考虑塔影效应的微型风力发电机转子动力学降阶分析模型。

IF 3.9 2区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Aly A Ramzy, Adel Elsabbagh, Ashraf M Hamed, Ahmed A Barakat
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引用次数: 0

摘要

10千瓦以下的微型风力涡轮机(μWTs)比大型风力涡轮机遭受更高的振动水平。这可以归因于它们以更高的转速旋转的事实。为了简单起见,叶片直接连接到外转子型的永磁发电机(PMG)上,无需安装齿轮箱。此外,由于它们的小尺寸,尾叶片代表了一种经济有效的解决方案,使涡轮机与风向对齐。由于风向的不可预测的变化,这些尾翼产生了显著的偏航率。高偏航率,随着增加的旋转速度,产生相当大的陀螺仪负载。因此μWTs具有独特的动态加载条件。考虑到现有的软件包主要是为大型风力涡轮机设计的,因此对μWTs的动力学进行彻底的研究是必要的。在这项研究中,我们使用一个简单的数学模型来解决μWTs的动力学特性,这有助于提供比数值计算更好的动力学见解。利用数学模型对发电机的轴承跨度和转子重心沿转子轴的位置两个参数进行了参数化研究。参数化研究表明,增大轴承座跨度可减小振动。此外,将转子的重心移向发电机的后轴承可以减少所有考虑自由度的振动,除了转子的垂直振动和俯仰,它们达到最小值。计算了重心的最佳位置,并用于改进现有μWT的设计。一个案例研究强调了在均方根振动方面的改进。该模型可以帮助设计人员更好地理解设计参数的动态影响,从而构建性能更好、寿命更长的μ wt。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Reduced order analytical modelling of micro wind turbine rotordynamics with tower shadow effects.

Reduced order analytical modelling of micro wind turbine rotordynamics with tower shadow effects.

Reduced order analytical modelling of micro wind turbine rotordynamics with tower shadow effects.

Reduced order analytical modelling of micro wind turbine rotordynamics with tower shadow effects.

Micro scale wind turbines (μWTs) in the order of 10 kW or less, suffer high vibration levels compared to larger ones. This can be attributed to the fact that they rotate at higher rotational speeds. For simplicity, blades are directly attached to a permanent magnet generator (PMG) of an outer rotor type with no need to install a gearbox. Also due to their small size, a tail vane represents a cost-effective solution for aligning the turbine with the wind direction. Those tail vanes generate significant yaw rates as a consequence of the unpredictable variations in wind direction. High yaw rates, along with increased rotational speeds, generate considerable gyroscopic loads. Therefore, μWTs involve a unique dynamic loading condition. Considering that the existing software packages are primarily designed for large wind turbines, a thorough investigation into the dynamics of μWTs is essential. In this study, we address the peculiarity of dynamics of μWTs using a simple mathematical model that helps in providing better dynamical insights than numerical calculations. Using the mathematical model, a parametric study is conducted involving two parameters: the generator's bearing span and the position of the rotor's centre of gravity (CG) along the rotor axis. The parametric study revealed that increasing the bearing span yields a decrease in vibrations. Also, shifting the centre of gravity of the rotor towards the generator's rear bearing reduces vibrations across all considered degrees of freedom, except for the rotor's vertical vibrations and pitching, which achieve a minimum value. An optimal placement of the centre of gravity is calculated and used afterwards to improve the design of an existing μWT. A case study highlights this improvement in terms of root mean square vibrations. The presented model can thereby help designers to build μWTs with better performance and longer lifespan offering a better understanding of the dynamical effects of design parameters.

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来源期刊
Scientific Reports
Scientific Reports Natural Science Disciplines-
CiteScore
7.50
自引率
4.30%
发文量
19567
审稿时长
3.9 months
期刊介绍: We publish original research from all areas of the natural sciences, psychology, medicine and engineering. You can learn more about what we publish by browsing our specific scientific subject areas below or explore Scientific Reports by browsing all articles and collections. Scientific Reports has a 2-year impact factor: 4.380 (2021), and is the 6th most-cited journal in the world, with more than 540,000 citations in 2020 (Clarivate Analytics, 2021). •Engineering Engineering covers all aspects of engineering, technology, and applied science. It plays a crucial role in the development of technologies to address some of the world''s biggest challenges, helping to save lives and improve the way we live. •Physical sciences Physical sciences are those academic disciplines that aim to uncover the underlying laws of nature — often written in the language of mathematics. It is a collective term for areas of study including astronomy, chemistry, materials science and physics. •Earth and environmental sciences Earth and environmental sciences cover all aspects of Earth and planetary science and broadly encompass solid Earth processes, surface and atmospheric dynamics, Earth system history, climate and climate change, marine and freshwater systems, and ecology. It also considers the interactions between humans and these systems. •Biological sciences Biological sciences encompass all the divisions of natural sciences examining various aspects of vital processes. The concept includes anatomy, physiology, cell biology, biochemistry and biophysics, and covers all organisms from microorganisms, animals to plants. •Health sciences The health sciences study health, disease and healthcare. This field of study aims to develop knowledge, interventions and technology for use in healthcare to improve the treatment of patients.
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