A model for the structural dynamic response of the CX‐100 wind turbine blade

Abstract

A geometrically exact beam model for simulating the structural dynamic response of the CX-100 wind turbine blade is presented. The underlying geometrically nonlinear theory is detailed, and its implementation into a finite-element code, NLBeam, developed as part of this research is outlined. The parameters used to represent the varying cross-sectional distributions of stiffness and mass are calculated consistent with the geometrically exact beam theory by using the variational asymptotic method, as developed by Hodges and Yu et al. through the commercially available code, (VABS) variational asymptotic beam sectional analysis. Code and calculation verification are documented through a systematic grid convergence study applied independently to both the cross-sectional, and static and dynamic beam simulations. An initial assessment of the model is made by comparing simulation results with experimental test data for three cases: quasistatic loading, linearized modal dynamic behavior and steady-state oscillating dynamic loads. Simulation results are shown to be in reasonable agreement with experimental data. Future improvements to the model, as well as additional experimental characterization that can benefit such modeling efforts, are outlined.

Feasibility study on a strain based deflection monitoring system for wind turbine blades

“…The analytical solution of the equation of motion of the beam is given as Eq. (9). Where λ ω = ( ) ρ r A EI r 4 2 .…”

“…And a three bladed wind turbine vibration is examined to determine the presence of cracks using accelerometers [8]. Fleming et al [9] calculated the parameters of the blade model to know the structural dynamic response of the blade.…”

A Corotational Formulation Based on Hamilton’s Principle for Geometrically Nonlinear Thin and Thick Planar Beams and Frames

“…No wonder, new applications need to be treated like the analysis of flexible hoses in the offshore industry [23], highly flexible deployable structures which are used in architecture and civil engineering [24], functionally graded structures [25], and flexible aircraft [26,27]. Additionally, in applications like large wind turbine blades, the structural geometric nonlinearity may affect the aerodynamic loading [28,29]. Consequently, the module for structural geometric nonlinearity has to be coupled with plant-scale CFD simulations.…”

Development of robust and adaptive controller for blade testing machine

“…[7]. The load history could be approximated by wind turbine blade simulations [8,9]. The equivalent fatigue test load is obtained by matching the damage caused by 20-year-design load spectrum [7].…”