检索结果-南通市图书馆

Modeling and Experimental Study of PEM Fuel Cell Transient Response for automotive applications

Tsinghua Science and Technology 2009年第5期14卷 639-645页

作者：华剑锋徐梁飞林辛凡卢兰光欧阳明高 State Key Lab of automotive Safety and Energy Department of Automotive EngineeringTsinghua University

This paper presents an analysis of the dynamic response of a low pressure proton exchange membrane （PEM） fuel cell stack to step changes in load, which are charactedstic of automotive fuel cell system applications. The goal is a better understanding of the electrical and electrochemical processes when accounting for the characteristic cell voltage response during transients. The analysis and expedment are based on a low pressure 5 kW proton exchange membrane fuel cell （PEMFC） stack, which is similar to those used in several of Tsinghua＇s fuel cell buses. The experimental results provide an effective improvement reference for the power train control scheme of the fuel cell buses in Olympic demonstration in Beijing 2008.

关键词： proton exchange membrane (PEM) fuel cell transient response automotive applications fuel cell modeling

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A review of magnesium die-castings for closure applications

引用

Journal of Magnesium and Alloys 2019年第2期7卷 297-304页

作者： J.P.Weiler Meridian Lightweight Technologies Canada

Vehicle mass reduction in the automotive industry has become an industry-wide *** fuel efficiency and greenhouse gas emission targets for engine-powered vehicles,and ambitions for extended range electric vehicles have motivated these reductions in vehicle *** reduction opportunities in structural automotive applications are increasingly realized through lightweight alloy castings,such as magnesium,primarily due to the ease of component *** traditional benefits of magnesium die-castings including lightweighting and associated compounded mass savings,excellent strength-to-weight ratio,part consolidation,near net-shape forming,dimensional repeatability,and integration of additional components can be realized in closure *** recent example is the application of a magnesium die-casting for the structural inner of the liftgate in the 2017 Chrysler Pacifica,replacing nine parts in the previous generation and resulting in a liftgate assembly weight reduction of nearly 50%.The work presented here reviews past and current developments of magnesium die-castings in closure applications and discusses the benefits and challenges of magnesium alloys for these applications,including casting design,corrosion and fastening strategies,and the manufacturing design and assembly methodologies.

关键词： Die-casting automotive applications Closures Lightweighting

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Evaluation of hot pressing parameters on the electrochemical performance of MEAs based on Aquivion^(■) PFSA membranes

引用

Journal of Energy Chemistry 2019年第8期28卷 168-173,I0006页

作者： Irene Gatto Ada Sacca Vincenzo Baglio Antonino Salvatore Arico Claudio Oldani Luca Merlo Alessandra Carbone CNR-ITAE Institute for Advanced Energy Technologies"N. Giordano" Via S. Lucia Sopra Contesse 5Messina Italy Solvay Specialty Polymers Viale Lombardia 20 20021 Bollate MI Italy

The membrane-electrodes assembly(MEA) is the core of the Polymer Electrolyte Fuel Cell(PEFC). It consists of a membrane, catalytic(CL) and gas diffusion layers(GDL). In order to manufacture MEAs with suitable performance, a hot-pressing procedure is generally used. The relevant parameters are the temperature, pressure and time of hot-pressing. Such variables need to be adjusted as a function of the type of ionomer used in the catalytic layer and membrane. In this study, an evaluation of the temperature of hot-pressing was carried out and its influence on MEA electrochemical performance was assessed. In particular, preparation trials of MEAs were carried out with reinforced experimental membranes based on Aquivion^■ short-side-chain PFSA(by Solvay Specialty Polymers). The membranes were coupled to gas diffusion electrodes, and MEAs were manufactured using different temperatures for the hot-pressing procedure in order to evaluate their influence on the electrochemical performance of PEFCs, in the temperature range of 80–95 °C, with low relative humidity of the reactant gases. The electrochemical performance of the prepared MEAs was tested in a H2/Air 25 cm^2 single cell in terms of polarization curves and accelerated stress test(AST).

关键词： Aquivion^(■) Short-side chain PEFC Hot-pressing parameters automotive applications

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Feasibility of 0.02% Nb-Based Microalloyed Steel for the Application of One-Step Quenching and Partitioning Heat Treatment

引用

Materials Sciences and applications 2021年第8期12卷 374-387页

作者： Basem Tarek Eman EL-Shenawy Ahmed El-Sabbagh Mohamed A. Taha Design and Production Engineering Department Faculty of Engineering Ain Shams University Cairo Egypt Plastic Deformation Department Central Metallurgical R&D Institute (CMRDI) Cairo Egypt

To attain an enhanced combination of mechanical properties for low alloyed steel, the current study has been made to fulfill that growing need in the industry. Its results are introduced within this paper. One step Quenching and Partitioning (Q&P) heat treatment has been applied on Niobium-based microalloyed steel alloy with 0.2 %C, in the form of 2 mm thickness sheets. The target of this study is to investigate the viability of applying that significantly recommended, results-wise, heat treatment on the highly well-suited alloy steel samples, to achieve the main target of enhanced properties. A single temperature of 275°C was used as quenching and Partitioning temperature. Four Partitioning periods (30, 200, 500, and 1000 Seconds) were used for soaking at the same temperature. The results were analyzed in the light of microstructural investigation and mechanical testing. All applied cycles did not enhance the strength but moderately improved the ductility and toughness, mainly caused by the slightly high soaking temperature used. Niobium impact of grain refining was apparent through all cycles. The cycle of 500 Seconds Partitioning time obtained optimum values at that particular temperature. The 1000 Seconds Cycle obtained the worst combination of properties. A set of recommendations are set. More research is required at this point, where a lower Partitioning temperature is advised. In the light of the applied combination of parameters, the Partitioning period at such temperature is advised to be between 500 and 1000 Seconds. A high probability that periods closer to 500 than 1000 Seconds will produce better results. More research is needed between those two values of Partitioning time to precisely determine the optimum time at that temperature on that specific alloy.

关键词： Nb-Based Microalloyed Steel Advanced High Strength Steel Quenching and Partitioning Retained Austenite Martensite Transformation automotive applications

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rapid Prototyping and Validation of Mars 0913 Brushless Motor to Develop Mild HEV

Rapid Prototyping and Validation of Mars 0913 Brushless Moto...

引用

2015中国汽车工程学会年会

作者： Mohamed Awadallah Peter Tawadros Nong Zhang University of Technology Sydney

We discuss a mild hybrid powertrain based on a solution placing a small electric motor behind the first reduction *** electric motor may be used for power supplementation,and is controlled in both power and *** the primary use of the motor is for torque-hole fill-in in an AMT-equipped *** motor is controlled to reduce clutch slip,and provide torque fill-in during gear *** paper will describe the real-time control and the validation of Mars 0913 BLDC *** validation process involves specific implementation techniques for model processing and interfaces in real-time with electrical hardware *** tools and interfaces necessary to that validation are also presented,and include KHB 12601 BLDC Kelly Controller,dSPACE MicroAutoBox II,for hybrid vehicle *** will include a design processes for handling real-time control using Simulink,DSPACE RTI＆Control Desk environment and finally,the validation based on Dynamometer testing to get all performance data of BLDC motor and mechanical parts as designed by *** paper is based on the technique of Rapid Controller Prototyping（RCP）.It is an efficient method for solving motor control problems such as *** this design,we connect the universal controller（MicroAutoBox）to the KHB *** interface signals are configured and then the two controllers are connected by Relays and CAN line according to the specifications of the real system.

关键词： automotive applications brushless motors control design hybrid systems motor drives permanent magnet motors

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：