双电机耦合驱动电动汽车驱动模式划分与优化

为充分发挥一款双电机耦合驱动系统电动汽车(DMCP-EV)多驱动模式的节能优势,制定了基于系统效率最优的驱动模式控制策略。根据该双电机耦合驱动系统的结构特点,定义了电机4种驱动模式并分别建立其动力学驱动模型和系统效率模型。在满足动力性要求的前提下,分析并划分了各驱动模式的工作范围,以系统效率为优化目标,采用粒子群优化算法进行优化,获得最佳的驱动模式切换控制和转矩分配策略。开展了Matlab/Simulink仿真和硬件在环试验验证。结果表明,经系统效率优化的驱动模式在满足动力性要求的前提下,有效提高了双电机耦合驱动系统的经济性,能耗降低11%。     

Comparing rail fuel efficiency with truck and waterway

This paper presents a railroad energy efficiency model used to estimate the fuel economies for classes of trains transporting various commodities. Comparable procedures are used to estimate truck and waterway fuel consumption. The results show that coal unit trains are 4.5–5.0 times more energy efficient than movements in the largest trucks allowed in the eastern and western regions of the US, unit grain train movements in the central US are 4.6 times more fuel efficient, soda ash unit train and non-unit train shipments are 4.9 and 3.2 times more efficient, and ethanol unit train and non-unit train movements are 4.8 and 3.0 times more efficient. In terms of barge traffic, coal unit train and non-unit train are 1.3 and 0.9 times as energy efficient in the eastern US, grain unit train and non-unit train movements are 1.7 and 1.0 times more efficient from Minneapolis to the Gulf of Mexico, and grain unit train and non-unit train movements are 1.0 and 0.7 times more fuel efficient from the Upper Ohio River to the Gulf of Mexico.     

电子干扰效果与效能评估的研究

在研究现有电子干扰效果与评估的基础上，提出与现代电子战相适应的新型干扰效果和评估技术，定义新型的电子干扰效果评估因子和效能评估因子的概念与表示方法。     

关于加快B＆W662VT2BF-140型主机装置修复工艺程序的探讨

文章主要对B＆W662VT2BF-140型主机装置船上找正交验时，通过采用传统的工艺程序与改进后的工艺程序的比较，说明两种工艺程序的共同点与不同点，以及对修船周期的影响。     

Egg production and associated losses of carbon, nitrogen and fatty acids from maternal biomass in Calanus finmarchicus before the spring bloom

We present concurrent data on ingestion, egg production and the loss of maternal biomass in pre-spring bloom female Calanus finmarchicus incubated under conditions representative of those in situ in the North Atlantic. A balanced metabolic budget was constructed and used to examine the relative importance of ingestion and biomass for fuelling egg production during the incubations. Ingested carbon was not sufficient to meet the observed demands for egg production. More than 80% of the carbon utilised by the females was instead derived from their biomass. Fatty acid analysis demonstrated that the storage reserves, 20:1 (n−9) and 22:1 (n−11), were virtually absent before experimentation began, and therefore could not have been used to supply the carbon required for egg production during the incubations. The C:N mass-specific ratio of the biomass utilised was 4.1, suggesting that the females had instead catabolised protein in order to meet their metabolic demands. These results suggest that C. finmarchicus adopts a sacrificial reproductive strategy when food availability is low.     

高效燃烧汽油机技术特点分析与研究

参照近代内燃机技术手段可知,采用阿特金森循环等传统降油耗技术手段往往伴随着发动机动力性能的妥协,因此寻找一种兼顾动力性与经济性的提升热效技术手段变得迫在眉睫。阐述了马自达SKYACTIV-X、现代起亚Smartstream 1.5 L Turbo GDI等高热效汽油机技术路线的原理、结构形式、技术特点,为日后研发工作指明了方向。     

商用车试制PT至SOP快速验证方法研究

目前商用车的开发主要分为骡子车试制、工程试制和试生产几个阶段,与乘用车不同,商用车存在车型配置繁多,而且不同的配置之间可能会对整车在底盘的布置产生影响,进而影响整车在量产线的通过性,因此有必要在PT(工程试制)和SOP(试生产)阶段间加一个验证阶段,文章首先介绍了PT转SOP试制线的布局及工艺编排,然后对PT转SOP快速试制验证流程进行了介绍,最后对PT转SOP量产通过性的判断指标进行了说明,对PT车型如何更好的过渡到量产,减少量产线的停线及线下返工具有一定的参考意义。     

基于造船总装生产线的船厂生产计划与控制分析

根据集成制造的原理，论述了基于造船总装生产线的船厂生产计划、作业控制方式；提出了PERT、MRPⅡ、JIT三者集成的思路和方式；首次阐明了“集成中间产品”、“中间产品组”、“中间产品包”的含义和它们之间的关系，及其在造船总装生产线生产组织中的作用。     

应急柴油机水泵机组冷却系统浅析

阐述应急柴油机水泵机组用柴油机冷却系统的设计匹配技术要求及其对柴油机整机性能的影响，提出了冷却系统的性能评价指标。     

公路施工项目的安全生产管理

随着公路工程建设项目的全面推进，安全环保施工暴露出了较多问题，为全面加强安全生产管理，消除安全生产隐患，制定公路施工项目安全生产管理的有效策略势在必行。