南宁枢纽高铁信号的过渡开通

按照高铁联调联试和开通运营的条件要求,主要阐述了新建柳南客专和南黎铁路、南钦铁路引入南宁枢纽在未按设计全面完成的情况下进行信号过渡开通的方法和步骤.在工程部分建成的条件下实现高铁信号的联调联试和过渡开通,对高铁建设项目而言是一个值得研究探讨的课题和有益的尝试.     

Short-term forecasting of high-speed rail demand: A hybrid approach combining ensemble empirical mode decomposition and gray support vector machine with real-world applications in China

Short-term forecasting of high-speed rail (HSR) passenger flow provides daily ridership estimates that account for day-to-day demand variations in the near future (e.g., next week, next month). It is one of the most critical tasks in high-speed passenger rail planning, operational decision-making and dynamic operation adjustment. An accurate short-term HSR demand prediction provides a basis for effective rail revenue management. In this paper, a hybrid short-term demand forecasting approach is developed by combining the ensemble empirical mode decomposition (EEMD) and grey support vector machine (GSVM) models. There are three steps in this hybrid forecasting approach: (i) decompose short-term passenger flow data with noises into a number of intrinsic mode functions (IMFs) and a trend term; (ii) predict each IMF using GSVM calibrated by the particle swarm optimization (PSO); (iii) reconstruct the refined IMF components to produce the final predicted daily HSR passenger flow, where the PSO is also applied to achieve the optimal refactoring combination. This innovative hybrid approach is demonstrated with three typical origin–destination pairs along the Wuhan-Guangzhou HSR in China. Mean absolute percentage errors of the EEMD-GSVM predictions using testing sets are 6.7%, 5.1% and 6.5%, respectively, which are much lower than those of two existing forecasting approaches (support vector machine and autoregressive integrated moving average). Application results indicate that the proposed hybrid forecasting approach performs well in terms of prediction accuracy and is especially suitable for short-term HSR passenger flow forecasting.     

我国高速列车转向架润滑技术

根据高速列车转向架传动系统摩擦副速度和载荷的特点,轴箱轴承均采用脂润滑,传动轴承以油润滑方式为主,传动齿轮均采用油润滑方式。脂润滑设计应考虑润滑脂品牌选择、装配重量、维护保养补脂周期和换脂周期等原则。油润滑设计应考虑油粘度选取,滴油润滑方式和结构型式等原则。润滑油、脂应具备低磨耗、自修复性和故障安全导向性。论述了我国高速列车转向架润滑技术的经验、问题与需求。     

140客位沿海单体高速客船

阐述了１４０客位沿海单体高速客船的主要要素,主要技术性能,型线特征,结构特点,总布置等,并论述了本船设计特点。     

中低速磁浮交通小线间距单渡线道岔设计研究

为了减小中低速磁浮交通单渡线道岔区线路的线间距,降低工程总体造价,研究设计一种小线间距单渡线道岔。详细介绍这种小线间距单渡线道岔设计的完整思路和随动移梁装置、梁端抬轨装置的设计结构,并阐述防止单渡线道岔转动时梁端对接不发生干涉的方法及梁间合理的预留间隙。该设计采用UG软件进行转辙驱动仿真模拟,为中国首条中低速磁浮商业运营示范线工程化设计提供技术保障,为其他新型城市轨道交通制式小线间距道岔的设计提供设计理念和方法。     

基于冲击回波法识别无砟轨道混凝土结构中的蜂窝伤损深度研究

为了研究高速铁路无砟轨道混凝土结构相继出现不同程度的伤损问题,借助于有限元软件ANSYS LSDYNA 3D数值模拟冲击回波,研究应力波在轨道板中的传播速度和传播规律,采用冲击回波法识别轨道板中蜂窝伤损的深度。研究结果表明:应力波在蜂窝伤损和砂浆界面发生反射,在频谱图中形成不同峰值,通过频谱伤损定位原理可以确定出轨道板中蜂窝伤损的具体深度。     

高速铁路5×50m钢箱-混凝土连续结合梁设计研究

连续结合梁作为将钢与混凝土相组合共同参与工作的体系,受力十分复杂,应用中要确保结构具有良好的静力、动力性能。以某高速铁路5×50 m钢箱-混凝土连续结合梁为工程背景,介绍设计时对负弯矩区处理、桥面板预应力施加、混凝土徐变和活载效应、动力性能等重点问题的计算和分析,研究表明,通过调整施工顺序、采用合理的徐变及活载计算方法、底板铺设混凝土等措施,可使结构各项指标满足要求。     

高速铁路双块式无砟轨道路基地段结构设计与施工技术研究

为了提高双块式无砟轨道的设计和施工质量,首先对路基地段双块式无砟轨道道床板和支承层的功能定位进行分析,提出连续道床板和分块道床板两种结构设计方案的主要特点和设计要点,并对两种设计方案进行结构受力和配筋计算。然后从抗压强度、结构耐久性、疲劳强度、裂缝控制等要求研究道床板混凝土的强度等级,提出道床板混凝土强度采用C40是足够的,且强度不宜太高。最后结合目前双块式无砟轨道施工和运营经验,提出道床板和支承层在施工过程中应注意的一些问题。     

Simulation of dynamic interaction between train and railway turnout

Dynamic train–track interaction is more complex in railway turnouts (switches and crossings) than that in ordinary tangent or curved tracks. Multiple contacts between wheel and rail are common, and severe impact loads with broad frequency contents are induced, when nominal wheel–rail contact conditions are disturbed because of the continuous variation in rail profiles and the discontinuities in the crossing panel. The absence of transition curves at the entry and exit of the turnout, and the cant deficiency, leads to large wheel–rail contact forces and passenger discomfort when the train is switching into the turnout track. Two alternative multibody system (MBS) models of dynamic interaction between train and a standard turnout design are developed. The first model is derived using a commercial MBS software. The second model is based on a multibody dynamics formulation, which may account for the structural flexibility of train and track components (based on finite element models and coordinate reduction methods). The variation in rail profile is accounted for by sampling the cross-section of each rail at several positions along the turnout. Contact between the back of the wheel flange and the check rail, when the wheelset is steered through the crossing, is considered. Good agreement in results from the two models is observed when the track model is taken as rigid.     

建立高速铁路立体监测诊断平台适应维护管理需要

高速铁路立体监测诊断平台是在传统的信号微机监测基础上进行深度拓展和后台开发的诊断系统。介绍了平台建立的概念,条件,基本组成和主要功能,特别对电务子系统的发展应用提出了意见和建议。