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Frontiers in Automobile and Mechanical Engineering -2010最新文献

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Hydrogen storage in wind turbine tower — A review 风力发电塔架储氢技术综述
Pub Date : 2010-11-01 DOI: 10.1109/FAME.2010.5714852
B. R. Bapu, J. Karthikeyan, K. Reddy
Wind energy is clean, renewable, and often rises to the top of the list when considering “green” energy alternatives. Many challenging issues also arise when considering wind energy. The biggest issue, some say, is that wind energy is not reliable, dependable, or consistent enough to be taken seriously; any more than on small scale applications. Due to the inconsistent nature of wind, it cannot be a contributor for base load energy production. The industry has, and is currently addressing this issue of “intermittent” power generation from wind by means of energy storage. That is to say, produce the energy when the opportunity arises and store the energy for later use when demand levels increase. Energy storage technology has been continuously being developed for various types of renewable energy. The two primary energy platforms this applies to is wind and solar. Wind doesn't blow 24/7 nor does the sun always shine. In order to overcome these drawbacks, the following modifications requires in our traditional wind mill structure. a. By fixing solar strip over turbine blades, we could generate electricity when the wind turbine slows or stop. b. By placing hydrogen storage compartment in a turbine tower, the plant could produce hydrogen through an electrolyser when there is excess wind energy available, and then provide electricity to domestic customers via a fuel cell and a hydrogen combustion engine. The proposed solution will be especially useful in areas with insufficient power production or insufficient electricity infrastructure. For instance, stored hydrogen can be used to provide back-up/emergency power or to secure a more reliable and higher quality power supply.
风能是清洁的、可再生的,在考虑“绿色”能源替代方案时,风能经常排在首位。在考虑风能时,也会出现许多具有挑战性的问题。一些人说,最大的问题是风能不可靠,不可靠,也不稳定,不值得认真对待;至少在小规模应用中是如此。由于风的不稳定性,它不能成为基本负荷能源生产的贡献者。该行业已经并且目前正在解决通过储能方式从风能中“间歇性”发电的问题。也就是说,在机会出现时生产能源,并在需求增加时储存能源以供以后使用。针对各种类型的可再生能源,储能技术不断得到发展。这适用于两个主要的能源平台是风能和太阳能。风不会24小时不停地吹,太阳也不会永远照耀。为了克服这些缺点,需要对我国传统的风力发电机结构进行以下修改。通过在涡轮机叶片上固定太阳能条,我们可以在风力涡轮机减速或停止时发电。b.在涡轮机塔中放置储氢室,当有多余的风能可用时,可以通过电解槽产生氢气,然后通过燃料电池和氢燃烧发动机向国内用户提供电力。拟议的解决方案在电力生产不足或电力基础设施不足的地区将特别有用。例如,储存的氢气可用于提供备用/应急电源或确保更可靠和更高质量的电力供应。
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引用次数: 6
Mechanical and micro structural behavior of 2024–7075 aluminium alloy plates joined by friction stir welding 2024-7075铝合金搅拌摩擦焊连接板的力学和微观组织行为
Pub Date : 2010-11-01 DOI: 10.1109/FAME.2010.5714835
D. Muruganandam, S. Ravikumar, S. Das
The aim of the present work is to investigate on the mechanical and micro structural properties of dissimilar 2024 and 7075 aluminium plates joined by friction stir welding (FSW). The two plates, aligned with perpendicular longitudinal directions, have been successfully welded; successively, the welded plates have been tested under tension at room temperature in order to analyse the mechanical response with respect to the parent materials. The fatigue endurance (S-N) curves of the welded joints have been achieved, since the fatigue behaviour of light welded plates is the best performance indicator for a large part of industrial applications; a resonant electromechanical testing machine load and a constant load ratio R=σmin/σmax=0.1 have been used at a load frequency of about 75 Hz. The resulted microstructure due to the FSW process has been studied by employing optical and scanning electron microscopy either on ‘as welded’ specimens and on tested specimen after rupture occurred.
本研究的目的是研究2024和7075铝板搅拌摩擦焊接(FSW)连接的力学和微观组织性能。两板纵向垂直对齐,焊接成功;随后,在室温下对焊接板进行了拉伸试验,以分析其相对于母材的力学响应。由于轻焊接板的疲劳行为是大部分工业应用的最佳性能指标,因此获得了焊接接头的疲劳耐力(S-N)曲线;在75 Hz左右的载荷频率下,采用谐振式机电试验机载荷和恒定载荷比R=σmin/σmax=0.1。采用光学和扫描电子显微镜对焊接试样和断裂后的测试试样进行了研究。
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引用次数: 18
Characteristics of re-inforced Carbon-Carbon 增强碳-碳的特性
Pub Date : 2010-11-01 DOI: 10.1109/FAME.2010.5714791
K. Krishnasastry, V. Seshagirirao, S. Dhanalakshmi, K. Palanikumar
The Reinforced Carbon-Carbon (RCC) is gaining significant position among the materials of modern period. The light weight and high strength composite is finding its way in various applications of Bio, Medical, Space and Defence fields. The growing use of Carbon Fiber Reinforced Carbon (CFRC) composites as high performing material in aerospace and defence industries has prompted studies in developing technology for machining of these composites in recent years. This paper emphasizes the characteristics and importance of this unique material. The varied and wide applications of CFRC with case studies were discussed in this paper.
增强碳-碳材料(RCC)在现代材料中占有越来越重要的地位。轻质高强度复合材料在生物、医疗、航天和国防领域的各种应用中都有自己的应用。近年来,碳纤维增强碳纤维(CFRC)复合材料作为一种高性能材料在航空航天和国防工业中的应用日益广泛,促使人们研究开发这种复合材料的加工技术。本文强调了这种独特材料的特点和重要性。本文通过实例讨论了CFRC的广泛应用。
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引用次数: 4
Computational analysis for selection of Diesel Oxidation Catalyst and experimental investigation to meet BS-III/IV emission norms as low cost solution for LCV applications 柴油氧化催化剂选择的计算分析和满足BS-III/IV排放标准的实验研究,作为LCV应用的低成本解决方案
Pub Date : 2010-11-01 DOI: 10.1109/FAME.2010.5714806
S. Karthikeyan, S. Krishnan
Stricter emission standards are forcing automakers to couple the catalytic converters closer to the engine exhaust. Mounting the catalytic converter (DOC) at or near the exhaust manifold helps to reduce the increase in emission after a cold engine is started. The spike occurs because cold engines require a richer air-fuel mixture to run smoothly. The emission standards can be met only by appropriate design of catalytic converter along with the thin walled substrate for faster light off of the catalyst. Further the low exhaust gas temperature experienced on light commercial diesel vehicle present a very challenging environment for the successful operation of Diesel Oxidation Catalyst (DOC). Therefore to reduce HC, CO and PM engine demands catalyst with high oxidation activity at low temperatures. Consequently with ultra thin walls and PGM coatings significant improvements in DOC efficiency is achieved at low cost, by increased geometric surface area, reduced thermal mass and Precious Group Metals (PGM) formulation. In this present study, a computational analysis is carried out to design and optimize the DOC PGM loadings and experimentally design is validated by meeting the emission norms. The engine employed for this experimental activity is a 3 cylinder, CR diesel engine.
更严格的排放标准正迫使汽车制造商将催化转化器与发动机废气结合在一起。在排气歧管处或附近安装催化转化器(DOC)有助于减少冷发动机启动后排放的增加。这是因为冷发动机需要更丰富的空气-燃料混合物才能平稳运行。只有适当设计催化转化器和薄壁衬底,以加快催化剂的发光速度,才能达到排放标准。此外,轻型商用柴油车的低废气温度对柴油氧化催化剂(DOC)的成功运行提出了非常具有挑战性的环境。因此,为了降低HC、CO和PM,发动机需要具有高低温氧化活性的催化剂。因此,通过增加几何表面积、减少热质量和贵重金属(PGM)配方,超薄壁和PGM涂层以低成本显著提高了DOC效率。在本研究中,通过计算分析来设计和优化DOC PGM负载,并通过满足排放规范来验证实验设计。本实验活动使用的发动机是一台3缸CR柴油机。
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引用次数: 3
Computer aided design and analysis of piston mechanism of four stroke S.I. engine 四冲程内燃机活塞机构的计算机辅助设计与分析
Pub Date : 2010-11-01 DOI: 10.1109/FAME.2010.5714807
B. Rajendra, G. V. Patil
This paper illustrates design procedure, kinematics and dynamic analysis of piston of single cylinder of air-cooling S.I. engine at maximum power and maximum torque condition. It is the study of the geometry of motion. Kinematics analysis involves determination of position, displacement, rotation speed, velocity and acceleration and inertia force and dynamic analysis involves determination of tangential force, radial force, forces on bearing, and torque on the crankshaft. In this paper the complete kinematic and combined static and dynamic force analysis of a single cylinder, four stroke internal combustion engines are discussed. The Complex Algebra analytical approach is used for analysis is less time consuming if it is programmed for the computer solution. The pressure for one cycle at maximum power condition data for the analysis of the engine has been calculated by using Engine Pro V 3.9 engine cycle simulation program software. The computer program is prepared in visual basic language software for Kinematic and dynamic analysis of the engine at the every crank interval.
本文阐述了风冷内燃机单缸活塞在最大功率、最大扭矩工况下的设计过程、运动学和动力学分析。它是对运动几何的研究。运动学分析包括确定位置、位移、转速、速度、加速度和惯性力,动力学分析包括确定切向力、径向力、轴承上的力和曲轴上的扭矩。本文对单缸四冲程内燃机进行了完整的运动学和动静力综合分析。复代数分析方法用于分析,如果将其编程为计算机解决,则耗时更少。利用engine Pro v3.9发动机循环仿真软件,计算了发动机最大功率工况下一个循环的压力数据,用于发动机的分析。用visual basic语言编写了发动机各曲柄间隙的运动学和动力学分析程序。
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引用次数: 4
Reduction of automotive brake squeal through pad geometrical modifications: A numerical study 通过垫片几何修正降低汽车制动尖叫:数值研究
Pub Date : 2010-11-01 DOI: 10.1109/FAME.2010.5714864
C. Sujatha, M. Nouby, K. Srinivasan
Reducing brake squeal noise for the improvement of ride comfort is one of the most important issues in today's automotive industry. This study details an investigation into the design modification of a brake pad for the front disc brake system as found on a typical passenger vehicle, and reports how the design modification can be improved to reduce the occurrence of squeal. As an extension to earlier finite element (FE) brake models described in literature, a detailed FE model of the whole disc brake corner is developed and validated using experimental modal analysis. Stability analysis of the disc brake corner using the FE software ABAQUS is carried out to predict squeal occurrence. To reduce squeal noise, stability analysis was conducted for several geometrical modifications on the pad. The results show that squeal could be reduced if the back plate and friction material thickness are increased.
降低制动尖叫噪声以提高乘坐舒适性是当今汽车工业中最重要的问题之一。本研究详细调查了一辆典型乘用车前盘式制动系统的刹车片的设计修改,并报告了如何改进设计修改以减少尖叫的发生。作为文献中描述的早期有限元制动模型的扩展,建立了整个盘式制动器角的详细有限元模型,并使用实验模态分析进行了验证。利用有限元分析软件ABAQUS对盘式制动器弯角进行了稳定性分析,预测了尖叫的发生。为了降低尖叫噪声,对发射台进行了几种几何修改,并进行了稳定性分析。结果表明,增大后板厚度和摩擦材料厚度可以有效地降低摩擦摩擦产生的噪声。
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引用次数: 4
Simulation of axial cooling loop for high speed spindles with rectangular crossection using CFD 矩形截面高速主轴轴向冷却回路的CFD模拟
Pub Date : 2010-11-01 DOI: 10.1109/FAME.2010.5714832
B. B. Mansingh, A. Pravin
The purpose of this paper is to numerically analyze the three-dimensional fluid motion and temperature distribution in built-in motorized high-speed spindle housing having axial water cooling channel with rectangular crossection. A three dimensional finite element model of high speed spindle housing is developed and simulated using computational fluid dynamics software to determine the temperature distribution considering the impedance of the motor coils. The effects of different heat sources and varied number of loops are examined in detail. The model is based upon a custom-built high performance spindle, which is used in the printed-circuit board industry, with a maximum speed of 160,000 rpm. The results indicate that the designed cooling loop is more effective and increase in temperature can be reduced significantly
本文对具有矩形截面轴向水冷却通道的内嵌式高速电主轴机壳内的三维流体运动和温度分布进行了数值分析。建立了高速主轴壳的三维有限元模型,并利用计算流体动力学软件对其进行了仿真,以确定考虑电机线圈阻抗的温度分布。详细分析了不同热源和不同回路数的影响。该模型基于定制的高性能主轴,用于印刷电路板行业,最高转速为160,000 rpm。结果表明,所设计的冷却回路更有效,可以显著降低温度的升高
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引用次数: 3
Laminar convection through porous medium between two vertical parallel plates with heat source 带热源的垂直平行板间通过多孔介质的层流对流
Pub Date : 2010-11-01 DOI: 10.1109/FAME.2010.5714846
M. Vidhya, S. Kesavan
An exact solution to fully developed flow of a viscous, incompressible fluid in a porous medium between two vertical parallel plates with heat source is presented here. The velocity and temperature profiles are shown graphically and the numerical values of the skin friction and the rate of heat transfer are entered in a table. It is observed that an increase in the permeability parameter σ (or) the Rayleigh number Ra leads to an increase in the velocity and the temperature profiles where there is a decrease in the values of skin friction or the rate of heat transfer.
一个精确的解决方案,充分发展流动的粘性,不可压缩流体在多孔介质之间的两个垂直平行板与热源。速度和温度曲线用图形表示,表面摩擦和传热率的数值用表格表示。观察到,渗透率参数σ(或瑞利数Ra)的增加导致速度和温度曲线的增加,而表面摩擦值或换热率则降低。
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引用次数: 18
Experimental investigation of compression ratio and boost pressure influence on RG blended CNG — HCCI combustion engine 压缩比和增压压力对RG混合CNG - HCCI内燃机影响的实验研究
Pub Date : 2010-11-01 DOI: 10.1109/FAME.2010.5714813
P. Diaz, B. Durgaprasad
This paper investigates the compression ratio and boost pressure influence on performance of RG blended CNG — HCCI combustion over a range of load and effect on exhaust emission. HCCI engines operates on the principle of having a dilute, premixed charge that reacts and burns volumetrically throughout the cylinder as it is compressed by the piston. In some regards, HCCI incorporates the best features of both spark ignition (SI) and compression ignition (CI) engine, the charge is well mixed, which minimizes particulate emissions, and as in a CIDI engine, the charge is compression ignited and has no throttling losses, which leads to high efficiency. However, unlike either of these conventional engines, the combustion occurs simultaneously throughout the volume rather than in a flame front. This important attribute of HCCI allows combustion to occur at much lower temperatures, dramatically reducing engine-out emissions of NOx. But, the pure CNG fueled HCCI engine successfully operates only in a narrow range of conditions bounded by severe knock on the fuel-rich side and lean misfire on the lean side and high NOx emission. It was found that RG blending with base CNG fuel in HCCI engine produces wider operating range towards lean burn boundary. Replacing CNG with RG increases measured combustion efficiency, particularly for leaner mixture. Boost pressure increases air/fuel ratio and thus increases the thermal mass to be heated by the combustion heat release resulting in expanding operating region towards high load range and reduction in exhaust emission.
本文研究了压缩比和增压压力对RG - HCCI混合燃烧性能在一定负荷范围内的影响以及对废气排放的影响。HCCI发动机的工作原理是,当被活塞压缩时,稀释的预混装药在整个气缸中发生反应并按体积燃烧。在某些方面,HCCI结合了火花点火(SI)和压缩点火(CI)发动机的最佳特性,装药混合良好,最大限度地减少了颗粒排放,并且与CIDI发动机一样,装药是压缩点燃的,没有节流损失,从而提高了效率。然而,与这两种传统发动机不同的是,燃烧在整个体积内同时发生,而不是在火焰前。HCCI的这一重要特性使燃烧可以在更低的温度下进行,从而大大减少了发动机排出的氮氧化物。但是,纯CNG燃料的HCCI发动机仅在燃料丰富的一侧严重爆燃,稀薄一侧轻微失火以及高NOx排放的狭窄条件范围内成功运行。研究发现,在HCCI发动机中,RG与基础CNG燃料混合后,其向稀薄燃烧边界的工作范围更大。用RG代替CNG可以提高燃烧效率,特别是对于更稀薄的混合物。增压压力增加了空气/燃料比,从而增加了燃烧热释放加热的热质量,从而扩大了工作区域,达到高负荷范围,减少了废气排放。
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引用次数: 2
Buckling and vibration analysis of FGM plates and shells FGM板壳屈曲与振动分析
Pub Date : 2010-11-01 DOI: 10.1109/FAME.2010.5714816
Jasmeet Singh, R. K. Thangaratnam
This paper presents the nonlinear formulation for Functionally Graded Material (FGM) plates and shells using Semiloof Shell element. Results for buckling and vibration analysis of functionally graded plates and shells are reported.
本文采用半壳单元提出了功能梯度材料(FGM)板壳的非线性公式。报道了功能梯度板壳的屈曲和振动分析结果。
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引用次数: 4
期刊
Frontiers in Automobile and Mechanical Engineering -2010
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