Development of a systematic and practical methodology for the design of vehicles semi-active suspension control system

In this paper, a novel systematic and practical methodology is presented for design of vehicle semi-active suspension systems. Typically, the semi-active control strategies developed to improve vehicle ride comfort and stability have a switching nature. This makes the design of the controlled suspension systems difficult and highly dependent on an extensive trial-and-error process. The proposed methodology maps the discontinuous control system model to a continuous linear region, where all the time and frequency design techniques, established in the conventional control system theory, can be applied. If the semi-active control system is designed to satisfy some ride and stability requirements, an inverse mapping offers the ultimate control law. At the end, the entire design procedure is summarised in six steps. The effectiveness of the proposed methodology in the design of a semi-active suspension system for a Cadillac SRX 2005 is demonstrated with road tests results. Real-time experiments confirm that the use of the newly developed systematic design method reduces the required time and effort in real industrial problems.     

论“险情＋避让”二元事故认定模式

介绍了“险情＋避让”二元事故认定模式的理论依据，并着重从实体和程序2方面阐述二元事故认定模式。此模式对公安机关交通管理部门事故认定自由裁量权有所制约；将有助于交通事故认定统一化、规范化。     

简析沥青混凝土路面施工中的若干技术问题

从沥青混凝土路面施工全过程出发,对实际施工中的工序、工艺技术进行了阐述,并针对施工中出现的问题提出处理措施。     

Influences on nonlinear judder vibrations of railway brakes

The paper reports on a joined research project of Knorr-Bremse, Siemens Mobility and the Institute of Robotics and Mechatronics. The goal of the project was to analyse the dynamical behaviour of friction brakes for high-speed trains. It was intended to gain insight into possible vibration mechanisms and to assess the potential for lay-out and operation improvements for future light-weight designs. In particular, the frequency range up to 250 Hz has been addressed, since the corresponding excitation is unavoidable at least to some extent and has to be considered when the brake system is designed. The study includes a comprehensive multibody simulation study and its comparison to experimental results at the test rig of Knorr-Bremse in Munich. The simulation model is adapted step by step in order to clearly identify and separate the influences on the dynamical properties of the complete brake system including its mounting. Additionally a minimal model is introduced that demonstrates some characteristics of the brake system. It turned out that the underlying knowledge is essential for the mechanical lay-out, which could be demonstrated by solving a particular vibration problem in an actual high-speed project.     

万能材料试验机测试轨下橡胶垫板静刚度准确性的措施

结合新型轨下胶垫性能检测项目，对某种万能材料试验机测试轨下橡胶垫板静刚度的原理及存在的问题进行了阐述，并针对存在的问题进行了现场试验，分析了产生问题的原因，并提出采用万能材料试验机测试轨下橡胶垫板静刚度准确性的措施。     

接触网的动态变化特性对改进施工的几点启示

接触网受气温、机车受电弓高速滑动和牵引电流剧烈波动等众多因素的影响,其状态时刻处在复杂的动态变化之中。这种动态变化直接影响接触网的质量稳定和运行安全。因此,在施工时不仅要确保接触网的静态参数满足标准要求,而且要保证这些参数的动态变化范围不超限。在分析接触网动态变化特性的基础上,提出了改进施工的几点启示,对提高接触网施工质量具有一定参考价值。     

高职计算机专业工学结合教学模式的探讨

高等职业教育作为高等教育发展中的一个类型,肩负着培养面向生产、建设、服务和管理第一线需要的高技能人才的使命。高等职业教育必然要以创设工学结合的人才培养模式为主线和总纲,来带动专业的调整整合、课程体系及内容的重构、实训基地的建设和师资队伍的建设等。     

挖泥船破损强度分析研究

对单长泥舱布置的挖泥船进行舱段破损强度分析。应用传统理论方法对船舶破损后的载荷进行计算,根据CCS的《钢质海船入级与建造规范》(2004)计算船舶两种工况的弯矩剪力,通过建立船舶舱段非线性有限元模型,计算舱段的极限强度。对以上三种计算结果进行比较分析,得出相关结论。     

基于连续弹性地基梁的轨枕静力响应研究

研究目的：针对轨枕结构形式与刚度的差异，采用轨枕静力响应的分析方法，分析轨枕弹性模量对轨道响应的影响。 研究方法：基于Winkler假定，采用连续弹性基础梁法，建立轨枕静态响应的计算方法，以轨枕刚度为影响变量，考察轨枕刚度变化时，对轨枕静态响应量，如位移，转角、弯矩和剪力等的影响。 研究结果：建立了轨枕结构静态响应分析的方法，得出了轨枕响应量的分布曲线及不同轨枕刚度对轨枕响应的影响。 研究结论：建立的轨枕静态相应分析方法能够有效地分析弹性基础上的轨枕静力响应。在弹性基础上，随着轨枕弹性模量的增加，轨枕的静态响应变化有所增强。     

土钉墙在公路边坡加固中的设计及应用

介绍了土钉墙的应用范围和设计原则,结合工程实例,对土钉墙设计参数的选取及设计步骤作了简要说明.并根据现场测试结果及检算结合经验给出具体的工程处理措施,对相关工程设计提出了一点建议.