Modelling the aeroelastic response of slender structures to vortex-induced vibrations: Industry transfer through full-scale experimental campaign at a wind turbine

模拟细长结构对涡激振动的气动弹性响应：通过风力涡轮机的全面实验活动实现产业转移

• 批准号: 493357786
• 负责人: Professor Dr.-Ing. Rüdiger Höffer
• 金额: --
• 依托单位: Siemens Gamesa Renewable Energy GmbH & Co. KG
• 依托单位国家: 德国
• 项目类别: Research Grants (Transfer Project)
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/493357786?language=en
• 关键词: Modelling; aeroelastic; response; slender; structures

In this project, wind, force and structural response measurements are carried out in field tests on a wind turbine and the developed aeroelastic model according to the preceding proposal is transferred to the natural scale. During vortex excitation of slender structures, an aeroelastic interaction occurs in the lock-in region. In research, it is modelled as negative aeroelastic damping. This approach has been taken up by preceding proposal and implemented in a fundamental vortex excitation model. The modelling has been accompanied by wind tunnel experiments. Through experimental verification, theoretical deficits in the modelling of the maximum oscillation amplitude can be eliminated and the stress oscillations that are decisive for the design-relevant fatigue processes can be predicted much more realistically and transparently than was previously possible. In this transfer project, it is planned to carry out field measurements on the prototype of the 155 m high wind turbine SG14 as part of the cooperation with the application partner Siemens Gamesa Renewable Energy. The prototype is located at the Østerild wind turbine test field in Denmark. The following quantities will be measured: 1) wind speed profile and wind direction using a meteorological mast, 2) wind pressures at the tower of the wind turbine with 15° angular spacing at each of the two levels, from which wind forces can be integrated, 3) accelerations along the height and 4) strains of the tower wall to determine bending moments at the base and at hub height. The research aims at transferring the concept of aeroelastic modelling in vortex-induced vibrations developed in the preceding project to the reality of transcritical Reynolds numbers, multiple eigenmodes of the structure and realistic turbulent inflow profiles. The reliable determination of the modal parameters (natural frequencies, natural modes and damping ratios) of the structure is thereby co-decisive in order to be able to realistically predict the vortex-induced vibrations when using the developed aeroelastic model. The solution of the inverse problem of system identification is determined on the basis of the response measurements and with the help of Operational Modal Analysis. Furthermore, the distinguished feature at the base of this project is to complement the characterisation of the structural response by an in-depth investigation of the wind forces obtained from simultaneous pressure measurements on the tower surface. As a result, the investigations enable the development of a concept for an industry standard for the response calculation of chimneys, towers, masts and other slender structures that are sensitive to vortex-induced vibrations.

在该项目中，在风力涡轮机的现场试验中进行风、力和结构响应测量，并将根据前述建议开发的气动弹性模型转换为自然尺度。在细长结构的涡激振动过程中，在锁定区会发生气动弹性干扰。在研究中，它被建模为负气动弹性阻尼。这种方法已经被前面的建议所采用，并在基本的涡激模型中实现。模型已经伴随着风洞实验。通过实验验证，可以消除最大振幅建模中的理论缺陷，并且可以比以前更真实、更透明地预测对设计相关疲劳过程具有决定性作用的应力振荡。在该转让项目中，计划对155米高的风力涡轮机SG 14原型进行现场测量，作为与应用合作伙伴西门子歌美飒可再生能源合作的一部分。样机位于丹麦的风力涡轮机试验场。将测量以下数量：1）风速剖面和风向（使用气象桅杆），2）风力涡轮机塔架处的风压（两个高度上的角间距为15°），风力可通过该风压积分，3）沿着高度的加速度，以及4）塔架壁的应变，以确定基座和轮毂高度处的弯矩。该研究旨在将前一项目中开发的涡致振动气动弹性建模概念转化为跨临界雷诺数、结构的多个本征模态和真实湍流入流剖面的现实。因此，结构模态参数（固有频率、固有模态和阻尼比）的可靠确定是共同决定性的，以便在使用开发的气动弹性模型时能够真实地预测涡激振动。系统识别的逆问题的解决方案是确定的基础上的响应测量和操作模态分析的帮助下。此外，该项目的突出特点是通过对风荷载的深入研究来补充结构响应的特征，风荷载是从塔架表面的同时压力测量中获得的。因此，调查使一个概念的发展，为烟囱，塔，桅杆和其他细长结构的响应计算的行业标准是敏感的涡激振动。