Using a chassis dynamometer to determine the influencing factors for the emissions of Euro VI vehicles

In order to explore the influence of different factors on the emissions of heavy diesel vehicles, a chassis dynamometer was used to test and analyze a Euro VI standard heavy-duty diesel vehicle under different load, fuel, driving conditions, and resistance conditions. The full load condition was found to increase NOx emissions by about 0.107 g/km (30%) and the particulate matter (PM) by 0.003 g/km (18%) compared to the empty load condition. Compared with the China V diesel, the NOx emissions of the Beijing VI diesel were reduced by 0.065 g/km (18%), and PM decreased by 0.004 g/km (25%). The HC, CO, PM, and NOx emissions measured during the Chinese World Harmonized Transient Cycle (C-WHTC) were 0.002 g/km (27%), 0.0005 g/km (14%), 0.0024 g/km (15%), and 0.092 g/km (25%) higher, respectively, than those measured during the European Transient Cycle (ETC). The HC, CO, PM, and NOx emissions measured by using the test resistance were 0.002 g/km (28%), 0.001 g/km (25%), 0.003 g/km (18.7%), and 0.09 g/km (25.7%) higher, respectively, than those calculated with the recommended formula.     

G6300ZC-B型柴油机机体裂缝的原因分析和预防

文章从柴油机机体产生裂缝的机理入手,通过对某柴油机故障调查和原因分析,提出了针对性的整改和预防措施,对做好柴油机管理与故障处理有一定的借鉴意义。     

舰船用新型飞轮储能动发一体机综合物理场分析(英文)

A novel flywheel energy storage(FES) motor/generator(M/G) was proposed for marine systems.The purpose was to improve the power quality of a marine power system(MPS) and strengthen the energy recycle.Two structures including the magnetic or non-magnetic inner-rotor were contrasted in the magnetostatic field by using finite element analysis(FEA).By optimally designing the size parameters,the average speed of FEA results of was 17 200 r/m,and the current was controlled between 62 and 68 A in the transient field.The electrical machine electromagnetism design was further optimized by the FEA in the temperature field,to find the local overheating point under the normal operation condition and provide guidance for the cooling system.Finally,it can be concluded from the comprehensive physical field analysis that the novel redundant structure M/G can improve the efficiency of the M/G and maintain the stability of the MPS.     

滨海核电厂海工建筑物设计标准探讨

作为滨海核电厂的重要组成部分,海工建筑物的设计标准值得研究和探讨。根据核电安全法规及相关规范的要求,对滨海核电厂海工建筑物的结构功能进行分析,将各海工建筑物的安全等级进行系统划分,明确核电厂海工建筑物设计标准需要考虑的内容,并总结海工建筑物设计标准的确定原则。结合国内在建的陆丰核电厂,确定该项目设计参数的标准值,对合理降低核电厂海工建筑物设计标准的思路和方法进行总结,可为类似工程提供参考。     

MTU2000/4000系列推进柴油机的轮机设计特点

MTU2000/4000推进柴油机主要应用于高速船,但不少轮机设计人员对这两型柴油机的特点了解并不充分,因此在轮机设计中也无法充分利用这些特点。该文针对MTU2000/4000推进柴油机机型的特点,结合作者多年的工作经验和体会,开展机型选择、功率的标定和使用、发动机特性曲线和螺旋桨设计点的选择、散热量和安装等方面的总结,对于轮机设计人员有一定的参考价值。     

引进关键技术,降低机车寿命周期成本

关键技术的引进是我国铁路实现跨越式发展的必由之路 ,加快关键技术的引进并尽快实现国产化和产业化 ,有利于实现先进技术的消化、吸收和创新。通过对新型内燃机车寿命周期费用的简要分析 ,阐述了引进关键技术有利于降低机车寿命周期成本。     

CKD8C内燃机车空气-真空制动系统的设计

介绍了CKD8C内燃机车空气—真空制动系统的原理及一些重要部件的选型 ,对于以后采用空气—真空制动系统的国产出口机车的设计及调试具有一定的参考意义。     

船用柴油机修理后常见故障分析

文章分析了船用柴油机修理后发生的常见故障，提出了减少船用柴油机修理后故障、提高修理质量、缩短修理周期的方法。     

利用超大容量电容器改善内燃机车柴油发电机组的电启动性能

指出了单用蓄电池启动柴油发电机组存在的问题，介绍了超大容量电容器辅助内燃机车启动的工作原理，分析了启动辅助装置的经济效益，并通过内燃机车电启动试验证实，用超大容量电容器辅助蓄电池启动柴油发电机组，技术上可行，效益明显。