船舶同步发电机与调压系统故障分析方法

介绍船舶同步发电机与调压系统故障分析方法,提出对其故障进行分类,根据故障现象找出对应类别就可快速有效寻找故障原因或故障所在,供船舶电气调试、维修人员参考.     

2010年世界船舶市场评述与展望

回顾了2010年世界船舶市场的发展,并对未来船舶市场进行了预测。随着世界经济的复苏,2010年航运市场出现反弹,虽然全年呈现震荡格局,但整体好于2009年,散货船、油船、集装箱船年平均运价均高于上年,特别是集装箱船年平均运价比上年高出一倍多。与此同时,三大船型建造市场出现轮动效应,上半年散货船引导造船市场,下半年行情有所下滑,油船订单则从第二季度开始增加,而沉寂许久的集装箱船建造市场在下半年也开始出现大量新订单。预计2011年的船舶市场将难以维持2010年的繁荣局面,但集装箱船建造市场和海工装备有望延续2010年下半年出现的良好市场行情。     

城市下穿式矩形框架隧道的力学分析

文章基于结构-荷载理论对城市下穿式矩形框架隧道进行结构模型简化,同时利用有限元软件ANSYS对隧道进行了结构力学分析。分析结果表明矩形框架隧道在拐角处受力最不利,需在结构的设计及施工中根据结构截面强度验算进行配筋加厚处理,以保证隧道结构的安全。     

下穿黄河砂卵石地层盾构隧道管片结构受力特征现场测试

为研究砂卵石地层中管片的力学行为,以兰州地铁1号线穿黄段为研究对象,采用改良的测试传感器走线方式,对管片内力及外部水压力进行现场测试,并进行相应的数值模拟。将现场测试数据与数值模拟结果对比分析,得出如下结论:1)外部水压力及管片内力受盾构施工影响最为显著的范围为距掌子面3~5环,在此范围内应加强对受拉区的监测,并采取相应措施防止管片在施工初期破损;2)外部水压力及管片内力在距掌子面6~13环时受施工影响逐渐降低,距掌子面13环后趋于稳定;3)运用梁-弹簧模型设计管片是偏于安全的,但应充分考虑施工荷载。     

Dynamic Obstacle Avoidance for Application of Human-Robot Cooperative Dispensing Medicines

For safety reasons,in the automated dispensing medicines process,robots and humans cooperate to accomplish the task of drug sorting and distribution.In this dynamic unstructured environment,such as a human-robot collaboration scenario,the safety of human,robot,and equipment in the environment is paramount.In this work,a practical and effective robot motion planning method is proposed for dynamic unstructured environments.To figure out the problems of blind zones of single depth sensor and dynamic obstacle avoidance,we first propose a method for establishing offline mapping and online fusion of multi-sensor depth images and 3D grids of the robot workspace,which is used to determine the occupation states of the 3D grids occluded by robots and obstacles and to conduct real-time estimation of the minimum distance between the robot and obstacles.Then,based on the reactive control method,the attractive and repulsive forces are calculated and transformed into robot joint velocities to avoid obstacles in real time.Finally,the robot's dynamic obstacle avoidance ability is evaluated on an experimental platform with a UR5 robot and two KinectV2 RGB-D sensors,and the effectiveness of the proposed method is verified.     

Vehicle sensor data-based analysis on the driving style differences between operating indoor simulator and on-road instrumented vehicle

Abstract

Indoor simulator and on-road instrumented vehicle are the most popular ways to analyze driving behaviors by using collected Vehicle Sensor Data (VSD). However, for a same driver, the driving performance could be different in the real world and in the simulated world. Even though many studies have been conducted to discover the differences of driving behaviors in these two circumstances, little research has focused on analyzing the differences in driving style, which can provide more integrated knowledge of a driver from the natural structure, stimulus–response mechanism, of driving behaviors. Therefore, in this paper, the driving styles in both the real world and the simulated world are extracted by implementing the nonnegative matrix factorization method on the collected VSD data. Through this analysis, the driving style differences can be quantitatively described and discussed in detail. It is found that the drivers tend to be more unstable and sometimes aggressive when driving the simulator and the deviation in the perception of temporal gap in two circumstances is also discovered. The research findings are particularly valuable to calibrate the driving simulator and construct more reliable driving behavior models.     

高寒高海拔隧道进出口海拔差下列车内外压力计算方法及应用

为研究西部艰险山区长大隧道进出口存在较大海拔差下的车内外压力计算方法，采用理论分析方法对现有平原地区车内外压力单维计算模型进行修正，使之适用于进出口存在海拔差的隧道。通过青藏铁路列车内压力实测数据的对比，验证计算方法的正确性，并在实际设计中进行应用。主要结论如下： 1）根据大气压力随海拔变化的规律，通过调整原有计算模型中每一时刻对应的基准压力、温度、密度和声速，可实现进出口存在海拔差隧道内列车内外压力的计算； 2）通过此计算方法，确定了某高海拔山岭轨道交通单线隧道断面净空面积为19.5 m2，双线隧道断面净空面积为41.5 m2，列车动态密封指数最低要求为2.5 s。     

上海港集装箱运输相关业务发展设想

目前国际集装箱运输已成立为上海港的支柱产业。如何依托集装箱运输主业，规划开拓集装箱运输延伸业务，寻求港口发展新的经济增长点，是一个值得探讨的新课题。文中就上海集装箱运输相关业务的发展现状和发展前景进行分析和探讨。     

公路隧道内供配电设备可靠性影响因素分析

潮湿、温度、振动和灰尘等环境条件是影响公路隧道内供配电设备可靠性的外在因素,供配电设备自身的设计、制造、维护过程是内在影响因素.对供配电设备可靠性的外在和内在因素进行分析,有针对性地提出改善隧道环境、合理确定设备型式和加强设备监测等可降低隧道内供配电设备故障率的措施,为设计和管理人员提供参考.     

水平向轻型井点降水在地铁基坑中的应用

苏州市区东部地质多属于以陆相为主的海陆交互相沉积物，轨道交通1号线车站基坑大多处在粉土粉砂中，如何在这种地质情况下处理钻孔灌注桩桩间涌水涌砂，就成了施工中的重要技术环节。以苏州地铁1号线西环路站为例，介绍在特殊地层分布情况下，如何运用水平向井点降水技术解决上述问题。