跨座式单轨系统的道岔辅助防护系统研究

跨座式单轨作为中运量的城市轨道交通系统,它主要通过信号系统控制列车运行并同时保障列车的安全;当信号系统故障时,跨座式单轨系统的工作人员必须通过瞭望、人工准备进路组织行车,此时如果出现人员失误,会造成列车掉下轨道梁等事故,导致严重的人员伤亡.为提高跨座式单轨的安全性,根据跨座式单轨的特点设计一种道岔辅助防护系统,该系统能...     

高墩双线变四线道岔连续梁施工技术

金华至温州铁路扩能改造工程祯埠特大桥18#~22#墩之间设计1联4×32 m双线变四线道岔连续梁,梁面宽度由12.6 m渐变至20.72 m,箱内结构由单箱双室渐变为单箱三室。设计采用支架法施工,混凝土一次性浇筑、全梁张拉。通过对设计施工方案的优化,采用分段浇筑混凝土、全梁张拉的施工工艺,解决了高墩变截面荷载支架设计、预应力管道穿束、压浆密实度等难题,可为今后类似工程提供参考和借鉴。     

厦深铁路42号大号码道岔铺设施工工艺研究

42号大号码道岔对铺设精度及开通后的稳定性有了更高的要求,道岔的施工工艺也要求更加精准和细化。随着快速铁路网的逐步形成,大号码道岔会更频繁地使用于各条快速通道,探索一种更安全、更经济、更高效的施工工艺显得尤为重要,通过对道岔运输、装卸、铺设、焊接、精调等工序的深入研究和实践探索,并经过运营验证可行,由此提出了一套较为成熟的施工工艺,为大号码道岔铺设提供参考。     

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。     

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.     

Mathematical modelling of train–turnout interaction

The paper proposes a mathematical model of train–turnout interaction in the mid-frequency range (0–500 Hz). The model accounts for the effects of rail profile variation along the track and of local variation of track flexibility. The proposed approach is able to represent the condition of one wheel being simultaneously in contact with more than one rail, allowing the accurate prediction of the effect of wheels being transferred from one rail to another when passing over the switch toe and the crossing nose. Comprehensive results of train–turnout interaction during the negotiation of the main and the branch lines are presented, including the effect of wear of wheel/rail profiles and presence of track misalignment. In the final part of the paper, comparisons are performed between the results of numerical simulations and line measurements performed on two different turnouts for urban railway lines, showing a good agreement between experimental and numerical results.     

基于知识工程的道岔零部件设计

利用CATIA软件的知识工程进行道岔零部件的系列化设计,建立了企业的三维模型库,显著减少设计人员的重复工作量,提高设计的效率和质量。     

Study on the derailment behaviour of a railway wheelset with solid axles in a railway turnout

ABSTRACT

Dynamic wheel–rail interaction in railway turnouts is more complicated than on ordinary track. In order to evaluate the derailment behaviour of railway wheelsets in railway turnouts, this paper presents a study of dynamic wheel–rail interaction during a wheel flange climbs on the turnout rails, by applying the elasticity positioning wheelset model. A numerical model is established based on a coupled finite element method and multi-body dynamics, and applied to study the derailment behaviour of a railway wheelset in both the facing and trailing directions in a railway turnout, as well as dynamic wheel–turnout rail interaction during the wheel flange climbing on the turnout rails. The influence of the wheel–rail attack angle and the friction coefficient on the dynamic derailment behaviour is investigated through the proposed model. The results show that the derailment safety for a wheelset passing the railway turnout in facing direction is significantly lower than that for the trailing direction and the ordinary track. The possibility of derailment for the wheelset passing the railway turnout in facing and trailing directions at positive wheel–rail attack angles will increase with an increase in the attack angles, and the possibility of derailment can be reduced by decreasing the friction coefficient.     

分体式辙叉拉杆的应用

道岔护轨及辙叉部分是道岔工作的难点 ,护背距离、查照间隔即 48— 91不易控制 ,尤其是 91不易控制。岔枕由于经常改道 ,道钉眼孔扩大 ,持钉能力差而造成失效。分体式辙叉拉杆的研制 ,从根本上控制了 48—91。     

动车组与单节车侧向通过道岔动力学性能比较

根据道岔的实际尺寸和平面布置,在Simpack软件中构建变截面道岔模型,同时建立动车组和各单节车的模型.考虑轮轨之间的多点接触关系,模拟计算了动车组和单节车以80 km/h的速度侧向通过18号可动心轨式单开道岔的动力学响应.结果表明:由于车钩作用,通过转辙器区和辙叉区时,动车组瞬时横向最大冲击和单节车有一些不同;通过道岔的响应波形有较大的差别,尤其是垂向力、减载率和车体加速度.