动车组ATP对制动系统故障后的安全影响仿真分析

针对动车组部分车辆制动系统故障后,采取切除故障车辆制动力的处理方式,从安全防护曲线的生成与实际制动过程的角度出发,对在完全监控模式下的列车防护算法及制动过程进行仿真。分析单限速区段和多限速区段速度防护曲线的算法和切除部分制动力后实际制动曲线与速度防护曲线的关系,找到触发各类制动的转换点,对切除不同比例制动力后实际制动曲线进行仿真,得出不同坡度和制动初速度下、切除不同比例制动力时的制动距离。针对动车组因故障切除部分制动力后,产生过走距离,存在冒进信号点的可能,参照防护曲线生成机理,给出兼顾制动力故障的ATP安全防护方法,分析按该方法运行时对通过能力的影响。     

CTC模拟系统研究

从实用的角度出发,针对调度集中系统进行研究,提出了模拟调度集中系统的实现方法,实现了全部外部接口系统的模拟,可为调度指挥人员提供完全真实的仿真和培训平台,具有良好的应用意义。     

腕臂底座闭式锻造成型工艺研究

介绍在原有设备条件下,如何利用闭式锻造技术生产腕臂底座。介绍腕臂底座闭式锻造成型工艺的要求、流程,以及如何通过模拟分析优化模具设计、计算坯料、模拟生产等确定工艺方案。改进后的闭式腕臂底座锻造工艺,能够提高模具的寿命、产品的表面质量、锻造精度和材料利用率,降低能源消耗和劳动强度。     

列控中心仿真测试技术的发展与应用

列控中心仿真测试是确保CTCS系统安全的一项重要内容。介绍了列控中心仿真测试的意义和内容;描述了国内外铁路列控系统仿真的发展历程和研究现状;对目前国内几种主要的仿真测试模型或系统作了简介;最后还指出了当前列控中心仿真研究存在的一些不足之处。     

基于台架试验的车架扭转强度校核研究

文章主要介绍商用车车架扭转试验,并通过仿真试验对标的方式,对比台架试验与仿真模型的误差。为以后车架扭转仿真提供参考模型,并对试验数据与仿真数据的差异进行了初步的探讨,为以后的车架设计积累经验。     

Full vehicle simulation using thermomechanically coupled hybrid neural network shock absorber model

In the case of full vehicle models, the technique of multi-body simulation (MBS) is frequently used to study their highly non-linear dynamic behaviour. Many non-linearities in vehicle models are induced by force elements like springs, shock absorbers, bushings and tires. Commonly, spline functions are used to represent the force responses of these components. If the non-linear relationships are more complicated, the spline approximations are no more accurate. An alternative approach is based on empirical neural networks which are based on the mathematical approximation of measured data. It is well known that neural networks are able to represent and predict complex component responses accurately. The aim of this paper is to perform a dynamic full vehicle simulation using a thermomechanically coupled hybrid neural network shock absorber model. In this shock absorber model, the spline approach is combined with a temperature-dependent neural network. Based on a displacement-controlled excitation on a four post test rig in the ADAMS/Car MBS software, a rugged test track is simulated. In this way, the front and rear shock absorbers are dynamically loaded with comfort-relevant frequencies in the range of 0.75–30 Hz and velocity amplitudes up to 2 m/s. By the simulation, stability of the hybrid neural network model is demonstrated. Furthermore, the damping force, the vertical acceleration of the chassis and the required simulation times are compared. The standard spline approach is used as a reference.     

Numerical Simulation and Optimization Design of Electromagnetic Fields in the Electromagnetic Casting of Copper Round Billet

IntroductionInrecentyOars,e1eCtrOmngneticcontinuouscashngtechnologyhasbeenexPerimentngandusinginmostcoUntris,WhichgainedwideaPPicathasinnon-ferrOUsmetalichstry.Atthesamehme,anUmerofsCholarshavecalculatedandmeasuredelectromagneticfields.MapnehqfieldmodelsofmpOREandMSlllhasgainedwideaPPlicationsinthesemodels.Someolsemodels,suchasH-offormula,alsohaVdescribeddistributingofelectromapneticfieldinelectromngneticcontinuouscashngwellandttuly.Electromapneticcontinuouscashngwithsofucontactmoldha…     

CTCS-2级列控仿真培训平台的构建

随着中国铁路已逐步迈入高铁时代,大量新的信号设备的投入使用,对信号专业人员的素质水平提出了更高的要求.但现阶段国内信号人员培训主要以老师讲解知识点为主,培训手段和方法略显单薄,而且培训效果不好.搭建CTCS-2级列控仿真培训平台能够丰富对信号人员培训的手段和方法,满足对高速铁路列控系统的原理、设备实操和故障处理等方面的培训要求,从而提高培训质量和效果.     

基于SPH方法的电驱动减速器飞溅润滑仿真

电驱动减速器是纯电动汽车传动系统的核心部件,对其进行合理有效的润滑尤为重要。应用SPH(光滑粒子流体动力学)方法对电驱动减速器飞溅润滑仿真分析,基于SPH方法的PreonLab软件仿真分析两种不同转速工况后,处理结果显示,仿真结果与试验结果在搅油形态上具有较好的一致性,验证了该方法进行减速器飞溅润滑仿真的可行性和有效性。