Defence Science Journal最新文献_第7页

Investigation of the Effect of Various Types and Features of Grooved Barrels on the Range of Firearms 凹槽枪管的不同类型和特点对武器射程影响的研究

IF 0.9 4区工程技术

Defence Science Journal Pub Date : 2023-03-13 DOI: 10.14429/dsj.73.18000

H. Pihtili, R. Yildirim

引用次数: 0

Life Cycle Assessment Based Analysis of Water Bottle Designs for Defence Application 基于生命周期评估的国防水瓶设计分析

IF 0.9 4区工程技术

Defence Science Journal Pub Date : 2023-03-13 DOI: 10.14429/dsj.73.18341

Vidya Shanker Pandey, A. Agrawal, A. Dubey

{"title":"Life Cycle Assessment Based Analysis of Water Bottle Designs for Defence Application","authors":"Vidya Shanker Pandey, A. Agrawal, A. Dubey","doi":"10.14429/dsj.73.18341","DOIUrl":"https://doi.org/10.14429/dsj.73.18341","url":null,"abstract":"This paper presents the successful implementation of the Life Cycle Assessment (LCA) approach for the sustainable development of a defence product. Alternative designs of this product are evaluated from the environmental burden perspective. The products considered are water bottles used by the armed forces in places like the Siachen glacier, where the environmental factors are of great concern. From the environmental degradation perspective, the suitability of three existing bottle types has been analysed using LCA and Life Cycle Impact Assessment (LCIA) approaches on SimaPro software for each of its components and the bottle as a whole. Using this software, uncertainty analysis has also been carried out by conducting a Monte Carlo simulation for a reasonable confidence level. The latest design was found to have the least environmental burden, being 82.62% less compared to the first design. To augment the environmental performance further, the best design was again reviewed by carrying out component level analysis to identify feasible alternative materials that would be functionally equivalent but with lower environmental impact. It suggested switching to lower impact material for the cap and cap cover for the proposed design. With the adoption of the changed material, the environmental performance improved by 10.61 % as compared to the best design and 84.46 % compared to the earliest design. ","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46643235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

High Temperature Resistant Coatings for Strategic Aero space Applications 战略航空航天应用的耐高温涂层

4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18638

Zafir Alam, Chandrakant Parlikar, Mahesh Kumawat, S. Gokul Lakshmi, Dipak Das

{"title":"High Temperature Resistant Coatings for Strategic Aero space Applications","authors":"Zafir Alam, Chandrakant Parlikar, Mahesh Kumawat, S. Gokul Lakshmi, Dipak Das","doi":"10.14429/dsj.73.18638","DOIUrl":"https://doi.org/10.14429/dsj.73.18638","url":null,"abstract":"The aerospace components operating in hot sections of aero-engines and combustors experience extreme environments. Typically, the components are subjected to high service temperatures exceeding 1100°C and oxidizing conditions. Protective coatings are essential for preventing oxidation-induced dimensional degradation of the components and enhancing their high temperature capability as well as durability. Defence Metallurgical Research Laboratory (DMRL) has developed a variety of metallic and ceramic thermal barrier coating (TBC) systems for Ni-base superalloys, and refractory Nb-alloys for strategic aerospace applications involving ultra-high temperatures and high flow velocities. These coatings have demonstrated significant effectiveness against thermal degradation at temperatures as high as 2000 °C during oxidation in static air as well as in dynamic conditions involving high flow velocities (Mach > 2). The present article provides an overview of the advanced oxidation resistant and thermal barrier coatings developed in DMRL. The effectiveness of the TBCs in preventing dimensional degradation of the metallic and composite substrate materials has been evaluated at the laboratory scale. The developed TBCs have the potential for use in aero-engines and propulsion systems of hypervelocity vehicles.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136179612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Innovative Isostatic Processing Technologies for Defence and other Strategic Applications 国防和其他战略应用的创新等静力处理技术

4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18636

G. Appa Rao, Vijay Pal Shivran, Dhirendra Sahu, B. Sreenu

引用次数: 0

Ballistic Efficacy of Carbide Free High Strength Nano Structured Bainitic Armour Steels 无碳化物高强度纳米结构贝氏体装甲钢的弹道效能

4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18634

Bidyapati Mishra, G Sukumar, P P Senthil, P R S Reddy, B B Singh, B Ramakrishna, K Siva Kumar, V Madhu

{"title":"Ballistic Efficacy of Carbide Free High Strength Nano Structured Bainitic Armour Steels","authors":"Bidyapati Mishra, G Sukumar, P P Senthil, P R S Reddy, B B Singh, B Ramakrishna, K Siva Kumar, V Madhu","doi":"10.14429/dsj.73.18634","DOIUrl":"https://doi.org/10.14429/dsj.73.18634","url":null,"abstract":"Carbide free nano-structured bainitic steels typically have strength more than 2.0 GPa and impact toughness of 7 J or less. Most of this class of steels have sluggish kinetics and takes 16-72 h for complete bainitic transformation. The present work discusses key perspectives in developing carbide free nano-structured bainitic steel having strength more than 2.0 GPa and toughness more than 15 J. Further, ballistic evaluation of newly developed carbide free nano-structured bainitic steels having strength more than 2.0 GPa and high toughness of 20 J was carried out to understand the adaptability of these steels in combat vehicle applications. A comparison is made between newly developed high strength and tough carbide free nano-structured bainitic steels with typical martensite based ARMOX 500 class of armour steels. The developed nano-structured bainite showed ballistic performance much superior to ARMOX 500 steel. Monolithic plates of bainite provide complete protection against 7.62 AP projectiles at an areal density of 120 kgm-2. The ballistic efficiency of monolithic plates was further enhanced by using perforated geometrical configurations.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136179459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effect of Vanadium Addition On Structure And Soft Magnetic Properties of Nanocrystalline FeCoZrBCu Melt Spun Alloys 钒对纳米晶FeCoZrBCu熔体纺丝合金结构和软磁性能的影响

4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18721

D Atchyut Kumar, Saijyothi Nagireddi, D Arvindha Babu, J Arout Chelvane, M Manivel Raja, T K Nandy

{"title":"Effect of Vanadium Addition On Structure And Soft Magnetic Properties of Nanocrystalline FeCoZrBCu Melt Spun Alloys","authors":"D Atchyut Kumar, Saijyothi Nagireddi, D Arvindha Babu, J Arout Chelvane, M Manivel Raja, T K Nandy","doi":"10.14429/dsj.73.18721","DOIUrl":"https://doi.org/10.14429/dsj.73.18721","url":null,"abstract":"In this report, glass forming ability, structure and soft magnetic properties of melt spun ribbons of (Fe1-xCox) 88-yVyZr7B4Cu1alloys with compositions x0.1y2, x0.1y4 and x0.1y6 & x0.35y2, x0.35y4 and x0.35y6 have been investigated. All alloys were found to be fully amorphous after melt spinning. Annealing of amorphous ribbons of x0.1 series alloys leads to the formation of bcc α-Fe(Co) phase and Fe2Zr phase in the amorphous matrix, while annealing of amorphous ribbons of x0.35 series alloys, leads to the formation of only bcc α-Fe(Co) phase in the amorphous matrix. High precision lattice parameter calculation revealed that V addition influences the phase formation in low Co containing x0.1 alloys. It leads to low volume fraction of bcc α-Fe(Co) phase and promotes Fe2Zr phase. A higher Co content increases the Curie temperature of amorphous phase, while V addition decreases the TC of amorphous phase in both x0.1 and x0.35 series of alloys. Saturation magnetization (Ms) of x0.35 alloys are higher than of x0.1 alloy due to higher Co content and the Ms decreases with increasing V content due to its non-magnetic nature. Coercivity was found to be increased with annealing in x0.35 alloys due to the low volume fraction formation of bcc α-Fe(Co) phase and Fe2Zr phase. The coercivity decreases with increasing V addition in x0.35 alloys as spun ribbons and a lowest coercivity of 0.13 Oe has been obtained in x0.35y6 alloy which is one of the lowest among FeCoZrBCu alloys reported.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136179463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Formal Modelling and Verification of the Clock Synchronization Algorithm of FlexRay FlexRay时钟同步算法的形式化建模与验证

IF 0.9 4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18449

Shimmi Asokan, K.H. Kochaleema, G. Santhosh Kumar

{"title":"Formal Modelling and Verification of the Clock Synchronization Algorithm of FlexRay","authors":"Shimmi Asokan, K.H. Kochaleema, G. Santhosh Kumar","doi":"10.14429/dsj.73.18449","DOIUrl":"https://doi.org/10.14429/dsj.73.18449","url":null,"abstract":"\u0000 \u0000 \u0000 \u0000The hundreds of electronic control devices used in an automotive system can effectively communicate with one another, thanks to an in-vehicle network (IVN) like FlexRay. Even though every node in the network will be running on its local clock, a global notion of time is essential. The clock synchronisation algorithm accomplishes this global time between the nodes in FlexRay. In this era of self-driving cars, the vehicle’s safety is paramount. For the vehicle to operate safely and smoothly, timely communication of information is critical, and the clock synchronisation algorithm plays a vital role in this. It is essential to formally test the clock synchronisation algorithm’s correctness. This paper attempts to model and verify the clock synchronisation algorithm of FlexRay using formal methods, which in turn enhance the reliability of safety-critical automotive systems. The clock synchronisation is modelled as a network of six timed automata in the UPPAAL model checker. Three system models were developed, a model for an ideal clock, another for a drifting clock, and a third model considering propagation delay. The precision of the clocks is verified to be within the prescribed limits. Simulation studies are also conducted on the model to ensure that the clock’s drift is always within the precision. \u0000 \u0000 \u0000 \u0000","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47982589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructure and Mechanical Properties of Tungsten Heavy Alloy Prepared Using Tungsten Metal Powder Produced from Heavy Alloy Scrap 用重合金废钨金属粉制备重合金的组织与力学性能

4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18722

U. Ravi Kiran, Ashutosh Panchal, S.S. Kalyan Kamal, K. K. Sahu, D. Mishra, T. K. Nandy, Ch.R.V.S. Nagesh

{"title":"Microstructure and Mechanical Properties of Tungsten Heavy Alloy Prepared Using Tungsten Metal Powder Produced from Heavy Alloy Scrap","authors":"U. Ravi Kiran, Ashutosh Panchal, S.S. Kalyan Kamal, K. K. Sahu, D. Mishra, T. K. Nandy, Ch.R.V.S. Nagesh","doi":"10.14429/dsj.73.18722","DOIUrl":"https://doi.org/10.14429/dsj.73.18722","url":null,"abstract":"Tungsten metal powder, using a hydrometallurgical route, was extracted from tungsten heavy alloy scrap that was generated during machining of penetrator cores for the manufacture of Fin Stabilised Armour Piercing Discarding Sabot (FSAPDS). The powder was subjected to extensive characterisation that included physical property evaluation and analysis of the alloy chemistry in order to assess its suitability for the preparation of tungsten heavy alloys with enhanced mechanical properties. Subsequently, a tungsten heavy alloy based on W-Ni-Co was consolidated using this powder through liquid phase sintering followed by heat treatment and swaging operations to realize long rods (~500 mm). This was followed by a detailed characterisation that included microstructure and mechanical property. The mechanical properties of these rods are promising, exhibiting a good balance of tensile and impact properties, which in turn underscores the potential of these recycled powders in the production of premium quality heavy alloy long rods for stringent applications such as kinetic energy penetrators.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136179464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of Pleated Discrete Pore Non Woven Layer Type Filter Element for Naval Applications 海军用褶皱离散孔无纺布滤芯的分析

IF 0.9 4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18120

PS Chenthil Prabu, C. Vamsi Krishna, S. Nagesh, RP Chandrasekhar, R. Murugesan

{"title":"Analysis of Pleated Discrete Pore Non Woven Layer Type Filter Element for Naval Applications","authors":"PS Chenthil Prabu, C. Vamsi Krishna, S. Nagesh, RP Chandrasekhar, R. Murugesan","doi":"10.14429/dsj.73.18120","DOIUrl":"https://doi.org/10.14429/dsj.73.18120","url":null,"abstract":" In naval applications generally, the pleated discrete pore non-woven layer filter element is used. Filters used for such applications require maximized filtration rate, lower pressure drop, higher permeability, effective pore size distribution and good filtration efficiency. In other most common wire mesh filter element types, the geometric parameters are well defined and can easily be modelled. In the case of non-woven layer filter elements the pores are arranged in a randomly distributed manner and the modelling becomes difficult. In this present study a new approach was contemplated for modelling the same. The fluid flow through the filter element is by percolation phenomenon. Using Darcy’s law approach, the pressure drop across the filter element for different flow rates, were found analytically by considering the flow resistance in axial, radial and circumferential directions. The theoretical prediction made by CFD analysis is correlated with actual model behaviour and a good degree of correlation is obtained which shows the efficacy of this method for wider use in similar application. \u0000 \u0000 ","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46636903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Materials and Coatings for Defence Application 国防用材料和涂料

4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18849

Manish Roy

引用次数: 0