Development and prospects of initial alignment method for strap-down inertial navigation system北大核心CSCD

Initial alignment technology is directly related to the navigation accuracy and startup time of the strap-down inertial navigation system (SINS), and has always been regarded as a challenging focal point in the research field of inertial navigation. This paper makes a comprehensive survey of SINS initial alignment technology, briefly introduces the basic principles of initial alignment without latitude, coarse alignment with known latitude and precise alignment, and points out their advantages, disadvantages and applicable conditions. The research and effects of existing initial alignment error suppression techniques are then analyzed and discussed. Finally, according to the problems of existing initial alignment methods and the development requirements of the carrier, the future research direction of SINS initial alignment technology is predicted. © 2022 Journal of Clinical Hepatology. All rights reserved.     

模似器在港口航道设计中的应用

阐述船舶操纵模拟器在港口航道设计中的应用情况。通过上海港外高桥挖入式港池设计研究的实例说明模拟器的成功运用。这些模拟技术和方法对于降低航道费用、增强船舶营运安全和提高港口生产效率都有较大作用。     

关键航段江海直达船舶驾驶技术探讨

此文通过对江海直达船舶的操纵性分析,从过弯曲河段航法、过桥航法、入海河口的航法三方面对关键航段江海直达船舶驾驶技术进行了探讨。     

网络数据融合技术在MITS中的应用研究

探讨了基于传感器网络的数据融合技术在海事智能交通系统(MITS)中的应用问题,为该领域的进一步研究提供一些有价值的思路和见解。基于目前研究遇到的困境,提出将MITS抽象成一个无线传感器网络(WSN),从而可在WSN环境下引入数据融合技术来研究海事智能交通系统中的各种信息处理问题,如船舶的定位与导航以及避碰等;紧接着,总结了现有定位、导航、避碰和船舶安全管理技术研究的现状并分析了存在的主要问题;针对基于GPS的MITS存在的种种弊端,结合各国卫星定位导航系统的建设现状,提出利用MITS内其它元素的信息和多源信息融合技术来实现船舶的相对定位和导航这一新思路;最后,从网络数据融合技术角度出发,具体指出了MITS网络融合系统构建时所必须考虑的一些基本问题,并给出该融合系统的一般性框架。     

Japanese perspective of driver information systems

A perspective view of of Japanese R&D activities of Driver Information Systems is given from the standpoint of developing joint projects by public and private sectors. First, a brief history of the R&D activities is illustrated from above mentioned standpoint. Then, two major projects, AMTICS and RACS, and the social backgrounds of these projects are explained. In order to give a clear idea of both projects some technical details are treated.Based on the history and the present status of the developments, the basic design conceptions of Japanese Driver Information Systems are explained and several factors or reasons which have influenced to the design conception are discussed. Then, the promoting systems of the R&D activities are generally explained and present status of the projects and future problems in developing more advanced systems are also handled. A brief discussion on the establishment of international standard is also mentioned as a final comment.     

Analysis on Uncertain Information and Actions for Preventing Collision

Discusses and analyzes the causes and characteristics of the uncertainties of the information and actions for preventing collision at sea on the basic knowledge of the collision avoidance.Describes the ways and functions of the investigations about the uncertainties of the information and actions of collision avoidance with the navigation simulators.Puts forward some suggestions for the officers to master the skills of the recognition of these uncertainties of the information and actions by the training with the sim- ulator during the MET course.     

小半径曲线脱轨原因分析及对策措施

通过对小半径曲线常见的悬浮、轨道破坏、爬轨 3种脱轨情况的特点分析 ,从工务角度着重论述小半径曲线上的超高顺坡率、轨距超限、方向水平及其反相位复合不平顺三者对行车安全的影响 ,并提出预防整治的对策措施。     

盾构在小半径曲线下穿越建筑物的施工技术

随着盾构法施工在城市地铁隧道中的应用,使得在盾构法施工中面临到的环境也越来越复杂.以上海市12号线东兰路站～虹梅路站区间隧道为工程实例,介绍了一些在盾构施工中面临小半径曲线下穿越建筑物的施工技术,对在施工过程中遇到的难点、重点进行了分析,提出了一些解决方法,对以后类似工程有一定的借鉴作用.     

基于格子Boltzmann方法的船舶风力助推转子绕流特性

风力转子推进装置节能环保,降低推力成本,有利于船舶行业的绿色发展。基于多松弛格子Boltzmann方法,对并列风力助推转子绕流进行数值模拟。首先模拟单圆柱绕流的流动特性,以验证程序的可靠性,重点探究双圆柱的间距比和转速比对圆柱绕流特性的影响。获取圆柱的升阻力系数以及尾流流型,验证临界转速比的存在。结果显示:旋转可以有效地抑制涡的生成和脱落,当转速比达到临界转速比时,漩涡彻底消失,流场变得稳定;时均升力系数的绝对值和时均阻力系数随转速比的增大分别增大和减小。     

自主式水下滑翔机关键技术专利扩展分析

为解决目前自主式水下滑翔机的导航技术、水声通信以及组网技术3个分支专利数量较少,存在一定的技术瓶颈和技术壁垒的问题,本文基于自主式水下滑翔机的功能、效果、适用等技术需求,将其研究范围扩展至水下航行器领域,通过对扩展领域中导航技术、水声通信技术以及组网技术的专利申请进行多角度分析,得到了3个分支在扩展领域的专利申请趋势、主要技术来源地、活跃度以及国内主要申请人等结论,以对自主式水下滑翔机的研究进行技术支撑。