海上风电机组四桩导管架支撑结构的动力响应分析

发布时间：2018-01-13 15:02

本文关键词：海上风电机组四桩导管架支撑结构的动力响应分析　出处：《中国海洋大学》2014年硕士论文　论文类型：学位论文

【摘要】：海上风力发电作为一项绿色环保产业，发展的同时也伴随着越来越多的工程实际问题。因此，对海上风力发电结构体系进行系统地环境荷载作用下的动力响应分析研究具有十分重要的参考价值和工程意义。风、浪荷载是复杂的海上环境荷载中两个重要的组成部分，当其作用在海上风电结构上时会产生比较大的影响。因而首先合理地确定海上风、浪荷载的形式及大小对准确地模拟海上风力发电结构的受力情况至关重要。在此基础上，再针对工程实际问题分析计算海上风力发电结构在环境荷载作用下的动力响应，完成海上风电结构的安全评估。本文依托珠海桂山某海域的实际工程，根据实测数据和工况条件，对海上风力发电机组四桩导管架支撑结构在风、浪荷载作用下进行动力响应分析研究。具体工作包括：首先选用Stokes五阶波理论，采用Morison公式模拟波浪海流在顺流向对支撑结构导管架部分的作用力。计算针对不同波高和流速海况下波浪以最大作用力方式作用于结构物的相位角，将结果作为用ANSYS软件对结构进行静力分析时的输入条件。求解找到结构出现最大应力部位，并观察不同相位角的取值对波流荷载作用于支撑结构的影响。之后采用线性滤波法，基于Davenport谱用MATLAB软件编程对实际研究海域的脉动风进行模拟，比较计算谱与目标谱。将脉动风速时程叠加平均风速得到瞬时风速。将80m高支撑结构塔筒部分均分为20段，利用风压转换公式把瞬时风速时程转换成作用在塔筒部分的风荷载时程。最后利用有限元法对用非线性弹簧单元模拟桩基与海底土作用关系的海上风力发电机组四桩导管架支撑结构进行模态分析；分别将风、浪荷载单独加载到支撑结构的有限元模型上，用ANSYS对结构瞬态动力分析，，比较承受两种不同荷载的支撑结构节点位移和单元应力；将风、浪荷载联合施加在支撑结构有限元模型上，经过瞬态动力计算得到支撑结构位移最大处的位移时程，以及应力最大处的应力时程，分析比较单独荷载作用下与联合荷载作用下支撑结构的动力响应。本文主要通过对风、浪荷载单独作用下支撑结构的动力响应分析，锁定结构产生位移最大部位和应力最大部位。将两种荷载作用下的结果进行比较，确定所研究海上风力发电支撑结构在当地海域的主要控制环境荷载。对风、浪荷载联合作用下的支撑结构动力分析，通过观察最大位移处的位移时程，为支撑结构在环境荷载相互耦合作用下进行动力分析提供依据，近而为海上风力发电机组四桩导管架支撑结构在复杂海洋环境荷载作用下的设计提供一些有工程应用参考价值的分析结论。
[Abstract]:Offshore wind power as a green environmental protection industry development, with more and more engineering problems. Therefore, the dynamic load response analysis under the environment of system research has very important reference value and engineering significance of offshore wind power structure.
The wind and wave loads are the two important part of complex sea environment loads, when its role in offshore wind power structure will have a relatively large impact. The first to reasonably determine the form and size of offshore wind, wave loads to accurately simulate the critical force of offshore wind power structure in this. Based on the analysis of practical engineering problems in dynamic calculation of offshore wind power structure in response to environmental loads, the completion of the safety assessment of offshore wind power structure.
In this paper, based on the actual engineering of Zhuhai Shan a sea area, according to the measured data and the working condition of the offshore wind turbine four pile jacket supporting structure in the wind, the dynamic response analysis of the effects of wave loads. The concrete work includes:
The five order Stokes wave theory, by using the Morison formula to simulate wave current when the force of supporting structure of jacket part. For the calculation of phase velocity and wave height in different sea waves to maximum force acting on the structure angle, as a result of the input conditions on the static analysis using ANSYS software solution. Find the structure of the maximum stress position, and to observe the influence of different values of phase angle of wave and current load on the support structure.
After using the linear filtering method, Davenport spectrum was simulated by the MATLAB software programming of fluctuating wind on the actual research area based on comparing the calculated spectrum and the target spectrum. The fluctuating wind speed average speed instantaneous wind speed. The 80m high tower supporting structure part is divided into 20 sections, using the pressure conversion formula of the instantaneous wind speed into effect in the wind load of tower part of the process.
Finally, using the finite element method of offshore wind turbine simulation effect of pile foundation and the seabed soil relationship by using nonlinear spring element four pile jacket supporting structure modal analysis; the wind wave load individually loaded to the support structure of the finite element model, transient dynamic analysis on the structure of ANSYS, compared with under two different loads support the nodal displacements and element stress; the wind wave load exerted on the support structure combined with finite element model, calculated after transient dynamic displacement of structure supporting the maximal displacement time history, and stress the maximum stress at the time, the support structure dynamic response analysis between single loads and joint load under the action of.
This paper mainly through the wind, the dynamic response of the structure to support the separate effects of wave load, displacement and locking structure of the largest part of the location of the maximum stress. Comparing the two kinds of loads results, determine the main control environment of offshore wind power load supporting structure in the local area. The wind, dynamic analysis of support the joint action of wave load structure, through the observation of the maximum displacement displacement time history, as the supporting structure provides the basis for dynamic analysis in environmental load coupling, and for the offshore wind turbine four pile jacket design support structure in complex loads in the marine environment, provide some reference value engineering the results of analysis.

【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM315;TU311.3

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