越野车辆差速器同步锁止机构自动控制系统模糊控制方法研究

本文采用模糊控制方法对差速器同步锁止机构自动控制系统进行了研究。建立了车辆模糊控制模型，并进行了模拟实验。模拟实验结果表明：基于模糊控制的差速器同步锁止机构自动控制系统鲁棒性强，控制效果好，系统的移植性好。     

传统弯桥微分方程求解中一个理论问题

在假定平曲线梁的平面内及平面外弯曲符合直梁的物理关系,平曲梁的扭矩与扭率的关系与直梁相同的条件下,根据微分几何理论,推导平曲线梁桥微单元轴向应变、弯曲曲率增量、扭转曲率与梁段单元位移、扭转关系的几何微分方程,构建曲梁的微分物理方程。理论分析结果表明:微分方程中曲梁的竖向弯曲曲率增量仅与曲梁的竖向变形有关,与梁体扭率无关;曲梁的扭率与曲梁的竖向变形无关。该方程与相关文献中推导和引用的曲梁微分物理方程(基本假定相同)结论不同。其原因是,推导过程中没有采用传统的几何方法,而是采用微分几何建立各变量之间的联系。     

Non-fatal spine injuries resulting from motorcycle crashes

This study aims to determine spinal injury patterns and identify crash factors commonly associated with serious spinal injury as a result of motorcycle crashes. Data was retrospectively collected from motorcyclists sustaining spinal injuries from road crashes treated at Kuala Lumpur Hospital, Malaysia, over the 5-year period from 2005 to 2009. Each patient's injuries were analyzed by reviewing his or her medical records for radiographic imaging and computed tomography scans.A total of 151 patients were included in this study, of which, males accounted for over 87%. The first lower lumbar (L1) was the most commonly injured vertebral level, followed by the adjacent thoracic vertebra (T12). Fracture to the vertebral body without dislocation was found to be the most frequently observed spinal injury pattern. Injury severities for a majority of patients (65%) were measured at Maximum Abbreviated Injury Scale (MAIS) of 2. Serious spinal injury was associated with thorax or upper-extremity injury.Prevalence of lumbar spinal injury in the study reflects a predominantly low-speed crash among the motorcyclist in the region. Motorcyclists are at greater odd to sustain severe spinal injury when directly striking an object compare to striking the ground during the crash event.     

浅谈桥梁工程大体积混凝土裂缝机理与预防措施

简单介绍了大体积混凝土的定义及类型,针对桥梁工程中大体积混凝土结构出现裂缝的现象,在综合分析其产生裂缝机理的基础上,提出了对大体积混凝土采取的控制措施,以预防裂缝的产生.     

Development of a hydraulic limited slip differential system using a pressure generator

The limited slip differential (LSD) is a device that enables the driving force to be transmitted from one slipping wheel to the other by temporarily restraining the differential function when unwanted slipping occurs on muddy or icy roads. Many types of LSD have been developed, such as mechanical lock, disk clutch, viscous coupling, torsen and multiple clutch. This study designed a new type of hydraulic LSD using a pressure generator base on a trochoid gear pump and evaluated the performance of the new design.     

浅析横向荷载作用下桩的内力及位移

结合规范及相关资料推导出桩基础在横向荷载作用下的挠曲微分方程并给出计算桩基础位移及内力的计算公式.公式的形式简单,方便用于桥梁桩基础计算.     

带转向机构HCA在杭州湾跨海大桥斜拉索减振中的应用

杭州湾跨海大桥北航道桥为主跨448m的钻石型双塔双空间索面钢箱梁斜拉桥，通航净空为47m，按双向六车道高速公路设计，设计时速100km／h。为改善行车安全性，国内首次在栏杆外侧设置了风障（高度从近塔4．27m至远塔3．4m），为了确保整桥隽秀的景观前提下开发了带转向机构的拉索减振器，对全桥拉索进行了理论分析和安装减振器后的实桥测试。     

某氢燃料车型液压助力转向系统匹配设计

随着液压助力转向系统的不断应用与发展,人们对转向系统的要求越来越高。文章结合某氢燃料车型液压助力转向系统的设计,就该系统中的转向器和电动转向泵压力和流量进行匹配设计,对转向器垂臂摆角、转向油管的内径和油罐的容积、转向直拉杆的间隙和强度等进行设计和校核,确保了转向系统的安全性和合理性。     

商用车双转向桥中间杆系优化设计

商用车双转向桥包含两个独立的转向梯形机构,它们之间的运动是通过中间杆系来传递的.在设计双转向桥转向系统时,为了避免转向桥轮胎异常磨损,需要两个转向桥的车轮转角协调变化.提出了一种对现有双转向桥中间杆系优化设计的方法,可协调车辆第一、第二转向桥的转角关系,避免了横向滑移导致的双前桥车轮转向时造成的轮胎异常磨损.