海洋浮动式激光雷达测风装置初步研究
发布时间：2019-06-13 19:18
【摘要】：近年来为推动海上风能的有效利用,海上风场的建立越来越受到人们的重视。激光雷达因其探测精度与空间分辨率高、测量范围远等特点,已成为当前测量海上风场的最有效手段之一。目前,激光雷达大多安装在固定桩柱上进行测风研究,随着水深增加桩柱成本急剧增大,不利于长期发展。而浮动式激光雷达测风装置,因其制造成本低、布置方便以及污染小等优点,已经越来越被人们所关注。本文自主设计了浮动式激光雷达测风装置,并基于三维势流理论的SESAM软件对其水动力性能展开了研究。论文的主要研究内容及结论如下:(1)在大量调研各类型仪器的基础上,通过对比分析,选择了安装简便、测风精度高的激光雷达以及相关配套设备,保证激光雷达能够在海上进行长期的测风研究。(2)通过研究国内外相关文献和工程实例,利用SESAM软件进行数值模拟分析,确定了浮动式激光雷达测风装置的结构型式、详细尺寸以及相关设备布置方案,有效降低激光雷达工作时波浪对其测风精度影响。分析可知:对于浮动式激光雷达测风装置内部仪器的布置而言,将其靠近中垂线布置时,能够有效地提高浮动式激光雷达测风装置的无因次衰减系数,从而降低整个系统的运动响应幅值,但是浮动式激光雷达测风装置的固有周期也会随着减小,可能对其工作产生不利影响。(3)应用SESAM软件的HydroD/Wadam模块开展了浮动式激光雷达测风装置的频域计算工作,得到不同波浪入射角、不同水深时的水动力系数。同时,进一步考虑了粘性阻尼对浮动式激光雷达测风装置横摇以及纵摇运动的影响。结果表明:浮动式激光雷达测风装置的运动性能与水深变化无关,其横摇与纵摇运动固有周期约为2s,适合布放在长周期海域,而垂荡运动则具有良好的随波运动特性。此外,在进行浮动式激光雷达测风装置运动响应预报时,建议考虑粘性阻尼作用,否则计算结果偏大。(4)依据不同的工作水深,为浮动式激光雷达测风装置设计了两种系泊系统,分别是:全锚链系泊系统和三段式系泊系统,并应用SESAM软件的DeepC模块对浮动式激光雷达测风装置及其系泊系统进行时域计算分析,验证可行性。其结果表明:当浮动式激光雷达测风装置采用全锚链系泊系统时,想要控制其运动响应和锚链张力,应着重控制浮动式激光雷达测风装置的波频运动成分。而采用三段式系泊系统时,则既需要控制浮动式激光雷达测风装置波频运动成分还需要重点考虑低频运动成分。(5)根据相似理论,确定模型参数,通过模型规则波试验验证浮动式激光雷达测风装置的数值理论结果。
[Abstract]:In recent years, in order to promote the effective utilization of offshore wind energy, the establishment of offshore wind field has been paid more and more attention. Lidar has become one of the most effective means to measure offshore wind field because of its high detection accuracy, spatial resolution and long measurement range. At present, lidar is mostly installed on fixed piles for wind measurement research. with the increase of water depth, the cost of piles increases sharply, which is not conducive to long-term development. Floating lidar wind measuring device has been paid more and more attention because of its low manufacturing cost, convenient arrangement and low pollution. In this paper, a floating lidar wind measuring device is designed independently, and its hydrodynamic performance is studied based on SESAM software of three-dimensional potential flow theory. The main research contents and conclusions of this paper are as follows: (1) on the basis of a large number of investigation and analysis of various types of instruments, through comparative analysis, the lidar with simple installation and high accuracy of wind measurement and related supporting equipment is selected to ensure that lidar can carry out long-term wind measurement research at sea. (2) by studying the relevant literature and engineering examples at home and abroad, the numerical simulation analysis is carried out by using SESAM software. The structure type, detailed size and arrangement scheme of the floating lidar wind measuring device are determined, which can effectively reduce the influence of the wave on the wind measuring accuracy of the lidar when it works. The analysis shows that for the arrangement of the internal instruments of the floating lidar wind measuring device, when it is close to the vertical line, the dimensionless attenuation coefficient of the floating lidar wind measuring device can be effectively improved, thus reducing the amplitude of the motion response of the whole system, but the inherent period of the floating lidar wind measuring device will also decrease. It may have adverse effects on its work. (3) the frequency domain calculation of floating lidar wind measuring device is carried out by using the HydroD/Wadam module of SESAM software, and the hydrodynamic coefficients of different wave incident angles and different water depths are obtained. At the same time, the influence of viscous damping on rolling and pitching motion of floating lidar wind measuring device is further considered. The results show that the motion performance of the floating lidar wind measuring device has nothing to do with the change of water depth. The inherent period of rolling and pitching motion is about 2s, which is suitable for distribution in the long period sea area, while the drooping motion has good wave motion characteristics. In addition, when predicting the motion response of floating lidar wind measuring device, it is suggested that viscous damping should be considered, otherwise the calculation results are too large. (4) according to different working water depths, two kinds of mooring systems are designed for floating lidar wind measuring device, namely, full anchor chain mooring system and three-stage mooring system. The DeepC module of SESAM software is used to calculate and analyze the floating lidar wind measuring device and its mooring system in time domain, and the feasibility is verified. The results show that when the full anchor chain mooring system is used in the floating lidar wind measuring device, in order to control its motion response and anchor chain tension, the wave frequency motion components of the floating lidar wind measuring device should be controlled. When the three-stage mooring system is used, it is not only necessary to control the wave frequency motion components of the floating lidar wind measuring device, but also to consider the low frequency motion components. (5) according to the similarity theory, the model parameters are determined, and the numerical theoretical results of the floating lidar wind measuring device are verified by the model regular wave test.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN958.98
本文编号：2498754
[Abstract]:In recent years, in order to promote the effective utilization of offshore wind energy, the establishment of offshore wind field has been paid more and more attention. Lidar has become one of the most effective means to measure offshore wind field because of its high detection accuracy, spatial resolution and long measurement range. At present, lidar is mostly installed on fixed piles for wind measurement research. with the increase of water depth, the cost of piles increases sharply, which is not conducive to long-term development. Floating lidar wind measuring device has been paid more and more attention because of its low manufacturing cost, convenient arrangement and low pollution. In this paper, a floating lidar wind measuring device is designed independently, and its hydrodynamic performance is studied based on SESAM software of three-dimensional potential flow theory. The main research contents and conclusions of this paper are as follows: (1) on the basis of a large number of investigation and analysis of various types of instruments, through comparative analysis, the lidar with simple installation and high accuracy of wind measurement and related supporting equipment is selected to ensure that lidar can carry out long-term wind measurement research at sea. (2) by studying the relevant literature and engineering examples at home and abroad, the numerical simulation analysis is carried out by using SESAM software. The structure type, detailed size and arrangement scheme of the floating lidar wind measuring device are determined, which can effectively reduce the influence of the wave on the wind measuring accuracy of the lidar when it works. The analysis shows that for the arrangement of the internal instruments of the floating lidar wind measuring device, when it is close to the vertical line, the dimensionless attenuation coefficient of the floating lidar wind measuring device can be effectively improved, thus reducing the amplitude of the motion response of the whole system, but the inherent period of the floating lidar wind measuring device will also decrease. It may have adverse effects on its work. (3) the frequency domain calculation of floating lidar wind measuring device is carried out by using the HydroD/Wadam module of SESAM software, and the hydrodynamic coefficients of different wave incident angles and different water depths are obtained. At the same time, the influence of viscous damping on rolling and pitching motion of floating lidar wind measuring device is further considered. The results show that the motion performance of the floating lidar wind measuring device has nothing to do with the change of water depth. The inherent period of rolling and pitching motion is about 2s, which is suitable for distribution in the long period sea area, while the drooping motion has good wave motion characteristics. In addition, when predicting the motion response of floating lidar wind measuring device, it is suggested that viscous damping should be considered, otherwise the calculation results are too large. (4) according to different working water depths, two kinds of mooring systems are designed for floating lidar wind measuring device, namely, full anchor chain mooring system and three-stage mooring system. The DeepC module of SESAM software is used to calculate and analyze the floating lidar wind measuring device and its mooring system in time domain, and the feasibility is verified. The results show that when the full anchor chain mooring system is used in the floating lidar wind measuring device, in order to control its motion response and anchor chain tension, the wave frequency motion components of the floating lidar wind measuring device should be controlled. When the three-stage mooring system is used, it is not only necessary to control the wave frequency motion components of the floating lidar wind measuring device, but also to consider the low frequency motion components. (5) according to the similarity theory, the model parameters are determined, and the numerical theoretical results of the floating lidar wind measuring device are verified by the model regular wave test.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN958.98
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