Coupled Blade-Hub Dynamics in Large Horizontal-Axis Wind Turbines

大型水平轴风力发电机中的叶片-轮毂耦合动力学

• 批准号: 1335177
• 负责人: Brian Feeny
• 金额: $ 26万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-15 至 2017-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1335177&HistoricalAwards=false
• 关键词: Coupled; Blade; Hub; Dynamics; Large

The goal of this project is to deepen our understanding of the dynamics of horizontal-axis wind-turbine blades, and the loads that they impart to the gearbox and bearings, ultimately to provide guidelines for wind-turbine designers to develop turbines with significantly higher reliability. A wind-blade dynamic model involves effects of rotation, cyclic excitations due to gravity and steady wind shear (producing both parametric and direct excitation), aeroelasticity, and arbitrary wind-gust excitations. This work is focused on the resonances and instabilities associated with nearly identical wind blades coupled through the hub. Such symmetric arrangements are prone to vibration localization, which increases the vibration of a single blade. This project addresses these dynamics with fundamental modeling of the blades and hub, reduced-order modeling and perturbation analysis which yields the role of parameters and mechanisms underlying critical behaviors, high fidelity simulation studies that include the imparted loads on gears and bearings, and correlation of simulated events with field observations as available from the National Renewable Energy Laboratory and Sandia. This study will provide insight to the unknown dynamic loadings that can contribute to premature wind-turbine failures. The work thus enables a more reliable and cost-effective wind-energy fleet, which in turn promotes diversification of the renewable energy supply and the reduction of greenhouse gases. Understanding of resonances, localization, and instability of coupled blades with direct and parametric cyclic and aeroelastic excitation, and the effects on dynamic loading of the gearbox, will provide improved design guidelines for wind-turbine engineers, and will also advance the field of dynamics. Results will be disseminated through journal publications, conference presentations, and wind energy meetings and workshops. A doctoral student and an undergraduate will be prepared for the wind energy workforce. The PI will conduct outreach through existing university programs for high-school students and gifted middle school students.

该项目的目标是加深我们对水平轴风力涡轮机叶片动力学及其施加给齿轮箱和轴承的载荷的理解，最终为风力涡轮机设计人员开发可靠性显着提高的涡轮机提供指导。 风叶动力学模型涉及旋转效应、重力和稳定风切变（产生参数激励和直接激励）引起的循环激励、气动弹性和任意阵风激励。 这项工作的重点是与通过轮毂耦合的几乎相同的风力叶片相关的共振和不稳定性。 这种对称布置容易出现振动局部化，从而增加了单个叶片的振动。 该项目通过叶片和轮毂的基本建模、降阶建模和扰动分析（产生关键行为背后的参数和机制的作用）、高保真度模拟研究（包括齿轮和轴承上施加的载荷以及相关性）来解决这些动力学问题。通过国家可再生能源实验室和桑迪亚的现场观察模拟事件。 这项研究将深入了解可能导致风力涡轮机过早故障的未知动态载荷。 因此，这项工作使风能车队变得更加可靠和更具成本效益，从而促进可再生能源供应的多样化和温室气体的减少。 了解具有直接和参数循环和气动弹性激励的耦合叶片的共振、定位和不稳定性，以及对齿轮箱动态载荷的影响，将为风力涡轮机工程师提供改进的设计指南，也将推动动力学领域的发展。 研究结果将通过期刊出版物、会议演讲以及风能会议和研讨会进行传播。 一名博士生和一名本科生将为风能劳动力做好准备。 PI 将通过现有的大学项目为高中生和有天赋的中学生开展外展活动。