铁道车辆通过辙叉时的垂向动力模拟计算

在车辆－轨道垂向系统统一模型的基础上，提出铁道车辆－辙叉相互模型。对道岔结构作一定的简化处理，针对道岔垂向几何不平顺，运用轮轨系统耦合动力学理论，模拟计算得到车辆通过道岔辙叉时的轮轨冲击力以及车体、辙叉、岔枕和道床等振动响应。模拟结果显示：辙叉叉心处的不平顺空间，是直接影响轮轨冲击力的部位，它可以引起较大的轮轨冲击力，并引起车辆与轨下基础结构振动。     

一种微型车用半轴全浮支承式动力储备驱动后桥

国产微型汽车只带有3个前进挡和1个倒挡的变速器,因此在差速器驱动桥上增设了一个具有2个前进挡和1个直接挡的“动力储备变速箱”,使微车拥有6个前进挡,实现了微车驱动轮的输出转矩和速度的变化范围扩大,提高了整车的动力性和经济性.     

空车调整最小费用的合理分摊

借助多人合作对策的思想建立了铁路空车调整问题中最小费用合理分摊的数学模型，给出了建立理想分摊向量和特征函数的一种方法，并提供了具体解法，比较有效地解决了空车调整中最小费用的合理分摊问题，为最优调运方案的实际实施提供了前提和保障。     

大鼠下丘脑酪氨酸羟化酶免疫反应产物的衰老变化

本文运用光镜和电镜免疫组化技术,观察了幼年(3月龄)和老年(24月龄)大鼠下丘脑酪氨酸羟化酶(TH)免疫反应产物的衰老变化。与幼年相比,老年TH阳性细胞,尤其是位于下丘脑后部和背内侧核/未定带的阳性细胞,其染色强度明显降低。在数量方面,除视前区外,老年下丘脑的弓状核、室周核、背内侧核/未定带以及下丘脑后部的TH阳性神经细胞呈显著性减少。另外,老年正中隆起的TH阳性神经纤维明显比幼年者减少。电镜下,TH标记的轴突终未呈现退行性改变的迹象。上述衰老变化可能是导致老年下丘脑和垂体内分泌功能紊乱的重要原因。     

电磁斥力机构触动时间研究

本文在Ansys Workbench中,结合Maxwell 2D与Mechanical模块对电磁斥力机构的瞬态运动过程进行了联合仿真,完成了电磁斥力计算,并将电磁斥力作为载荷对电磁斥力机构进行了瞬态动力学分析,得到了电磁斥力机构传动部件在瞬态动作过程中的应力应变,提取了动触头处的位移曲线,得到了电磁斥力机构的触动时间为210μs,计算结果与试验结果 220μs的误差为4.5%,可以满足工程设计需要,为电磁斥力机构触动时间的计算提供了一种方法。     

Galvanic corrosion behaviour of HE 20 / MDN 138 & HE 20 / MDN 250 alloys in natural seawater

In view of their excellent mechanical properties, workability and heat treatment characteristics, MDN 138 & MDN 250 have been widely used in missile, rocket and aerospace industries. With light weight and high performance characteristics HE 20 aluminium alloy acts as an important material in defence and aerospace applications. The galvanic corrosion behaviour of the metal combinations HE 20 / MDN 138 and HE 20 / MDN 250, with 1:1 area ratio, has been studied in natural seawater using the open well facility of CECRI’s Offshore Platform at Tuticorin for a year. The open circuit potentials of MDN 138, MDN 250 and HE 20 of the individual metal, the mixed potential and galvanic current of the couples HE 20 / MDN 138 and HE 20 / MDN 250 were periodically monitored throughout the study period. The calcareous deposits on MDN 138 and MDN 250 were analysed using XRD. The results of the study reveal that that HE 20 has offered required amount of protection to MDN 138 & MDN 250.     

Evaluating the impact of PSC inspectors’ professional profile: a case study of the Spanish Maritime Administration

Full-scale globalisation of trade has been accompanied by a progressive liberalisation of maritime transport. The proliferation of open registries has created a situation in which Port State Control (PSC) has become much more effective than the feeble or non-existent control exercised by those States. This study has been conducted on the influence of the professional profile of inspectors on inspection results. The objective of our paper was to evaluate the impact of PSC inspectors’ professional profile by conducting a case study of the Spanish Maritime Administration. The paper concludes with a discussion of the correlation between deficiencies detected and professional profiles.     

The influence of parents’ travel patterns,perceptions and residential self-selectivity to their children travel mode shares

Using the UK National Travel Survey from 2002 to 2006, this paper investigates the influence of households’ residential self-selectivity, parents’ perceptions on accessibilities and their travel patterns on their children daily travel mode share. In doing this, this study introduces a model structure that represents the complex interactions between the parents’ travel patterns, their perceptions on public transport services and their reported residential self-selectivity reasons and the children travel mode shares. This structure is analysed with structural equation modelling. The model estimation results show that parents’ residential self-selectivity, parents’ perceptions and satisfactions on accessibilities and their daily travel patterns significantly influence the children’s daily travel mode shares. However, the effects are not uniform across household members. This study has revealed that households’ residential self-selectivity behaviours have more correlations with the children’s non-motorised mode shares, whilst the parents’ perceptions and satisfactions on transport infrastructure and public transport service qualities have more correlations with parents’ mode shares. The results also confirm that parents’ non-motorised modes use in travelling is highly correlated with the children’s physically active travel mode shares. However, at the same time, the results also show that the effects of mothers’ car use to the children travel mode shares is more apparent than fathers’.