海洋平臺原型監(jiān)測與系泊結構模態(tài)分析
發(fā)布時間：2018-11-03 08:34
【摘要】：海洋平臺作為海上石油開采和相關工作人員生產(chǎn)生活的場所,對開采作業(yè)順利進行,確保工作人員的人身安全起著關鍵作用。海洋平臺是大型的海洋工程結構,所處的環(huán)境極其復雜,對海洋平臺的研究多通過理論分析、實驗室模型試驗和數(shù)值計算來展開,在這些研究中,結構的外部荷載都是可控的,實施起來較為容易,但是也會與現(xiàn)實的情況有所偏差,得到的結果并以一定能與現(xiàn)實情況很好地吻合。通過對海洋平臺原型測量,實現(xiàn)實時的現(xiàn)場監(jiān)測,獲得第一手的原型監(jiān)測數(shù)據(jù)對海洋平臺的相關研究和設計評價有著重要意義。為了適應不同的海洋環(huán)境已經(jīng)有多種型號的海洋平臺被設計出來,本文針對其中的兩種類型平臺的不同結構,研究了適用于它們的不同的原型監(jiān)測技術,并設計出了不同的現(xiàn)場監(jiān)測方案,開發(fā)了配套的實時監(jiān)測系統(tǒng),獲得了有關海洋平臺結構、姿態(tài)和所處環(huán)境的長期的現(xiàn)場監(jiān)測數(shù)據(jù),驗證了這些原型測量技術的可實施性和有效性。本文以渤海某型FPSO平臺的長期現(xiàn)場監(jiān)測數(shù)據(jù)為基礎,分段提取了FPSO的運動姿態(tài)和環(huán)境荷載等時間序列的多個統(tǒng)計量,給出了不同監(jiān)測量在時域或頻域上的統(tǒng)計特征和分布。通過對統(tǒng)計結果的進一步分析,發(fā)現(xiàn)了FPSO運動的周期性規(guī)律和環(huán)境荷載的一些分布特征,以及FPSO軟剛臂系泊系統(tǒng)運動的周期性和對稱性,并初步揭示了相對風向和FPSO艏向變化之間的關系。系泊系統(tǒng)作為海洋平臺的定位裝置對限制海洋平臺的運動范圍,確保海洋平臺的安全生產(chǎn)有著重要意義,本文針對海洋平臺結構監(jiān)測中數(shù)據(jù)的非平穩(wěn)性,提出一種基于非平穩(wěn)響應數(shù)據(jù)構造結構自由響應信號的方法。該方法以單邊滑動平均為基礎將多自由度結構動力方程中的荷載和響應數(shù)據(jù)平穩(wěn)化,分析了各階滑動平均的頻譜特征,研究了其階數(shù)g=1(即差分)和g1的濾波效果,并應用隨機減量技術構造出結構的自由振動方程。通過對二階線性系統(tǒng)仿真模型的識別,給出了各種情況下所識別的模態(tài)參數(shù)與理論值的比較,說明這種方法用于非平穩(wěn)響應數(shù)據(jù)的分析具有很好的效果。最后,將該方法應用在海洋平臺FPSO單點系泊結構監(jiān)測數(shù)據(jù)的模態(tài)識別中,分析了在不同時間段的單點系泊系統(tǒng)模態(tài)的分布情況,并對比分析了不同g識別出來的模態(tài)參數(shù)。
[Abstract]:The offshore platform, as a place for the production and living of offshore oil exploration and related staff, plays a key role in the smooth progress of the mining operation and in ensuring the personal safety of the staff. The offshore platform is a large offshore engineering structure, and its environment is extremely complex. The research on the offshore platform is carried out through theoretical analysis, laboratory model test and numerical calculation. In these studies, the external load of the structure is controllable. It is easy to carry out, but it will deviate from the actual situation, and the result is sure to be in good agreement with the reality. It is of great significance for the research and design evaluation of offshore platform to obtain the first-hand prototype monitoring data by measuring the prototype of the offshore platform and realizing the real-time on-site monitoring. In order to adapt to different marine environment, many kinds of offshore platforms have been designed. Different on-site monitoring schemes are designed, and a matching real-time monitoring system is developed. The long-term monitoring data about the structure, attitude and environment of the offshore platform are obtained. The feasibility and effectiveness of these prototype measurement techniques are verified. Based on the long-term field monitoring data of a certain FPSO platform in Bohai Sea, this paper extracts several statistics of time series such as motion attitude and environmental load of FPSO, and gives the statistical characteristics and distribution of different monitoring quantities in time domain or frequency domain. Through the further analysis of the statistical results, the periodicity of FPSO motion and some distribution characteristics of environmental load, as well as the periodicity and symmetry of FPSO soft rigid arm mooring system are found. The relationship between relative wind direction and FPSO heading change is also revealed. As the positioning device of offshore platform, mooring system plays an important role in limiting the moving range of offshore platform and ensuring the safe production of offshore platform. This paper aims at the non-stationarity of data in offshore platform structure monitoring. This paper presents a method of constructing structural free response signals based on nonstationary response data. In this method, the load and response data in the dynamic equations of multi-degree-of-freedom structures are stabilized on the basis of one-sided moving average. The spectral characteristics of each order moving average are analyzed, and the filtering effects of the order gn1 (difference) and G1 are studied. The free vibration equation of the structure is constructed by using the random decrement technique. Through the recognition of the simulation model of the second order linear system, the comparison between the modal parameters and the theoretical values is given. It is shown that this method is effective in the analysis of the non-stationary response data. Finally, the method is applied to the modal identification of FPSO single point mooring structure monitoring data of offshore platform. The modal distribution of single point mooring system in different time periods is analyzed, and the modal parameters identified by different g are compared.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE95;TP274
本文編號：2307265
[Abstract]:The offshore platform, as a place for the production and living of offshore oil exploration and related staff, plays a key role in the smooth progress of the mining operation and in ensuring the personal safety of the staff. The offshore platform is a large offshore engineering structure, and its environment is extremely complex. The research on the offshore platform is carried out through theoretical analysis, laboratory model test and numerical calculation. In these studies, the external load of the structure is controllable. It is easy to carry out, but it will deviate from the actual situation, and the result is sure to be in good agreement with the reality. It is of great significance for the research and design evaluation of offshore platform to obtain the first-hand prototype monitoring data by measuring the prototype of the offshore platform and realizing the real-time on-site monitoring. In order to adapt to different marine environment, many kinds of offshore platforms have been designed. Different on-site monitoring schemes are designed, and a matching real-time monitoring system is developed. The long-term monitoring data about the structure, attitude and environment of the offshore platform are obtained. The feasibility and effectiveness of these prototype measurement techniques are verified. Based on the long-term field monitoring data of a certain FPSO platform in Bohai Sea, this paper extracts several statistics of time series such as motion attitude and environmental load of FPSO, and gives the statistical characteristics and distribution of different monitoring quantities in time domain or frequency domain. Through the further analysis of the statistical results, the periodicity of FPSO motion and some distribution characteristics of environmental load, as well as the periodicity and symmetry of FPSO soft rigid arm mooring system are found. The relationship between relative wind direction and FPSO heading change is also revealed. As the positioning device of offshore platform, mooring system plays an important role in limiting the moving range of offshore platform and ensuring the safe production of offshore platform. This paper aims at the non-stationarity of data in offshore platform structure monitoring. This paper presents a method of constructing structural free response signals based on nonstationary response data. In this method, the load and response data in the dynamic equations of multi-degree-of-freedom structures are stabilized on the basis of one-sided moving average. The spectral characteristics of each order moving average are analyzed, and the filtering effects of the order gn1 (difference) and G1 are studied. The free vibration equation of the structure is constructed by using the random decrement technique. Through the recognition of the simulation model of the second order linear system, the comparison between the modal parameters and the theoretical values is given. It is shown that this method is effective in the analysis of the non-stationary response data. Finally, the method is applied to the modal identification of FPSO single point mooring structure monitoring data of offshore platform. The modal distribution of single point mooring system in different time periods is analyzed, and the modal parameters identified by different g are compared.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE95;TP274
【參考文獻】
相關期刊論文 前2條
1 歐進萍,肖儀清,黃虎杰,段忠東,張濤,李維星;海洋平臺結構實時安全監(jiān)測系統(tǒng)[J];海洋工程;2001年02期
2 肖龍飛,楊建民,王敏聲,姚美旺;淺水浮式生產(chǎn)儲油輪運動固有周期特性[J];上海交通大學學報;2005年05期
相關碩士學位論文 前1條
1 李淑一;淺水軟鋼臂系泊FPSO水動力性能和運動響應數(shù)值研究[D];中國海洋大學;2011年
，本文編號：2307265
本文鏈接：http://www.lk138.cn/kejilunwen/shiyounenyuanlunwen/2307265.html
教材專著
