Open Access

ARTICLE

Effect of Rigid Pitch Motion on Flexible Vibration Characteristics of a Wind Turbine Blade

by Zhan Wang¹, Liang Li^2,*, Long Wang¹, Weidong Zhu³, Yinghui Li⁴, Echuan Yang⁵

1 School of Mechanical Engineering, Anhui University of Science and Technology, Huainan, 232001, China
2 School of Mechanics and Optoelectronic Physics, Anhui University of Science and Technology, Huainan, 232001, China
3 Department of Mechanical Engineering, University of Maryland, Baltimore, MD 21250, USA
4 School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu, 610031, China
5 School of Mechanical Engineering, Chongqing University of Technology, Chongqing, 400054, China

* Corresponding Author: Liang Li. Email:

Energy Engineering 2024, 121(10), 2981-3000. https://doi.org/10.32604/ee.2024.048161

Received 29 November 2023; Accepted 24 July 2024; Issue published 11 September 2024

Abstract

A dynamic pitch strategy is usually adopted to improve the aerodynamic performance of the blade of a wind turbine. The dynamic pitch motion will affect the linear vibration characteristics of the blade. However, these influences have not been studied in previous research. In this paper, the influences of the rigid pitch motion on the linear vibration characteristics of a wind turbine blade are studied. The blade is described as a rotating cantilever beam with an inherent coupled rigid-flexible vibration, where the rigid pitch motion introduces a parametrically excited vibration to the beam. Partial differential equations governing the nonlinear coupled pitch-bend vibration are proposed using the generalized Hamiltonian principle. Natural vibration characteristics of the inherent coupled rigid-flexible system are analyzed based on the combination of the assumed modes method and the multi-scales method. Effects of static pitch angle, rotating speed, and characteristics of harmonic pitch motion on flexible natural frequencies and mode shapes are discussed. It shows that the pitch amplitude has a dramatic influence on the natural frequencies of the blade, while the effects of pitch frequency and pith phase on natural frequencies are little.

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