文章研究了接发列车的到发线分配和咽喉区进路选择问题,在满足到发线使用规则的条件下,以作业计划稳定性强和接发车进路条件优为目标,构建到发线与车站咽喉区运用多目标优化模型。
近年来,我国社会经济不断发展,人们生活水平也日益提高,这种高速化的经济生活为新时期的发展带来了新的问题,人们对物质生活需求也越来越大,要求的质量也越来越高,越来越重视运输的时效性和快速性。随着高速铁路的发展在近几年更是迅猛,中国铁路总公司最新推出的货改方案都为满足现今社会的这种运输需求提供了充分的条件和准备了坚实的基础。
The increasing speed of high-speed railway has improved the requirements for the stability of high-speed railway subgrade.To ensure the quality of laying ballastless track on the subgrade,subgrade set
研究一种杜仲橡胶(TPI)与天然橡胶(NR)共混硫化胶性能及其在汽车减振制品扭力梁铰接中的应用。结果表明,在原天然橡胶体系中并用少量杜仲橡胶,可以在保持原胶料物理性能基本不变的情况下,大幅提高天然橡胶的伸张疲劳性能、耐屈挠性能和动态力学性能,并且能够显著改善汽车扭力梁铰接的耐疲劳性能,在汽车减振橡胶件的应用前景令人期待。
本文主要介绍我司汽车变速器齿轮渗碳淬火、渗碳不均及表面挂彩的课题。分析验证结果表明,齿轮表面覆盖热前切削液等残留物,因工艺设备的特殊性,炉内无法烧损并阻碍渗碳。通过分析验证采取成本最优的对策,即试验选择不阻碍渗碳的新型切削液,解决此问题。
铜基和纸基是干式离合器常用的摩擦材料,针对摩擦副局部接触状态以及摩擦材料特性制定加载工况,利用摩擦磨损试验机UMT-5进行销-盘试验,分析铜基、纸基两种摩擦材料的干摩擦性能差异.结果表明:铜基摩擦材料随着面压的升高,摩擦系数呈线性减小,纸基摩擦材料在面压低于2.8MPa时,摩擦系数大体呈线性增加,当面压为4.2MPa时,摩擦系数迅速减小到0.058;相对速度对铜基摩擦系数的影响较小,纸基摩擦系数在
The panel acoustic contribution analysis(PACA)methodology plays an important role in noise control of vehicle inside.Taking into account the contribution of pressure component to the field point sound
Using the model test technology of the rock-socketed pile in soft rock in consideration of the influence of the overburden,the physical model test with different overburden pressure and different rock
This work studies the effects of fine aggregate characteristics on the mechanical properties of fly ash-based geopolymer mortar.Fine aggregate characteristics consist of content and gradation.
Construction is a labour-intensive industry,meaning that employees are valuable resource to construction firms.Yet,challenges exist in todays workforce in terms of recruiting and retaining quality emp