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Advances in Military Technology最新文献

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A Motion Model of a Remotely Operated Underwater Vehicle: CFD Simulation 遥控水下航行器的运动模型:CFD仿真
Advances in Military Technology Pub Date : 2022-02-02 DOI: 10.3849/aimt.1491
T. N. Dung, V. Horak, The Nguyen Luc, Van Nguyen Dung, Duc Do Linh
{"title":"A Motion Model of a Remotely Operated Underwater Vehicle: CFD Simulation","authors":"T. N. Dung, V. Horak, The Nguyen Luc, Van Nguyen Dung, Duc Do Linh","doi":"10.3849/aimt.1491","DOIUrl":"https://doi.org/10.3849/aimt.1491","url":null,"abstract":"The article is directly related to the authors’ previous study of the remotely operated underwater vehicle’s (ROV) motion, where the mathematical model of the ROV motion is derived for laminar flow of water. This solution of the ROV motion has been improved by using the three-dimensional computational fluid dynamics (CFD) simulation that allows simulating the turbulent flow, which is mainly generated by propellers. Both methods were coupled to obtain more accurate values of hydrodynamic damping coefficients for the improved determination of the ROV motion velocity. Results of the solution are discussed and some of them are compared with the experiment.","PeriodicalId":39125,"journal":{"name":"Advances in Military Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45349845","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: 6
Matched Filter Implementation, Complexity, and Gain in Fractional Fourier Domain 匹配滤波器的实现，复杂性和增益在分数傅里叶域
Advances in Military Technology Pub Date : 2021-12-30 DOI: 10.3849/aimt.01513
S. Elgamel
{"title":"Matched Filter Implementation, Complexity, and Gain in Fractional Fourier Domain","authors":"S. Elgamel","doi":"10.3849/aimt.01513","DOIUrl":"https://doi.org/10.3849/aimt.01513","url":null,"abstract":"The radar matched filter is implemented in fractional Fourier domain (FrFD) and the required processing steps to perform the radar matched filter in FrFD are demonstrated. The complexity of the FrFD matched filter over the normal frequency transform matched filter is also investigated. The performance enhancements for using the matched filter in the FrFD are presented and the enhancement in the signal to noise ratio (SNR) output at different target SNRs are also described.","PeriodicalId":39125,"journal":{"name":"Advances in Military Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45578674","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
Modeling and Simulation on the Rotating Band Engraving Process of 23 mm Projectile 23mm弹丸旋带雕刻过程建模与仿真
Advances in Military Technology Pub Date : 2021-12-20 DOI: 10.3849/aimt.1521
V. M. Do, X. S. Bui, V. Nguyen
{"title":"Modeling and Simulation on the Rotating Band Engraving Process of 23 mm Projectile","authors":"V. M. Do, X. S. Bui, V. Nguyen","doi":"10.3849/aimt.1521","DOIUrl":"https://doi.org/10.3849/aimt.1521","url":null,"abstract":"Dynamic engraving process of 23 mm projectile was studied using numerical simulation. A finite element model of projectile and barrel during the engraving process was constructed, and the deformation process of the driving band, the displacement parameters of the projectile, the force interaction between the projectile and the barrel were determined. To evaluate the simulation model, a semi-static experiment was carried out on an MTS-810 universal testing machine with a cross-head speed of 20 mm min−1. The simulation results show that the mechanism of the 23 mm projectile rotating band engraving process is the plastic deformation process of the rotating band material, engraving time is 1.12 m s, and the projectile velocity after engraving is 105 m s−1. The simulation results reflect the actual rotating band engraving process, which is very distinct from the assumptions used in the classical ballistic model. This work provides an approach to investigating the interior ballistic processes considering the dynamic engraving of rotating bands.","PeriodicalId":39125,"journal":{"name":"Advances in Military Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45683228","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: 1
Modeling and Simulation on the Rotating Band Engraving Process of 23 mm Projectile 23mm弹丸旋转带雕刻过程的建模与仿真
Advances in Military Technology Pub Date : 2021-12-20 DOI: 10.3849/aimt.01521
Minh Do V., S. X, Huong Nguyen V.
{"title":"Modeling and Simulation on the Rotating Band Engraving Process of 23 mm Projectile","authors":"Minh Do V., S. X, Huong Nguyen V.","doi":"10.3849/aimt.01521","DOIUrl":"https://doi.org/10.3849/aimt.01521","url":null,"abstract":"Dynamic engraving process of 23 mm projectile was studied using numerical simulation. A finite element model of projectile and barrel during the engraving process was constructed, and the deformation process of the driving band, the displacement parameters of the projectile, the force interaction between the projectile and the barrel were determined. To evaluate the simulation model, a semi-static experiment was carried out on an MTS-810 universal testing machine with a cross-head speed of 20 mm min−1. The simulation results show that the mechanism of the 23 mm projectile rotating band engraving process is the plastic deformation process of the rotating band material, engraving time is 1.12 m s, and the projectile velocity after engraving is 105 m s−1. The simulation results reflect the actual rotating band engraving process, which is very distinct from the assumptions used in the classical ballistic model. This work provides an approach to investigating the interior ballistic processes considering the dynamic engraving of rotating bands.","PeriodicalId":39125,"journal":{"name":"Advances in Military Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48076864","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: 1
Air-Fuel Mixture Temperatures with Light and Heavy Fuels for Effective Spark Ignition Engine Work 有效火花点火发动机工作的轻、重燃料空气燃料混合温度
Advances in Military Technology Pub Date : 2021-12-15 DOI: 10.3849/aimt.1501
V. Raide, R. Ilves, J. Olt
{"title":"Air-Fuel Mixture Temperatures with Light and Heavy Fuels for Effective Spark Ignition Engine Work","authors":"V. Raide, R. Ilves, J. Olt","doi":"10.3849/aimt.1501","DOIUrl":"https://doi.org/10.3849/aimt.1501","url":null,"abstract":"This research resulted from military interest in finding methods to provide distributed electricity generation in order to support comprehensive state defence measures. The aim of the study was to investigate the effect of a heated air-fuel mixture on the combustion process of a spark ignition (SI) engine, and to highlight the maximum temperatures to be applied to air-fuel mixtures with different fuel fractions in order to avoid any detonation of the fuel mixture in the engine. Tests were carried out with a petrol engine generator (GENSET) so that an investigation could be conducted into the effect of the air-fuel mixture on the engine’s combustion. It turned out that heating the air-fuel mixture permits the use of heavier fraction fuels than engine petrol in SI engines does, including diesel fuel and biodiesel fuel, and also that the use of heavy fraction fuels in SI engines is effective mainly under low and middle loads.","PeriodicalId":39125,"journal":{"name":"Advances in Military Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49249525","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
Model of the Surface-to-Air Missile System Reliability during Long-Term Operation 地空导弹系统长期运行可靠性模型
Advances in Military Technology Pub Date : 2021-12-14 DOI: 10.3849/aimt.1506
V. Lukyanchuk, B. Lanetskii, I.V. Koval, P. Open’ko, V.V. Tуurin, V. Khoma
{"title":"Model of the Surface-to-Air Missile System Reliability during Long-Term Operation","authors":"V. Lukyanchuk, B. Lanetskii, I.V. Koval, P. Open’ko, V.V. Tуurin, V. Khoma","doi":"10.3849/aimt.1506","DOIUrl":"https://doi.org/10.3849/aimt.1506","url":null,"abstract":"During the long-term operation, anti-aircraft missile weapons are characterized by the technical condition and level of reliability change influeincing the efficiency on the intended use. The article presents a model of surface-to-air missile system (SAMS) reliability during long-term operation, which contains a set of models, namely: a model of operation of ground combat assets (GCA) of SAMS according to the typical cyclogram of intended use (TCIU); a reliability dynamics model of SAMS GCA in the established system of maintenance and repair (SMR) and a reliability dynamics model of surface-to-air missiles (SAM) during extended usage. It is expedient to use the developed model at substantiation of requirements to the indicators of SAMS and SAM reliability for their development or modernization; when developing SAMS repair plans in terms of determining the time of SAMS GCA and (or) SAM repairing time and when developing methods for assessing the effectiveness of SAMS taking into account the duration of SAMS GCA and SAMS usage.","PeriodicalId":39125,"journal":{"name":"Advances in Military Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49223753","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: 1
Flight Range Extension of a Guided Aerial Bomb with a Rocket Engine during Climb Bombing 爬升轰炸中火箭发动机制导航空炸弹的飞行范围扩展
Advances in Military Technology Pub Date : 2021-09-28 DOI: 10.3849/aimt.1462
I. S. Kravchuk, D. Bashynskyi, V. V. Taranenko, M. Zirka
{"title":"Flight Range Extension of a Guided Aerial Bomb with a Rocket Engine during Climb Bombing","authors":"I. S. Kravchuk, D. Bashynskyi, V. V. Taranenko, M. Zirka","doi":"10.3849/aimt.1462","DOIUrl":"https://doi.org/10.3849/aimt.1462","url":null,"abstract":"The possibility of a significant flight range extension of a guided aerial bomb during climb bombing due to the jet thrust created by a solid-propellant rocket engine was considered. By means of simulation, a comparative analysis of the range of a guided aerial bomb equipped (not equipped) with a solid-propellant rocket engine under typical flight conditions of the carrier aircraft during level flight and climb bombing was performed. It was demonstrated that the use of a solid-propellant rocket engine, whose mass is 20 % of the guided aerial bomb’s mass, allows to increase the horizontal range of its flight at least twice.","PeriodicalId":39125,"journal":{"name":"Advances in Military Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49229291","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
Effect of Some Structural Parameters on Firing Stability of Shooter-Weapon System 一些结构参数对射击-武器系统射击稳定性的影响
Advances in Military Technology Pub Date : 2021-07-02 DOI: 10.3849/aimt.1487
Van Bien Vo, Van Phuc Ta, Martin Macko
{"title":"Effect of Some Structural Parameters on Firing Stability of Shooter-Weapon System","authors":"Van Bien Vo, Van Phuc Ta, Martin Macko","doi":"10.3849/aimt.1487","DOIUrl":"https://doi.org/10.3849/aimt.1487","url":null,"abstract":"This article presents a method to establish the dynamic model of the Shooter-weapon system when firing based on Lagrange’s theorem and the theory of multibody system dynamics, in which the influence of the human body was taken into account. In the dynamic model, the influence of the gunner is solved by using elastic-damping links in the x, y and z axes. The dynamic model is created for a portable gas-operated submachine gun and contains three solids with seven degrees of freedom. The 7.62 mm AKM submachine gun has been used for the model simulation and experimental verification. The dynamic simulation was conducted and then the results were compared with the corresponding experimental data. The model simulation results are very close to the experimental results. This study aims to survey the influence of various parameters on gun stability in the shooting. It is possible to apply these results to portable automatic guns.","PeriodicalId":39125,"journal":{"name":"Advances in Military Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45290185","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: 2
Human Factors in Aviation Disasters of Military Jet Aircraft of Czechoslovakia and the Czech Republic 捷克斯洛伐克和捷克共和国军用喷气式飞机空难中的人为因素
Advances in Military Technology Pub Date : 2021-06-30 DOI: 10.3849/aimt.01451
O. Zavila
{"title":"Human Factors in Aviation Disasters of Military Jet Aircraft of Czechoslovakia and the Czech Republic","authors":"O. Zavila","doi":"10.3849/aimt.01451","DOIUrl":"https://doi.org/10.3849/aimt.01451","url":null,"abstract":"The article deals with aviation disasters from 1948 to the present and it involves disasters of military jet fighter, fighter-trainer and trainer aircraft. It focuses on the role of human factors of the flight personnel. Based on the extensive analyses of circumstances and causes of individual aviation occurrences, root causes of factors that have endangered the lives of pilots in carrying out their work are determined. To conclude, recommendations are given to reduce or in many cases even to eliminate the effects of these factors on flight safety.","PeriodicalId":39125,"journal":{"name":"Advances in Military Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43598583","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
Space Systems as the Weakest Link 空间系统是最薄弱的环节
Advances in Military Technology Pub Date : 2021-06-30 DOI: 10.3849/aimt.01409
Sławomir Dygnatowski
{"title":"Space Systems as the Weakest Link","authors":"Sławomir Dygnatowski","doi":"10.3849/aimt.01409","DOIUrl":"https://doi.org/10.3849/aimt.01409","url":null,"abstract":"Although it is widely believed that the space sector is one of the pillars of national security, in practice cosmic systems exist somewhat outside the area of critical infra-structures discussion. Cybersecurity of space systems does not differ significantly from industrial cybersecurity, however, the uniqueness of the sector and space technologies means that its vulnerability to digital incidents depends on a number of factors that does not occur anywhere else. The purpose of the article is to defend the thesis that space systems are the weakest link in critical infrastructure systems, because the level of their cybersecurity is still disproportionate to the level of their technological ad-vancement.","PeriodicalId":39125,"journal":{"name":"Advances in Military Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47581474","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
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