{"title":"Efficient Response Solution for Integrated Command and Control Center using Automatic Interactive Voice Response System","authors":"Daniel Gîrbea, Petrica Ciotirnae","doi":"10.32754/jmt.2021.1.06","DOIUrl":"https://doi.org/10.32754/jmt.2021.1.06","url":null,"abstract":"","PeriodicalId":315050,"journal":{"name":"Journal of Military Technology","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127289113","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}
O. Iorga, M. Munteanu, M. Mărmureanu, V. Ţigănescu, A. Marin
{"title":"Combined CFD – Numerical Integration Method for the Determination of Exterior Ballistics for a Reactive Projectile","authors":"O. Iorga, M. Munteanu, M. Mărmureanu, V. Ţigănescu, A. Marin","doi":"10.32754/jmt.2021.1.01","DOIUrl":"https://doi.org/10.32754/jmt.2021.1.01","url":null,"abstract":"","PeriodicalId":315050,"journal":{"name":"Journal of Military Technology","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130773314","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}
O. Iorga, T. Țigănescu, A. Marin, M. Munteanu, I. Simion
Digital Object Identifier 10.32754/JMT.2020.2.04 25 1Abstract —Urban area combat theaters require the use of portable weapons capable to neutralize targets inside buildings or light armored improvised vehicles. This work presents the design and testing of piercing ammunition for 73 mm recoilless canon with fragmentation and thermobaric effect. The advantages relative to its intended use are represented by its capability to pierce reinforced concrete and light armored targets, the fragmentation and thermobaric explosive delayed effect, capable to neutralize both soft targets and structures, and the reduced mass and dimensions of the armament system intended to be used. The warhead is composed of a piercing projectile with thin wall in order to accommodate an explosive charge with thermobaric effect, initiated by a bottom fuse. The warhead is coupled with a rocket motor in order to augment the initial velocity of the projectile for the maximization of the piercing capability. The paper presents the process of forging and machining of the warhead shell as well as the numerical simulation regarding the terminal ballistics of the ammunition, which was validated trough live fire experiments.
{"title":"Design and Testing of a Thermobaric Piercing Projectile for 73 mm Recoilless Canon","authors":"O. Iorga, T. Țigănescu, A. Marin, M. Munteanu, I. Simion","doi":"10.32754/JMT.2020.2.04","DOIUrl":"https://doi.org/10.32754/JMT.2020.2.04","url":null,"abstract":"Digital Object Identifier 10.32754/JMT.2020.2.04 25 1Abstract —Urban area combat theaters require the use of portable weapons capable to neutralize targets inside buildings or light armored improvised vehicles. This work presents the design and testing of piercing ammunition for 73 mm recoilless canon with fragmentation and thermobaric effect. The advantages relative to its intended use are represented by its capability to pierce reinforced concrete and light armored targets, the fragmentation and thermobaric explosive delayed effect, capable to neutralize both soft targets and structures, and the reduced mass and dimensions of the armament system intended to be used. The warhead is composed of a piercing projectile with thin wall in order to accommodate an explosive charge with thermobaric effect, initiated by a bottom fuse. The warhead is coupled with a rocket motor in order to augment the initial velocity of the projectile for the maximization of the piercing capability. The paper presents the process of forging and machining of the warhead shell as well as the numerical simulation regarding the terminal ballistics of the ammunition, which was validated trough live fire experiments.","PeriodicalId":315050,"journal":{"name":"Journal of Military Technology","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128276527","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}
Alexandru Savastre, Cătălin Fățilă, Irina Cârceanu, Adrian Bolojan
{"title":"Analysis of the Impact Behaviour for Different Configurations of an Experimental 30×165 mm AP-T Projectile","authors":"Alexandru Savastre, Cătălin Fățilă, Irina Cârceanu, Adrian Bolojan","doi":"10.32754/JMT.2020.2.07","DOIUrl":"https://doi.org/10.32754/JMT.2020.2.07","url":null,"abstract":"","PeriodicalId":315050,"journal":{"name":"Journal of Military Technology","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125393464","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}
Florin-Marian Dîrloman, T. Țigănescu, T. Rotariu, M. Ungureanu, T. Zecheru
Digital Object Identifier 10.32754/JMT.2020.2.05 31 1Abstract—The current paper is aimed at providing an overview of the existing literature in the field of composite solid propellants to highlight some environmentally-friendly oxidizers that could successfully substitute ammonium perchlorate. In this regard, two oxidizers, ammonium nitrate and ammonium dinitramide, are considered in terms of performances and safety parameters.
{"title":"Eco-Oxidizers for Composite Propellants: Ammonium Nitrate and Ammonium Dinitramide","authors":"Florin-Marian Dîrloman, T. Țigănescu, T. Rotariu, M. Ungureanu, T. Zecheru","doi":"10.32754/JMT.2020.2.05","DOIUrl":"https://doi.org/10.32754/JMT.2020.2.05","url":null,"abstract":"Digital Object Identifier 10.32754/JMT.2020.2.05 31 1Abstract—The current paper is aimed at providing an overview of the existing literature in the field of composite solid propellants to highlight some environmentally-friendly oxidizers that could successfully substitute ammonium perchlorate. In this regard, two oxidizers, ammonium nitrate and ammonium dinitramide, are considered in terms of performances and safety parameters.","PeriodicalId":315050,"journal":{"name":"Journal of Military Technology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127308351","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}
Daniela Pulpea, D. Buliga, M. Bunea, B. Pulpea, Gabriela Toader
Digital Object Identifier 10.32754/JMT.2020.2.02 13 1Abstract—In general, to achieve surface decontamination large amounts of water are used as the main solvent in universal decontamination solutions. The used water, in order to be released in the stream flow, must be treated to eliminate the toxic substances. Strippable coatings visibly minimize the amount of waste resulting from the decontamination process. Biodegradable films based on polyvinyl alcohol were synthesized and used within this study. The polymeric coatings also contains Bentonite nano-clay (BT) that is a rheological agent, a complexing agent used to entrap the heavy metal or radioactive particles and glycerol used as an additive to give the films the proper mechanical properties. Nevertheless, the used coatings must also be disposed of in a certain way. This paper studies few methods in which strippable coatings that are presented as chemical and/or radioactive waste are treated and proposes means to reutilize used films that are or/are not contaminated, but also suggests a simplified technological process for producing such decontamination solutions.
{"title":"The Disposal of Strippable Coatings Employed in Chemical and Radioactive Surface Decontamination","authors":"Daniela Pulpea, D. Buliga, M. Bunea, B. Pulpea, Gabriela Toader","doi":"10.32754/JMT.2020.2.02","DOIUrl":"https://doi.org/10.32754/JMT.2020.2.02","url":null,"abstract":"Digital Object Identifier 10.32754/JMT.2020.2.02 13 1Abstract—In general, to achieve surface decontamination large amounts of water are used as the main solvent in universal decontamination solutions. The used water, in order to be released in the stream flow, must be treated to eliminate the toxic substances. Strippable coatings visibly minimize the amount of waste resulting from the decontamination process. Biodegradable films based on polyvinyl alcohol were synthesized and used within this study. The polymeric coatings also contains Bentonite nano-clay (BT) that is a rheological agent, a complexing agent used to entrap the heavy metal or radioactive particles and glycerol used as an additive to give the films the proper mechanical properties. Nevertheless, the used coatings must also be disposed of in a certain way. This paper studies few methods in which strippable coatings that are presented as chemical and/or radioactive waste are treated and proposes means to reutilize used films that are or/are not contaminated, but also suggests a simplified technological process for producing such decontamination solutions.","PeriodicalId":315050,"journal":{"name":"Journal of Military Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130701514","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}
Digital Object Identifier 10.32754/JMT.2020.2.09 55 1Abstract—The majority of modern applications require signal processing methods that can provide the expected results, such as signal source’s position in space, based on the time delay between the received signals. The performance of each method varies according to the signal to noise ratio, the sampling frequency, or the type of signal, etc. This paper aims to present and compare several signal processing methods in an effort to determine the optimum solution for the localization of signal sources. Methods such as the Spectrogram, Wavelet Transform, Cross-Correlation or Recurrence Plot Analysis were simulated using Matlab software. The conclusion is that Cross-Correlation is the optimum method in real-time applications, in the case of a high sampling frequency, followed by Recurrence Plot Analysis.
{"title":"An Overview of Signal Processing Methods for Signal Source Localization","authors":"Paraschiva-Cristina Popovici","doi":"10.32754/JMT.2020.2.09","DOIUrl":"https://doi.org/10.32754/JMT.2020.2.09","url":null,"abstract":"Digital Object Identifier 10.32754/JMT.2020.2.09 55 1Abstract—The majority of modern applications require signal processing methods that can provide the expected results, such as signal source’s position in space, based on the time delay between the received signals. The performance of each method varies according to the signal to noise ratio, the sampling frequency, or the type of signal, etc. This paper aims to present and compare several signal processing methods in an effort to determine the optimum solution for the localization of signal sources. Methods such as the Spectrogram, Wavelet Transform, Cross-Correlation or Recurrence Plot Analysis were simulated using Matlab software. The conclusion is that Cross-Correlation is the optimum method in real-time applications, in the case of a high sampling frequency, followed by Recurrence Plot Analysis.","PeriodicalId":315050,"journal":{"name":"Journal of Military Technology","volume":"330 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134234232","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}
Alexandru Savastre, Cătălin Fățilă, Irina Cârceanu, Adrian Bolojan
Digital Object Identifier 10.32754/JMT.2020.2.06 37 1 Abstract—The present study is based on calculation of drag shape index and drag coefficient for three different geometrical configurationsfor a ballistic cap intended to be mounted over a 30 mm AP-T Naval projectile. The calculations are made in PROTech numerical application under the influence of three laws of resistance (Law 1930, Law 1943 and Siacci’s Law) for Mach number values which vary from 0.1 to 4, with the main purpose of choosing the best geometrical shape from the proposed forms of ballistic caps.
{"title":"Theoretical Evaluation of Drag Coefficient for Different Geometric Configurations of Ballistic Caps for an Experimental 30×165 mm AP-T Projectile","authors":"Alexandru Savastre, Cătălin Fățilă, Irina Cârceanu, Adrian Bolojan","doi":"10.32754/JMT.2020.2.06","DOIUrl":"https://doi.org/10.32754/JMT.2020.2.06","url":null,"abstract":"Digital Object Identifier 10.32754/JMT.2020.2.06 37 1 Abstract—The present study is based on calculation of drag shape index and drag coefficient for three different geometrical configurationsfor a ballistic cap intended to be mounted over a 30 mm AP-T Naval projectile. The calculations are made in PROTech numerical application under the influence of three laws of resistance (Law 1930, Law 1943 and Siacci’s Law) for Mach number values which vary from 0.1 to 4, with the main purpose of choosing the best geometrical shape from the proposed forms of ballistic caps.","PeriodicalId":315050,"journal":{"name":"Journal of Military Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134641827","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}
1Abstract—The paper aims to compare the two main design norms used in Romania for the dimensioning and verification of timber structural elements, namely NP 005 and Eurocode 5, highlighting the advantages and the disadvantages of each norm in comparison to each other, as well as their common points. An application was solved using both design norms for the case of elements subjected to compression parallel to the fibers. Since the design methods differ greatly one with respect to the other, a strict comparison of the obtained results could not be performed per element. Thus, multiple sets of data were introduced for the dimensions of the cross-section resulting in 34 distinct possible area combinations and three heights for the column were chosen, thus affecting the buckling length. For all these combinations only eight principle slenderness coefficients were found. Multiple sets of data were chosen for the forces acting on the timber element in order to see which possible combinations would yield valid results, without the need to resize the element. A matrix solution and representation were found.
{"title":"Comparison of the Design Norms NP005/2003 and EUROCODE 5. Elements Subjected to Compression Parallel to the Fibers","authors":"Patricia Murzea, M. Lupoae, D. Buliga","doi":"10.32754/JMT.2020.2.01","DOIUrl":"https://doi.org/10.32754/JMT.2020.2.01","url":null,"abstract":"1Abstract—The paper aims to compare the two main design norms used in Romania for the dimensioning and verification of timber structural elements, namely NP 005 and Eurocode 5, highlighting the advantages and the disadvantages of each norm in comparison to each other, as well as their common points. An application was solved using both design norms for the case of elements subjected to compression parallel to the fibers. Since the design methods differ greatly one with respect to the other, a strict comparison of the obtained results could not be performed per element. Thus, multiple sets of data were introduced for the dimensions of the cross-section resulting in 34 distinct possible area combinations and three heights for the column were chosen, thus affecting the buckling length. For all these combinations only eight principle slenderness coefficients were found. Multiple sets of data were chosen for the forces acting on the timber element in order to see which possible combinations would yield valid results, without the need to resize the element. A matrix solution and representation were found.","PeriodicalId":315050,"journal":{"name":"Journal of Military Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122309934","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}
Digital Object Identifier 10.32754/JMT.2020.2.08 49 1Abstract—Under the new eIDAS Regulation qualified electronic signatures are equivalent, from a legal stand, to handwritten signature. Traditional signature solutions make use of cryptographic materials stored in secure devices in possession of clients, while remote or cloud signatures solutions rely on a trusted service provider which manages the private keys and produces signatures in a remote manner. This shifts the weight of dealing with the keys off clients and moves this duty to a specialist in the field. As opposed to a classical Qualified Electronic Signature, a cloud-based solution has to solve a set of specific problems: the integrity of the data submitted must be ensured, the user’s intent of creating a digital signature must be demonstrated and the owner of the cryptographic key must be the only entity capable of using this cryptographic material. A device centric solution based on a simple mobile device application is proposed. This solution leverages the advancements in device technology such as the inclusion of Trusted Execution Environments (TEEs) on end user terminals. Furthermore, in comparison to similar solutions, the costs have been reduced by replacing cryptographic solutions based on SMS messages or cryptographic tokens with a device native implementation.
{"title":"Device Centric Cloud Signature Solution under eIDAS Regulation","authors":"P. Scurtu, V. Patriciu","doi":"10.32754/JMT.2020.2.08","DOIUrl":"https://doi.org/10.32754/JMT.2020.2.08","url":null,"abstract":"Digital Object Identifier 10.32754/JMT.2020.2.08 49 1Abstract—Under the new eIDAS Regulation qualified electronic signatures are equivalent, from a legal stand, to handwritten signature. Traditional signature solutions make use of cryptographic materials stored in secure devices in possession of clients, while remote or cloud signatures solutions rely on a trusted service provider which manages the private keys and produces signatures in a remote manner. This shifts the weight of dealing with the keys off clients and moves this duty to a specialist in the field. As opposed to a classical Qualified Electronic Signature, a cloud-based solution has to solve a set of specific problems: the integrity of the data submitted must be ensured, the user’s intent of creating a digital signature must be demonstrated and the owner of the cryptographic key must be the only entity capable of using this cryptographic material. A device centric solution based on a simple mobile device application is proposed. This solution leverages the advancements in device technology such as the inclusion of Trusted Execution Environments (TEEs) on end user terminals. Furthermore, in comparison to similar solutions, the costs have been reduced by replacing cryptographic solutions based on SMS messages or cryptographic tokens with a device native implementation.","PeriodicalId":315050,"journal":{"name":"Journal of Military Technology","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123441119","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}
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