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Modal Parameter Identification Method of jacket platform Structure Based on AFDD and Optimized FBFFT

China Ocean Engineering 2023年第3期37卷 393-407页

作者： LENG Jian-cheng MA Jin-yong FAN Zong-heng QIAN Wan-dong FENG Hui-yu School of Mechanical Science and Engineering Northeast Petroleum UniversityDaqing 163318China

Offshore platforms are susceptible to structural damage due to prolonged exposure to random loads,such as wind,waves,and *** is particularly true for platforms that have been in service for an extended *** the modal parameters of offshore platforms is crucial for damage diagno sis,as it serves as a prerequisite and foundation for the ***,it holds great significance to prioritize the identification of these *** at the shortcomings of the traditional Fast Bayesian Fast Fourier Transform(FBFFT) method,this paper proposes a modal parameter identification method based on Automatic Frequency Domain Decomposition(AFDD) and optimized *** introducing the AFDD method and Powell optimization algorithm,this method can automatically identify the initial value of natural frequency and solve the objective function efficiently and *** order to verify the feasibility and effectiveness of the proposed method,it is used to identify the modal parameters of the IASC-ASCE benchmark model and the j acket platform structure model,and the Most Probable Value(MPV) of the modal parameters and their respective posterior uncertainties are successfully *** identification results of the IASC-ASCE benc hmark model are compared with the identification re sults of the MODE-ID method,which verifies the effectivene ss and accuracy of the proposed method for identifying modal *** provides a simple and feasible method for quantifying the influence of uncertain factors such as environmental parameters on the identification results,and also provide s a reference for modal parameter identification of other large structures.

关键词： jacket platform uncertain modal parameter identification FBFFT method environmental excitation AFDD method Powell optimization

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System Reliability Analysis of an Offshore jacket platform

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Journal of Ocean University of China 2020年第1期19卷 47-59页

作者： ZHAO Yuliang DONG Sheng JIANG Fengyuan GUEDES SOARES Carlos College of Engineering Ocean University of ChinaQingdao 266100China Centre for Marine Technology and Ocean Engineering(CENTEC Instituto Superior TécnicoLisboa 1049-001Portugal

This study investigates strategies for solving the system reliability of large three-dimensional jacket *** structural systems normally fail as a result of a series of different components *** failure characteristics are investigated under various environmental conditions and direction ***β-unzipping technique is adopted to determine critical failure components,and the entire system is simplified as a series-parallel system to approximately evaluate the structural system ***,this approach needs excessive computational effort for searching failure components and failure *** on a trained artificial neural network(ANN),which can be used to approximate the implicit limit-state function of a complicated structure,a new alternative procedure is proposed to improve the efficiency of the system reliability analysis *** failure probability is calculated through Monte Carlo simulation(MCS)with Latin hypercube sampling(LHS).The features and applicability of the above procedure are discussed and compared using an example jacket platform located in Chengdao Oilfield,Bohai Sea,*** study provides a reference for the evaluation of the system reliability of jacket structures.

关键词： system reliability jacket platform β-unzipping technique artificial neural network latin hypercube sampling response surface

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Estimating Design Loads with Environmental Contour Approach Using Copulas for an Offshore jacket platform

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Journal of Ocean University of China 2020年第5期19卷 1029-1041页

作者： ZHAO Yuliang LIU Dahui DONG Sheng College of Engineering Ocean University of ChinaQingdao 266100China CIMC Offshore Engineering Institute Co. Ltd.Yantai 264670China

jacket-type offshore platforms are widely used for oil, gas field, and energy development in shallow water. The design of a jacket structure is highly dependent on target environmental variables. This study focuses on a strategy to estimate design loads for offshore jacket structures based on an environmental contour approach. In addition to the popular conditional distribution model, various classes of bivariate copulas are adopted to construct joint distributions of environmental variables. Analytical formulations of environmental contours based on various models are presented and discussed in this study. The design loads are examined by dynamic response analysis of jacket platform. Results suggest that the conditional model is not recommended for use in estimating design loads in sampling locations due to poor fitting results. Independent copula produces conservative design loads and the extreme response obtained using the conditional model are smaller than those determined by copulas. The suitability of a model for contour construction varies with the origin of wave data. This study provides a reference for the design load estimation of jacket structures and offers an alternative procedure to determine the design criteria for offshore structures.

关键词： design loads jacket platform joint probability distribution conditional model copula theory environmental contour method

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Nonlinear Analysis of Pile Foundation jacket platform

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China Ocean Engineering 1997年第1期12卷 21-28页

作者： Xu, B Shen, ZH Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China

In this paper, the nonlinear collapse of the BOHAI-8 pile foundation jacket platform has been analyzed. The ultimate load and collapse process of two computational models of the structure are given. One model is of fixed support whose length is eight times the pile leg diameter and the other considers the nonlinearity of the soil-pile interaction.

关键词： nonlinear analysis jacket platform ultimate load platform collapse

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Research on technology of automatic welding machine and procedure for pile pipes of offshore jacket platform

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Engineering Sciences 2010年第2期8卷 24-30,43页

作者： Tang Deyu Feng Biao Li Chunrun Niu Huli Zhang Jianhu Long Bin Sun Bo Research Institute of Engineering Technology of CNPC Tianjin 300451 China

Because of the high requirement of quality,vile working environment and great difficulty of automatic welding,MMAW is usually adopted for the welding of the platform jacket and the pile *** low efficiency and hard working is one of the choke points for construction progress. In this article,an up-to-date technology for platform pile pipe welding was introduced. Cored with FCW-S and combined with the characters and requirements of platform construction,the special automatic horizontal welding equipment and process were developed. Further more,the offshore application were introduced too.

关键词： offshore jacket platform pile pipe automatic welding PLC

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Vibration Control Induced by Ice of a jacket platform

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Transactions of Tianjin University 2003年第4期9卷 326-329页

作者：郑宏宇姜大宁唐友刚周满红 School of Civil Engineering

Based on the self-excited vibration theory of ice, the vibration control technology of jacket platform is studied in this paper. The magnetorheological suspensions (MR) unit is chosen as the damper, the control objective function for vibration excited by ice is determined by instantaneous optimal control (IOC) method, and genetic algorithm (GA) is used to select the optimal control force. For the jacket platform of 40 m in height and a 3-floor deck, the vibration responses induced by ice have been calculated before and after control considering the different thickness and speed of ice. It is shown that the control method presented in this paper can reduce the vibration response by 30%, and it is feasible to adopt MR absorber and GA in the control of vibration induced by ice.

关键词： jacket platform vibration response induced by ice vibration control magnetorheological suspensions technology

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Analyzing the safety of removal sequences for piles of an offshore jacket platform

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Journal of Marine Science and Application 2009年第4期8卷 311-315页

作者：潘新颖张兆德中国海洋大学工程学院山东青岛266100 浙江海洋学院船舶与建筑工程学院浙江舟山316100

An inevitable consequence of the development of the offshore petroleum industry is the eventual obsolescence of large offshore structures. Proper methods for removal of decommissioned offshore platforms are becoming an important topic that the oil and gas industry must pay increasing attention to. While removing sections from a decommissioned jacket platform, the stability of the remaining parts is critical The jacket danger indices D ~ and Ds defined in this paper are very useful for analyzing the safety of any procedure planned for disassembling a jacket platform. The safest piles cutting sequence can be determined easily by comparing every column of Do and Ds or simply analyzing the figures of every row ofD o and D,.

关键词： jacket platform removal safety analysis stress

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Curvature of Flexibility Matrix for Damage Identification in Legs of jacket platforms

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China Ocean Engineering 2008年第4期22卷 547-559页

作者：陈立马骏赵德有邬君 Department of Naval Architecture Dalian University of Technology

In this paper a new nondestructive damage identification method is introduced. The method based on flexibility matrix can be used to detect and locate structm＇al damage and evaluate the severity of damage in legs of jacket platforms by modal parameters of a structure. With the modal data for only the few lower modes in both the intact and damaged states, the one-dimensional and two-dimensional distributed curvatures can be used to analyze damage location and the severity. Instead of directly comparing the curvatures before and ＇after damage, the method here uses modal parameters only in the damaged structure to detect the damage and it consists of three parts. First, ilexibility matrix is obtained by use of the absolute maximum in each column. Second, because the legs of jacket platforms are the pipe-like structure, the circumferential flexibility curvature matrix is obtained by use of the circular curvature. At last, equivalent curvature ratio is defined and the curve meaning equivalent curvature ratio and the severity of damage relationship for one element is given through the data of damage severity from ten percent to ninety percent by numerical simulation. Many existing damage detection methods need two steps, locate the damage firstly and evaluate the severity of the damage. However, the method present- ed! in this paper can locate and then evaluate the severity of damage at the same time. The numerical analysis results in- dicate that the present method is effective, useful and only need the first and the second mode data of the structure.

关键词： jacket platform damage detection flexibility curvature flexibility matrix

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Optimum Design of jacket platforms Considering Structure-Pile-Soil Interaction

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China Ocean Engineering 1999年第3期14卷 309-316页

作者：宋玉普封盛康海贵 State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology (DUT) Dalian 116023 China State Key Laboratory of Coastal and Offshore Engineering DUT Dalian 116023 China

This paper proposes an optimum design model for the offshore jacket platform considering multidesign criteria, multi-design constraints and the structure-pile-soil interaction, and gives an optimum design procedure in which the proposed optimum design model is used together with structural analysis software SAP91 and optimum algorithm software OPB1. The Chengbei (#)11 offshore platform, which lies in the Shengli oilfield, is designed by use of the above optimum design model. The results show that the optimum design model is stable, and it depends on neither the optimization algorithm nor initial values of design variables. All values of the objective function converge to the same minimum value, and the speed of convergence is high, showing that the proposed optimum design model is reasonable.

关键词： jacket platform optimum design structure-pile-soil interaction

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Vibration Control of jacket platforms with Magnetorheological Damper and Experimental Validation~

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High Technology Letters 2010年第2期16卷 189-193页

作者：嵇春艳 Chen Menglu Li Shanshan School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Zhenjiang 212003 P.R. China

Magnetorheological （MR） dampers have been proposed to control the vibration of offshore platforms in this paper. The semi-active control strategy based on fuzzy control algorithm was adopted to determine the optimal output control force based on the responses of jacket platforms. A typical jacket platform in Mexico Gulf was selected as the numerical example to investigate the effectiveness of the proposed control method. Furthermore, a model experiment was performed to validate the results of the numerical simulation. The experimental model of the jacket platform was designed based on dynamical similarity criterion by the scale of 1：50. Both of the numerical and experimental results show that the semi-active control system with the MR damper can reduce vibrations of jacket platforms effectively and at the same time the control effect is stable.

关键词： magnetorheological (MR) damper jacket platform semi-active control model experiment

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