潜艇水下发射导弹试验用通信浮筏系统研制

本文系统介绍了新的潜艇水下发现导弹试验用通信浮筏系统及其海上的试验情况，总结了系统研制的关键技术和方法。它可用于发展其它类似的海上试验保障系统。     

应用混沌理论的舰船混响背景下目标检测方法

舰船的水下目标检测技术有重要意义,不仅关乎军事舰艇的侦察能力,还决定海上作业渔船和航运船舶的工作效率。因此,研究混响背景的水下目标信号检测技术具有重要的意义。本文系统介绍混沌理论的发展和数学模型,利用混沌理论优化舰船混响背景下的信号提取和目标检测技术,并利用仿真软件Maltlab对该目标检测技术进行仿真分析。     

涉水工程水下结构检测现状分析及展望

随着科学技术的进步,桥梁、港口、航道等涉水工程得到了大力发展。涉水工程在为经济社会发展贡献力量的同时,也面临着大量的安全威胁,尤其是水下结构的技术状况更不容忽视。本文首先对水下结构相关的检测规范进行分析,在此基础上总结归纳了目前水下结构检测常用的探摸、多波束、侧扫声纳等技术方法的适用情况及存在的弊端。基于目前的检测现状,本文针对性地分析了声纳的研究情况和前沿技术,重点介绍了三维成像声纳的基础理论和应用前景,为水下结构检测提供参考。     

3D声呐在海上风电场水下桩基和海缆检测中的应用

依托某海上风电场水下桩基和海缆检测工程,针对其验收精度高、图像获取难等问题,采用3D声呐技术对水下桩基和海缆进行扫测,获取水下桩基和海缆的三维影像.通过影像输出、软件量取、输出三维点云数据等方法,可一次性获得海缆裸露长度、桩基周围海床冲刷坑深度和桩基周围海床修复所需土石方量等数据,使海上风电场水下桩基和海缆检测的精度和...     

水下多目标跟踪技术综述

水下多目标跟踪技术在声呐探测、水中武器、水下对抗、作战监视、海上安全作业及海洋开发等领域有着重要的应用价值。本文介绍了水下多目标跟踪技术的国内外现状,总结了水下多目标跟踪中的关键技术及其发展现状和存在问题,最后还介绍了基于随机有限集的多目标跟踪新技术。     

海上风电单桩基础海缆孔失效处理方法

针对海上风电场出现溜桩导致原预留的海缆孔失效的问题，根据风场实际海况选择水下切割、水下焊接的施工工艺进行海缆孔处理，文章着重介绍方案的选择以及对方案关键技术及应用注意事项进行介绍，对类似的特殊工况处理具有参考意义。     

海上风机基础选型

海上风机基础结构是海上风电场的基本组成部分,海上风机基础结构的安全性和可靠性是海上风电场高效稳定运行的基础。海上风机基础的建造和施工在海上风电工程造价中占比接近30%,是海上风电场工程建设中除风电机组设备投资外成本占比最高的环节。根据目前已经建成项目和在建项目风机基础情况统计,重力式、单桩、导管架、水下三桩、水上三桩、高桩承台、单桶/多桶吸力桶、漂浮式等基础形式均有商业化应用,其中单桩和导管架基础形式是经济性相对较优、施工工效最高、应用比重较高的基础形式,本文对各种基础形式的特点和应用情况进行简要介绍。     

某港城护岸工程水下结构检测与评估

抛石、桩等水下结构部位的检测是护岸工程检测与评估的重点和难点。本文以某港池护岸检测评估工程为例,水下结构采用水下结构三维声纳检测等现代先进检测方法,对港池护岸工程进行了外观调查检测,在此基础上结合检测结果对护岸的安全性进行了复合验算,为掌握护岸工程性状提供了依据。本文的研究成果可为相关防波堤、护岸水下结构检测与评估提供参考。     

新型深海水下开孔机的研发与试验

水下开孔机是开展海上沉船油液回收作业的重要装备。研制了具有自主知识产权的新型深海开孔机,从总体设计原理、船板表面吸附预定位、船板自攻螺钉安装固定、船板开孔、开孔后封堵及开孔后抽油等6个方面介绍该机的工作原理,还介绍了水下无人遥控潜水器搭载水下开孔机的工作方法。重点介绍主钻机液压驱动技术。并提供了陆上功能试验、水池试验以及海上试验数据。试验结果表明这项新型深海开孔机的研制是成功的,它对今后同类开孔机的广泛应用和发展具有重要的工程意义。     

自适应抵消技术船舶综合声呐系统

船舶声呐系统利用水下的声波传播原理,可以进行水下探测、船舶通信和定位等,尤其在现代海上军事舰船的作战任务中,能发挥重要的敌军潜艇、舰船检测功能。由于特殊的水下工作环境,舰船声呐系统在采集声波信号时往往含有大量的噪声信息,影响声呐系统的信号精度。本文研究的主要内容是船舶声呐系统的噪声控制,采用自适应抵消技术和自适应滤波器技术,设计新型的船舶综合声呐系统,并对该系统的工作原理和工作流程进行了详细介绍。     

船体曲形外板成形加工的无模检验

船体曲板构件的成形检验大多采用效率较低,材耗大,手工测量为主的样板/样箱进行实体靠模检测。文章提出了一种基于GPS技术和光电原理综合运用的船体曲板成形加工的无模检验方法,该方法通过特定装置对加工成形后的船体曲板上纵、横向检测点进行空间定位和测量,并采用Matlab编程实现测量数据的自动化分析与处理, 既可用于船舶三维数控弯板机的加工检测,也可用于其他方法加工船体曲板的加工检测。     

船体结构腐蚀模型对检测及维修规划的影响

提出了基于风险的船体结构腐蚀优化检测及维修的基本理论框架.最优的检测及维修,是在保证结构在设计工作寿命内的可靠指标大于最低可靠指标的基础上,使结构生命周期内总的期望费用最小.建立了检测、维修及失效事件的安全余量方程,推导了失效及维修概率的计算公式.在此基础上,以船体结构两种常用的腐蚀模型Paik模型和Guedes Soares模型为例,分析了两种模型对最优检测及维修策略的影响.其结果表明,腐蚀模型对最优的检测及维修次数和时间有明显的影响,但是对总的期望费用及失效概率影响不大,而且两种腐蚀模型得出的最优失效概率都是10-3.     

Traffic impact analysis of inspection area site selection at a foreign trade container terminal

ABSTRACT

To improve the security and efficiency of terminal operations, a key issue for land area layout at a foreign trade container terminal is to plan and design an inspection area. Since it directly affects terminal traffic, while determining inspection area site selection, we should pay a great attention to operations and management of terminal traffic as well as container inspection. This paper employs a system decomposition technique to develop an integrated simulation framework, which enables us to flexibly obtain the whole picture of terminal traffic conditions and evaluate traffic impacts of inspection area site selection. A real-world terminal with typical patterns of land area layout is chosen to carry out a case study, which shows that traffic flow is unevenly distributed on the terminal road network and that the distribution is influenced by truck streams at the terminal. New findings also include: (1) traffic volume at the terminal apron is rather unbalanced in association with the non-continuous utilization of berths; (2) a proper inspection area should be located near the gate if the terminal conditions permit from the perspective of terminal traffic. This work may provide a decision-making reference for the planning and construction of foreign trade container terminals.     

A probabilistic damage tolerance concept for welded joints Part 2: a supplement to the rule based S–N approach

The first part of this paper presented the required statistics and stochastic models for reliability analysis of the fatigue fracture of welded plate joints. This present Part 2 suggests a probabilistic damage tolerance supplement to the design S–N curves for welded joints. The goal is to provide the practising engineer with simple tools that predict the reliability against fatigue fracture during service life. The impact of the chosen fatigue design factors (FDF) and the uncertainty in the applied stresses is revealed. The effect of an in-service inspection programme is also predicted. The results are presented as dimensionless matrices and suggested for use in support of decision-making at the design stage, without any advanced fracture mechanics modelling and stochastic simulation. One important advantage of this format is that the probability levels are presented regardless of actual weld class and target service life (TSL). This is obtained by introducing the FDF as a key parameter to the results. This parameter is defined as the ratio of predicted fatigue life over TSL. FDF is always calculated in the S–N approach which is mandatory in fatigue life prediction. Various welded details (classes) will have the same reliability level for the same FDF. This is true at the end of TSL and at earlier stages, i.e. fractions of TSL. The absolute value of TSL is immaterial for a given FDF. In the case of in-service inspection, the inspection interval is also given without dimensions as a fraction of TSL.

Only the influence of future scheduled inspections is treated. Updating based on actual inspection results is not included as the scope of work is inspection planning at the design stage. Results for some frequent cases occurring in practice are readily derived and presented.     

基于PDA的舰艇生命力电子巡检系统设计

针对舰艇航行安全保障需求，综合运用个人数字助理（Personal Digital Assistant，PDA）设计舰艇生命力电子巡检系统，开展巡检系统总体设计、巡检数据信息采集设计、管理终端设计和巡检终端设计。该系统不仅可及时有效发现舰艇事故灾害隐患，而且可归纳舰艇事故灾害规律，为舰艇航行安全的精细化和信息化管理提供有力支撑。     

地下防渗墙快速无损检测技术研究

通过对防渗墙的成墙机理与防渗墙和周围介质存在的物性差异入手，从技术背景、技术原理和适用情况等方面分析研究了适合地下防渗墙质量检测的技术。运用探地雷达、高密度电法和瑞雷面波法三种方法对分沂入沭的堤防防渗墙进行现场检测，从不同检测技术得出的资料数据分析了防渗墙存在的质量问题，并与钻孔取芯的实际检测结果比对分析。对三种探测技术进行了综合评价，得到了适合防渗墙快速无损检测的技术，即利用探地雷达和高密度电法进行防渗墙的快速无损检测，其检测的结果是有效和准确的。     

新型氯离子扩散系数检测方法的应用研究

目前对混凝土的质量检测从强度向耐久性等多面发展，在耐久性的检测中以抗氯离子渗透为主，用NEL法检测氯离子扩散系数是一种新型的且正为广大科研及检测单位所接受的检测手段，通过试验前的准备、样品的制备及试验中的注意点等几方面阐述在用此法检测时应注意的几个要点，以提高检测的精确度。     

采用自动识别系统对水下输气管线、离岸平台和船舶检验评分的实时监测（英文）

The aim of this research is to develop an algorithm and application that can perform real-time monitoring of the safety operation of offshore platforms and subsea gas pipelines as well as determine the need for ship inspection using data obtained from automatic identification system(AIS). The research also focuses on the integration of shipping database,AIS data, and others to develop a prototype for designing a real-time monitoring system of offshore platforms and pipelines. A simple concept is used in the development of this prototype, which is achieved by using an overlaying map that outlines the coordinates of the offshore platform and subsea gas pipeline with the ship's coordinates(longitude/latitude) as detected by AIS. Using such information, we can then build an early warning system(EWS) relayed through short message service(SMS), email, or other means when the ship enters the restricted and exclusion zone of platforms and pipelines. The ship inspection system is developed by combining several attributes. Then, decision analysis software is employed to prioritize the vessel's four attributes, including ship age, ship type, classification, and flag state.Results show that the EWS can increase the safety level of offshore platforms and pipelines, as well as the efficient use of patrol boats in monitoring the safety of the facilities. Meanwhile, ship inspection enables the port to prioritize the ship to be inspected in accordance with the priority ranking inspection score.     

Real-time Monitoring of Subsea Gas Pipelines,Offshore Platforms,and Ship Inspection Scores Using an Automatic Identification System

The aim of this research is to develop an algorithm and application that can perform real-time monitoring of the safety operation of offshore platforms and subsea gas pipelines as well as determine the need for ship inspection using data obtained from automatic identification system (AIS). The research also focuses on the integration of shipping database, AIS data, and others to develop a prototype for designing a real-time monitoring system of offshore platforms and pipelines. A simple concept is used in the development of this prototype, which is achieved by using an overlaying map that outlines the coordinates of the offshore platform and subsea gas pipeline with the ship’s coordinates (longitude/latitude) as detected by AIS. Using such information, we can then build an early warning system (EWS) relayed through short message service (SMS), email, or other means when the ship enters the restricted and exclusion zone of platforms and pipelines. The ship inspection system is developed by combining several attributes. Then, decision analysis software is employed to prioritize the vessel’s four attributes, including ship age, ship type, classification, and flag state. Results show that the EWS can increase the safety level of offshore platforms and pipelines, as well as the efficient use of patrol boats in monitoring the safety of the facilities. Meanwhile, ship inspection enables the port to prioritize the ship to be inspected in accordance with the priority ranking inspection score.     

自动化码头可举升自动导引车(L-AGV)箱型检测方案

目前,L-AGV开始应用到新建的集装箱自动化码头,可靠的箱型检测系统是L-AGV安全高效作业的必要保障。针对当前自动化码头L-AGV箱型检测方案误动作频率高、对装卸效率影响大的问题,结合国内主流集装箱底面结构进行研究,对当前L-AGV箱型检测逻辑进行深入分析,并提出一套全新的箱位检测思路用以替代传统箱型检测方案。结果表明,当前检测逻辑无法适应L-AGV所遇到的全部工况,且检测效率较低;本文提出的检测方案能够有效避免传统箱型检测所遇到的问题,提高了检测效率,满足码头对安全和装卸效率日益严格的要求。