乘车用燃料电池系统验证体系研究

燃料电池系统作为燃料电池车的关键核心系统,在燃料电池车的开发验证中占据重要地位。从匹配性、功能性、经济性、安全性、环境可靠性和耐久性6个维度,结合乘用车的使用环境和相关国家标准研究来分析燃料电池系统验证体系,构建出乘用车用燃料电池系统验证体系以及相关验证项目。     

广州地铁4号线无线信号小区重选问题研究

介绍了广州地铁4号线关于数字式TETRA标准机制下无线专网小区重选的研究。通过对各参数的分析,探讨影响小区重选的一系列因素,并在广州地铁4号线现场进行了实际应用。通过修改切换参数解决了广州地铁4号线无线信号小区重选不平滑的问题。     

DYNAMIC SIMULATION OF MCFC STACK

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Measuring the sustainability of marine fuels: A fuzzy group multi-criteria decision making approach

The use of alternative energy sources instead of HFO has been recognized as a promising way for reducing emissions from shipping and promoting the development of green shipping. However, it is usually difficult for the decision-making to select the best choice among multiple alternative marine fuels. In order to address this, a complete criteria system for sustainability assessment of alternative marine fuels was firstly established, and a fuzzy group multi-criteria decision making method has been developed to rank the alternative marine fuels by combining fuzzy logarithmic least squares and fuzzy TOPSIS (Technique for Order Performance by Similarity to Ideal Solution). Fuzzy logarithmic least squares method has been employed to determine the weights of the criteria for sustainability assessment, and fuzzy TOPSIS was employed to determine the sustainability order of the alternatives. An illustrative case with three alternative marine fuels including methanol, LNG and hydrogen has been studied by the proposed method, and hydrogen has been recognized as the most sustainable scenario, follows by LNG, and methanol in the descending order. The results show that the proposed method is feasible for prioritizing the alternative marine fuels; it also has the ability to help the decision-makers to select the most sustainable option among multiple marine fuels.     

Social and spatial effects of transforming the private vehicle fleet in Brisbane,Australia

Transformation of the motor vehicle fleet has been an important feature of the world’s peak car phenomenon. Very few urban transport studies have explored such important changes in large urban cities. Using an innovative green vehicle datasets constructed for 2009 and 2014, this paper investigates the ongoing change in urban private vehicle fleet efficiency (VFE) in Brisbane. The spatial patterns of VFE change were examined with social-spatial characteristics of the urban area. The results showed that the social and spatial effect of VFE changes remain uneven over urban space. The inner urban areas have experienced higher level of VFE change, whilst people in the outer and oil vulnerable areas showed a low tendency in shifting to more efficient vehicles. The implication of VFE change for future household vehicle adoption was also evaluated based on a cost-benefit analysis of new vehicle technology costs and expected fuel savings for households that choose a fuel efficient vehicle. The results show that imposing a stronger national fuel economy target in the long term would accelerate evolution of vehicle fleets and oil vulnerability reduction in Brisbane.     

潜艇蓄电池充放电过程释放氢气规律研究

潜艇用铅酸蓄电池充电过程中由于要发生电解水的副反应,因此会释放出大量的氢气.众所周知,氢气是易燃易爆气体,当氢气在空气中含量达到4.65%～70%时,遇火便会发生爆炸.本文介绍了蓄电池产氢原理,铅酸蓄电池充电过程中氢气的采集和检测,通过实验得到了整个充放电过程中氢气释放量的变化规律,并对实验结果进行了分析.     

沪通铁路土压力盒标定工装设计及试验研究

为获取精确的测试数据,提出土压力盒标定需求,通过ANSYS建模分析,设计适用于试验室土压力盒的标定工装:承压板直径取32 cm,标定桶高15 cm,内径33 cm,承压板板厚2 cm,标定桶壁厚0.5 cm。并进行了试验研究,试验表明:采用最小二乘法线性拟合获得的相关系数R~2均大于0.99,线性较好,且同一量程下的2个土压力盒的砂标K_1与厂标K_2的比值相近,数据重复性较好,工装合理适用;砂标K_1大于厂标K_2,工程应用之前,结合工程实际进行标定是必要的;量程选取时,使用范围不宜超过土压力盒最大量程的2/3。     

制氢技术的机动应用研究与改进设计

阐述了电解水制氢技术在机动车上的应用研究与改进设计,详细介绍了系统组成、工作原理、主要性能参数、载车综合控制技术的研究设计和关键技术的解决、电解新技术的研究及新工艺的应用等.机动制氢技术已成功应用于我国"神舟"号系列航天飞行试验和"嫦娥一号"绕月工程的气象保障业务,及时检测"发射、回收窗口"的信息,为航天飞行试验提供可靠的气象参数.     

轻型车用柴油机直喷燃烧系统的研究

本文论述了轻型车用柴油机直燃燃烧系统及工作过程组织的特点，分析了小缸径高速柴油机直喷时遇到的问题，介绍了采用节流轴针式喷油器及双喷油器的小缸径高速柴油机直喷系统的有关研究结果。实验证明，通过工作过程的有效组织。采用这种燃烧系统的柴油机性能可达到与采用传统直喷燃烧系统的柴油机性能基本相当的水平。     

燃料电池混合动力汽车能量控制策略仿真研究

燃料电池客车采用多动力源的动力系统结构，需对其能量流动进行有效的控制。文章探讨了动力系统驱动模式下的3种能量分配控制策略，以及在再生制动模式下的一种简单的能量回馈控制。在ADVISOR软件平台上建立了控制策略和整个系统的仿真模型，并基于性能评估函数对汽车性能进行了分析。仿真结果表明，再生制动可以提高整车燃油经济性达20％，与恒压和离线能量分配相比，在线能量分配下燃油经济性好、蓄电池SOC波动小，但要精确估计蓄电池SOC，可能使其性能比预期的低。