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ASME 2019 2nd International Offshore Wind Technical Conference最新文献

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Physical Model Testing of the TetraSpar Demo Floating Wind Turbine Prototype TetraSpar浮动式风力涡轮机样机的物理模型测试
Pub Date : 2019-12-13 DOI: 10.1115/iowtc2019-7561
Mitchell G. Borg, A. Viselli, C. Allen, M. Fowler, Christoffer Sigshøj, Andrea Grech La Rosa, M. T. Andersen, H. Stiesdal
As part of the process of deploying new floating offshore wind turbines, scale model testing is carried out to de-risk and verify the design of novel foundation concepts. This paper describes the testing of a 1:43 Froude-scaled model of the TetraSpar Demo floating wind turbine prototype that shall be installed at the Metcentre test facility, Norway. The TetraSpar floating foundation concept consists of a floater tetrahedral structure comprising of braces connected together through pinned connections, and a triangular keel structure suspended below the floater by six suspension lines. A description of the experimental setup and program at the Alfond W2 Ocean Engineering Lab at University of Maine is given. The objective of the test campaign was to validate the initial design, and contribute to the development of the final demonstrator design and numerical models. The nonlinear hydrodynamic characteristics of the design are illustrated experimentally and the keel suspension system is shown to satisfy design criteria.
作为部署新型浮式海上风力涡轮机过程的一部分,进行了比例模型试验,以降低风险并验证新基础概念的设计。本文描述了将安装在挪威Metcentre测试设施的TetraSpar Demo浮动风力涡轮机原型机的1:43弗劳德比例模型的测试。TetraSpar浮式基础概念包括一个浮式四面体结构,由通过固定连接连接在一起的支撑组成,以及一个三角形龙骨结构,通过六条悬挂线悬挂在浮式基础下方。介绍了美国缅因大学Alfond W2海洋工程实验室的实验装置和程序。测试活动的目的是验证初始设计,并促进最终演示设计和数值模型的发展。实验结果表明,龙骨悬吊系统的非线性水动力特性满足设计要求。
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引用次数: 6
Modelling the Aerodynamics of a Floating Wind Turbine Model Using a CFD-Based Actuator Disc Method 基于cfd驱动盘法的浮式风力机空气动力学建模
Pub Date : 2019-12-13 DOI: 10.1115/iowtc2019-7526
Ryan Bezzina, T. Sant, D. Micallef
Significant research in the field of Floating Offshore Wind Turbine (FOWT) rotor aerodynamics has been documented in literature, including validated aerodynamic models based on Blade Element Momentum (BEM) and vortex methods, amongst others. However, the effects of platform induced motions on the turbine wake development downstream of the rotor plane or any research related to such areas is rather limited. The aims of this paper are two-fold. Initially, results from a CFD-based Actuator Disc (AD) code for a fixed (non-surging) rotor are compared with those obtained from a Blade Element Momentum (BEM) theory, as well as previously conducted experimental work. Furthermore, the paper also emphasises the effect of tip speed ratio (TSR) on the rotor efficiency. This is followed by the analysis of floating wind turbines specifically in relation to surge displacement, through an AD technique implemented in CFD software, ANSYS Fluent®. The approach couples the Blade Element Theory (BET) for estimating rotating blade loads with a Navier Stokes solver to simulate the turbine wake. With regards to the floating wind turbine cases, the code was slightly altered such that BET was done in a transient manner i.e. following sinusoidal behaviour of waves. The AD simulations were performed for several conditions of TSRs and surge frequencies, at a constant amplitude. Similar to the fixed rotor analysis, significant parameters including thrust and power coefficients, amongst others, were studied against time and surge position. The floating platform data extracted from the AD approach was compared to the non-surging turbine data obtained, to display platform motion effects clearly. Data from hot wire near wake measurements and other simulation methods were also consulted.
浮式海上风力发电机(FOWT)转子空气动力学领域的重要研究已被文献记载,包括基于叶片元动量(BEM)和涡方法的有效空气动力学模型等。然而,平台诱导运动对旋翼平面下游涡轮尾迹发展的影响以及与此相关的研究相当有限。本文的目的是双重的。首先,将基于cfd的致动盘(AD)代码的结果与叶片单元动量(BEM)理论的结果以及先前进行的实验工作进行了比较。此外,本文还强调了叶尖速比(TSR)对转子效率的影响。随后,通过CFD软件ANSYS Fluent®中实现的AD技术,对浮动式风力涡轮机进行了分析,特别是与浪涌位移相关的分析。该方法将叶片单元理论(BET)与Navier - Stokes求解器相结合,用于估算叶片旋转载荷,模拟涡轮尾迹。关于浮动风力涡轮机的情况,代码略有改变,使BET以瞬态方式完成,即遵循波的正弦行为。在恒定振幅下,对几种tsr和浪涌频率条件进行了AD模拟。与固定转子分析类似,推力和功率系数等重要参数随时间和喘振位置的变化进行了研究。将AD方法提取的浮动平台数据与获得的无喘振涡轮数据进行对比,清晰地显示平台运动效果。还参考了热丝近尾迹测量和其他模拟方法的数据。
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引用次数: 2
Research on Underwater Vehicle for Monitoring of Offshore Wind Generation Systems 用于海上风力发电系统监测的水下航行器研究
Pub Date : 2019-12-13 DOI: 10.1115/iowtc2019-7506
I. Yamamoto, Akihiro Morinaga, M. Lawn
A compact low cost lightweight ROV (Remotely operated underwater vehicle) has been developed to assist in the monitoring of offshore wind generation systems. The ROV successfully dove 76 meters to check the condition of the spa to the base and associated moorings of a floating offshore wind generator (Goto, Nagasaki, Japan). An abundance of sea life was also observed around the base as the base provides a kind of artificial reef which fosters a marine ecosystem. The design philosophy of this ROV and overall system are described in this paper including the proposed addition of robotic arms.
一种小型、低成本、轻量化的遥控水下航行器(ROV)被开发出来,用于辅助海上风力发电系统的监测。ROV成功下潜76米,检查了spa到基地和浮式海上风力发电机的相关系泊处的状况(日本长崎后藤)。基地周围也有丰富的海洋生物,因为基地提供了一种人工珊瑚礁,培育了海洋生态系统。本文描述了该ROV的设计理念和整个系统,包括提议增加机械臂。
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引用次数: 0
WindCrete Fatigue Verification 风干混凝土疲劳验证
Pub Date : 2019-12-13 DOI: 10.1115/iowtc2019-7564
P. Trubat, J. Bairán, A. Yagüe, C. Molins
WindCrete is an offshore concrete spar type platform for Wind Turbines developed at Universitat Politècnica de Catalunya – BarcelonaTech. The main characteristics of the platform are its monolithic configuration and the use of concrete as main material. The monolithic nature allows avoiding joints between the substructure and the tower increasing the service life of the structure. The use of concrete increases the resistance when exposed to an offshore environment but requires ensuring a full compression state along the structure to avoid cracking. Thus, the platform is post-tensioned by longitudinal tendons along its length. Adequate fatigue design is a key factor to ensure the reliability of offshore structures. Floating Offshore Wind Turbines are subjected to cyclic phenomena coming from waves, wind, rotor-induced vibrations and structural vibrations. These loads have to be considered in order to assess the fatigue life of offshore structures. Furthermore, pre-stressed concrete adds an internal load such that it avoids the presence of tension stresses at any given section, which has a positive influence on the fatigue response of the structure by increasing its fatigue resistance. An excess of compression can, however, also induce an adverse effect on the fatigue resistance of the concrete. In order to study the fatigue behaviour of WindCrete when fitted with a 5MW Wind Turbine, a Fatigue Limit State verification is performed according to the DNVGL-ST-0437 for load cases definition and FIB Model Code (2010) for fatigue structural verification. The location chosen to install WindCrete is the Gulf de Lion, at the west of the Mediteranian Sea off the coast of Catalunya with a mean wind speed above 9 m/s. The metocean conditions for design purpose are presented, which are obtained from available environmental data. A total of 458 simulation cases are performed using the NREL FAST software assuming wind and wave co-directionally, and quasi-static mooring response for Parked and Power-Production operational modes. Assuming an elastic response of the tower, the internal stresses at the tower base are obtained for all the simulations. Then, a fatigue analysis is performed at the tower base through a cumulative damage approach based on the Palmgren-Miner rule. The analysis accounted for the multiaxial stresses produced by the combination of axial, bending and tangential forces. The S-N material curves were defined according to the Model Code 2010 method, which accounts for the effect of the stress range as well as the average stress.
WindCrete是一种用于风力涡轮机的海上混凝土梁式平台,由加泰罗尼亚政治大学-巴塞罗那科技公司开发。该平台的主要特点是其整体结构和使用混凝土作为主要材料。整体特性允许避免下部结构和塔之间的连接,增加结构的使用寿命。当暴露在海上环境中时,混凝土的使用增加了阻力,但需要确保结构处于完全压缩状态,以避免开裂。因此,平台沿其长度通过纵向筋进行后张。充分的疲劳设计是保证海上结构可靠性的关键因素。浮式海上风力涡轮机受到来自波浪、风、转子振动和结构振动的循环现象的影响。为了评估海上结构的疲劳寿命,必须考虑这些载荷。此外,预应力混凝土增加了内部荷载,从而避免了任何给定截面上的拉应力的存在,这通过增加其抗疲劳性对结构的疲劳响应产生了积极影响。然而,过大的压缩也会对混凝土的抗疲劳性能产生不利影响。为了研究WindCrete在安装5MW风力涡轮机时的疲劳行为,根据DNVGL-ST-0437的载荷情况定义和FIB模型规范(2010)的疲劳结构验证,进行了疲劳极限状态验证。安装WindCrete的地点选择在地中海西部加泰罗尼亚海岸附近的海湾,平均风速在9米/秒以上。根据现有的环境资料,给出了设计所需的海洋气象条件。使用NREL FAST软件进行了458个模拟案例,假设风和波共向,以及停泊和发电操作模式下的准静态系泊响应。假设塔身有弹性响应,得到了塔身的内应力。然后,通过基于Palmgren-Miner规则的累积损伤方法对塔基进行疲劳分析。该分析考虑了轴向力、弯曲力和切向力共同作用产生的多轴应力。S-N材料曲线根据2010年《模型规范》定义,考虑了应力范围和平均应力的影响。
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引用次数: 1
A Modified Free-Wake Vortex Ring Model for the Aerodynamics of Floating Offshore Wind Turbines 浮动式海上风力机空气动力学的修正自由尾迹涡环模型
Pub Date : 2019-12-13 DOI: 10.1115/iowtc2019-7610
Jing Dong, A. Viré, Simao Ferreira, Zhang-rui Li, G. V. Bussel
A modified free-wake vortex ring model is proposed to compute the dynamics of a floating horizontal-axis wind turbine. The model is divided into two parts. The near wake model uses a blade bound vortex model and trailed vortex model, which is developed based on vortex filament method. By contrast, the far wake model is based on the vortex ring method. This is a good compromise between accuracy and computational cost. In this work, the model is used to assess the influence of floating platform motions on the performance of a horizontal-axis wind turbine rotor. The results are validated on the 5MW NREL rotor and compared with other vortex models for the same rotor subjected to different platform motions. It was found that the result from the proposed method are more reliable than the results from BEM theory especially at small angles of attack in the region of low wind speeds, on the one hand, and high wind speeds with blade pitch motions, on the other hand.
提出了一种改进的自由尾迹涡环模型来计算浮动水平轴风力机的动力学。该模型分为两部分。近尾迹模型采用叶片束缚涡模型和基于涡丝法建立的尾涡模型。而远尾迹模型则是基于涡环法。这是精度和计算成本之间的一个很好的折衷。在这项工作中,该模型用于评估浮动平台运动对水平轴风力发电机转子性能的影响。在5MW NREL转子上进行了验证,并与不同平台运动下相同转子的其他涡模型进行了比较。结果表明,该方法的计算结果比边界元理论的计算结果更可靠,特别是在低风速区域的小迎角和高风速区域的桨距运动下。
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引用次数: 0
Simulation of an Offshore Wind Turbine Using a Weakly-Compressible CFD Solver Coupled With a Blade Element Turbine Model 基于弱可压缩CFD求解器与叶片单元涡轮模型耦合的海上风力机仿真
Pub Date : 2019-12-13 DOI: 10.1115/iowtc2019-7600
B. Elie, G. Oger, D. L. Touzé
The present study addresses the first steps of development and validation of a coupled CFD-BE (Blade Element) simulation tool dedicated to offshore wind turbine farm modelling. The CFD part is performed using a weakly-compressible solver (WCCH). The turbine is taken into account using FAST (from NREL) and its effects are imposed into the fluid domain through an actuator line model. The first part of this paper is dedicated to the presentation of the WCCH solver and its coupling with the aero-elastic modules from FAST. In a second part, for validation purposes, comparisons between FAST and the WCCH-FAST coupling are presented and discussed. Finally, a discussion on the performances, advantages and limitations of the formulation proposed is provided.
本研究解决了用于海上风力涡轮机建模的耦合CFD-BE(叶片元件)仿真工具的开发和验证的第一步。CFD部分使用弱可压缩求解器(WCCH)执行。使用FAST(来自NREL)考虑涡轮,并通过执行器线模型将其影响施加到流体域。本文第一部分介绍了WCCH求解器及其与FAST气动弹性模块的耦合。在第二部分,为了验证的目的,提出并讨论了FAST和WCCH-FAST耦合之间的比较。最后,对所提出的配方的性能、优点和局限性进行了讨论。
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引用次数: 0
Hybrid Model Tests for Floating Offshore Wind Turbines 浮式海上风力涡轮机混合模型试验
Pub Date : 2019-12-13 DOI: 10.1115/iowtc2019-7575
M. Thys, A. Fontanella, F. Taruffi, M. Belloli, Petter A. Berthelsen
Model testing of offshore structures has been standard practice over the years and is often recommended in guidelines and required in certification rules. The standard objectives for model testing are final concept verification, where it is recommended to model the system as closely as possible, and numerical code calibration. Model testing of floating offshore wind turbines is complex due to the response depending on the aero-hydro-servo-elastic system, but also due to difficulties to perform model tests in a hydrodynamic facility with correctly scaled hydrodynamic, aerodynamic and inertial loads. The main limitations are due to the Froude-Reynolds scaling incompatibility, and the wind generation. An approach to solve these issues is by use of hybrid testing where the system is divided in a numerical and a physical substructure, interacting in real-time with each other. Depending on the objectives of the model tests, parts of a physical model of a FOWT can then be placed in a wind tunnel or an ocean basin, where the rest of the system is simulated. In the EU H2020 LIFES50+ project, hybrid model tests were performed in the wind tunnel at Politecnico di Milano, as well as in the ocean basin at SINTEF Ocean. The model tests in the wind tunnel were performed with a physical wind turbine positioned on top of a 6DOF position-controlled actuator, while the hydrodynamic loads and the motions of the support structure were simulated in real-time. For the tests in the ocean basin, a physical floater with tower subject to waves and current was used, while the simulated rotor loads were applied on the model by use of a force actuation system. The tests in both facilities are compared and recommendations on how to combine testing methodologies in an optimal way are discussed.
多年来,海上结构的模型测试一直是标准做法,经常在指南中被推荐,并在认证规则中被要求。模型测试的标准目标是最终概念验证,建议尽可能接近系统模型,以及数字代码校准。浮式海上风力发电机的模型试验非常复杂,因为其响应依赖于气动-液压-伺服-弹性系统,而且在具有正确比例的水动力、气动和惯性载荷的水动力设施中进行模型试验也很困难。主要的限制是由于弗劳德-雷诺兹尺度不相容和风的产生。解决这些问题的一种方法是使用混合测试,将系统分为数值子结构和物理子结构,并相互实时交互。根据模型测试的目的,可以将FOWT物理模型的一部分放置在风洞或海洋盆地中,在那里对系统的其余部分进行模拟。在EU H2020 LIFES50+项目中,在米兰理工大学的风洞以及SINTEF ocean的海洋盆地中进行了混合模型测试。在风洞中进行了模型试验,在6DOF位置控制作动器顶部放置了一个物理风力机,同时实时模拟了支撑结构的水动力载荷和运动。在海盆试验中,采用带塔的物理浮子进行波浪和水流作用试验,同时采用力致动系统对模型施加模拟转子载荷。对两种设备的测试进行了比较,并讨论了如何以最佳方式组合测试方法的建议。
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引用次数: 6
Effect of Nacelle Drag on the Performance of a Floating Wind Turbine Platform 吊舱阻力对浮式风力机平台性能的影响
Pub Date : 2019-12-13 DOI: 10.1115/iowtc2019-7595
Daewoong Son, Pauline Louazel, Bingbin Yu
Wind forces acting on an offshore wind turbine are transferred to the bottom of the tower and consequently to the floating structure. Thus, drag forces acting on each component of the wind turbine such as the blades, the nacelle, and the tower must be accounted for properly in order to evaluate the performance of the supporting platform. In the aero-elastic wind turbine simulation tool FAST v.7, the nacelle drag component, however, has not been implemented, which means that only the drag forces on the tower and on the blades are represented. In this work, the front and side nacelle drag forces are modelled in FAST v.7 via different drag contributions. This paper will examine the behavior of a floating offshore semisubmersible platform, the WindFloat, for different Rotor-Nacelle-Assembly (RNA) yaw-misalignments with emphasis on the nacelle drag component.
作用在海上风力涡轮机上的风力被转移到塔的底部,从而转移到浮动结构。因此,为了评估支撑平台的性能,必须适当地考虑作用于风力涡轮机的每个部件(如叶片、机舱和塔)上的阻力。然而,在气动弹性风力机仿真工具FAST v.7中,没有实现机舱阻力分量,这意味着只表示塔架和叶片上的阻力。在这项工作中,通过不同的阻力贡献,在FAST v.7中模拟了前和侧短舱阻力。本文将研究海上浮式半潜式平台WindFloat在不同转子-机舱组件(RNA)偏航失调情况下的行为,重点研究机舱阻力组件。
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引用次数: 0
Integrating Compressed Air Energy Storage (CAES) in Floating Offshore Wind Turbines 将压缩空气储能(CAES)集成到浮式海上风力涡轮机中
Pub Date : 2019-12-13 DOI: 10.1115/iowtc2019-7533
Peter P. Vella, T. Sant, R. Farrugia
The design of an offshore energy storage system carries unknowns which need to be studied at an early stage of the project to avoid unnecessary costs of failures. These risks have led to an increasing dependence on more sophisticated mathematical models. This paper refers specifically to energy storage in the offshore wind farming industry and has the objective of proposing an adiabatic compressed air energy (A-CAES) system which would be integrated on a semi-submersible offshore wind turbine (OWT) platform. Calculations in respect to the sizing of the main sub-components of the system are included and estimates for the overall round trip efficiency are presented. Preliminary calculations to size the various parts of the energy storage system (ESS) have been carried out based on the energy availability of an offshore 8 MW wind turbine with real wind data from the North Sea. The load data to determine the lowest 12-hour demand period was taken from the Nordpool database. The calculations of the proposed conceptual design are based on an operational scenario in which the 24-hour period of a particular day is split in a 12-hour charging and 12-hour discharging cycle. For charging, a 5-bank, 2-stage compressor train is used to pressurize a number of steel cylindrical vessels with compressed air. This is followed by a process in which the compressed air is discharged across 12 hours using a 2-bank, 2-stage expander turbine. The multiple compression banks enable a modular power delivery to the air storage vessels, with the number of compressors utilized varying subject to wind availability. The two stages allowed for the air to be cooled in between the stages using heat exchangers, transferring the heat of compression to a pressurized sea water circuit. The hot water would be stored in thermally insulated vessels at 350°C to heat the inlet expanding air in the discharge period. A 70 and 100 Bar charging scenarios, both with a cushion pressure (CP) in the air storage vessel (ASV) of 10 Bar at the end of the discharge cycle have been considered. Standard performance criteria are calculated such as compression and expansion ratios, inlet and outlet temperatures for the respective expansion and compression air streams and flow rates within the heat exchangers to come up with an indicative sizing proposal for the respective turbo machinery and storage vessels making up the system. Round trip efficiencies are also calculated. The study determined that a CAES system consisting of 9 compressed air storage vessels operating with a peak pressure of 100 Bar should meet the storage requirements. It is also estimated that the entire CAES system would require around 1082 m2 of deck area on the platform to accommodate the pressure vessels, the compressor and expander trains, the heat exchanger and the hot water storage vessel.
海上储能系统的设计存在未知因素,需要在项目的早期阶段进行研究,以避免不必要的故障成本。这些风险导致越来越依赖于更复杂的数学模型。本文专门针对海上风电场行业的储能问题,提出了一种将集成在半潜式海上风力发电机(OWT)平台上的绝热压缩空气能源(a - caes)系统。对系统主要子部件的尺寸进行了计算,并提出了总体往返效率的估计。对储能系统(ESS)各部分的尺寸进行了初步计算,计算的基础是一台海上8兆瓦风力涡轮机的能源可用性,并获得了来自北海的真实风力数据。用于确定最低12小时需求期的负载数据取自Nordpool数据库。拟议概念设计的计算是基于一个操作方案,其中某一天的24小时周期分为12小时充电和12小时放电周期。充注时,一个5排、2级压缩机组被用来用压缩空气对一些钢圆柱形容器加压。这是随后的一个过程中,压缩空气排放跨越12小时使用2银行,2级膨胀涡轮机。多个压缩库可实现向空气储存容器的模块化电力输送,所使用的压缩机数量根据风力的可用性而变化。这两个阶段允许空气在使用热交换器之间冷却,将压缩的热量传递给加压的海水回路。热水将储存在350°C的隔热容器中,以在排放期间加热进口膨胀空气。考虑了70 Bar和100 Bar的充电方案,在放电循环结束时,空气储存容器(ASV)中的缓冲压力(CP)均为10 Bar。计算标准性能标准,例如压缩和膨胀比,各自膨胀和压缩气流的入口和出口温度以及热交换器内的流速,以提出组成系统的各自涡轮机械和存储容器的指示性尺寸建议。还计算了往返效率。研究确定,由9个压缩空气储存容器组成的CAES系统,在100巴的峰值压力下运行,应符合储存要求。据估计,整个CAES系统将需要平台上大约1082平方米的甲板面积来容纳压力容器、压缩机和膨胀器、热交换器和热水储存容器。
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引用次数: 0
Damping Identification of the TetraSpar Floater in Two Configurations With Operational Modal Analysis 基于运行模态分析的TetraSpar浮子两种构型阻尼辨识
Pub Date : 2019-12-13 DOI: 10.1115/iowtc2019-7623
A. Pegalajar-Jurado, Freddy J. Madsen, H. Bredmose
Second-order hydrodynamic loads can induce motions at the natural frequencies of a floating wind turbine. These resonant responses are highly dependent on the hydrodynamic damping, which is mostly introduced by viscous effects. Numerically, these viscous effects are often represented by a Morison drag term with relative velocity, which introduces forcing, sea state-dependent linear damping and amplitude-dependent quadratic damping. Recent literature shows that calibration of the Morison drag coefficients to decay tests is not sufficient to achieve an accurate response in the numerical models. In addition, calibration of the drag coefficient alone changes both forcing and damping. Hence, following common practice, additional damping terms are needed, which require calibration against operating conditions. In this study, we apply Operational Modal Analysis (OMA) to wave basin results for the TetraSpar floater of Stiesdal Offshore Technologies. The floater was tested at scale 1:60 with the DTU 10MW reference wind turbine, both in the semi and spar configurations. We identify the linearized damping ratio in surge and pitch for different environmental conditions and investigate its dependency on the sea state and the motion amplitude. Our preliminary results show that the damping of the pitch mode follows increasing trends with significant wave height and motion amplitude, whereas the damping in surge presents a less clear tendency. This is linked to the larger damping level, smaller natural frequency and larger OMA uncertainty for surge. The paper concludes with a discussion of the dependency of OMA estimates on the amount of data and its processing.
二阶流体动力载荷可以在浮动风力涡轮机的固有频率下引起运动。这些共振响应高度依赖于流体动力阻尼,而流体动力阻尼主要是由粘性效应引入的。在数值上,这些粘性效应通常由具有相对速度的莫里森阻力项表示,其中引入了强迫、与海况相关的线性阻尼和与幅值相关的二次阻尼。最近的文献表明,校正莫里森阻力系数的衰减试验是不够的,以达到准确的响应在数值模型。此外,仅校正阻力系数就会改变力和阻尼。因此,按照通常的做法,需要额外的阻尼项,这需要根据操作条件进行校准。在这项研究中,我们将操作模态分析(OMA)应用于Stiesdal Offshore Technologies公司的TetraSpar浮子的波盆结果。该浮子以1:60的比例与DTU 10MW参考风力涡轮机进行了测试,包括半桅杆和桅杆构型。我们确定了不同环境条件下浪涌和俯仰的线性化阻尼比,并研究了其与海况和运动幅值的关系。初步结果表明,随着波高和运动幅值的显著增加,俯仰模态的阻尼呈增加趋势,而浪涌模态的阻尼呈不太明显的趋势。这与较大的阻尼水平、较小的固有频率和较大的浪涌OMA不确定性有关。本文最后讨论了OMA估计对数据量及其处理的依赖性。
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引用次数: 5
期刊
ASME 2019 2nd International Offshore Wind Technical Conference
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