基于μC/OS-Ⅱ的汽车CAN总线智能节点的设计

在将嵌入式操作系统μC/OS-Ⅱ成功移植到LPC2129的基础上,给出了基于ARM7内核的LPC2129汽车CAN总线硬件电路,详细阐述了基于嵌入式操作系统μC/OS-Ⅱ的智能节点软件设计方法.     

预应力板梁荷载试验

公路桥梁梁板实际承载能力的试验是施工现场有用的检测方法之一,在实际运用中,能够取得有说服力的检测数据,达到快速有效、节约成本的目的。     

基于RECURDYN的滚珠丝杠循环系统动力学仿真

基于赫兹接触理论和经典的碰撞理论,建立了滚珠丝杠工作过程中滚珠与导珠管接触碰撞的多体动力学模型,该模型充分考虑了碰撞刚度和碰撞阻尼,并考虑滚珠丝杠导珠管的外形,丝杠旋转速度等因素对碰撞力的影响。应用多体动力学软件RecurDyn根据实际物理参数建立了滚珠丝杠循环系统的几何模型,对滚珠在导珠管中的运动情况进行仿真模拟,获得了滚珠在导珠管中运动的速度加速度以及碰撞力的变化过程。理论计算与仿真试验结果基本吻合,这对于进行滚珠丝杠的优化设计以及研究开发新的滚珠丝杠副有重要意义。     

柳州市城市交通现状分析与对策研究

通过分析柳州市发展特点、交通设施、城市布局等方面的因素,对城市交通所面临的问题进行初步探讨.提出了通过加快路网建设、发展公交系统等措施解决交通困境问题.     

道路运输业增加值研究

分析了道路运输业增加值的概念及其实现过程,阐述了道路运输业增加值的两种计算方法,并对道路运输业增加值、总产值和净产值的关系进行了论述。     

Remaining Useful Life Prediction of Turbofan Engine Using Hybrid Model Based on Autoencoder and Bidirectional Long Short-Term Memory

High voltage electrostatics and corona discharge are utilized for various applications in pollution and environmental control. The traditional applications have many flaws due to improper construction of electrode design and assembly that cause system failure, in particular when electrically stimulated devices are exposed to high humidity. A new innovative-patented design by Hamade, electrically stimulated catalytic converter (ESCC), eliminates such flaws and shows the wide practical applications of the new design. The new design utilized previous patented designs and work of the same inventor but retrofitted for catalytic auto exhaust emission control. The current and previous patents include: employing electrically stimulated filtration (ESF) to replace high efficiency particulate air (HEPA) filters, treatment of biological and infectious diseases, electret fabrication, and, most notably, the invention of a new electrically stimulated catalytic converter (ESCC). The electrically stimulated catalytic converter invention includes an exhaust conduit fed from the engine exhaust port with a housed corona charger apparatus. The opposite end is opened to the atmosphere outside of the vehicle or connected to a reduced-size catalytic converter. The corona charger is intrusively or non-intrusively associated with a main flow path defined by the exhaust conduit. The corona charger includes at least one electrode, which may be recessed away from, the main flow path. A plurality of corona chargers may be used in various combinations, optimally a two dimensional grid. The electrically stimulated catalytic converter is adapted to treat and eliminate auto exhaust pollution emission to air.     

Prototype Loading Tests on Full-Ring Segmental Lining of Rectangular Shield Tunnel

A series of full-scale loading tests are performed for a prospective subway tunnel with a rectangular shape including two reliability tests: one stagger-jointed three-ring reliability test, and one ultimate failure test on a single ring. Comprehensive measuring programs are designed to record the deformation of both lining structure and joints and the stresses of concrete, bolts and reinforcements. Experimental results show that in both the single-ring and three-ring loading cases, the long sides of tunnel cross section bend inwards while the short sides of tunnel cross section bend outwards. The inner part of joints opens while the outer part of joints closes at places experiencing positive moment and vice versa. Joint’s rotational stiffness varies at different locations. Concrete cracking and crushing are the chief damage modes, and they are closely related to the distribution of bending moment. Stagger-jointed fabrication significantly increases the overall rigidity of lining system, which thereby greatly reduces the deformation of both concrete lining and joints in comparison with the single-ring case. It is shown that the routinely-used uniform rigidity model is conservative and the preliminary design can be optimized by applying an effective rigidity ratio (ERR) of 0.5.     

一座山区高墩矮塔斜拉桥的创新设计实例

山区高速公路设计经常遇到因跨越峡谷需要采用 150m ~ 300m 大跨径矮塔斜拉桥的情况, 矮塔斜拉桥桥面以上塔高通常较矮, 深沟峡谷对应梁底以下的墩高通常较高, 这就形成墩高而塔矮的比例不协调问题。 为解决这一桥梁美学的设计难题, 文章提出一种适应于高墩矮塔斜拉桥的 Y 型墩新型设计方法, 并以洪溪特大桥作为工程实践, 介绍说明其设计创新点。     

隧道内半刚性基层沥青路面有限元模型建立研究

为了完成对半刚性基层沥青路面的数值模拟研究, 文章通过建立隧道半刚性基层沥青路面有限元模型, 将有限元计算结果与 BISAR3. 0 的结果进行比较, 以研究隧道半刚性基层沥青路面有限元模型的建立。 得出以下结论： 通过比较分析 ABAQUS 与 BISAR3. 0 的计算结果, 验证了本文采用模型的正确性; 当隧道半刚性基层沥青路面三维有限元模型取路面宽 W 为 3.5 米时, 与 BISAR 算出来的结果吻合度较高。 因此, 在对半刚性基层沥青路面进行数值模拟分析时, 有限元模型取路面宽度应当取 W= 3. 5m; 计算路面结构的应力应变响应及疲劳寿命时, 要对半刚性基层进行贯通裂缝预设。 对称荷载的应力、 应变响应均小于偏载, 计算出的疲劳寿命也明显小于偏载情况, 建立的隧道半刚性基层沥青路面有限元模型应该采用偏载模式加载。     

“数”领迭变——西宁公交运营改革实践探索

西宁市是青海省政治、经济、文化和交通中心,是“一带一路”倡议通道节点城市。西宁市自创建公交都市以来,城市公共交通优先发展体系不断完善,公共交通运营保障能力和服务水平稳步提升。截至目前,西宁市常规公交线路有102条,运营线路总长度1484公里,运营车辆1940台,万人公共交通车辆保有量18.3标台,公共交通站点500米覆盖率100%,绿色公共交通车辆比率达100%,城乡客运线路公交化运营比100%。