Abstract
Modern wind turbine blades are being tested for certification purposes in accordance to the IEC-64100 standard. Part 23 of the norm details the requirements for the full scale structural testing of rotor blades. As a minimum, it requires measurement of the first and second flap wise and first edge wise natural frequencies. It lists damping and mode shapes as other blade properties which may be of interest and optionally measured. The paper presents the modal model parameters estimation based on the experimental modal analysis. In two tests performed, the input force has been introduced through impact hammer and two electrodynamic shakers excitation. Several first modes had been identified for both excitation methods, including first torsional mode of the investigated blade. Results of the modal tests can be used to (a) provide more detailed information about the structural dynamics characteristics of the blade and (b) improve the design by adjusting the dynamic properties of the blade to some desired condition.
Highlights
Wind turbine blades certification [1] demands full scale structural tests for determining the blade properties
Presented research has been focused on assessment of the different excitation techniques applied for experimental modal testing of the same blade
Modal model parameter values estimation has been conducted based on the experimental datasets collected within both tests
Summary
Wind turbine blades certification [1] demands full scale structural tests for determining the blade properties. To identify the best experimental setup, the measurement campaign was designed to excite the structure with both modal hammer and shakers. The hardware selected for this test included a pair of electrodynamic shakers rated at 100N with amplifiers and a modal sledge hammer weighting 1kg with a soft tip to ensure a good excitation between 3 and 150 Hz. The hardware selected for this test included a pair of electrodynamic shakers rated at 100N with amplifiers and a modal sledge hammer weighting 1kg with a soft tip to ensure a good excitation between 3 and 150 Hz Both connections between the shakers and the blade were instrumented with a load cell to accurately measure the applied force; for impact testing, the force sensor embedded in the hammer was used. Application of the electrical and optical sensors has provided useful insights about the feasibility of the optical technology application for the wind turbine blade applications
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