Dynamic response analysis of towed cable during deployment/retrieval

A numerical approach was developed to analyze the transient behavior of towed cable during ac- tively controlled deployment/retrieval (DR). The cable motion is described by the lumped parameter method, its corresponding boundary conditions are presented. In view of its varying length during DR, two auxiliary arguments are introduced to describe its continuous varying length and discrete number of nodes(equations), the length is determined by the pay out(or reel-in) rate, which is then used to determine the node number by a logic relation. For the discrete mathematical model of towed cable, an algorithm was developed to deal with the discrete governing equations. The simulation results indicate that the cable experiences more com- plex motions due to its varying length, and tension fluctuates seriously in the startup and ending stage of deployment/retrieval. The effect of towing ship's motion in waves on cable during deployment/retrieval is also considered via numerical simulation.     

On real reward testing

We extend the traditional nonnegative reward testing with negative rewards. In this new testing framework, may preorder and must preorder are the inverse of each other. More surprisingly, it turns out that the real reward must testing is no more powerful than the nonnegative reward testing, at least for finite processes. In order to prove that result, we exploit an important property of failure simulation about the inclusion of the testing outcomes between two related processes.     

轻质GMT在汽车顶棚中的应用

聚苯乙烯（PS）泡沫、聚氨酯（PU）泡沫、麻板、轻质玻璃纤维增强聚丙烯（GMT）在国内外汽车顶棚中得到了大量应用。文中通过实验对比分析各种顶棚材料,特别是PU复合板材料和轻质GMT材料,表明轻质GMT具有环保、可反复回收利用、力学性能和吸音性能优异、导热系数低等诸多应用优势。     

GK1c型机车柴油机缸头横臂导杆断裂故障分析及对策

分析了GK1c型内燃机车240ZJ柴油机缸头横臂导杆断裂的原因，提出了相应对策，取得了明显效果。     

浅谈影响汽车涂装质量因素与管控方案

现在汽车行业竞争越来越大,汽车的性能不断提高,越来越注重外观,特别是为了优化涂漆表面的涂膜环境。汽车必须能适应各种天气状况的变化,例如高温,高湿,高盐雾,寒冷的天气。当然,汽车漆的好坏会影响行业竞争,汽车竞争的强烈程度取决于汽车漆产品的好坏。汽车油漆的质量不是通过生产,而是经过设计的,产品设计过程决定着油漆的好坏。为了让喷漆质量更好,有必要对喷漆过程进行质量控制统计分析,找出影响喷漆质量重要因素,并优化汽车行业的产品。     

主机隔振器刚度对船舶推进轴系冲击特性的影响

针对船舶轴系抗冲击的具体情况,建立了包括主机及其隔振器系统的有限元模型和运动微分方程,对主机隔振器采用不同刚度时轴系的冲击位移响应进行了计算,并分析了隔振器刚度值对冲击响应的影响.     

南京地铁线路维护的实践与探讨

介绍南京地铁线路设备的概况与特点，列举在维护过程中遇到的主要问题，分析原因，提出现场解决办法，并对设计和施工提出建议。     

Torque control allocation based on constrained optimization with regenerative braking for electric vehicles

This paper proposes a constrained optimization-based torque control allocation method aimed to improve energy efficiency, and thus, driving range for electric vehicles. In the proposed method, the cost function is defined not only to achieve desired yaw moment for vehicle handling and stability, but also to minimize power losses for energy efficiency. The particular attention is paid to the power losses due to tire slips both longitudinally and laterally. The constraints are also set based on thorough investigation on various causes of power disppation such that the torque is allocated with restraint to use regenerative braking in its maximum capacity. The proposed control allocation method has been tested and verified to be effective on energy efficiency improvement through both simulation and experiment under various driving maneuvers.     

全球定位技术在大型桥梁变形观测中的应用

为检验大型桥梁设计和施工质量,大型桥梁竣工验收必须进行变形观测实验,以确保大桥的安全运行。文章以润扬大桥验收工程中动静载实验为例,介绍了利用全球定位技术测量桥梁位移变形的方法和实现途径。测试实验结果表明,全球定位技术在大型桥梁变形观察中可靠性较高,有较好的应用前景。     

江门海事局主动服务地方“绿色拆船”经济发展

“世界拆船看亚洲,亚洲拆船看中国,中国拆船看新会”。新会,著名侨乡江门市属下的一个区,地处广东省珠江三角洲西部,南临南海,毗邻港澳,通江达海,坐拥“黄金水道”银洲湖,具有良好的区位优势,具有发展拆船业得天独厚的自然条件。