三体两栖潮间带风电运维船的概念设计

针对三体船性能特点和我国海上潮间带风电场涨潮有水、退潮无水的特殊情况,以及目前尚无出入潮间带风电场专用设备的现状,为了保证海上潮间带风电场风电机组正常运行和维护工作的实施,进行三体两栖运维船方案构思和两栖船的水陆驱动方式的确定。运用CFD软件建立三维数值水池,考虑不同侧体布局的船型方案,通过对快速性能和耐波性能的仿真计算,最终确定性能较优的船型。对三体风电维护船的船型设计和风电运营效率的提高有较大的现实意义。     

浅析ZPW-2000A型移频轨道电路维修及故障处理

简单介绍了ZPW-2000A无绝缘移频轨道电路原理。针对该系统的故障特点,讨论故障判断和维修处理建议,并总结了日常维修的一般方法。     

GIS系统在内河航道维护管理中的应用

文章基于GIS航道地理信息系统的基本理论,介绍了GIS系统在航道管理中的用途,并结合广西GIS数字航道系统应用实例,分析了系统应用中存在的问题及解决对策,探讨了GIS系统在航道管理中的应用前景。     

锤击碎化法在砼路面小修养护中的应用

文章结合工程实例,介绍了锤击碎化法在水泥混凝土路面局部小修养护中的施工工艺,并通过锤击碎化法与其它局部小修方法的对比分析,提出了锤击碎化法的改进建议。     

Evaluating the effects of climate change on road maintenance intervention strategies and Life-Cycle Costs

Climate change has the potential to impact long-term road pavement performance. Consequently, to maintain pavements within the same ranges of serviceability as before, current pavement maintenance strategies need to be re-assessed and, if necessary, changed. Changes in maintenance may lead to different agency costs and user costs as a consequence. This paper commences by defining an assessment procedure, showing how maintenance intervention strategies and Life-Cycle Costs (LCC) may be affected by future climate. A typical Virginia flexible pavement structure and anticipated climate change was used as an example. This example is believed to be representative for a great number of localities in the United States. A method using historical climatic data and climate change projections to predict pavement performance using Mechanistic-Empirical Pavement Design Guide (MEPDG) under current or future climate was introduced. Based on pavement performance prediction, maintenance interventions were planned and optimized. The maintenance effects of three treatments (thin overlay, thin overlay with an intermediate layer, and mill & fill) were considered. A Life-Cycle Cost analysis is reported that used binary non-linear programming to minimize the costs (either agency costs or total costs) by optimizing intervention strategies in terms of type and application time. By these means, the differences in maintenance planning and LCC under current and future climate can be derived. It was found, that for this simplified case study, pavement maintenance and LCC may be affected by climate change Optimized maintenance may improve resilience to climate change in terms of intervention strategy and LCC, compared to responsive maintenance.     

路面检测评价与养护决策应用

传统的公路养护决策方法是以人工调查、主观决策为主的经验型决策模式。现代化路面检测车能够完成对道路路况快速、无损检测,快速准确地获取道路使用信息,从而为养护决策提供依据。本文以辽宁某干线公路路段为研究对象,通过自动化检测对路面各项技术状况指标进行检测,对检测数据进行统计分析,根据路段特点确定养护大中修性质。采用综合检测技术辅助路面养护决策是未来路面养护的发展方向。     

Factoring a real value of cargo in port investment and funding decisions

Ports are marine gateways to economic activities. Ports’ ability to perform services depends on their facilities, harbor conditions, and other factors. Generally, ports have control over their facilities but must compete for funding to improve them. As for waterways, in the U.S., a Harbor Maintenance Trust Fund was established to fund dredging, which levies a 0.125% cargo value tax on most shippers using U.S. coastal and Great Lakes harbors. Yet, commonly, a gross tonnage metric is used to allocate the fund’s resources, resulting in under-maintenance of some harbors. This, reportedly, deters additional port funding and hinders valuable commerce. Supplemental economic metrics, such as value of commerce or cargo, can improve port financing decisions, but such data is not readily available. Container ports collect cargo value data in nominal terms, but bulk ports do not. When making economic decisions, however, real values must be used. Further, when allocating resources, decision-makers must be able to assess ports over time and relative to each other. Conforming to these criteria, this paper develops three port financing indicators based on a real value of cargo and illustrates their calculations using the U.S. Port of Duluth-Superior as a case study.     

别克轿车4T65-E型自动变速器的使用与维修

上海通用汽车有限公司生产的别克轿车，采用了美国通用公司１９９６年投产的４Ｔ６５－Ｅ型４档的电控自动变速器。由于变速器与发动机共同由ＰＣＭ控制，所以发动机与变速器完全同步协调工作，介绍了该变速器的组成、结构、工作原理，以及使用与维修 。     

CTS2型道岔转辙机安装与维护

CTS2型道岔转辙机是国内专用于青藏铁路的新型轨枕式道岔转辙机。结合现场施工实践，总结了CTS2型道岔转辙机安装的组成、工作原理、安装方法及维护方法，为同类设备的安装和维护提供参考。     

浅谈TMIS数字电路的维护与测试

TMJS 网络是铁路信息化的基础,为保证铁路运输安全、正点、高效发挥着不可替代的作用。本文就日常维护中如何尽快判断 TMIS 网络故障、通道传输质量以及2M 数字电路的误码测试方法等方面进行了较为详尽的阐述。