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2020 Advances in Science and Engineering Technology International Conferences (ASET)最新文献

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Gas Centered Swirl Co-Axial (GCSC) injectors relevant to rocket propulsion applications 与火箭推进应用相关的气体中心旋流同轴喷射器
Pub Date : 2020-02-01 DOI: 10.1109/ASET48392.2020.9118284
K. S. Siddharth
Atomization is the process of fragmenting bulk liquid into smaller droplets. Gas Centered Swirl Co-axial (GCSC) injectors belong to the class of air assisted injectors wherein atomization proceeds by the relative motion between an swirling annular liquid sheet and a fast moving central on its inside. These class of injectors are relevant in rocket propulsion applications due to the high gas to fuel momentum ratios. Experimental and analytical research have been done with GCSC injectors over the past few decades. The current study is an attempt to review the important works done till date on GCSC injectors with primary focus on the atomization performance of the class of injectors over a range of operating conditions.
雾化是将散装液体破碎成较小液滴的过程。气体中心旋流同轴喷油器(GCSC)属于一类空气辅助喷油器,其中雾化是通过旋转的环形液体片与其内部快速运动的中心之间的相对运动进行的。这类喷射器由于具有较高的气燃动量比而与火箭推进应用密切相关。在过去的几十年里,对GCSC注射器进行了实验和分析研究。目前的研究试图回顾迄今为止在GCSC喷射器上所做的重要工作,主要关注该类喷射器在一系列操作条件下的雾化性能。
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引用次数: 1
Cooling of Hot Steel Plate on Run-Out Table Facility; a Simulation 滚边台设备上热钢板的冷却一个模拟
Pub Date : 2020-02-01 DOI: 10.1109/ASET48392.2020.9118381
Uzair Ali, O. Mohamad, M. Khan, M. Gadala
This work presents the various steps involved in performing finite element analysis of computational fluid mechanics system to simulate water impingement on a hot plate for a run-out table experiment. The analysis is conducted for half the plate during the cooling process due to symmetry. The steps include creating a modelling plan, material selection, geometric modelling, model meshing, applying boundary conditions, and obtaining the final temperatures of the steel plate and environment. The software used to conduct the finite element analysis is ANSYS Fluent.
本文介绍了计算流体力学系统进行有限元分析以模拟水对热板的冲击的各个步骤。在冷却过程中,由于对称的原因,对一半的板进行了分析。步骤包括创建建模计划,材料选择,几何建模,模型网格划分,应用边界条件,并获得钢板和环境的最终温度。进行有限元分析的软件为ANSYS Fluent。
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引用次数: 0
Effect of Aging Treatment on the Initiation and Propagation of Fatigue Cracks in the Ti-15V-3Al-3Sn-3Cr Metastable β Titanium Alloy 时效处理对Ti-15V-3Al-3Sn-3Cr亚稳β钛合金疲劳裂纹萌生和扩展的影响
Pub Date : 2020-02-01 DOI: 10.1109/ASET48392.2020.9118214
N. Yumak, K. Aslantaş, W. Ahmed
The scope of this study is the investigation of the effect of microstructure on fatigue behavior of Ti-15V-3Al-3Sn-3Cr (Ti 15–3) metastable beta titanium alloy. Aging treatment was applied to Ti 15–3 alloy at low and high aging temperatures. The fatigue crack initiation and propagation behavior of the alloy was determined by applying fatigue crack propagation tests under constant amplitude loading. Fatigue crack propagation in the solution treated sample showed a propagation due to grain boundaries, while the aging treated samples were affected by the homogeneous distribution and size of the $a$ phases. The fatigue crack propagation rate decreased with increasing aging time due to the formation of $a$ phases at low temperatures for long periods. At high aging temperatures, the increase in the aging time caused the $a$ phases to grow and the $a$ platelets amount to decrease. This situation created an inhomogeneous distribution of $a$ phases in the microstructure and adversely affected the fatigue behavior of the sample. The highest rate of fatigue crack propagation was observed in 450°C 10 hour sample, while the lowest rate of fatigue crack propagation was obtained in 300°C 10 hours sample.
本研究的范围是研究微观组织对Ti- 15v - 3al - 3sn - 3cr (Ti 15-3)亚稳β钛合金疲劳行为的影响。对Ti 15-3合金进行了低时效和高时效处理。通过恒幅载荷下的疲劳裂纹扩展试验,确定了合金的疲劳裂纹萌生和扩展行为。固溶处理试样的疲劳裂纹扩展表现为晶界扩展,时效处理试样的疲劳裂纹扩展则受$a$相的均匀分布和尺寸的影响。随着时效时间的延长,疲劳裂纹扩展速率降低,这是由于长时间低温下形成的$a$相。在高时效温度下,时效时间的延长导致$a$相增多,$a$血小板数量减少。这种情况造成了微观结构中$a$相的不均匀分布,并对样品的疲劳行为产生了不利影响。450℃10 h时疲劳裂纹扩展速率最高,300℃10 h时疲劳裂纹扩展速率最低。
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引用次数: 4
UAE's Entry into the Space League: Analysing the Legal Spectrum 阿联酋进入太空联盟:法律光谱分析
Pub Date : 2020-02-01 DOI: 10.1109/ASET48392.2020.9118298
S. Sethu
UAE's National Space Strategy 2030 is in alliance with the country's policies and national strategy and aims to achieve its vision in the various area of explorations of space, space-technologies and space-innovations. Along with this, UAE has come up with their space policy and is in the process of finalising their space sector law and space regulations. UAE is also a State party to three of the main international space law treaties. The country is seeking to establish itself as a major player globally and create a hub for space science and technology. To achieve this, the country has already began investing in capability building and also creating a conducive environment- scientific, legal and financial, which can attract future space projects and encouraging large scale investment both in public and private sectors. In this back drop it is pertinent to analyse the international obligations that UAE have under the various space treaties, conventions and norms which it has committed to abide by.
阿联酋的《2030年国家空间战略》与该国的政策和国家战略相一致,旨在实现其在空间探索、空间技术和空间创新等各个领域的愿景。与此同时,阿联酋已经提出了他们的空间政策,并正在最终确定他们的空间部门法律和空间法规。阿联酋也是三个主要国际空间法条约的缔约国。中国正在寻求成为全球主要参与者,并创建空间科学和技术中心。为了实现这一目标,该国已经开始投资于能力建设,并创造一个有利的环境——科学、法律和金融环境,这可以吸引未来的空间项目,并鼓励在公共和私营部门进行大规模投资。在这篇背景文章中,有必要分析阿联酋根据其承诺遵守的各种空间条约、公约和规范所承担的国际义务。
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引用次数: 0
On the use of additive manufacturing for mechanical performance assessment of engineering materials: a review 增材制造技术在工程材料力学性能评价中的应用综述
Pub Date : 2020-02-01 DOI: 10.1109/ASET48392.2020.9118389
A. Rahmani, A. Mourad
The objective of this paper is to review the recent work in which Additive Manufacturing AM (3D printing) techniques are used in the mechanical characterization of several engineering materials, e.g., metallic, ceramic, composite and polymeric. The investigations adopted by several researchers are reviewed to demonstrate the applicability and validity of AM techniques in replicating the used complex specimens' geometry. The research concluded that additive manufacturing opens doors to solving many research questions and challenges and significantly improves the cost-effectiveness and time factor of the current standard and nonstandard tests. It can provide both the dimensional accuracy of specimens as well as producing accurate internal flaws or profiles that affect the performance of a material.
本文的目的是回顾最近的工作,其中增材制造AM (3D打印)技术用于几种工程材料的机械特性,如金属,陶瓷,复合材料和聚合物。本文回顾了几位研究人员所做的调查,以证明增材制造技术在复制使用的复杂样品几何形状方面的适用性和有效性。研究得出结论,增材制造为解决许多研究问题和挑战打开了大门,并显著提高了当前标准和非标准测试的成本效益和时间因素。它既可以提供样品的尺寸精度,也可以产生影响材料性能的准确的内部缺陷或轮廓。
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引用次数: 2
Effect of Hybridization on the Tensile Behavior of Fabric Reinforced Polymer Composites - A Finite Element Analysis 杂化对织物增强聚合物复合材料拉伸性能的影响——有限元分析
Pub Date : 2020-02-01 DOI: 10.1109/ASET48392.2020.9118350
Dr. Clifton Stephen, Shivamurthy Basavanna, R. Selvam
In this study tensile test simulations were conducted on fiber reinforced polymer composites of different fabric combinations using ANSYS Workbench 16.0 software platform. Hybrid and Non-hybrid composite laminates were modeled using Kevlar, Carbon and E-glass fabrics as reinforcement and Epoxy LY564/Aradur 2954 formulation was used as the matrix mixture. Tensile tests simulations were conducted on the specimen according to ASTM D3039 standards. The effect of hybridization on the Specific Strength and Specific Modulus of the composite laminates were compared. From the results it was observed that Carbon/Kevlar/Epoxy laminate specimen was ideal for structural applications where high Sp. Strength and high Sp. Modulus is required.
采用ANSYS Workbench 16.0软件平台对不同织物组合的纤维增强聚合物复合材料进行拉伸试验模拟。以凯夫拉纤维、碳纤维和e -玻璃纤维为增强纤维,环氧树脂LY564/Aradur 2954配方为基体混合物,对混杂和非混杂复合材料层合板进行了建模。按照ASTM D3039标准对试件进行拉伸模拟试验。比较了杂化对复合材料层合板比强度和比模量的影响。从结果可以看出,碳/芳纶/环氧树脂层压试样是理想的结构应用中,高Sp.强度和高Sp.模量是必需的。
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引用次数: 2
Effect of hierarchical features on the critical buckling strength of periodic cellular solids 分层特征对周期性多孔固体临界屈曲强度的影响
Pub Date : 2020-02-01 DOI: 10.1109/ASET48392.2020.9118175
Noureldeen Al Tamimi, M. Alkhader, Basit Ali, M. Nazzal
Periodic cellular solids, due to their ability to provide high stiffness and strength to weight ratios, have become common in engineering applications requiring weight minimization. Such applications relate to aerospace, marine, renewable energy, and automotive industries. The continuously increasing industrial relevance of periodic cellular solids has motivated developing methodologies to improve their elastic and failure properties. Introducing hierarchical features in periodic cellular solids proved as one of the most effective methods to improve their in-plane elastic and strength properties. This approach was applied to aluminum honeycombs and resulted in more than doubling their in-plane stiffness. However, the effect of introducing hierarchical features on the out-of-plane properties of periodic cellular solids in general and honeycombs in particular has not been fully investigated yet. Accordingly, this work investigates the effect of introducing hierarchical features on the out-of-plane behavior of honeycombs. In particular, this work investigates, using finite element computations, the effect of introducing hierarchy on the buckling strength of hexagonal honeycombs. Results show that hierarchy when carefully introduced, can enhance the buckling strength of honeycombs by more than 170% without increasing their weight.
周期性细胞状固体,由于其能够提供高刚度和强度重量比,在需要重量最小化的工程应用中已经变得很常见。这些应用涉及航空航天、海洋、可再生能源和汽车工业。周期性细胞状固体的工业相关性不断提高,促使开发方法来改善其弹性和破坏特性。在周期孔状固体中引入分层特征是改善其面内弹性和强度性能的最有效方法之一。将这种方法应用于铝蜂窝,结果使其面内刚度增加了一倍以上。然而,引入层次特征对周期性蜂窝固体的面外性质的影响,特别是蜂窝的面外性质尚未得到充分的研究。因此,本研究探讨了引入层次特征对蜂窝离面行为的影响。特别地,本工作利用有限元计算研究了引入层次结构对六边形蜂窝结构屈曲强度的影响。结果表明,在不增加蜂窝重量的情况下,精心引入层次结构可以使蜂窝的屈曲强度提高170%以上。
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引用次数: 1
Modified Asymmetric Time-varying Coefficient of Particle Swarm Optimization 改进的非对称时变系数粒子群优化算法
Pub Date : 2020-02-01 DOI: 10.1109/ASET48392.2020.9118366
M. Al-Shabi, C. Ghenai, M. Bettayeb
In this paper, a new modification for particle swarm optimization (PSO) is developed. It has been found previously that making the learning coefficients of PSO variable enhances the performance in terms of convergence rate and obtaining the global minima solution. This has inspired a lot of researchers that investigated the effect of the coefficient's behavior on the PSO performance. However, the works in this field is still limited. This work presents a novel idea of using asymmetric curve of the modified PSO to represent the coefficient behavior. The method is tested and compared to previously reported techniques. The results are promising compared to most common methods in the field.
本文提出了一种新的粒子群优化算法。前人的研究发现,将PSO的学习系数设置为变量可以提高其收敛速度和全局最小解的性能。这启发了许多研究人员研究系数的行为对PSO性能的影响。然而,这一领域的工作仍然有限。本文提出了一种利用改进粒子群的非对称曲线来表示系数行为的新思路。对该方法进行了测试,并与先前报道的技术进行了比较。与该领域最常见的方法相比,结果是有希望的。
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引用次数: 10
Emerging Approaches for Estimation of Post-Mortem Interval in Medico-Legal Practice 法医学实践中估计死亡时间间隔的新方法
Pub Date : 2020-02-01 DOI: 10.1109/ASET48392.2020.9118325
M. Hachem, Hia Basem Said, S. Zakkir, A. John, A. Salim, Alia Sabri Alkash, D. Jimmy
Time since death TSD or Post-Mortem Interval PMI is the estimated time between death and discovery of the cadaver. Estimation of PMI is very challenging in medico-legal investigations for over years. Numerous methods have been proposed to estimate PMI. The aim of the present review was to explore the early changes of body after death named postmortem changes and the body decomposition after death. Emerging technologies for PMI estimation including the measurement of body temperature, the electrical and mechanical stimulation, the entomology and the post-mortem biochemical changes in body fluids were also discussed. We focused on the biochemical changes related to enzymes and proteins happening after death in the biological fluids and body tissues. Altogether, this review provides better understanding on the emerging technologies in PMI estimation which could be helpful for law enforcement and authorities in the community.
死亡后时间TSD或Post-Mortem Interval PMI是死亡和发现尸体之间的估计时间。多年来,在医学法律调查中,对PMI的估计是一个非常具有挑战性的问题。已经提出了许多估算PMI的方法。本综述的目的是探讨死亡后身体的早期变化,即死后变化和死亡后的身体分解。讨论了包括体温测量、电刺激和机械刺激、昆虫学和死后体液生化变化在内的新兴PMI估计技术。我们重点研究了死亡后生物体液和机体组织中与酶和蛋白质相关的生化变化。综上所述,本文对PMI估算中的新兴技术提供了更好的理解,可以为社区执法和当局提供帮助。
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引用次数: 0
Graphene Sensor for Scale Monitoring Applications in Oil Pipelines 石墨烯传感器在石油管道水垢监测中的应用
Pub Date : 2020-02-01 DOI: 10.1109/ASET48392.2020.9118330
A. Bouchalkha, R. Karli, Khalid Alhammadi
In this paper we focus on the design and testing of a graphene based sensor for applications in oil industry. The sensor is designed to target the specific need of the oil industry related to monitoring and preventing scale formation in oil pipelines. The graphene sensor was setup for resistance measurements using four-probe technique. It was tested on deionized (DI) water as a standard reference and crude oil as a harch, mixed, and inhomogenious environment. After the calibration tests, the graphene sensor was used to monitor the concentration of strontium ions in DI water as one of the key elements responssible for scale formation in oil pipelines. We have successfully achieved a sensitivity of 68% to 0.02MoI/L of Sr. ions concentration in DI water. The results obtained were consistent for several hours of measurements and even after 2 days the sensitivity is still about 36%.
在本文中,我们专注于设计和测试一种基于石墨烯的传感器,用于石油工业。该传感器是针对石油行业监测和防止石油管道结垢的特定需求而设计的。石墨烯传感器采用四探针技术进行电阻测量。以去离子水为标准参比,原油为混杂不均匀环境进行了测试。通过标定试验,将石墨烯传感器用于监测去离子水中锶离子的浓度,锶离子是导致输油管道结垢的关键因素之一。我们已经成功地实现了68%的灵敏度为0.02MoI/L的sr离子浓度在DI水中。几个小时的测量结果是一致的,即使在2天后,灵敏度仍然在36%左右。
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引用次数: 1
期刊
2020 Advances in Science and Engineering Technology International Conferences (ASET)
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