PeriodicalIF":5.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829973","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

Numerical investigation on the engraving process of a pyrotechnic actuator with an improved two-phase flow model of interior ballistic 基于改进的内弹道两相流模型的火药作动器雕刻过程数值研究

IF 5

Defence Technology(防务技术) Pub Date : 2025-04-01 DOI: 10.1016/j.dt.2024.11.004

Yue Li , Cong Liu , Cheng Cheng , Genghui Jiang

{"title":"Numerical investigation on the engraving process of a pyrotechnic actuator with an improved two-phase flow model of interior ballistic","authors":"Yue Li , Cong Liu , Cheng Cheng , Genghui Jiang","doi":"10.1016/j.dt.2024.11.004","DOIUrl":"10.1016/j.dt.2024.11.004","url":null,"abstract":"<div><div>By combining with an improved model on engraving process, a two-phase flow interior ballistic model has been proposed to accurately predict the flow and energy conversion behaviors of pyrotechnic actuators. Using computational fluid dynamics (CFD), the two-phase flow and piston engraving characteristics of a pyrotechnic actuator are investigated. Initially, the current model was utilized to examine the intricate, multi-dimensional flow, and energy conversion characteristics of the propellant grains and combustion gas within the pyrotechnic actuator chamber. It was discovered that the combustion gas on the wall's constant transition from potential to kinetic energy, along with the combined effect of the propellant motion, are what create the pressure oscillation within the chamber. Additionally, a numerical analysis was conducted to determine the impact of various parameters on the pressure oscillation and piston motion, including pyrotechnic charge, pyrotechnic particle size, and chamber structural dimension. The findings show that decreasing the pyrotechnic charge will lower the terminal velocity, while increasing and decreasing the pyrotechnic particle size will reduce the pressure oscillation in the chamber. The pyrotechnic particle size has minimal bearing on the terminal velocity. The results of this investigation offer a trustworthy forecasting instrument for comprehending and creating pyrotechnic actuator designs.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"46 ","pages":"Pages 120-132"},"PeriodicalIF":5.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829801","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