Effective Methods for Structural Health Monitoring of Critical Zones of Scalable Wind Turbine Blades

doi:10.5545/sv-jme.2017.5130

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2020

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“…However, new blade designs cause greater sensitivity to dynamic excitations, which reduce wind turbine life span and efficiency, and increased vibrations and large deflections; these cause a high level of rotor instability [2]. Furthermore, the blades are usually subject to random and complex mechanical stresses [3].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Instability of a Wind Turbine Blade Due to Large Deflections: An Experimental Validation

Lopez-Lopez

Robles-Ocampo

Sevilla-Camacho

et al. 2020

SV-JME

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Wind turbine blades are designed to be thin and flexible elements. Because unstable dynamic behaviour can affect the life of the rotor, it is crucial to understand the instability of non-linear behaviour caused by large deflections. The present study undertakes both a stability analysis of the non-linear response and an experimental validation of a simplified model for a wind turbine blade based on a cantilever beam. The model is formulated taking into account large geometric deflections and assuming a Galerkin approach. The model is validated experimentally in a wind tunnel with aluminium beams of differing geometry. Analysis of the dynamic response using phase planes reveals that the degree of instability is related to the amplitude of the excitation and the stiffness characteristics.

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Section: Introductionmentioning

confidence: 99%