橡胶产品在城市轨道交通中的应用

现代城市轨道交通结构已大量使用橡胶产品作为减振降噪元件。本文详细介绍了橡胶产品在城市轨道交通中的应用情况，内容包括产品结构、使用工况、功能特性及产品的减振降噪效果。     

机动车辆用粘弹性减震材料

文中介绍的阻尼材料具有强度高、弹性模量低、减震性能好,且阻尼性能与环境温度的相关性小等优点。它不仅适合于制造车辆用减震器,而且还适合于建筑物抗地震用隔震器、减震壁等场合。     

汽车前减震器用橡胶减震垫的研制

汽车前减震器用于汽车前桥与车身之间的减震。本工作探讨汽车前减震器用橡胶减震垫（结构如图1所示）的研制。     

基于城市轨道交通的网络信息平台的探讨

城市轨道交通网络信息平台是城市轨道交通的发展的必要阶段和重要基础。依托这一平台可以完成轨道交通系统的日常监管,也可以在紧急情况统一协调控制组织应急方案。网络信息平台对城市轨道交通的调动协调操作、资源及时共享、安保应急决策等都有重要意义。     

试验方法对重载扣件弹性垫板性能检测的影响

以重载扣件弹性垫板为例,通过对其静刚度和疲劳性能进行试验,分析了影响静刚度的主要参数。结果表明,打表位置、加载头面积和紧固扭矩是影响弹性垫板静刚度性能的关键因素,紧固扭矩对弹性垫板的节点刚度和疲劳性能的影响较大。     

BIM在城市轨道交通设计阶段的应用

城市轨道交通工程在我国城市化的进程建设有着重要的意义,它关系到我国国计民生的市政工程建设。近些年来,随着对城市轨道交通工程的不断发展,与之相关的新设备、新技术、新理念也层出不穷。城市轨道交通工程技术不仅难度高,而且施工复杂,在工程建设中应用BIM技术,能够实现施工管理的精细化、信息化。本文以BIM技术为核心,探讨BIM技术在城市轨道交通项目设计阶段的主要应用。     

橡胶用炭黑着色强度试验方法的探讨

本文主要对炭黑着色强度试验方法进行讨论。除了操作者的熟练程度、操作环境、药品的质量外,主要讨论着色强度试验使用的反射仪的校正。对着色强度的准确性进行了一些探讨性的对比试验,并且提出个人一些不成熟的见解。     

城市轨道交通专业英语课堂教学模式改革初探

文章通过总结分析问卷调查,分析了目前高职院校的城市轨道交通类专业英语教学的现状,从基于职业需求的人才培养角度出发,对城市轨道交通专业英语课堂教学模式的改革进行了探讨。     

新一代智能化城市轨道交通牵引供电系统关键技术

当前我国北京交通大学联合多家单位,共同参与我国新一代智能化城市轨道交通牵引供电系统关键技术的研发探索,并构建多个创新以及转化平台,从而努力探究该系统的具体发展方向,致力于相关技术的创新和应用。经过多年努力在2011年,交通牵引供电系统出现在公众的视野之中,经过之后几年的发展,该系统又陆续加入相关的例如整流、分散补偿、智能融冰等技术,同时还在2017年成功的加入智能化技术。而本文就是在此基础上对我国的交通牵引供电系统进行了相关的论述。     

降低乙炔发生系统阻力的有效方法

新疆天业石河子中发化工有限责任公司因乙炔发生系统阻力高而引发了一系列安全隐患,通过查找并分析可知,乙炔发生系统阻力增加是由于清洗器清洗效果差造成1#冷却塔结垢严重、废水结垢堵塞填料而引起的。改造清洗器、冷却塔内部结构后,提高了清洗器的清洗效果,2#冷却塔中填料无结垢。     

无添加防腐剂的刺激性及其改善方法

通过鸡胚绒毛尿囊膜试验(HET-CAM)研究几款无添加防腐剂与传统防腐剂的刺激性强度,并寻找能够降低刺激性的方法。用HET-CAM方法对9种防腐剂的刺激性进行检测,通过刺激评分(IS)法对无添加防腐剂和传统防腐剂进行测评发现,部分无添加防腐剂和传统防腐剂均存在刺激性。针对有刺激性的防腐剂,进行了改善性探讨,最终发现多种舒缓原料可以降低绝大部分防腐剂刺激性。     

涂膜附着力试验方法与测试仪器

介绍了目前国内外涂膜附着力测定的通用试验方法及其技术特征,探讨了与其试验方法配套的多种测试仪器的应用性能。     

漆膜干燥性能的测定方法

漆膜的干燥性能非常重要.本文简要介绍了漆膜干燥时间的测定方法,包括表干时间、实干时间以及回黏性、无印痕和码垛性试验方法.     

Rheological methods for characterising modern paint systems

In this paper the most important measuring methods for studying the rheological behaviour of modern paint systems will be presented (oscillation tests, determination of low yield points). In a first part the different methods were used to describe the rheological/physical properties of model polyurethane microgels. A second part deals with rheological investigations of effect development (light–dark flop) in waterborne pearlescent/coloured pigment systems. The measured values for storage modulus G′, phase shift δ and yield point were compared with flop-index values. The results show good correlations between the observable effect and the rheological parameters of the liquid paint. The third part presents measurements of powder and electrodeposition coatings and of clearcoats with the oscillation technique to determine the viscosity–temperature behaviour. The results were correlated with technical properties of the final films.     

Quasi-Newton methods for convergence acceleration of cyclic systems

This paper describes a version of Quasi-Newton methods for solving a set of non-linear algebraic equations. This method is simple, efficient, and requires little computer storage. This makes it suitable for the calculations of recycle streams in the simulation of chemical processes. Two examples are worked out to illustrate the good convergence of the present method as compared to commonly used methods.     

Direct methods for consistent initialization of DAE systems

Rigorous techniques for consistent initialization of differential–algebraic systems (DAEs) are in general difficult to apply. Even worse, since initialization algorithms generally require the solution of a set of non-linear algebraic equations, they may not even converge. Hence, simpler approaches for initialization are of considerable interest in the numerical implementation of DAE models. In this contribution, it is proposed a simple and effective initialization technique, which is based on the assumption that the dynamic response of a mathematical model may be approximated by the response to discontinuous perturbations of a similar system, originally in steady state. Determining the analogous system and smoothening adequately those perturbations are the key aspects for the consistent initialization of the DAEs involved. The technique presented has been tested in several examples, always yielding encouraging results.     

Analysis of multivariate statistical methods for continuous systems

The approach to process monitoring known as multivariate statistical process control (MSPC) has developed as a distinct technology, closely related to the field of fault detection and isolation. A body of technical research and industrial applications indicate a unique applicability to complex large scale processes, but has paid relatively little attention to generic live process issues. In this paper, the impact of various classes of generic abnormality in the operation of continuous process plants on MSPC monitoring is investigated. It is shown how the effectiveness of the MSPC approach may be understood in terms of model and signal-based fault detection methods, and how the multivariate tools may be configured to maximise their effectiveness.     

压缩机缸头螺栓断裂分析

通过对断裂螺栓成分、拉伸强度、断口、受力的分析及现场测量数据,找出丙烯往复式压缩机缸头螺栓断裂原因,并提出预防措施。     

轮胎用纤维骨架材料性能测试方法

介绍轮胎用纤维骨架材料性能的标准和非标准测试方法.重点从动态力学性能、耐疲劳性能和抗冲击性能3个方面对非标准方法进行介绍.纤维帘线耐疲劳性能的6种试验方法依次是Mallory胶管、U.S胶管、固特里奇盘形疲劳、费尔斯通压缩-屈挠疲劳、登录普疲劳和德里西亚屈挠疲劳试验方法.