【作者】 张福林；

【导师】 闫宏生；

【作者基本信息】 天津大学 ， 船舶与海洋工程（专业学位）， 2017， 硕士

【摘要】 深水铺管船是海底油气管道铺设的主力装备,其作业结构安全性问题不容忽视。作为深水铺管作业辅助装备,托管架长期处于海上恶劣风浪环境条件下,所受载荷形式极其复杂,其故障特征和失效机理主要表现为瞬时的高应力和长期性的疲劳破坏,但是目前对于托管架结构安全检测仍以人工巡检为主,缺乏大型铺管船托管架结构作业动态监测与预警技术。近年来结构健康监测技术不断发展,现已成熟应用于桥梁、隧道、船舶以及海洋平台等结构物的健康监测中,但面向铺管船托管架结构健康监测技术的应用研究仍处于空白状态。在此研究背景下,本文以某铺管船为例,研究开发了一套适用于铺管船托管架的结构作业动态监测及预警系统,实现了对托管架结构健康实时和科学的监测。本文首先对监测预警系统进行了总体设计研究,明确了监测预警系统总体设计原则,开展了监测点位选取研究、建立了监测预警系统总体框架。然后通过理论研究和SESAM软件仿真计算,对监测预警系统功能模块进行了设计研究,创新性地提出了依据现有监测点应力推算非测点应力的计算方法。结合海上现场监测条件,研究设计了监测预警系统现场实施方案,并对监测预警系统软件进行了现场测试,测试结果表明监测预警系统软件运行稳定、计算准确。最后,在监测点位实测数据的基础上进行了时域分析和频谱分析,时域分析表明:托管架上下弦杆为承受主应力构件,托管架结构应力状态受铺设张力影响,且作业过程中存在着托辊不均与接触现象;频谱分析确定了有效频带范围,区分了不同频率下的动态力成分。更多还原

【Abstract】 Deepwater pipelay vessel is the main equipment of laying oil and gas submarine pipelines,and its structure safety can not be neglected.As the assistant equipment of vessel,the stinger is endured complicated loads under long-term wind and sea environment and the failure features are mainly transient high stress and long-term fatigue damage.At present,the inspection for stinger structure is still based on manual inspection and lacks the dynamic monitoring and early warning technique.In recent years,the structural health monitoring technique has been developed and maturely applied to structure of bridges,tunnels,ships and offshore platforms.However,the application research of structural health monitoring technique for stinger is still in the blank.On this background,this paper takes a deepwater pipelay vessel as an example to research and develop a set of structural dynamic monitoring and early warning system.It realizes real-time and scientific monitoring and early warning for stinger structure.In this paper,the overall design of the monitoring and early warning system is studied,the design principle of the system is defined,the selection of monitoring points is carried out,and the overall framework of the system is established.Then through the theoretical research and simulation calculation by SESAM software,the system function module is designed and researched,the calculation method reckoning non-measuring point stress based on the existing monitoring point stress is innovative proposed.Combined with the monitoring conditions at sea,the implementation plan of system is designed.The system software is tested,the test results shows that the system software is stable and accurate.Finally,time-domain analysis and spectrum analysis are studied on the basis of measured data of monitoring points.Time-domain analysis shows that the upper and lower chords of the stinger are the main stress members,the stress state of stinger is affected by laying tension,the phenomenon for roller uneven contacting is existed.Spectrum analysis determines the effective frequency range,distinguishes the dynamic force components of different frequencies.更多还原