A low-cost testbed of underwater mobile sensing network

Comprised by a swarm of acoustically linked and cooperative autonomous underwater vehicles (AUVs) with onboard sensors, an underwater mobile sensing network (UMSN) will be a complementary means to fixed observatory networks, e.g. seafloor observatory networks and moored buoy arrays. It has obvious advantages over a single large AUV in higher efficiency due to parallel observation, stronger robustness to vehicle failures and lower cost. Although an UMSN can be viewed as a counterpart of wireless mobile sensing networks for air and terrestrial applications, it is much more challenging due to poor performance of underwater acoustic communication, poor performance of underwater positioning and high degree of uncertainty in vehicle dynamics and underwater environment. In order to verify key technologies involved in an UMSN, e.g. cooperation of multi-AUVs based on acoustic communication, a low cost testbed has been developed for experimental study. The design of both hardware and software is introduced. Also the results of a functional test for verification of the effectiveness of the testbed are presented.     

基于聚类分析的我国港口城市类型化研究

港口城市的研究备受关注,但是关于港口城市类型化的研究还尚属空白。将聚类分析的思想和方法引入到港口城市这一领域,根据港城关系演变的特点,运用分层聚类法（Hierarchical cluster）,把我国25个主要的国家级港口城市分为3大类、5亚类,总结出不同类型的基本特征,并针对不同类型港口城市港城关系的调整提出了相应的建议。     

Determining the hydrodynamic forces on a planing hull in steady motion

A combination of methods was developed that can determine hydrodynamic forces on a planing hull in steady motion. Firstly, a potential-based boundary-element method was used to calculate the hydrodynamic pressure, induced resistance and lift. Then the frictional resistance component was determined by the viscous boundary layer theory. Finally, a particular empirical technique was applied, to determine the region of upwash geometry and determine spray resistance. Case studies involving four models of Series 62 planing craft were run. These showed that the suggested method is efficient and capable, with results that are in good agreement with experimental measurements over a wide range of volumetric Froude numbers.     

地铁车站低压配电室方案研究

针对国内地铁车站低压配电系统的供电方式,结合车站两端供电设备及负荷情况,提出在远离降压所的一端设置低压配电室的方案,并进行了技术、经济比较.     

预应力钢-混凝土连续组合梁的挠度研究

将连续梁分解成有端弯矩作用的简支梁,对简支梁沿界面分离成有界面力作用的钢梁和混凝土梁,假定界面力为沿切向和法向的任意分布函数,建立分离体在界面力和外荷载作用下的弯矩、轴力方程。根据分离体挠曲变形协调,导出界面切向力与法向力关系方程,联立连接件的剪力滑移物理方程,解得界面力及滑移分布函数。以连续梁内支座截面两侧的滑移应变及挠曲线的二阶导数相等为补充边界条件,求得考虑界面滑移的连续组合梁挠曲线方程理论解。     

油船货油装卸操作模拟器的系统设计

油船货油装卸操作模拟器是我们自行开发研制的用于培训油船船员的大型仿真系统。针对该模拟器的功能、要求及特点,本文主要论述了该模拟系统的硬件拓扑结构、并行智能化的软件内核设计以及模拟器的各项仿真作业功能     

智能公交电子站牌显示时间预测方法研究

公共交通智能化调度系统是利用先进的技术手段，动态地获取实时公共交通信息，实现对公交车辆的实时监控和调度，这是公交调度的新模式。公交站点间运行时间预测是城市公共交通智能化调度最重要的工作。研究了基于智能化调度系统的公交电子站牌显示时间的预测理论、模型和方法，旨在为推进我国智能公交系统的快速发展奠定基础。     

搅拌设备液压传动系统的探讨

根据搅拌过程的工作特点,讨论了搅拌设备的液压传动系统方案,给出了液压系统原理图.研究表明,搅拌设备的机、电、液一体化是实现智能化的必要条件之一;搅拌设备的液压传动系统应采用变量泵-定量马达容积调速回路.     

双横臂扭杆悬架的特性分析及设计计算

采用复数法分析了双横臂扭杆悬架的运动特性，并建立了整套设计计算方法，其中包括主销内倾角、车轮外倾角、轮距、悬架中心和侧倾中心以及悬架刚度等参数随车轮载荷变化的关系特性。     

基于多级关联灰度模型的公路建设社会经济环境影响评价

为合理分析公路建设对社会、经济环境的影响 ,项目援用区域可持续发展理论构建公路建设社会、经济环境影响评价体系 ;引入多级关联灰度数学模型和客观定权方法 ,将评价体系作为一个完整的系统进行评价 ,并在此基础上给出了实例。