半穿武钢桁梁桥横向振动TMD阻尼减振研究

针对我国既有铁路常见的半穿式钢桁粱桥的振动特性，建立了车-桥-TMD系统耦合振动方程，对采用多点调频质量阻尼器抑制既有铁路钢桁梁桥横向振动的阻尼减振方案进行了仿真计算。结果表明：TMD能有效的抑制铁路半穿式铁路钢桁梁桥的横向振动。     

上海市真如副中心轨道交通建设规划协调方案

介绍了上海真如副中心地区规划的基本情况.通过分析国内外副中心建设经验,归纳了轨道交通枢纽和副中心建设的相互作用关系.结合上海真如副中心地区的实际情况和条件,提出了调整R3线、M6线线路位置,以形成曹杨路一铜川路节点综合交通枢纽的规划方案.     

撞击参数对双层舷侧结构碰撞响应的影响

深入了解船体结构碰撞损伤特性和能量吸收机制是开展船舶耐撞性优化设计的前提。文章利用显式非线性有限元数值仿真技术对不同撞击条件下的双层舷侧结构碰撞响应进行了系列研究。研究结果表明：撞击位置、撞击角度和撞击速度的改变可能导致不同的碰撞损伤过程或结构损伤变形。     

SART标准修改对海上搜救的影响

SART是GMDSS的重要组成部分,对海上搜救发挥了关键作用.随着AIS的广泛应用,IMO对GMDSS的标准进行了修改,在原来RADAR-SART的基础上,增加了AIS-SABT.AIS-SART的实施有利于海上搜救,同时对AIS船舶的识别码管理提出了新的要求.     

浅谈港口建设项目设计阶段工程造价的控制方法

设计阶段的造价控制对整个工程投资的影响高达75％,故在设计阶段进行造价控制对港口建设项目总投资具有重要意义。介绍设计阶段进行方案优选、实行设计招投标制度、运用价值工程、实行限额设计以及设计监理等主动控制的基本方法,以合理地处理技术与经济之间的对立统一关系,达到节约总投资的目的。     

当前浮式平台船体结构分析的方法与重点综述(英文)

浮式平台概念的选择及其结构设计是深水工程项目的关键环节之一.它决定了平台在波浪载荷作用下的动力学响应、立管在深水条件下的运动以及进行平台建造与安装的技术难度等.结构强度、结构的抗疲劳性能以及结构的整体和局部稳定性能是浮式平台设计必须重点考虑的三个主要方面.总结了当前浮式平台设计的主要方法和它的主要任务以及技术要求,着重分析了设计过程中的主要技术难点及重点;最后,讨论了浮式平台结构设计的潜在发展趋势.     

水下作业机械手运动学分析与仿真

针对水下作业机械手难于实现负载能力与灵活性相统一的问题,设计了一种采用欠驱动机构的水下作业机械手,建立了该机械手的三维模型,并对机械手的工作原理和运动学特性进行了分析与仿真.从分析与仿真的结果可以看出,采用欠驱动机构可以解决机械手自由度数目、驱动方式、质量和灵活性之间的矛盾.该机械手采用液压方式实现对机械手11个自由度的驱动,具有驱动力大、结构简单、操作灵活的特点,可适应多种不同任务的水下作业需要.     

内河小型钢质船舶建造监理

江苏省航道系统针对目前我国承担内河小型钢质船舶建造业务的小型船厂普遍存在技术力量相对薄弱和质量管理控制体系不够完善的实际状况,在建造航道专用船艇时实行了内部监理制度。本文着重探讨了其监理机构设置、工作内容和方法,并通过这种监理组织与业主和船厂之间的相互关系,以及与承建项目结合的特点,讨论了江苏省航道系统内部监理制度对控制内河小型船舶建造施工工艺质量的实际效果。     

An analysis of bicycle route choice preferences in Texas,US

In the US, the rise in motorized vehicle travel has contributed to serious societal, environmental, economic, and public health problems. These problems have increased the interest in encouraging non-motorized modes of travel (walking and bicycling). The current study contributes toward this objective by identifying and evaluating the importance of attributes influencing bicyclists’ route choice preferences. Specifically, the paper examines a comprehensive set of attributes that influence bicycle route choice, including: (1) bicyclists’ characteristics, (2) on-street parking, (3) bicycle facility type and amenities, (4) roadway physical characteristics, (5) roadway functional characteristics, and (6) roadway operational characteristics. The data used in the analysis is drawn from a web-based stated preference survey of Texas bicyclists. The results of the study emphasize the importance of a comprehensive evaluation of both route-related attributes and bicyclists’ demographics in bicycle route choice decisions. The empirical results indicate that travel time (for commuters) and motorized traffic volume are the most important attributes in bicycle route choice. Other route attributes with a high impact include number of stop signs, red light, and cross-streets, speed limits, on-street parking characteristics, and whether there exists a continuous bicycle facility on the route.

A traffic analysis zone definition: a new methodology and algorithm

This paper develops a comprehensive approach to the definition of transportation analysis zones (TAZ), and therein, presents a new methodology and algorithm for the definition of TAZ embedded in geographic information systems software, improves the base algorithm with several local algorithms, and comprehensively analyses the obtained results. The results obtained are then compared to these presently used in the transportation analysis process of the Lisbon Metropolitan Area. The proposed algorithm presents a new methodology for TAZ design based on a smoothed density surface of geocoded travel demand data. The algorithm aims to minimise the loss of information when moving from a continuous representation of the origin and destination of each trip to their discrete representations through zones, and focuses on the trade-off between the statistical precision, geographical error, and the percentage of intra-zonal trips of the resulting OD matrix. The results for the Lisbon Metropolitan Area case study suggest a significant improvement in OD matrix estimates compared to current transportation analysis practises based on administrative units.