供油凸轮机构CAD系统的研究

供油凸轮机构ＣＡＤ系统的研究陈国金＊⒇（杭州电子工业学院）李京鲁（杭州汽车发动机厂）引言供油凸轮是柴油机供油系统中的关键零件之一。其设计质量的优劣对喷油泵的供油速率、最高转速、工作可靠性以及喷射性能有着直接的影响。而其设计过程诸如型线和升程函数计算、...     

柴油机喷油泵供油量不均的调整

分析了引起喷油泵供油不均的原因,如调试状态与使用条件的不同、调试时存在的供油不均、机件磨损、出油阀弹簧失效等;阐述了喷油泵装机后供油提前角、供油正时的检查及调整方法     

柴油机供油正时调整

着重介绍了柴油机供油正时的调整方法，简要介绍了柴油机供油正时的正确与否的判断方法，并叙述了如何检查供油提前角。     

单体喷油泵在190柴油机上的应用与研究

本文对单体喷油泵使用中存在的各缸供油正时调整、供油量均匀度检测等问题进行了研究,并提出了解决方法。     

摩托车发动机润滑系统设计

本文介绍了摩托车发动机润滑系统的设计思路和设计方法 ,重点介绍了循环供油量和供油压力的估计方法以及机油泵的设计计算步骤。     

柴油机供油压力波管外测量研究

针对大功率柴油机供油装置的特点和现有供油压力夹紧式传感器信噪比小、对油管形状适应性差、寿命短的弱点展开研究，设计了一种新供油压力夹紧式传感器，在大功率柴油机上取得了良好的效果。     

供油装置配置浅析

本文阐述了有关汽轮机辅助系统中的供油装置配置的功能分析及设计分析，从两个方面介绍了供油装置的配置。分别从供油装置基本功能与设计分析，给水泵汽轮机供油装置功能与设计分析和常规供油装置功能及设计分析来介绍供油装置系统体系。     

高压共轨系统高压油泵供油特性影响因素分析

在AMESim仿真环境下完成了高压油泵溢流阀、VCV阀、进油阀、出油阀及供油柱塞等组件模型的建立,通过与高压油泵试验台上的试验数据对比,验证了仿真模型的准确性。利用仿真模型研究了全工况平面内溢流阀、VCV阀、进油阀、出油阀和阻尼孔等部件参数对高压油泵供油特性的影响规律。研究结果表明:在零负荷下,循环供油量随凸轮轴转速的升高而减小,此时进油阀预紧力与节流孔直径对循环供油量影响明显;在部分负荷下,循环供油量随凸轮轴转速的升高而减小,此时溢流阀弹簧刚度、VCV阀弹簧刚度和预紧力、进油阀弹簧预紧力和阻尼孔直径对循环供油量影响明显;在全负荷工况下,循环供油量在低转速时随凸轮轴转速的升高而升高,在高转速时随凸轮轴转速的升高无明显变化。     

柴油机供油量检测初探

柴油机供油量检测初探空军第二训练团刘同洲１前言柴油机工作时，供油量的大小无法监视，柱塞的磨损程度便无法知道，对于供油量减小而造成柴油机功率下降的原因，原机操作人员只能凭感觉而知，检修人员没有一套科学的手段对喷油泵供油量是否下降进行科学的测定。要想了解...     

柴油汽车供油正时的检查与调试

介绍柴油汽车供油正时的检查方法，总结了现代柴油汽车供油正时的调试方法与各自的特点，以及供油正时检查与调试的注意事项。     

阻尼出油阀柴油机喷油系统液力过程的计算与分析

论述了由阻尼油阀组成的柴油机喷油系统的液力过程的计算与分析,着重讨论了阻尼出油阀结构对油特性的影响。     

A comparative techno-economic and quantitative risk analysis of hydrogen delivery infrastructure options

The comparative techno-economic analysis and quantitative risk analysis (QRA) of the hydrogen delivery infrastructure covering the national hydrogen demands are presented to obtain a comprehensive understanding of the infrastructure of commercial hydrogen delivery. The cost calculation model, which was based on the hydrogen delivery scenario analysis model (HDSAM), was employed to estimate the costs of hydrogen fuel delivery in Seoul, Korea, whose area is small enough to not require intermediate delivery stations. The QRA methodology was modified to be suitable for the comparative analysis of the whole hydrogen infrastructure. The capacities of a hydrogen refueling station and the hydrogen market penetration were employed as the main variables and the two scenarios, viz. the gaseous and liquid hydrogen delivery options, were considered. The analysis results indicate that the delivery system of gaseous hydrogen was superior in terms of cost and that of liquid hydrogen was superior in terms of safety. Both delivery options were affected by the capacity of the station and the market penetration, and the cost and risk drastically changed, especially when the two variables were small. Thus, according to the results, the economic and safety issues of the hydrogen delivery infrastructure are critical to achieving a hydrogen energy society.     

出油阀弹簧刚度及开启压力对柴油机喷油系统中汽泡影响的研究

通过改变喷油泵出油阀弹簧刚度及开启压力 ,借助特制的透明出油阀紧帽腔、CCD摄像机、高速A/ D采集卡、图像采集卡和微型计算机等测试及处理设备 ,对喷油系统中的汽泡现象进行了试验研究 ,揭示出了出油阀弹簧刚度及开启压力对出油阀紧帽腔中汽泡数量和汽泡分布区域的影响规律     

柴油机喷油泵供油量不均匀的就机诊断与排除

引起喷油泵供油不均的原因,主要是调试不当和机件故障;可通过排气温度、单缸断油以及喷油器喷油量来诊断;出现喷油泵供油不均后,就机可采取调整供油齿圈,排放供油系统空气和对柱塞偶件进行检修等办法予以排除。     

The value of cooperatives in rural electrification

The electricity sectors of many developing countries underwent substantial reforms during the 1980s and 1990s, driven by global agendas of privatization and liberalization. However, rural electrification offered little by way of market incentives for profit-seeking private companies and was often neglected. As a consequence, delivery models for rural electrification need to change. This paper will review the experiences of various rural electrification delivery models that have been established in developing countries, including concessionary models, dealership approaches and the strengthening of small and medium-sized energy businesses. It will use examples from the USA, Bangladesh and Nepal, together with a detailed case study of a Nepali rural electric cooperative, to explore the role that local cooperatives can play in extending electricity access. It is shown that although there is no magic bullet solution to deliver rural electrification, if offered appropriate financial and institutional support, socially orientated cooperative businesses can be a willing, efficient and effective means of extending and managing rural electricity services. It is expected that this paper will be of particular value to policy-makers, donors, project planners and implementers currently working in the field of rural electrification.     

Effectiveness through risk reduction: a comparison of the renewable obligation in England and Wales and the feed-in system in Germany

The European Union is particularly rich in variations of different delivery mechanisms for increasing the use of renewable energy. The requirements of liberalisation in continental Europe, the re-regulation of the UK's gas and electricity sectors in 2000 and ongoing environmental commitments has meant the establishment of a new generation of mechanisms following on from early prototypes. This paper analyses two new mechanisms in detail: the England and Wales RO (Renewables Obligation) and the German EEG (Erneuerbare Energien Gesetz), with a particular focus on how they reduce risk for generators. Assuming that risk reduction is an important way to make a support mechanism effective in promoting deployment, the analysis will look at three different kinds of risk, namely, price, volume and balancing risk. It is argued that the German EEG is more effective at increasing the share of renewables than the England and Wales RO because it reduces risk for RES generators more effectively.     

Techno-economic analysis of conventional and advanced high-pressure tube trailer configurations for compressed hydrogen gas transportation and refueling

Transporting compressed gaseous hydrogen in tube trailers to hydrogen refueling stations (HRSs) is an attractive economic option in early fuel cell electric vehicle (FCEV) markets. This study examines conventional (Type I, steel) and advanced (Type IV, composite) high-pressure tube trailer configurations to identify those that offer maximum payload and lowest cost per unit of deliverable payload under United States Department of Transportation (DOT) size and weight constraints. The study also evaluates the impacts of various tube trailer configurations and payloads on the transportation and refueling cost of hydrogen under various transportation distance and HRS capacity scenarios. Composite tube trailers can transport large hydrogen payloads, up to 1100 kg at 7300 psi (500 bar) working pressure, while steel tube trailer configurations are limited by DOT weight regulations and may transport a maximum hydrogen payload of approximately 270 kg. Using steel pressure vessels to transport hydrogen at high pressure is counterproductive because of the rapid increase in vessel weight with wall thickness. The most economic composite tube trailer configuration includes 30-inch-diameter vessels packed in a 3 × 3 array. A linear relationship between the deliverable payload and the capital cost of a composite tube trailer has been developed for configurations with the lowest cost-per-unit payload. The capital cost is approximately $1100 per kg of deliverable hydrogen payload. Considering the entire delivery pathway (including refueling), tube trailer configurations with smaller vessels packed in greater numbers enable higher payload delivery and lower delivery cost in terms of $/kg H₂, when delivering hydrogen over longer distances to large stations. Selection of the appropriate tube trailer configuration and corresponding hydrogen payload can reduce hydrogen delivery cost by up to 16%.     

发动机机油泵供油特性的神经网络建模

结合试验研究结果,通过对影响机油泵供油特性影响因素的分析,建立了用于分析机油泵供油特性的BP神经网络仿真模型,并利用该模型对机油泵的温度特性、转速特性和压力特性进行了预测分析,取得良好的仿真效果。通过对不同样本训练得到的神经网络模型仿真结果和试验结果的比较分析,验证了采用正交法设计该网络模型学习样本的可行性,指出利用正交法设计学习样本时,只要位级选择适当,就可以大大减少学习样本的数量,并取得满意的预测效果。     

喷油泵结构参数对喷油特性和柴油机性能的影响

本文介绍了喷油泵柱塞直径与凸轮升程的匹配对喷油特性和柴油机性能的影响。叙述了为了获得直喷式柴油机的高喷油速率,如何选用合适的喷油泵结构参数。     

对不锈钢复合钢板供货状态的思考

分析了各类不锈钢复合钢板的供货状态对产品制造工艺及设备服役性能的影响，指出不锈钢复合钢板不仅要保持基层材料供货状态的各项性能，同时还应保持复层材料供货状态的各项性能。片面强调某一方面，而忽视另一方面，将给设备的制造和使用造成不利影响。