Sea state estimation using vessel response in dynamic positioning     

《Applied Ocean Research》2018

This paper presents a novel method for estimating the sea state parameters based on the heave, roll and pitch response of a vessel conducting station keeping automatically by a dynamic positioning (DP) system, i.e., without forward speed. The proposed algorithm finds the wave spectrum estimate from the response measurements by iteratively solving a set of linear equations, and it is computationally efficient. The main vessel parameters are required as input. Apart from this the method is signal-based, with no assumptions on the wave spectrum shape. Performance of the proposed algorithm is demonstrated on full-scale experimental DP data of a vessel in three different sea states at head, bow quartering, beam, stern quartering and following sea waves, respectively.  相似文献   

手持式三维激光扫描仪在工业构件质量检测中的应用     

李毅  徐超  廖开星  赵洪瑶 《测绘通报》2019,(8):102-105

手持式三维激光扫描仪以其便携易用性在工业构件质量检测中具有广阔的应用前景。本文从前期准备、数据采集、数据处理等主要步骤出发，提出了基于手持式三维激光扫描仪的工业构件质量检测方法；并利用实际案例验证了该方法在工业构件质量检测中的精度和效率，为快速低成本的工业构件质量检测提供了思路。  相似文献   

我国依港管船机制探究          下载免费PDF全文

朱晖  张新聪 《海洋开发与管理》2019,36(7):12-19

"依港管船"制度的提出是我国对渔船管理模式的探索和创新,也是贯彻落实党的十九大精神,推进海洋生态文明的重要举措。文章通过对"依港管船"制度内涵与外延的阐述,从"依港管船"制度的法理基础与现实需求角度入手,研究其合理性与必要性。并且对国外港口建设与船舶管理制度进行分析,总结出目前日本、美国、韩国、德国等国家实施"依港管船"制度的相似性及主要差异,为我国"依港管船"制度的完善与实施提供了参照。并给出了完善"依港管船"以及"渔港生态"立法;明晰渔港产权制度;强化渔船管理制度建设;建立主管部门驻港管理机制;实行部门执法联动等对策建议。  相似文献   

Oceanographic Research Vessel Sharing Plan—A Significant Creation of the National Natural Science Foundation of China     

Ge Renfeng  Shi Maochong 《地球科学进展》2016,31(4):428-435

To settle the difficulties of the shortage of oceanographic research vessels in our country, the National Natural Science Foundation Committee of China founded Oceanographic Research Vessel Sharing Plan in 2009. It is aimed at enhancing efficiency and optimization of the vessel resources,and coordinating the use demands of vessels for the different foundation projects and the efficient use of the research vessels. We have summarized the achievements made in the Plan from 2010 to 2014, as well as the use system of the research vessels sharing, the specific operating mode ,the organization and the management framework of the Plan. In the end, we put forward our suggestions on the improvement of the Plan after the primary analysis of the present situation of the sharing of the survey data and the existing problems.  相似文献   

地质雷达在公路路面检测中的应用   总被引：18，自引：0，他引：18  

邓居智  方根显 《华东地质学院学报》1999,22(1):40-44

探讨了地质雷达在公路路面无损检测中的应用,重点介绍了野外资料采集时的参数设置和室内数据处理,以及处理后资料的解释,并给出了应用实例。  相似文献   

反射波法检测桩身完整性的一种频率域数据处理方法     

罗伟新 《物探与化探》1999,23(3):233-240

从纵波传播过程的反射和透射的基本原理出发,介绍了反射波法桩身完整性检测数据在频率域中定量确定视反射系数和反射波往返时间的一种新的理论和方法.  相似文献   

探地雷达在岩土工程中的应用   总被引：8，自引：2，他引：6  

杨顺安  刘国伟 《地质科技情报》1998,17(3):95-100

介绍了探地雷达在岩土工程中的实际应用领域及推广应用前景,在岩土工程施工检测中,如特殊地层的桩基施工中遇到的花岗岩风化孤石,隐伏奇异岩溶,地下古旧建筑基础影响桩基设计及施工;桩周空洞引起大量涌水及漏浆,造成桩基施工困难,软土强夯加固改良中的抛镇块石及块石土强夯质量检控问题等,探地雷达都是可为提供有效服务。  相似文献   

基于B/S与M/S混合架构的排水管网巡查养护WebGIS系统     

赵冬泉  王浩正  陈吉宁  盛政  张金禄 《测绘软科学研究》2010,(5):63-68

阐述了B/S（Browser/Server,浏览器/服务器）架构和M/S（Mobile/Server,移动设备/服务器）架构的特点,总结了GIS技术在排水管网管理中的应用。以城市排水管网巡查养护管理工作的需求为基础,介绍了基于B/S与M/S混合架构的城市排水管网巡查养护WebGIS系统的结构设计和功能实现,包含管网巡查、管网养护、管网应急管理等功能。将该系统应用于城市排水管网的运营管理过程,可改善目前排水管网粗放不系统的管理模式,提高城市排水管网巡查养护工作的效率和监管力度。  相似文献   

基于3S技术的土地利用现状长效管理机制     

王号  曹中初  杨珂拉 《国土资源信息化》2010,(1):63-66

本文介绍了上海市土地利用现状长效管理机制的构建思路、总体框架,及其发现——调查——处置——反馈机制。最后总结了上海市土地利用现状长效管理机制的作用和效果。  相似文献   

Railway track inspection using GPR   总被引：1，自引：0，他引：1  

J. Hugenschmidt 《Journal of Applied Geophysics》2000,43(2-4)

Swiss Federal Railways (SBB) inspect their railway tracks at regular intervals. The first step of track renewal planning is a geotechnical study. Inspection is focused on the thickness of the ballast, on subsoil material penetrating upwards into the ballast and on geotechnical properties of subgrade and subsoil materials. Up to now, the inspection has been done mainly by digging trenches at evenly spaced intervals and in locations of special interest. In order to evaluate the benefits and limits of GPR railway track inspections, three GPR surveys were carried out on three different railway lines. Data were acquired using a mobile system travelling at 10 km/h. Subsequent to radar data acquisition, trenches were dug. The positioning of some of the trench locations was based on preliminary GPR results in order to support the interpretation of GPR data. Only those trenches were available during interpretation of radar data. In addition, SBB performed their usual investigation programme. This provided an opportunity for checking the radar results in great detail.  相似文献