Defence Science Journal最新文献_第9页

Plastic Deformation of High Explosive Projectile 155 mm during Gun Launch Conditions using Finite Element Method 155mm高爆弹在火炮发射条件下的塑性变形有限元法

IF 0.9 4区工程技术

Defence Science Journal Pub Date : 2022-12-06 DOI: 10.14429/dsj.72.18197

Rajesh B. Ohol, B. Parate, D. Thakur

{"title":"Plastic Deformation of High Explosive Projectile 155 mm during Gun Launch Conditions using Finite Element Method","authors":"Rajesh B. Ohol, B. Parate, D. Thakur","doi":"10.14429/dsj.72.18197","DOIUrl":"https://doi.org/10.14429/dsj.72.18197","url":null,"abstract":"The structural integrity of artillery projectile 155mm high explosive Extended Range Full Bore (ERFB)boat tail designed for 155mm howitzer guns of 39, 45 and 52 calibre plays a key role inside the gun barrel. Thisprojectile comprises a shell body, a driving band, a boat tail, nubs, an explosive, and a fuze. Plastic deformationof the projectile and stripping of driving band are not permitted, when projectile is fired. An investigational study is necessitated to check the plastic deformation of the projectile subjected to maximum propellant charge pressure.The aim of this study is to check the effective plastic deformation and affirm the structural integrity. A 3-D explicit dynamic structural analysis of 155 mm HE ERFB BT during gun launch conditions is carried out by finite element method using FE code ABAQUS/Explicit. To understand the non-linear mechanical behavior of the projectile, the true stress-strain curves of the materials are considered. The plastic behavior of the projectile subjected to the time-dependent loading is studied by using the von Mises plasticity model. The results reveal that the shell body and boat tail have no plastic deformation and the most stressed component is the driving band. The investigation has affirmed the structural integrity of the projectile during gun launch conditions.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49604807","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

Optimal Design of Hydraulic Disc Brake for Magnetorheological (MR) Application 磁流变用液压盘式制动器的优化设计

IF 0.9 4区工程技术

Defence Science Journal Pub Date : 2022-12-06 DOI: 10.14429/dsj.72.18369

Danish Quamar, C. Sarkar

{"title":"Optimal Design of Hydraulic Disc Brake for Magnetorheological (MR) Application","authors":"Danish Quamar, C. Sarkar","doi":"10.14429/dsj.72.18369","DOIUrl":"https://doi.org/10.14429/dsj.72.18369","url":null,"abstract":"This paper aims to provide a new design considering compressive force application in the MR fluid andimprove its braking torque by optimizing it. According to the current study, compressing the MR region will increase braking torque compared to no compression. The area covered by an existing model of the conventional disc brake is taken into consideration for the unique design of the MR brake to operate in shear and compression mode, and the required compression given by the hydraulic pressure similar to a conventional disc brake. The suggested MR brake’s structural layout is presented. The Herschel-Bulkley shear thinning model’s mathematical expression for the torque equation for the compression and shear modes is provided. An analytical magnetic circuit is done for the proposed design for determining the relationship between applied current and magnetic field strength as a function of the geometrical and material attributes of the MR brake. Simulation is done on COMSOL software with the help of an AC/DC module, considering the non-linear relationship between the magnetic field and magnetic flux. Simulation results of braking torque achieved with the varying current are determined. The graph displays the braking torque for current in the compression plus shear mode as well as shear mode. After that, optimization is done on the proposed model for optimal design parameters. For optimization, we adopt the most popular Genetic Algorithm (GA) method. Optimization aims to increase the braking torque capacity of the MR brake for the given volume.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44806557","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

Reliability Analysis of Radiation Tolerant Low Voltage CCCII Circuit For Space Applications 空间用耐辐射低压CCCII电路可靠性分析

IF 0.9 4区工程技术

Defence Science Journal Pub Date : 2022-12-06 DOI: 10.14429/dsj.72.17583

A. Pathak, M. K. Tiwari, N. Pandey, S. K. Paul, Saiyid Mohammad Irshad Rizvi

{"title":"Reliability Analysis of Radiation Tolerant Low Voltage CCCII Circuit For Space Applications","authors":"A. Pathak, M. K. Tiwari, N. Pandey, S. K. Paul, Saiyid Mohammad Irshad Rizvi","doi":"10.14429/dsj.72.17583","DOIUrl":"https://doi.org/10.14429/dsj.72.17583","url":null,"abstract":"In this paper, the impact of radiation on the MOS devices is investigated on recently reported programmablesecond generation Current Controlled Conveyor (CCCII) wherein some updates are suggested to take Hot Carrier Injection, Bias Temperature Instability, and Time Dependent Dielectric Breakdown into account. As radiation is yet another important factor that causes change in threshold voltage, the transistors which are amenable to larger threshold shift and may lead to functional failure are identified first. Subsequently, three possibilities; uses of all thin oxide devices, all thick oxide devices, and mixed devices are being investigate and it is found that while using mixed devices, the circuit becomes functional at lower voltage without any effective increase in leakage current. Architecture is updated to enhance the performance of circuits under time-based ageing and radiation environment. The major challenge is to control dynamic leakage and radiative noise due to imposed radiation. All simulations are carried out using 28nm CMOS technology models in Cadence Virtuoso environment using ±1.0V supply voltage and results have been verified with post layout netlist. Proposed circuit can function at low voltage with the reduced degradation for 8 years at 25 °C consumes less area as compared to the existing CCCII circuit with 0.008 FIT value.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43511976","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

An Algorithm for Exchanging Target Asset Pairs using the Kidney Exchange Model 基于肾交换模型的目标资产对交换算法

IF 0.9 4区工程技术

Defence Science Journal Pub Date : 2022-12-06 DOI: 10.14429/dsj.72.18414

Eun-Jee Choi, Choonjoo Lee, Sungil Kim, Namsuk Cho

引用次数: 0

Effect of Aviation Turbine Fuel Exposure on Interlaminar and Inplane Shear Properties of Glass Fiber Reinforced Epoxy Composite 航空涡轮燃料暴露对玻璃纤维增强环氧树脂复合材料层间和层内剪切性能的影响

IF 0.9 4区工程技术

Defence Science Journal Pub Date : 2022-12-06 DOI: 10.14429/dsj.72.18238

S. Shrivastava, G. Ramarao, M. Buragohain, N. Selvaraj

{"title":"Effect of Aviation Turbine Fuel Exposure on Interlaminar and Inplane Shear Properties of Glass Fiber Reinforced Epoxy Composite","authors":"S. Shrivastava, G. Ramarao, M. Buragohain, N. Selvaraj","doi":"10.14429/dsj.72.18238","DOIUrl":"https://doi.org/10.14429/dsj.72.18238","url":null,"abstract":"This study investigated the effect of aviation turbine fuel exposure on interlaminar and in-plane shear properties of E-glass/epoxy composite. The two types of test specimens, namely bare and resin-coated specimens with varying thicknesses as per the ASTM standard, were made out of E-glass/epoxy composite to evaluate their interlaminar and in-plane shear properties. These all types of specimens were immersed inside the aviation turbine fuel for two months and then afterward their effect on the reduction of mechanical properties like interlaminar and in-plane shear tests properties were experimentally investigated. Test results show that ATF fuel exposure has reduced the interlaminar shear strength by 10.04 %, 7.83 %, and 6.01 % for bare, with 0.1 mm and 0.2 mm resin coating, respectively. Similarly, in-plane shear strength was reduced by 14.75 %, 11.22 %, and 7.52 % for bare, with 0.1 mm and 0.2 mm resin coating, respectively, and in-plane shear modulus was reduced by 10.87 %, 8.94 %, and 6.52 % for bare, with 0.1 mm and 0.2 mm resin coating conditions as compared to as-received (without ATF exposure) specimens.SEM micrographs and results too showed that properties were reduced and indicated that the glass/epoxycomposite was resistive to fuel ingression. It was observed that bare specimens exhibited a reduction in shearproperties due to ATF ingression to the polymeric network and induced internal stresses, which not only degraded the matrix and fiber-matrix adherence but created micro-cracks too in the resin at interfaces. Resin-coated specimens limit fuel ingression, which has led to a reduction in properties.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49635679","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

Solution of Large Sparse System of Linear Equations over GF(2) on a Multi Node Multi GPU Platform 多节点多GPU平台上GF(2)上大型稀疏线性方程组的求解

IF 0.9 4区工程技术

Defence Science Journal Pub Date : 2022-12-06 DOI: 10.14429/dsj.72.17656

S. Rawal, Indivar Gupta

{"title":"Solution of Large Sparse System of Linear Equations over GF(2) on a Multi Node Multi GPU Platform","authors":"S. Rawal, Indivar Gupta","doi":"10.14429/dsj.72.17656","DOIUrl":"https://doi.org/10.14429/dsj.72.17656","url":null,"abstract":"We provide an efficient multi-node, multi-GPU implementation of the Block Wiedemann Algorithm (BWA)to find the solution of a large sparse system of linear equations over GF(2). One of the important applications ofsolving such systems arises in most integer factorization algorithms like Number Field Sieve. In this paper, wedescribe how hybrid parallelization can be adapted to speed up the most time-consuming sequence generation stage of BWA. This stage involves generating a sequence of matrix-matrix products and matrix transpose-matrix products where the matrices are very large, highly sparse, and have entries over GF(2). We describe a GPU-accelerated parallel method for the computation of these matrix-matrix products using techniques like row-wise parallel distribution of the first matrix over multi-node multi-GPU platform using MPI and CUDA and word-wise XORing of rows of the second matrix. We also describe the hybrid parallelization of matrix transpose-matrix product computation, where we divide both the matrices row-wise into equal-sized blocks using MPI. Then after a GPU-accelerated matrix transpose-matrix product generation, we combine all those blocks using MPI_BXOR operation in MPI_Reduce to obtain the result. The performance of hybrid parallelization of the sequence generation step on a hybrid cluster using multiple GPUs has been compared with parallelization on only multiple MPI processors. We have used this hybrid parallel sequence generation tool for the benchmarking of an HPC cluster. Detailed timings of the complete solution of number field sieve matrices of RSA-130, RSA-140, and RSA-170 are also compared in this paper using up to 4 NVidia V100 GPUs of a DGX station. We got a speedup of 2.8 after parallelization on 4 V100 GPUs compared to that over 1 GPU.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47798539","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

Congestion Prediction in Internet of Things Network using Temporal Convolutional Network A Centralized Approach 基于时间卷积网络的物联网拥塞预测——一种集中式方法

IF 0.9 4区工程技术

Defence Science Journal Pub Date : 2022-12-06 DOI: 10.14429/dsj.72.17447

V. Jain, A. P. Mazumdar, M. C. Govil

{"title":"Congestion Prediction in Internet of Things Network using Temporal Convolutional Network A Centralized Approach","authors":"V. Jain, A. P. Mazumdar, M. C. Govil","doi":"10.14429/dsj.72.17447","DOIUrl":"https://doi.org/10.14429/dsj.72.17447","url":null,"abstract":"The unprecedented ballooning of network traffic flow, specifically, Internet of Things (IoT) network traffic, has big stressed of congestion on todays Internet. Non-recurring network traffic flow may be caused by temporary disruptions, such as packet drop, poor quality of services, delay, etc. Hence, the network traffic flow estimation is important in IoT networks to predict congestion. As the data in IoT networks is collected from a large number of diversified devices which have unlike format of data and also manifest complex correlations, so the generated data is heterogeneous and nonlinear in nature. Conventional machine learning approaches unable to deal with nonlinear datasets and suffer from misclassification of real network traffic due to overfitting. Therefore, it also becomes really hard for conventional machine learning tools like shallow neural networks to predict the congestion accurately. Accuracy of congestion prediction algorithms play an important role to control the congestion by regulating the send rate of the source. Various deeplearning methods (LSTM, CNN, GRU, etc.) are considered in designing network traffic flow predictors, which have shown promising results. In this work, we propose a novel congestion predictor for IoT, that uses Temporal Convolutional Network (TCN). Furthermore, we use Taguchi method to optimize the TCN model that reduces the number of runs of the experiments. We compare TCN with other four deep learning-based models concerning Mean Absolute Error (MAE) and Mean Relative Error (MRE). The experimental results show that TCN based deep learning framework achieves improved performance with 95.52% accuracy in predicting network congestion. Further, we design the Home IoT network testbed to capture the real network traffic flows as no standard dataset is available.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49585637","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

Wideband Fabric Antenna for Ultra Wideband Applications using for Medical Applications 用于医疗应用的超宽带应用的宽带织物天线

IF 0.9 4区工程技术

Defence Science Journal Pub Date : 2022-12-06 DOI: 10.14429/dsj.72.17919

S. Bhavani, T. Shanmuganantham

{"title":"Wideband Fabric Antenna for Ultra Wideband Applications using for Medical Applications","authors":"S. Bhavani, T. Shanmuganantham","doi":"10.14429/dsj.72.17919","DOIUrl":"https://doi.org/10.14429/dsj.72.17919","url":null,"abstract":"Traditional cancer detection imaging techniques suffer high costs, high false negatives, high false positives,and pain. The microwave imaging techniques overcome the limitations, which depend primarily on antenna design. If an antenna is wearable and implantable, the imaging system gives better results with less pain and cost. A wide band fabric antenna that operates at the ultra-wideband frequency with a low specific absorption rate (SAR) on breast phantom is verified. The proposed design has Jeans material as a substrate and the copper patch as a radiating element. The patch is designed in a circular shape with an M-type slot to suppress the spurious modes. The designed antenna model is commonly used for monitoring microwave imaging and has dimensions of 28X30X1.6 mm3. The proposed antenna design covers 2.3-8 GHz frequency with a broadside radiation pattern. The gain over the operating frequency is about 2.3-4.5 dB, and the efficiency is 55 %–79 %. The antenna model was designed and simulated in CST microwave studio. The performance of an antenna is tested on breast cancer to detect the presence of tumor cells in the breast. The antenna analysis on the phantom was done by considering the tumor location and corresponding results are presented. By varying the sizes of the tumor the antenna performance is analysed. The simulated SAR values of the proposed antenna design on breast phantom are under the limits of FCC.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44165022","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

Experimental Study on the Thermodynamic Damage Power of Ammunition Deflagration in a Closed Explosive Device 闭式爆炸装置中弹药爆燃热力毁伤威力的实验研究

IF 0.9 4区工程技术

Defence Science Journal Pub Date : 2022-12-06 DOI: 10.14429/dsj.72.18323

Liangquan Wang, F. Shang, D. Kong

引用次数: 0

Terrain Specific Real Time Pixelated Camouflage Texture Generation & its Impact Assessment 地形专用实时像素化伪装纹理生成及其影响评估

IF 0.9 4区工程技术

Defence Science Journal Pub Date : 2022-12-06 DOI: 10.14429/dsj.72.17599

Sachi Choudhary, Rashmi Sharma

引用次数: 0