近海单桩风机在波浪与地震联合作用下的动力响应
发布时间：2018-07-15 15:33
【摘要】：近年来,随着风能被越来越多地开发利用,海上风力发电进入了快速发展时期。与陆地风力发电不同,海上风力发电机会受到风荷载、波浪荷载、海流荷载、海冰荷载和潮汐等作用,有时还会受到地震荷载的威胁,因此,海上风机所处的环境更为恶劣。地震活跃地区的海上风机很有可能受到强震和中等强度波浪的联合作用,目前,针对海上风电机在波浪和地震联合作用下结构响应的研究很少,基于实验室的模型试验研究更几乎没有。本文以NREL-5MW近海单桩风机为原型,进行了以下理论分析和试验研究：(1)叙述了单自由度系统、多自由度系统的地震响应理论,并详细介绍了地震工程反应谱法和时域数值积分方法,为研究海上风机地震响应提供理论依据。(2)介绍了海洋工程领域常用的波浪理论及各自适用范围；基于莫里森公式,介绍了小尺度结构物波浪力的计算方法,为海上风机在波浪作用下的动力分析提供理论基础；同时,针对刚性和柔性小尺度结构物,建立了其在波浪和地震联合作用下的运动方程,研究了两者的联合作用机理。(3)研究了在结构动力模型试验中常用的相似理论,并利用几何相似理论和弹性力-重力相似理论,设计制造了NREL-5MW近海单桩风机1：30缩尺模型,根据强震和中等海况的原则选取试验工况组合,进行了近海单桩风机在地震、波浪及二者联合作用下结构动力响应的模型试验,并采集加速度、位移和应力数据。(4)重点研究了强震、中等强度波浪及其联合作用下的加速度响应,基于反应谱理论研究了结构在不同激励下的动力放大特性。试验结果表明,由于波浪和地震之间存在耦合作用,两者联合作用时的结构响应并不等同于两者分别单独作用时的线性叠加：考虑波浪和地震的联合作用对于正确估计结构响应是非常重要的,进行地震分析时忽略波浪的影响,结构响应将偏于非保守。(5)作为对模型试验结果的验证和补充,本文基于ANSYS有限元分析软件建立了近海单桩风机数值模型,并对其进行了在波浪、地震及其联合作用时的动力分析,与模型试验结果进行对比。
[Abstract]:In recent years, with the development and utilization of wind energy, offshore wind power generation has entered a period of rapid development. Different from terrestrial wind power generation, offshore wind turbines are subjected to wind load, wave load, current load, sea ice load and tide, and sometimes to seismic load, so the environment of offshore wind turbine is even worse. Offshore fans in seismically active areas are likely to be subjected to the combined action of strong and medium intensity waves. At present, there is little research on the structural response of offshore wind motors under the combined action of waves and earthquakes. Laboratory-based model test studies are almost non-existent. Taking NREL-5MW offshore single pile fan as prototype, the following theoretical analysis and experimental research are carried out: (1) the seismic response theory of single-degree of freedom system and multi-degree of freedom system is described. The seismic engineering response spectrum method and time-domain numerical integration method are introduced in detail, which provides a theoretical basis for the study of seismic response of offshore fans. (2) the wave theory commonly used in the field of marine engineering and their respective application ranges are introduced, based on Morrison formula, The calculation method of wave force for small scale structures is introduced, which provides a theoretical basis for the dynamic analysis of offshore fans under the action of waves, at the same time, for rigid and flexible small scale structures, The equation of motion under the combined action of wave and earthquake is established, and the mechanism of the joint action is studied. (3) the similarity theory commonly used in the structural dynamic model test is studied, and the geometric similarity theory and the elastic force-gravity similarity theory are used. The 1:30 scale model of NREL-5MW offshore single pile fan is designed and manufactured. According to the principle of strong earthquake and medium sea condition, the model test of structural dynamic response of offshore single pile fan under the action of earthquake, wave and the combination of them is carried out according to the principle of strong earthquake and medium sea condition. The acceleration, displacement and stress data are collected. (4) the acceleration response of strong and medium intensity waves and their combined actions are studied. The dynamic amplification characteristics of structures under different excitations are studied based on the response spectrum theory. The experimental results show that due to the coupling between waves and earthquakes, The structural response under the combined action is not equal to the linear superposition when the two act separately. It is very important to consider the combined action of wave and earthquake to estimate the structural response correctly, and the influence of wave is ignored in seismic analysis. The structural response will be unconservative. (5) in order to verify and supplement the results of the model test, the numerical model of offshore single-pile fan is established based on ANSYS finite element analysis software, and the wave is carried out. The dynamic analysis of the earthquake and its combined action is compared with the results of the model test.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU311.3;TM315
本文编号：2124549
[Abstract]:In recent years, with the development and utilization of wind energy, offshore wind power generation has entered a period of rapid development. Different from terrestrial wind power generation, offshore wind turbines are subjected to wind load, wave load, current load, sea ice load and tide, and sometimes to seismic load, so the environment of offshore wind turbine is even worse. Offshore fans in seismically active areas are likely to be subjected to the combined action of strong and medium intensity waves. At present, there is little research on the structural response of offshore wind motors under the combined action of waves and earthquakes. Laboratory-based model test studies are almost non-existent. Taking NREL-5MW offshore single pile fan as prototype, the following theoretical analysis and experimental research are carried out: (1) the seismic response theory of single-degree of freedom system and multi-degree of freedom system is described. The seismic engineering response spectrum method and time-domain numerical integration method are introduced in detail, which provides a theoretical basis for the study of seismic response of offshore fans. (2) the wave theory commonly used in the field of marine engineering and their respective application ranges are introduced, based on Morrison formula, The calculation method of wave force for small scale structures is introduced, which provides a theoretical basis for the dynamic analysis of offshore fans under the action of waves, at the same time, for rigid and flexible small scale structures, The equation of motion under the combined action of wave and earthquake is established, and the mechanism of the joint action is studied. (3) the similarity theory commonly used in the structural dynamic model test is studied, and the geometric similarity theory and the elastic force-gravity similarity theory are used. The 1:30 scale model of NREL-5MW offshore single pile fan is designed and manufactured. According to the principle of strong earthquake and medium sea condition, the model test of structural dynamic response of offshore single pile fan under the action of earthquake, wave and the combination of them is carried out according to the principle of strong earthquake and medium sea condition. The acceleration, displacement and stress data are collected. (4) the acceleration response of strong and medium intensity waves and their combined actions are studied. The dynamic amplification characteristics of structures under different excitations are studied based on the response spectrum theory. The experimental results show that due to the coupling between waves and earthquakes, The structural response under the combined action is not equal to the linear superposition when the two act separately. It is very important to consider the combined action of wave and earthquake to estimate the structural response correctly, and the influence of wave is ignored in seismic analysis. The structural response will be unconservative. (5) in order to verify and supplement the results of the model test, the numerical model of offshore single-pile fan is established based on ANSYS finite element analysis software, and the wave is carried out. The dynamic analysis of the earthquake and its combined action is compared with the results of the model test.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU311.3;TM315
【参考文献】
相关期刊论文 前3条
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