带整流负载同步发电机阻尼绕组研究

阻尼绕组对发动机短路电流值大小起着决定性的影响,本文就阻尼绕组对同步发电机整流系统直流侧短路时的最大短路电流及对基本波形的影响分析别进行了分析计算和试验验证,得出了无限尼绕组同步发电机整流系统直流侧短路电流值较有阻尼绕组同步发电机有明显下降;阻尼绕组具有改善同步发电机整流系统交直流测电压波形的作用,去掉阻尼绕组使得交流电压波形谐波含量增大,波形畸变加剧;ｑ绕组对改善电压波形效果明显,可以弥补减弱阻     

京津城际高速铁路综合视频监控系统建设初探

本文针对京津城际高速铁路建设的实际安全防灾需要,采用先进的视频编码、视频智能分析技术以及网络传输技术,设计综合视频监控系统.文章介绍京津城际沿线摄像头的布点方案和工程实施方案.     

钻井平台综合信息系统体系结构研究

钻井平台综合监控管理系统是钻井平台上实施信息管理、综合监控、系统操控和平台安全监管的集成系统。系统将分散设备的有关监控、操控等功能进行集成,构建一个高度信息化、自动化的集成系统,实现平台操控自动化。目的是对钻井平台信息的集中监视和管理,提高平台的安全性与经济性。通过参考海洋平台综合监控系统、综合船桥等系统,提出了钻井平台综合监控管理系统,建立了系统的三维体系结构,填补国内在该领域的研究空白。     

船上实施听力保护的技术要求及其应用研究

实施听力保护是为降低船员听力损害风险而采取的常用措施。为了获得理想的听力保护效果,首先要考虑的是灵活的保护方式和适用的保护标准。在分析这些要素的基础上,通过研究强调了船上实施听力保护的技术要点,探讨了佩戴听力保护器的船员的作业安全问题,并对实施听力保护条件下的船员听力损伤风险评估提出了建议。     

对城乡公交一体化体系框架的研究

在城乡一元化发展的时代背景下,文章首先从运输方式和研究内容上,对城乡公交一体化的体系框架进行了介绍,并结合我国客运发展的实际水平,提出在城市与乡镇之间应采取严格的公交运营方案;在乡镇与行政村之问亦采取公交化的运营策略.在此基础上,从区域、城区、乡镇、行政村4个层面,对城乡公交一体化应重点解决的问题进行了深入分析,并形成...     

Study on a new method for installing a monopile and a fully integrated offshore wind turbine structure

This paper presents a preliminary technical feasibility study on a new methodology proposed for installing a monopile-based bottom supported offshore wind turbine structure. The concept is developed to address the problem of “waiting for a suitable weather window” which is commonly faced by the existing installation methods that uses a typical jack-up platform. In the methodology, a floating vessel along with a floatable subsea structure fitted with a hull on the top, hereafter named SSIP (subsea structure for installing a pile), is proposed first to install a monopile. Then the same structure is used to carry an FIUS (fully integrated upper structure) of an offshore wind turbine, which is characterized by a telescopic tower, and install it over the monopile by using an FOP (float-over-pulling) arrangement. Here, the installation methodologies are first briefly described along with the critical load cases associated with them. These load cases are then numerically studied for a significant wave height (H_S) of 2.5 m, and the results are summarized. For installing a fully integrated offshore wind turbine upper structure on a monopile foundation by the FOP method, two installation schemes are presented, and their dynamic characteristics are compared. It is shown that the proposed methodologies have potential to provide installation solutions which can be environmentally more robust compared to the existing method for installing an offshore wind turbine.