城市轨道交通预制箱梁设计概算编制

以北京市和广州市轨道交通工程为例，详细介绍了大吨位整孔预制箱梁预制和架设的概算编制方法，指出机械地套用地方市政定额是不科学和不切实际的，应根据工程的具体工艺工法借用铁路工程定额，达到合理确定工程造价的目的。     

2万吨级多用途船船型试验研究

对2万吨级多用途船船型进行了试验研究，该船与相近吨位船舶相比，傅氏数高，方型系数大，船型优化设计有一定的难度，在吸收国内外先进经验，分析上海船研所同类型多用途船船型研究资料的基础上，先后设计了2个方案的球艏线型，通过试验分析比较，优选出推荐船型。优选船型有效地解决了该船的快速性问题，性能优良，可供船舶设计及建造部门使用。     

MZ32型移动模架造桥机在秦沈客运专线的应用

秦沈客运专线小凌河特大桥主河槽 3 2m双线预应力混凝土箱梁施工采用中铁大桥局自行研制的MZ3 2型移动模架造桥机原位整孔现浇的方案 ,在铁路桥梁施工中尚属首次。简要介绍该造桥机的构造、原理、施工工艺     

全自动无人驾驶系统中的综合监控系统

介绍了服务于全自动无人驾驶系统的综合监控系统的基本工作内容及其定义,阐述了综合监控系统的基本框架,并对软件平台、实时数据库、火灾报警系统的部分集成、紧急后备操作盘等的关键性技术、对应架构进行了介绍。     

Development of a hull form definition tool with a related knowledge-based advisory system

The development of a parametric hull form design system utilizing combined knowledge-based and objectoriented methodologies, approaches, and techniques is the major purpose of this research. One objective was the development of a powerful, intuitive, and parameter-based hull definition system with a related hull definition advisory system that would provide useful and necessary advice to the user. Object and knowledge modeling activities were conducted during the analysis and design stage to facilitate the implementation of a hull design program and advisory system. The hull design system includes the generation of a geometric model from a process of aggregating simple user-selected shapes representing different boundaries. Design involves the capability to vary simple parameters such as entrance angles, length-breadth ratios, and radii to define local and general surface geometries. Hydrostatic calculations are included for analysis; results are referred to an advisory system for evaluation and the determination of the acceptability of parameters and analysis results. The advisory system includes a knowledge bases consisting of hull form databases, results of the statistical analysis of data, design parameter constraints, and expert knowledge acquired from designers, reference materials, and technical reports. Use of the design tool with the advisory system results in the rapid generation of hull forms and associated design evaluations. Flexibility in decision making results from the separation of the design system from the advisory system. The independence of the two systems allows for a wide range of user experience with experts using the design tool with minimal reference to the advisory system. On the other hand, the expertise and knowledge stored in the advisory system is fully available to inexperienced designers and users.     

Studies on the optimization of stern hull form based on a potential flow solver

A hypothesis of the minimum energy of secondary flow, suggested by Bessho, is introduced here. According to this hypothesis, it can be expected that hull forms having frame lines with a minimum energy of secondary flow show less form drag. In the first part of this article, secondary flow energy is evaluated for the cases with and without a free-surface effect, and Bessho’s hypothesis is confirmed for practical hull forms. Then optimization methods for the stern hull form are suggested, in which a nonlinear optimization technique is introduced. Numerical examples are given for a practical tanker hull form and a practical container hull form. From these studies, the suggested optimization method can be confirmed as a simplified and practical design method to the select frame lines of stern hull forms.     

基于曲面插值算法的KCS船球鼻艏形状优化

本文应用一种基于控制点阵的曲面形状控制算法改变球鼻艏的几何变形,通过增加点阵的数量,以改善球鼻艏与船体过渡的几何光顺性,运用多岛遗传算法数值设计兴波阻力最小的球鼻艏形状.针对KCS船舶,对3个不同点阵数量开展了球鼻艏形状优化设计,结果表明,增加点阵数量能有效地提高球鼻艏与船体过渡的几何光顺性,同时也保证了减阻效果,最优...     

轨道交通16号线跨S2三跨连续梁转体施工关键技术研究

该文针对挂蓝施工对工期的制约和高速公路通行的影响,结合工程实践对挂篮工艺改为转体施工过程中的关键技术进行了研究。研究成果对以后的类似工程具有一定的借鉴意义。     

三角挂篮模拟堆载预压实验研究

通过数值模拟分析和实测分析相结合的方法,对在地面拼装后开展的三角挂篮对拉预压实验开展研究,研究其与连续梁桥实际施工时挂篮结构受力、变形之间的差异,为合理选择挂篮变形在箱梁悬臂浇筑中的贡献值提供依据。研究结果表明,在地面对拼挂篮后开展的预压实验,能较好地获得预压加载过程中挂篮的应变响应,在避免荷载施加位置、锚固结构等细节与实际施工的差异并将其初始节段非线性变形合理剔除后,所得数据可以用于预拱度的计算中。     

舭龙骨结构设计及安装研究

从水动力学入手,阐述了舭龙骨的作用原理,针对常规散货船和油船,给出了舭龙骨的典型结构、构件尺寸及设计要求,并对舭龙骨的材质和各部分结构的细节要求以及安装和定位要求,尤其是对端部的要求进行了详细论述,并对舭龙骨的焊接要求作了深入研究。