镶铸气缸套外表面结构对形状结合度的影响

镶铸气缸套为铝气缸体曲轴箱的一种创新气缸套工作表面技术,其基本的前提条件是铸铁气缸套与铝气缸体曲轴箱之间必须形成较高的形状结合度,从而使气缸套牢固地结合在发动机机体中,同时,使燃烧热量向冷却水套方向散发。目前的模拟计算仅能依靠浇铸过程期间的熔融温度提供的气缸套结合牢度从而进行参考,而德国Foseco和Volkswagen公司的最新研究考虑到了气缸套外表面的结构。介绍了建立模拟模型的方法以及模拟计算结果与实际铸件的比较。     

采用闭环调节回路的柴油机喷射系统

博世公司针对柴油机开发了一种新型喷油系统。这种被命名为"针阀闭环控制"的喷油系统基于电磁阀式喷油器的共轨喷油技术而开发。其能以闭环方式调节喷油持续期,同时借助于喷油器中的压电传感器和新型软件结构以极高的精度进行采集并调节每次燃油喷射的持续期。从而能在实际行驶条件下,在整个汽车使用周期内确保对发动机较为重要的燃油计量和准备精度,因此这种喷油系统有效提升了轿车柴油机动力装置未来技术竞争力。     

Texture Development of a Cold-rolled CuZnAl Alloy

lIntroductionTheCu26Zn-5Al-0.7Ti(wt%)allOysareshaPeIneInOryalloys.PolytwstallineshaPempalloysareingeneralusedinengineeringaPPlicatons.TheshapempeffectsarecloselyrelatedwiththetextUresforthesing1ecrystalshavetheshmplyanisotrOPicPfOPetw[l-3].ItwasshownthatextUredshaPempal1oyspossessedthebettershaPememOryeffectsthannontextUrdones[4].Cu-basedallOystendeasilytOgrowintolnyegrainsinhotrolling,andarenosultabletocoldrollingbecausethe0PhasehasalowmalleabilityatroomtemperatUre.FortheCuZnAlal…     

降低机车轮缘磨耗的途径

本文对近来出现的轮缘与钢轨头部内侧严重磨耗进行了分析,找出了原因,提出了一种通过对连接轴箱和转向架构架的拉杆部件进行改造来达到减轻这种磨耗的方法。     

俄罗斯自动车钩缓冲器结构

在对既有缓冲器结构进行分级评估的基础上,研制出了铁道车辆用ПМКП-110型新的冲击式缓冲器和ЭПА-120型大容量弹性胶泥缓冲器.     

铁路用液压和气动设备的创新密封技术

在铁路行业中,如若不提高安装在气动和液压仪器设备中的密封件的可靠性和使用寿命,则想要改进它们的工作特性和降低生命周期成本的任务是不可能完成的.尽管密封件的成本不高,但是它们对最终产品可靠性的贡献是十分巨大的.通常,密封状态是确定运行装置无修理走行里程的决定性判据.正因为如此,采用先进的密封材料和密封部件的结构,以及在密...     

基于ARCGIS技术在工程水文分析计算中的应用——以克孜河卡拉贝利水库水文分析计算为例

ARCGIS具有强大的空间数据和属性数据的处理能力,将ARCGIS技术运工程水文分析计算中,不但可以减少大量繁琐的计算工作,而且可以大大提高计算速度和准确度。以克孜河卡拉贝利水库水文分析计算为例,探讨了ARCGIS技术在工程水文领域中的应用。     

采用铝热喷涂反刺薄壁铸铁缸套的全新1.4 L发动机开发

为了实现发动机气缸体的紧凑性与轻量化,开发了外侧带反刺的全新铸铁缸套。同时对外壁喷涂铝,以增强导热性,并提高缸套与气缸体之间的结合力。无须重新设计气缸体和曲轴,仅通过采用新的缸套,发动机的排量可由1.25 L增大到1.4 L。新缸套增加了排量,但在外形尺寸和生产设施方面均无重大变更。     

多弹性支撑设备的同步定相振动控制研究（英文）

This paper describes an analytical investigation into synchrophasing, a vibration control strategy on a machinery installation in which two rotational machines are attached to a beam-like raft by discrete resilient isolators. Forces and moments introduced by sources are considered, which effectively represent a practical engineering system. Adjusting the relative phase angle between the machines has been theoretically demonstrated to greatly reduce the cost function, which is defined as the sum of velocity squares of attaching points on the raft at each frequency of interest. The effect of the position of the machine is also investigated. Results show that altering the position of the secondary source may cause a slight change to the mode shape of the composite system and therefore change the optimum phase between the two machines. Although the analysis is based on a one-dimensional Euler–Bernoulli beam and each machine is considered as a rigid-body, a key principle can be derived from the results. However, the factors that can influence the synchrophasing control performance would become coupled and highly complicated. This condition has to be considered in practice.