基于彩色二值化的车牌定位方法

提出了一种基于彩色二值化的车牌定位方法。首先将彩色图像从RGB颜色空间转换到HSI颜色空间,同时生成一个与彩色图像大小相同的二值化状态特征矩阵,根据车牌的色彩特征,调整状态特征矩阵;再用数学形态学方法对状态特征矩阵进行填充空洞和滤除噪声的处理,并根据车牌的几何特征除去伪牌照区。该方法将图像的色彩特征与状态特征分离,充分利用车牌的色彩特征调整彩色图像的状态特征,并融合了数学形态学方法;而且将车牌的色彩特征和几何特征进行了有机的结合。实验结果表明该方法是一种有效的车牌定位方法。     

泼河大桥的构造与施工

介绍我国第一座波形钢腹板PC连续箱梁公路桥——泼河大桥的施工过程。简述泼河大桥的结构特点和施工方法。     

交通拥挤收费经济学原理研究

针对交通拥挤收费合理性的争议．从经济学的角度对城市道路属性、边际费用和边际成本定价原理等方面进行分析，指出拥挤收费通过价格这种市场的手段使外部成本内部化，是一种理性的回归。交通拥挤收费使城市道路这种稀缺资源的产权得到了确定，为市场有效地配置这种资源提供了保障．也为解决日益严重的交通拥挤问题提供了一个很好的思路。     

冷却机液压挡轮装置中关键部件的有限元分析

在冷却机简体上行与下行2种工况条件下对液压挡轮装置中的关键部件进行有限元仿真分析.介绍分析中所涉及的相关数值理论基础,并叙述了仿真计算前的一些关键前处理工作,研究了滑座主体与液压缸之间采用铰接后滑座和导向轴的受力及变形情况,验证了装置改进后所取得的改良效果.     

相机视频图像自适应对比度增强系统的研制

介绍了基于图像处理方法的自适应对比度增强系统的组成、工作原理、硬件电路设计与软件设计.针对监察相机工作环境照度变化范围大的特点,提出一种改进的灰度直方图均衡化方法.应用此方法所研制的系统,能够自适应于多种光照条件下获得的低对比度图像,自动进行对比度调整,改善监察相机输出视频图像的质量.对于清晰图像,经调整后图像质量至少无明显降低.     

对我院船型开发与技术发展的一些思考

介绍了国际造船界的船型开发情况,分析了上海船舶研究设计院的船型研发现状,并提出了今后发展的建议.     

Robust optimisation of railway crossing geometry

This paper presents a methodology for improving the crossing (frog) geometry through the robust optimisation approach, wherein the variability of the design parameters within a prescribed tolerance is included in the optimisation problem. Here, the crossing geometry is defined by parameterising the B-spline represented cross-sectional shape and the longitudinal height profile of the nose rail. The dynamic performance of the crossing is evaluated considering the variation of wheel profiles and track alignment. A multipoint approximation method (MAM) is applied in solving the optimisation problem of minimising the contact pressure during the wheel–rail contact and constraining the location of wheel transition at the crossing. To clarify the difference between the robust optimisation and the normal deterministic optimisation approaches, the optimisation problems are solved in both approaches. The results show that the deterministic optimum fails under slight change of the design variables; the robust optimum, however, has improved and robust performance.     

基于SRtP的大型邮轮湿式水消防系统设计技术

船舶的火灾安全隐患及其对应的灭火措施,一直都是船舶安全设计过程中需要考虑的主要内容.邮轮船型在IMO相关要求下,需要满足安全返港规范(SRtP)要求,而消防灭火系统的设计则更显重要且复杂.通过对消防系统以及SRtP规范的研究,理清上述规范对消防系统设计的要求,并结合实船项目进行解读,探讨大型邮轮水消防系统设计理念,总结...     

大型全回转起重机滚子夹套式回转支承装置的承载滚轮轮压分布研究

讨论大型全回转起重机滚子夹套式回转支承装置的承载正滚轮和工作性反滚轮的理论轮压计算方法,并通过实例计算与ANSYS有限元计算结果进行比较,找出两种计算方法的差异,分析其中的原因。     

智能水下机器人的建模和控制策略研究(英文)

To provide a suitable model for AUV simulation and control purposes, a general nonlinear dynamic model including a novel thruster hydrodynamics model was derived. Based on the modeling method, the “AUV-XX” simulation platform was established to carry out fundamental tests on its motion characteristics, stability, and controllability. A motion control strategy consisting of both position and speed control in a horizontal plane was designed for different task assignments of underwater vehicles. Combined control of heave and pitch was adopted to compensate for the reduction of vertical tunnel thrusters when the vehicle is moving at a high speed. An improved S-surface controller based on the capacitor plate model was developed with flexible gain selections made possible by different forms of restricting the error and changing the rate of the error. Simulation results show that the derived general mathematical model together with simulation platform can provide a test bed for fundamental tests of motion control. Additionally, the capacitor plate model S-surface control shows a good performance in guiding the vehicle to achieve the desired position and speed with sufficient accuracy.